U.S. patent application number 15/544741 was filed with the patent office on 2018-01-04 for fluid control assemblies, and core barrel and overshot assemblies comprising same.
The applicant listed for this patent is LONGYEAR TM, INC.. Invention is credited to Christopher L. Drenth, Jeff Hogan.
Application Number | 20180003000 15/544741 |
Document ID | / |
Family ID | 56544376 |
Filed Date | 2018-01-04 |
United States Patent
Application |
20180003000 |
Kind Code |
A1 |
Drenth; Christopher L. ; et
al. |
January 4, 2018 |
FLUID CONTROL ASSEMBLIES, AND CORE BARREL AND OVERSHOT ASSEMBLIES
COMPRISING SAME
Abstract
Fluid control assemblies including at least one ring. The fluid
control assemblies are used within core barrel assemblies to:
provide an indication that a core barrel assembly has reached a
drilling position and is latched to a drill string; serve as a
mechanical shut-off valve that restricts the flow of drilling fluid
within a core barrel assembly; and/or serve as a grease seal at the
connection between an inner tube cap and an inner tube that
receives a core sample.
Inventors: |
Drenth; Christopher L.;
(Burlington, CA) ; Hogan; Jeff; (Brampton,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LONGYEAR TM, INC. |
Salt Lake City |
UT |
US |
|
|
Family ID: |
56544376 |
Appl. No.: |
15/544741 |
Filed: |
January 29, 2016 |
PCT Filed: |
January 29, 2016 |
PCT NO: |
PCT/US2016/015582 |
371 Date: |
July 19, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62110007 |
Jan 30, 2015 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21B 25/00 20130101;
E21B 33/12 20130101; E21B 25/02 20130101 |
International
Class: |
E21B 33/12 20060101
E21B033/12; E21B 25/00 20060101 E21B025/00 |
Claims
1. A fluid control assembly having a longitudinal axis, comprising:
at least one ring, each ring having inner surfaces that cooperate
to define an inner diameter of the ring and outer surfaces that
cooperate to define an outer diameter of the ring, wherein the ring
is configured for axial and radial compression and expansion
relative to the longitudinal axis; a bushing having an inner
surface that defines an inlet, an outlet, a central bore extending
between the inlet and the outlet, and at least one slot positioned
in communication with the central bore at a location between the
inlet and the outlet, wherein the at least one slot of the bushing
is configured to receive the at least one ring, wherein the at
least one slot is configured to retain the at least one ring during
axial and radial compression and expansion of the at least one
ring.
2. The fluid control assembly of claim 1, wherein the inlet of the
bushing defines a first inner diameter of the bushing, and wherein
the first inner diameter of the bushing is greater than the inner
diameter of the at least one ring.
3. The fluid control assembly of claim 2, wherein at least a
portion of the inner surface of the bushing between the inlet and
the at least one slot of the bushing is inwardly tapered relative
to the longitudinal axis of the fluid control assembly.
4. The fluid control assembly of claim 2, wherein the inner surface
of the bushing defines a recess proximate the at least one slot of
the bushing, the recess being positioned between the at least one
slot and the outlet of the bushing relative to the longitudinal
axis of the fluid control assembly.
5. The fluid control assembly of claim 4, wherein the recess is
configured to receive at least a portion of a piston.
6. The fluid control assembly of claim 3, wherein at least a
portion of the inner surface of the bushing between the at least
one slot and the outlet of the bushing is outwardly tapered
relative to the longitudinal axis of the fluid control
assembly.
7. The fluid control assembly of claim 6, wherein the tapered
portion of the inner surface between the at least one slot and the
outlet of the bushing is configured to receive at least a portion
of a valve member, wherein the valve member is selected from the
group consisting of a ball element and a valve piston.
8. The fluid control assembly of claim 2, wherein the at least one
ring is configured to circumferentially surround the longitudinal
axis of the fluid control assembly when the at least one ring is
positioned within the at least one slot of the bushing.
9. The fluid control assembly of claim 1, wherein the at least one
slot of the bushing comprises a single slot that circumferentially
surrounds the central bore of the bushing.
10. The fluid control assembly of claim 1, wherein the outer
surface of the bushing has a first portion positioned proximate the
inlet of the bushing and a second portion positioned proximate the
outlet of the bushing, wherein the first portion of the outer
surface of the bushing projects outwardly from the second portion
of the bushing relative to the longitudinal axis of the fluid
control assembly such that the first portion of the outer surface
defines opposed first and second shoulder surfaces extending
substantially perpendicularly relative to the longitudinal
axis.
11. The fluid control assembly of claim 10, wherein the first
portion of the outer surface of the bushing defines a
circumferential groove positioned between the first and second
shoulder surfaces relative to the longitudinal axis of the
bushing.
12-23. (canceled)
24. A core barrel assembly having a longitudinal axis, comprising:
an upper latch body; a lower latch body that cooperates with the
upper latch body to define an inner channel, the lower latch body
comprising a core sample tube cap and a valve body, the valve body
having an outer surface and being operatively received within the
core sample tube cap; a core sample tube operatively coupled to the
core sample tube cap of the lower latch body and positioned in
selective fluid communication with the inner channel of the lower
latch body; and a fluid control assembly comprising at least one
ring, each ring having inner surfaces that cooperate to define an
inner diameter of the ring and outer surfaces that cooperate to
define an outer diameter of the ring, wherein the ring is
configured for axial and radial compression and expansion relative
to the longitudinal axis, wherein the inner surfaces of the at
least one ring of the fluid control assembly are positioned in
circumferential engagement with the outer surface of the valve body
of the lower latch body, and wherein the fluid control assembly is
configured to permit axial movement of the core sample tube
relative to the lower latch body.
25. The core barrel assembly of claim 24, wherein the fluid control
assembly is configured to control the flow of grease within the
lower core barrel subassembly.
26. (canceled)
27. A core barrel assembly comprising: fluid control assembly
having a longitudinal axis and comprising: at least one ring, each
ring having inner surfaces that cooperate to define an inner
diameter of the ring and outer surfaces that cooperate to define an
outer diameter of the ring, wherein the ring is configured for
axial and radial compression and expansion relative to the
longitudinal axis; and a bushing having an inner surface that
defines an inlet, an outlet, a central bore extending between the
inlet and the outlet, and at least one slot positioned in
communication with the central bore at a location between the inlet
and the outlet, wherein the at least one slot of the bushing is
configured to receive the at least one ring, wherein the at least
one slot is configured to retain the at least one ring during axial
and radial compression and expansion of the at least one ring,
wherein the fluid control assembly is configured to control the
flow of fluid through at least a portion of the core barrel
assembly.
28. The core barrel assembly of claim 27, wherein the inlet of the
bushing defines a first inner diameter of the bushing, and wherein
the first inner diameter of the bushing is greater than the inner
diameter of the at least one ring.
29. The core barrel assembly of claim 28, wherein at least a
portion of the inner surface of the bushing between the inlet and
the at least one slot of the bushing is inwardly tapered relative
to the longitudinal axis of the fluid control assembly.
30. The core barrel assembly of claim 28, wherein the inner surface
of the bushing defines a recess proximate the at least one slot of
the bushing, the recess being positioned between the at least one
slot and the outlet of the bushing relative to the longitudinal
axis of the fluid control assembly.
31. The core barrel assembly of claim 30, wherein the recess is
configured to receive at least a portion of a piston.
32. The core barrel assembly of claim 30, wherein at least a
portion of the inner surface of the bushing between the at least
one slot and the outlet of the bushing is outwardly tapered
relative to the longitudinal axis of the fluid control assembly,
wherein the tapered portion of the inner surface between the at
least one slot and the outlet of the bushing is configured to
receive at least a portion of a valve member, and wherein the valve
member is selected from the group consisting of a ball element and
a valve piston.
33. The fluid control assembly of claim 29, wherein the at least
one ring is configured to circumferentially surround the
longitudinal axis of the fluid control assembly when the at least
one ring is positioned within the at least one slot of the bushing.
Description
CROSS-REFERENCE TO RELATED PATENT APPLICATION
[0001] This application claims priority to and the benefit of the
filing date of U.S. Provisional Patent Application No. 62/110,007,
filed Jan. 30, 2015, which is incorporated herein by reference in
its entirety.
FIELD
[0002] This invention relates generally to drilling devices and
methods that may be used to drill geological and/or manmade
formations. In particular, the invention relates to fluid control
assemblies used during drilling operations and core barrel
assemblies and overshot assemblies incorporating such fluid control
assemblies.
BACKGROUND
[0003] It is known to use mechanical bushings and rings within
conventional drilling systems to serve many important functions,
including: providing an indication that a core barrel assembly has
reached a drilling position and is latched to a drill string;
serving as a mechanical shut-off valve that restricts the flow of
drilling fluid within a core barrel assembly; and serving as a
grease seal at the connection between an inner tube cap and an
inner tube that receives a core sample. Conventional nylon bushings
are dimensionally sensitive to humidity and are difficult to
machine with the specific dimensions that are required for use in
drilling applications. In particular, it is difficult to machine
conventional nylon bushings with the slight interference fit
required to produce a consistent fluid pressure signal.
Additionally, conventional nylon bushings are subject to
significant wear in drilling applications. Conventional
polyurethane compression rings are subject to increased deformation
with continued use, and they exhibit significant wear during
tripping. In combination, these limitations of polyurethane
compression rings result in inconsistent performance and/or
decreased productivity during drilling operations.
[0004] Thus, there is a need in the pertinent art for fluid control
assemblies that provide the above-referenced functions during
drilling operations without the deficiencies associated with
conventional bushings and compression rings. In particular, there
is a need for fluid control assemblies within core barrel
assemblies that are not dimensionally sensitive to humidity, can be
easily machined to specific dimensions, are not subject to
significant wear in drilling applications, and have consistent
deformation with continued use.
SUMMARY
[0005] Described herein, in one aspect, is a fluid control assembly
having a longitudinal axis and including at least one spiral ring
and a bushing. Each spiral ring can have inner surfaces that
cooperate to define an inner diameter of the spiral ring and outer
surfaces that cooperate to define an outer diameter of the spiral
ring. Each spiral ring can be configured for axial and radial
compression and expansion relative to the longitudinal axis. The
bushing can have an inner surface that defines an inlet, an outlet,
a central bore extending between the inlet and the outlet, and at
least one slot positioned in communication with the central bore at
a location between the inlet and the outlet. At least one slot of
the bushing can be configured to receive the at least one spiral
ring, and the at least one slot can be configured to retain the at
least one spiral ring during axial and radial compression and
expansion of the at least one spiral ring.
[0006] Also described herein is a fluid control assembly having a
longitudinal axis and including at least one spiral ring and at
least one tapered ring. Each spiral ring can have inner surfaces
that cooperate to define an inner diameter of the spiral ring and
outer surfaces that cooperate to define an outer diameter of the
spiral ring. Each spiral ring can be configured for axial and
radial compression and expansion relative to the longitudinal axis.
Each tapered ring can have a first end, an opposed second end, an
inner surface, and an outer surface. The inner surface of each
tapered ring can define a central bore extending from the first end
to the second end of the tapered ring. The outer surface of each
tapered ring can be outwardly tapered relative to the longitudinal
axis of the fluid control assembly moving from the first end to the
second end of the tapered ring. The first end of each tapered ring
can have a first outer diameter that is less than the inner
diameter of each spiral ring. Each spiral ring can be configured to
circumferentially surround at least the first end of a respective
tapered ring. Movement of the at least one tapered ring relative to
the longitudinal axis of the fluid control assembly can be
configured to effect radial compression and expansion of the at
least one spiral ring relative to the longitudinal axis of the
fluid control assembly.
[0007] Core barrel assemblies comprising the disclosed fluid
control assemblies are also described. Additionally, methods of
controlling fluid flow using the disclosed fluid control assemblies
are described.
[0008] Further described is a core barrel assembly having a
longitudinal axis and including an upper latch body, a lower latch
body, a core sample tube, and a fluid control assembly. The lower
latch body can cooperate with the upper latch body to define an
inner channel. The lower latch body can include a core sample tube
cap and a valve body that has an outer surface, with the valve body
being operatively received within the core sample tube cap. The
core sample tube can be operatively coupled to the core sample tube
cap of the lower latch body. The fluid control assembly can include
at least one spiral ring. Each spiral ring can have inner surfaces
that cooperate to define an inner diameter of the spiral ring and
outer surfaces that cooperate to define an outer diameter of the
spiral ring. Each spiral ring can be configured for axial and
radial compression and expansion relative to the longitudinal axis.
The inner surfaces of the at least one spiral ring of the fluid
control assembly can be positioned in circumferential engagement
with the outer surface of the core sample tube cap of the lower
latch body. The fluid control assembly can be configured to permit
relative axial movement of the lower core barrel subassembly and
the core sample tube. Methods of using the core barrel assembly are
also described.
[0009] Additional advantages of the invention will be set forth in
part in the description which follows, and in part will be obvious
from the description, or may be learned by practice of the
invention. The advantages of the invention will be realized and
attained by means of the elements and combinations particularly
pointed out in the appended claims. It is to be understood that
both the foregoing general description and the following detailed
description are exemplary and explanatory only and are not
restrictive of the invention, as claimed.
DETAILED DESCRIPTION OF THE FIGURES
[0010] These and other features of the preferred embodiments of the
invention will become more apparent in the detailed description in
which reference is made to the appended drawings wherein:
[0011] FIG. 1A is a perspective view of an exemplary spiral ring as
disclosed herein. FIG. 1B is a side view of the spiral ring of FIG.
1A, showing a crossover portion of the spiral ring. FIG. 1C is a
side view of the spiral ring of FIG. 1A, showing the side of the
spiral ring opposite the crossover portion.
[0012] FIG. 2A is a perspective view of an exemplary bushing as
disclosed herein. FIG. 2B is a front view of the bushing of FIG.
2A, showing an inlet of the bushing.
[0013] FIG. 3 is a partially transparent perspective view of an
exemplary fluid control assembly having a bushing and at least one
spiral ring as disclosed herein.
[0014] FIG. 4A depicts a cross-sectional view of an exemplary core
barrel assembly having a fluid control assembly for providing a
pressure change indication as disclosed herein. FIG. 4B depicts a
close-up view of the latch assembly, the fluid ports, the valve
member, the fluid control assembly, and the lower latch body of the
core barrel assembly of FIG. 4A. FIG. 4C depicts a close-up view of
the valve member and the fluid control assembly of FIG. 4A.
[0015] FIG. 5A depicts a cross-sectional view of an exemplary
overshot assembly having a fluid control assembly for providing a
pressure change indication as disclosed herein. FIG. 5B depicts a
close-up view of the upper overshot body, the seals, the seal seat,
the valve member, the fluid control assembly, and the overshot head
of the overshot assembly of FIG. 5A. FIG. 5C depicts a close-up
view of the valve member and the fluid control assembly of FIG.
5A.
[0016] FIG. 6A depicts a cross-sectional view of a core barrel
assembly, showing a first exemplary configuration of a fluid
control assembly for serving as a mechanical shut-off valve as
disclosed herein. FIG. 6B is a close-up view of the fluid control
assembly of FIG. 6A.
[0017] FIG. 7A depicts a cross-sectional view of a core barrel
assembly, showing a second exemplary configuration of a fluid
control assembly for serving as a mechanical shut-off valve as
disclosed herein. FIG. 7B is a close-up view of the fluid control
assembly of FIG. 7A.
[0018] FIG. 8A depicts a cross-sectional view of a core barrel
assembly, showing a third exemplary configuration of a fluid
control assembly for serving as a mechanical shut-off valve as
disclosed herein. FIG. 8B is a close-up view of the fluid control
assembly of FIG. 8A.
[0019] FIG. 9A illustrates a cross-sectional view of a core barrel
assembly having a fluid control assembly for serving as a grease
seal as disclosed herein. FIG. 9B depicts a cross-sectional
close-up view of a conventional bronze bushing as is known in the
art. FIG. 9C depicts a cross-sectional close-up view of the fluid
control assembly shown in FIG. 9A.
DETAILED DESCRIPTION
[0020] The present invention can be understood more readily by
reference to the following detailed description, examples,
drawings, and claims, and their previous and following description.
However, before the present devices, systems, and/or methods are
disclosed and described, it is to be understood that this invention
is not limited to the specific devices, systems, and/or methods
disclosed unless otherwise specified, as such can, of course, vary.
It is also to be understood that the terminology used herein is for
the purpose of describing particular aspects only and is not
intended to be limiting.
[0021] The following description of the invention is provided as an
enabling teaching of the invention in its best, currently known
embodiment. To this end, those skilled in the relevant art will
recognize and appreciate that many changes can be made to the
various aspects of the invention described herein, while still
obtaining the beneficial results of the present invention. It will
also be apparent that some of the desired benefits of the present
invention can be obtained by selecting some of the features of the
present invention without utilizing other features. Accordingly,
those who work in the art will recognize that many modifications
and adaptations to the present invention are possible and can even
be desirable in certain circumstances and are a part of the present
invention. Thus, the following description is provided as
illustrative of the principles of the present invention and not in
limitation thereof.
[0022] As used throughout, the singular forms "a," "an" and "the"
include plural referents unless the context clearly dictates
otherwise. Thus, for example, reference to "a spiral ring" can
include two or more such spiral rings unless the context indicates
otherwise.
[0023] Ranges can be expressed herein as from "about" one
particular value, and/or to "about" another particular value. When
such a range is expressed, another aspect includes from the one
particular value and/or to the other particular value. Similarly,
when values are expressed as approximations, by use of the
antecedent "about," it will be understood that the particular value
forms another aspect. It will be further understood that the
endpoints of each of the ranges are significant both in relation to
the other endpoint, and independently of the other endpoint.
[0024] As used herein, the terms "optional" or "optionally" mean
that the subsequently described event or circumstance may or may
not occur, and that the description includes instances where said
event or circumstance occurs and instances where it does not.
[0025] The word "or" as used herein means any one member of a
particular list and also includes any combination of members of
that list.
[0026] As used herein the terms "lower" and "distal" refer to a
direction toward a drilling formation (and toward the end of a
drilling system including a drill bit), whether the drill string be
oriented horizontally, at an upward angle, or a downward angle
relative to the horizontal. As used herein, the term "upper" and
"proximal" refer to a direction away from a drilling formation (and
toward the end of a drilling system opposite the drill bit). Thus,
the spearhead of a core barrel assembly is generally positioned at
a proximal end of the core barrel assembly, while the lower latch
body of a core barrel assembly is generally positioned near a
distal end of the core barrel assembly.
Fluid Control Assemblies for Use in Drilling Systems
[0027] Disclosed herein are fluid control assemblies for
effectively and efficiently controlling the flow of fluid within
drilling tools and systems, and systems and methods for using such
fluid control assemblies. The disclosed fluid control assemblies
can be used in various drilling applications. In some exemplary
aspects, the disclosed fluid control assemblies can be used in
place of existing indicator bushings within core barrel assemblies
or overshot assemblies. In other exemplary aspects, the disclosed
fluid control assemblies can be used in place of existing
mechanical shut-off valves within core barrel assemblies. In still
other exemplary aspects, the disclosed fluid control assemblies can
be used in place of existing grease seals within core barrel
assemblies.
[0028] As further described herein, and with reference to FIGS.
1A-1B, each disclosed fluid control assembly can comprise at least
one spiral ring 720, 820, 950. Each spiral ring 720, 820, 950 can
have inner surfaces 722, 822, 952 that cooperate to define an inner
diameter 724, 824, 954 of the spiral ring and outer surfaces 726,
826, 956 that cooperate to define an outer diameter of the spiral
ring. The inner surface 722, 822, 952 can further define a central
space 723, 823, 953. As shown in FIGS. 1A-1C, each spiral ring 720,
820, 950 can comprise a single element that is formed into a spiral
configuration. In these aspects, it is contemplated that each
spiral ring can comprise a single element that is formed into at
least first and second circumferential layers, with the second
circumferential layer axially spaced from the first circumferential
layer relative to a longitudinal axis extending through the central
space 723, 823, 953. In order to form the spiral configuration, and
as shown in FIGS. 1A-1C, each spiral ring 720, 820, 950 can
comprise a crossover portion 725, 825, 955 where the spiral ring
extends between the first and second layers. In exemplary aspects,
the crossover portion 725, 825, 955 can be positioned at a selected
acute angle with respect to the planes of the first and second
layers. Each spiral ring 720, 820, 950 can define a groove that is
positioned between the first and second layers relative to the
longitudinal axis and that terminates proximate the crossover
portion 725, 825, 955. In use, each spiral ring 720, 820, 950 can
be configured for axial and radial compression and expansion
relative to a longitudinal axis that extends through the central
space 723.
[0029] Optionally, it is contemplated that the at least one spiral
ring 720, 820, 950 of each fluid control assembly disclosed herein
can comprise a plurality of spiral rings that are positioned
axially relative to the longitudinal axis of each respective fluid
control assembly. In some optional aspects, the at least one spiral
ring 720, 820, 950 can comprise at least two stacked spiral rings.
In other optional aspects, the at least one spiral ring 720, 820,
950 can comprise at least two spiral rings that are axially spaced
from one another.
[0030] Optionally, in further aspects, it is contemplated that each
spiral ring 720, 820, 950 can be a single-turn spiral ring. In
other optional aspects, it is contemplated that each spiral ring
720, 820, 950 can be a multiple-turn spiral ring, such as, for
example and without limitation, a double-turn spiral ring. As one
will appreciate, it is contemplated that a multiple-turn spiral
ring can comprise a plurality of crossover portions as further
described herein, with each turn of the spiral ring comprising a
plurality of circumferential layers.
[0031] In exemplary aspects, the disclosed spiral rings 720, 820,
950 can optionally be a laminar ring manufactured by Smalley Steel
Ring Company. In other exemplary aspects, the disclosed spiral
rings 720, 820, 950 can optionally be a FEY laminar ring
manufactured by OEM International, Inc. However, it is contemplated
that any known spiral ring that is capable of forming a laminar
seal can be used.
[0032] As further described herein, it is contemplated that the use
of spiral rings within the disclosed fluid control assemblies can
overcome the deficiencies associated with the use of conventional
bushings and compression rings during drilling operations. In
particular, it is contemplated that the disclosed fluid control
assemblies are not dimensionally sensitive to humidity, can be
easily machined to specific dimensions, are not subject to
significant wear in drilling applications, and exhibit consistent
deformation with continued use.
Fluid Control Assemblies that Provide an Indication of Pressure
Changes
[0033] In exemplary aspects, and as shown in FIGS. 2A-5C, a fluid
control assembly 700 can be used in place of known indicator
bushings within core barrel assemblies and overshot assemblies. In
one aspect, the fluid control assembly 700 can have a longitudinal
axis 710.
[0034] In another aspect, the fluid control assembly 700 can
comprise at least one spiral ring 720. In this aspect, each spiral
ring 720 can have inner surfaces 722 that cooperate to define an
inner diameter 724 of the spiral ring and outer surfaces 726 that
cooperate to define an outer diameter 728 of the spiral ring. In
use, it is contemplated that each spiral ring 720 can be configured
for axial and radial compression and expansion relative to the
longitudinal axis 710. Optionally, the at least one spiral ring 720
can provide a plurality of stacked spiral rings that are positioned
in substantial alignment relative to the longitudinal axis 710.
[0035] In a further aspect, the fluid control assembly 700 can
comprise a bushing 730 having an outer surface 744 and an inner
surface 732 that defines an inlet 734, an outlet 736, a central
bore 738 extending between the inlet and the outlet, and at least
one slot 740 positioned in communication with the central bore at a
location between the inlet and the outlet. In this aspect, the at
least one slot 740 of the bushing 730 can be configured to receive
the at least one spiral ring 720. In use, the at least one slot 740
can be configured to retain (and accommodate) the at least one
spiral ring 720 during axial and radial compression and expansion
of the at least one spiral ring. In exemplary aspects, the inlet
734 of the bushing 730 can define a first inner diameter 735 of the
bushing, and the first inner diameter of the bushing can be greater
than the inner diameter 724 of the at least one spiral ring
720.
[0036] In an additional aspect, at least a portion of the inner
surface 732 of the bushing 730 between the inlet 734 and the at
least one slot 740 of the bushing can be inwardly tapered relative
to the longitudinal axis 710 of the fluid control assembly 700.
Optionally, in this aspect, it is contemplated that at least a
portion of the inner surface 732 of the bushing 730 between the at
least one slot 740 and the outlet 736 of the bushing can be
outwardly tapered relative to the longitudinal axis 710 of the
fluid control assembly 700. In exemplary aspects, the tapered
portion of the inner surface 732 between the at least one slot 740
and the outlet 736 of the bushing 730 can be configured to receive
at least a portion of a piston, ball, or other valve element.
[0037] In a further aspect, the inner surface 732 of the bushing
730 can define a recess (not shown) proximate the at least one slot
740 of the bushing. In this aspect, the recess can be positioned
between the at least one slot 140 and the outlet 736 of the bushing
730 relative to the longitudinal axis 710 of the fluid control
assembly 700. In exemplary aspects, the recess can be configured to
receive at least a portion of a piston or other valve element.
[0038] Optionally, in various aspects, the at least one spiral ring
720 of the fluid control assembly can comprise a plurality of
spiral rings.
[0039] In another aspect, the at least one spiral ring 720 of the
fluid control assembly 700 can be configured to circumferentially
surround the longitudinal axis 710 when the at least one spiral
ring is positioned within the at least one slot 740 of the bushing
730.
[0040] In still another aspect, the at least one slot 740 of the
bushing 730 can comprise a single slot that circumferentially
surrounds the central bore 738 of the bushing.
[0041] Optionally, in various exemplary aspects, the outer surface
744 of the bushing 730 can have a first portion positioned
proximate the inlet 734 of the bushing and a second portion
positioned proximate the outlet 736 of the bushing. In these
aspects, the first portion of the outer surface 744 of the bushing
730 can project outwardly from the second portion of the bushing
relative to the longitudinal axis 710 of the fluid control assembly
700 such that the first portion of the outer surface defines
opposed first and second shoulder surfaces extending substantially
perpendicularly relative to the longitudinal axis. It is
contemplated that the first portion of the outer surface 744 of the
bushing 730 defines a circumferential groove positioned between the
first and second shoulder surfaces relative to the longitudinal
axis 710 of the fluid control assembly 700.
[0042] As shown in FIGS. 4A-4C, the fluid control assembly 700 can
be employed within a conventional core barrel assembly 100. In
exemplary aspects, the conventional core barrel assembly 100 can
comprise a spearhead assembly 110, an upper latch body 120, a latch
assembly 130, a valve member 140, at least one fluid port 150, a
lower latch body 160, and a spindle 170 as are known in the art. In
exemplary aspects, the valve member 140 can be a ball element;
however, it is contemplated that any conventional valve member,
such as a valve piston, can be used. It is contemplated that the
disclosed fluid control assembly 700 can be used in the manner of
conventional indicator bushings to control fluid flow within a core
barrel assembly.
[0043] In operation, it is contemplated that the valve member 140
can move axially relative to the longitudinal axis 710 in and out
of engagement with the at least one spiral ring 720 within the
bushing 730, thereby forming a valve. More specifically, it is
contemplated that the valve member 140 can be positioned against
the at least one spiral ring 720, thereby cooperating with the at
least one spiral ring and the bushing 730 to seal off a central
bore defined by the upper and lower latch bodies. In use, the at
least one spiral ring can have a spring resistance response to the
travel of the valve member (e.g., valve piston) that varies with
the variable geometry of the valve member. It is contemplated that
this variable spring resistance response can permit the at least
one spiral ring to cooperate with the bushing 730 to generate a
pressure signal as further disclosed herein.
[0044] In some exemplary aspects, and as depicted in FIGS. 4A-4C,
the fluid control assembly 700 can be used with a surface or
down-hole core barrel assembly. In these aspects, it is
contemplated that a seal will not be formed between the upper and
lower latch bodies and the drill string (outer tube) until the core
barrel assembly lands against a landing shoulder and landing ring
in the manner known in the art. Thus, during tripping of surface or
down-hole core barrel assemblies, it is contemplated that the only
pressure build-up within the valve (formed by the fluid control
assembly 700 and the valve member 140) will be related to drag
resistance. It is contemplated that surface or down-hole core
barrel assemblies can be operated without the need for braking
elements as further disclosed herein with respect to pump-in
drilling applications.
[0045] In additional aspects, when the valve member 140 comprises a
ball member as depicted in FIGS. 4A-4C, it is contemplated that the
ball member can be configured to freely pass through the at least
one spiral ring 720 and bushing 730 if there is sufficient
resistance to the core barrel assembly as it trips into a drill
hole. However, in surface or down-hole drilling operations, because
there is no resistance as the core barrel assembly falls into the
drill hole, the ball cannot overcome the resistance of the at least
one spiral ring 720 until the core barrel assembly has landed and
formed a seal with the outer annulus (between the latch bodies and
the drill string).
[0046] In further aspects, when the valve member 140 comprises a
valve piston that is connected to a latch retracting case of the
latch assembly 130, it is contemplated that the valve piston cannot
extend through the at least one spiral ring 720 until the latch
assembly is positioned in a deployed position, upon landing of the
core barrel assembly. In these aspects, it is contemplated that the
latch assembly can comprise latches that are configured to deploy
into a groove formed in a locking coupling as is known in the
art.
[0047] Optionally, in exemplary aspects, the fluid control assembly
700 can be used within a core barrel assembly that is pumped into a
drill string at an incline to match the incline of a drill hole. In
these aspects, it is contemplated that the at least one spiral ring
720 can cooperate with the bushing 730 to maintain a seal condition
As the core barrel assembly is pumped down the drill string, the
pump-in force can act on the valve member, causing a proximal end
of a channel within the valve member to engage a pin. Thus, in
inclined hole pump-in applications, it is contemplated that the
pump in force can exert a distally directed force on the valve
member 140 and a portion of the core barrel assembly.
[0048] Optionally, in pump-in applications, it is contemplated that
the core barrel assembly 100 can comprise braking elements (not
shown) that ride on an inner diameter of a drill string such that
any further distal movement of the braking elements, pin, and valve
member 140 relative to a landing member and sleeve can be
prevented. Thus, in these applications, it is contemplated that the
valve member 140 can be prevented from being pushed through the at
least one spiral ring 720 and bushing 730 by the pump in force.
Additionally, in these applications, a driving member can be
prevented from moving axially in the distal direction relative to
the sleeve, which can be retained in a radially retracted
portion.
[0049] In surface, down-hole, and pump-in applications, when in the
drilling position, the valve member 140 can pass distally beyond
the at least one spiral ring 720 within the bushing 730. This can
allow fluid to flow within the central bore, past the seal. Thus,
the fluid control assembly 700 can allow drilling fluid to reach
the drill bit to provide flushing and cooling as desired or needed
during a drilling process. One will appreciate in light of the
disclosure herein that a pressure spike can be created and then
released as the core barrel reaches the drilling position and the
valve member 140 passes beyond the at least one spiral ring within
the bushing 730. This pressure spike can provide an indication to a
drill operator that the core barrel assembly has reached the
drilling position, and is latched to the drill string.
[0050] Optionally, in exemplary pump-in applications, it is
contemplated that the fluid control assembly 700 can be designed to
allow the valve member 140 described herein to remain closed during
retraction of the core barrel assembly such that fluid pressure can
be maintained. For such pump-in applications, when the valve member
140 is a valve piston, it is further contemplated that the fluid
control assembly 700 can be applied to a core barrel assembly as
described herein without a braking mechanism, thereby permitting
application of fluid pressure to remove weight and spring force
from the latch assembly, ensuring a substantially load-free
un-latching process, and preventing build-up of pressurized fluid.
In these applications, it is contemplated that the valve piston can
be retracted back through the at least one spiral ring 720 as the
latch assembly is retracted, permitting retrieval of the head
assembly.
[0051] In one aspect, in configurations where the outer surface 744
of the bushing 730 of the fluid control assembly 700 has a first
portion that projects outwardly from a second portion of the
bushing to define first and second shoulder surfaces and a
circumferential groove, it is contemplated that the dimensions and
aspect ratio of the groove can be selectively varied to provide a
reduction in the bushing resistance to the interference fit of the
valve member 140 as the valve member passes through the bushing.
However, it is contemplated that the circumferential groove can be
removed to provide the maximum resistance and as a result a
significantly higher fluid pressure build up and greater available
supply fluid pump capacity as to allow for deeper hole depths.
[0052] In exemplary aspects, and as previously described, it is
contemplated that the bushing 730 can allow the valve member 140 to
remain closed during retraction of the core barrel assembly such
that fluid pressure can be maintained. In these aspects, it is
contemplated that the second portion of the outer surface of the
bushing 730 functions as an extension which permits the valve to
remain closed during retraction of the core barrel assembly. It is
further contemplated that the bushing 730 can be applied to a core
barrel assembly without a braking mechanism, thereby permitting
application of fluid pressure to remove weight and spring force
from any suitable latching mechanism, ensuring a substantially
load-free un-latching process, and preventing build-up of
pressurized fluid.
[0053] In exemplary aspects, it is contemplated that the provision
of an inwardly tapered inner surface between the inlet 734 of the
bushing 730 and the at least one spiral ring 720 can provide an
angle transition to guide and gradually centralize the valve member
140 and to generate gradual changes in fluid pressures. In
exemplary aspects, when the inner surface 732 of the bushing 730
defines a recess between the at least one spiral ring 720 and the
outlet 736 of the bushing, it is contemplated that the relative
dimensions and angles of the recess can be configured to achieve a
different fit and pressure signal (upon engagement with the valve
member 140) when compared to the at least one spiral ring 720.
[0054] In other exemplary aspects, a sleeve of the core barrel
assembly can have an inner surface that defines an inner
projection. In these aspects, it is contemplated that at least a
portion of the outer surface 744 of the bushing 730 can be
configured for engagement with the inner surface of the sleeve. It
is further contemplated that the second shoulder surface of the
bushing 730 can be configured for engagement with the inner
projection of the sleeve. It is still further contemplated that the
inner projection of the sleeve can be positioned proximate a first
fluid port of the at least one fluid port such that the outlet 736
of the bushing 730 is in fluid communication with the first fluid
port. In exemplary aspects, at least a portion of the second
portion of the outer surface 744 of the bushing 730 can overlap
with a portion of at least one fluid port 150 relative to the
longitudinal axis of the core barrel assembly such that a portion
of the second portion of the outer surface of the bushing is
substantially adjacent to an innermost portion of the fluid
port.
[0055] In another aspect, the lower latch body 160 can be removably
coupled to the sleeve. In this aspect, it is contemplated that the
first shoulder surface of the bushing 730 can be configured for
engagement with the lower latch body. It is further contemplated
that the lower latch body can have a first surface that defines an
outlet in fluid communication with the inlet 734 of the bushing
730, with the outlet of the lower latch body being in communication
with the central bore.
[0056] In an additional aspect, it is contemplated that the central
bore 738 of the bushing 730 can be configured to receive at least a
portion of the valve member 140 such that axial movement of the
valve member 140 relative to the longitudinal axis 710 of the fluid
control subassembly 700 selectively controls fluid flow through the
bushing 730. It is further contemplated that at least a portion of
the valve member 140 can remain within the central bore 738 of the
bushing 730 at all times.
[0057] In exemplary aspects, the valve member 140 can be moveable
about and between a blocking position and an open position. In
these aspects, in the open position, the valve member 140 can be
positioned between the at least one spiral ring 720 of the fluid
control assembly 700 and the inlet 734 of the bushing 730 such that
the valve member is disengaged from the inner surface 732 of the
bushing. In the blocking position, a portion of the valve member
120 can be configured for engagement with at least a portion of the
inner surface 732 of the bushing 730. For example, it is
contemplated that a portion of the valve member 140 can be
configured for engagement with the inner surface 732 of the bushing
730 between the at least one spiral ring 720 of the bushing and the
outlet 736 of the bushing. In further aspects, it is contemplated
that the recess of the bushing 730 can be configured to receive at
least a portion of the valve member 140 when the valve member is
positioned in the blocking position. In these aspects, in order to
move the valve member from the blocking position to the open
position, an axial force sufficient to advance the portion of the
piston out of the recess and past the at least one spiral ring 720
must be applied. It is contemplated that the axial force must also
be sufficient to overcome any water that is resting against the
portion of the valve member 140.
[0058] It is contemplated that the positioning of the valve member
140 in the open position (such as, for example, by passage of a
portion of the valve member through the at least one spiral ring
720 of the fluid control assembly 700) can cause a pressure drop as
water begins draining through the central bore 738 of the bushing
730 and the at least one fluid port 150 of the sleeve. Thus, it is
contemplated that the valve member 140 can function as a landing
indicator for the core barrel assembly.
[0059] In additional aspects, it is contemplated that an end
portion of the valve member 140 and the outlet 736 of the bushing
730 can have respective diameters. In these aspects, it is
contemplated that the diameter of the outlet 736 can be less than
or equal to the diameter of the end portion of the valve member 140
such that the end portion of the valve member is positioned within
the bushing 730 in an interference fit. In additional aspects, the
first inner diameter 735 of the bushing 730 (defined by the inlet
734 of the bushing as described above) can be greater than the
diameter of the end portion of the valve member. In still further
aspects, the inner diameter 724 of the at least one spiral ring 720
can be less than the diameter of the end portion of the valve
member. In still further aspects, when the valve member comprises a
piston, the piston can have an elongate shaft portion with a
diameter that is less than the diameter of the end portion of the
piston. In exemplary aspects, the end portion of the piston can
conform to the shape of the recess and the at least one spiral ring
720 such that, when the end portion of the piston is positioned
within the recess, the end portion of the piston cooperates with
the at least one spiral ring to maintain a blocking position in
which water cannot pass around the piston.
[0060] In use, following engagement between the valve member 140
and the at least one spiral ring 720 as described above, it is
contemplated that continued axial movement of the valve member
through the fluid control assembly 700 can effect radial and/or
axial expansion of the at least one spiral ring until the valve
member passes through the at least one spiral ring, at which time
the at least one spiral ring can return to a radially and axially
compressed position.
[0061] As shown in FIGS. 5A-5C, the fluid control assembly 700 can
be employed within a conventional overshot assembly 300. In
exemplary aspects, the conventional overshot assembly 300 can
comprise a swivel 310, a swivel eye 320, an upper body portion 330,
at least one seal 340, a seal seat 350, a valve member 360, and an
overshot head 370 as are known in the art. In exemplary aspects,
the valve member 140 can be a ball element; however, it is
contemplated that any conventional valve member, such as a valve
piston, can be used. In exemplary aspects, the fluid control
assembly 700 can be at least partially received within the overshot
head 370 and be positioned in abutting relation to a distal end of
the seal seat 350. The valve member 360 can be at least partially
received within the fluid control assembly 700 and configured for
axial movement relative to the longitudinal axis 710 of the fluid
control assembly. It is contemplated that the disclosed fluid
control assembly 700 can be used in the manner of conventional
indicator bushings to control fluid flow within an overshot
assembly. Generally, it is contemplated that the valve member 360
and the fluid control assembly 700 can be configured to control
fluid flow in the same manner as valve member 140 and fluid control
assembly 700, discussed above.
[0062] In exemplary aspects, when the overshot assembly 300 is a
pump-in overshot assembly, it is contemplated that the fluid
control assembly 700 can provide an internal seal, which, in
combination with an external seal provided by the overshot
assembly, can allow tripping in under fluid pressure. It is further
contemplated that following opening of the fluid control assembly
700 after landing of the overshot assembly, the fluid control
assembly can be configured to allow for fluid bypass during
retraction of the overshot assembly to prevent fluid from being
forced out of a flat or declined drill hole when tripping out of
the hole. This is in contrast to conventional overshot designs,
which either do not have a fluid control valve at all (requiring
retraction of any retained column of fluid along with the retracted
head assembly) or have a simple fluid control valve without any
landing indication feature.
[0063] In further exemplary aspects, the fluid control assembly 700
can be configured to remain in an open condition to permit
retraction of a head assembly in an inclined drill hole. In these
aspects, it is contemplated that the fluid control assembly 700
must be in an open condition to permit unloading of the latching
mechanism and to permit unloading of a latch mechanism, and to
permit unloading of a braking assembly.
Fluid Control Assemblies that Serve as Mechanical Shut-Off
Valves
[0064] In exemplary aspects, and as shown in FIGS. 6A-8B, a fluid
control assembly 800 can be used in place of known mechanical
shut-off valves within core barrel assemblies. In one aspect, the
fluid control assembly 800 can have a longitudinal axis 810.
[0065] In another aspect, the fluid control assembly 800 can
comprise at least one spiral ring 820. In this aspect, each spiral
ring 820 can have inner surfaces 822 that cooperate to define an
inner diameter 824 of the spiral ring and outer surfaces 826 that
cooperate to define an outer diameter 828 of the spiral ring. In
use, it is contemplated that each spiral ring 820 can be configured
for axial and radial compression and expansion relative to the
longitudinal axis 810.
[0066] In an additional aspect, the fluid control assembly 800 can
comprise at least one tapered ring 830. In this aspect, each
tapered ring 830 can have a distal first end, an opposed (proximal)
second end, an inner surface, and an outer surface. The inner
surface of each tapered ring 830 can define a central bore
extending from the first end to the second end of the tapered ring.
The outer surface of each tapered ring can be outwardly tapered
relative to the longitudinal axis 810 of the fluid control assembly
800 moving in a proximal direction from the first end to the second
end of the tapered ring 830. It is contemplated that the first end
of each tapered ring 830 can have a first outer diameter that is
less than the inner diameter of each spiral ring 820.
[0067] In exemplary aspects, each spiral ring 820 can be configured
to circumferentially surround at least the first end of a
respective tapered ring 830. In these aspects, it is contemplated
that movement of the at least one tapered ring 830 relative to the
longitudinal axis 810 of the fluid control assembly 800 can effect
radial compression and expansion of the at least one spiral ring
820 relative to the longitudinal axis of the fluid control
assembly.
[0068] Optionally, the at least one spiral ring 820 can comprise a
plurality of spiral rings, and the at least one tapered ring 830
can comprise a plurality of tapered rings.
[0069] Optionally, in further aspects, and as shown in FIGS. 6A-7B,
the fluid control assembly 800 can further comprise at least one
spring element 850. In these aspects, each spring element 850 can
have a minimum inner diameter and a maximum outer diameter. It is
contemplated that the maximum outer diameter of each spring element
can be greater than the inner diameter of each spiral ring 820.
Optionally, in exemplary aspects, the at least one spring element
850 can comprise at least one spring disc. Optionally, in further
exemplary aspects, the at least one spring element 850 can comprise
at least one inverted spring disc, such as, for example and without
limitation an inverted Belleville washer.
[0070] In additional aspects, the at least one spring element 850
can be configured to provide resistance to axial movement of the at
least one tapered ring 830 relative to the longitudinal axis 810 of
the fluid control assembly 800. Optionally, in these aspects, each
respective spring element 850 can be positioned in contact with at
least one tapered ring 830.
[0071] As shown in FIGS. 6A-8B, the fluid control assembly 800 can
be employed within a conventional core barrel assembly 100. In
exemplary aspects, the conventional core barrel assembly 100 can
comprise a spearhead assembly 110, an upper latch body 120, a latch
assembly 130, a lower latch body 160, a spindle 170, a bearing
assembly, and an inner (core sample) tube cap as are known in the
art. The spindle 170 can comprise a flange portion that projects
radially relative to adjoining portions of the spindle, and the
fluid control assembly 800 can be positioned between the flange
portion of the spindle 170 and the bearing assembly relative to the
longitudinal axis of the fluid control assembly 810. It is
contemplated that the disclosed fluid control assembly 800 can be
used in the manner of conventional mechanical shut-off valves to
control fluid flow within a core barrel assembly.
[0072] A first exemplary configuration of the fluid control
assembly 800 is depicted in FIGS. 6A-6B. As shown, in one aspect,
the fluid control assembly 800 can comprise at least two spiral
rings 820, at least two tapered rings 830, and at least two spring
elements 850. In this aspect, each respective tapered ring 830 can
be at least partially received within a respective spiral ring 820,
with the distal first ends of each respective tapered ring received
within a respective spiral ring. In an additional aspect, a portion
of the outer surface of each respective tapered ring can be
positioned in engagement with at least a portion of the inner
surfaces of a respective spiral ring 820. In another aspect, a top
portion of each spring element 850 can have an outer portion
positioned in engagement with at least a portion of a distal
surface of a respective spiral ring 820. Optionally, in a further
aspect, the top portion of each spring element 850 can have an
inner portion positioned in engagement with at least a portion of
the distal first end of a respective tapered ring 830. In an
additional aspect, the at least two tapered rings can optionally
comprise a proximal tapered ring and a distal tapered ring, with
the second (proximal) end of the proximal tapered ring being
positioned substantially flush to the flange portion of the spindle
170. In this aspect, it is further contemplated that an inner
portion of the second (proximal) end of the distal tapered ring can
be positioned in engagement with a portion of a first spring
element positioned between the proximal and distal tapered rings
relative to the longitudinal axis of the fluid control assembly. It
is further contemplated that a second spring element can be
positioned between the distal tapered ring and the bearing assembly
of the core barrel assembly, with at least an inner portion of the
second spring element being positioned in engagement with the
bearing assembly.
[0073] A second exemplary configuration of the fluid control
assembly 800 is depicted in FIGS. 7A-7B. As shown, in one aspect,
the fluid control assembly 800 can comprise at least two spiral
rings 820, at least two tapered rings 830, and at least two spring
elements 850. In this aspect, each respective tapered ring 830 can
be at least partially received within a respective spiral ring 820,
with the distal first ends of each respective tapered ring received
within a respective spiral ring. In an additional aspect, a portion
of the outer surface of each respective tapered ring 830 can be
positioned in engagement with at least a portion of the inner
surfaces of a respective spiral ring 820. In another aspect, a top
portion of each spring element 850 can have an outer portion
positioned in engagement with at least a portion of a distal
surface of a respective spiral ring 820. Optionally, in a further
aspect, the top portion of each spring element 850 can have an
inner portion that is axially spaced from the distal end of a
respective tapered ring 830 when the spring element is in an
expanded position. In an additional aspect, the at least two
tapered rings can optionally comprise a proximal tapered ring and a
distal tapered ring, with the second (proximal) end of the proximal
tapered ring being positioned substantially flush to the flange
portion of the spindle 170. In this aspect, it is further
contemplated that the at least two spiral rings can comprise
proximal and distal spiral rings, with an outer portion of the
second (proximal) end of the distal tapered ring being positioned
in engagement with a portion of the proximal spiral ring. It is
further contemplated that a second spring element can be positioned
between the distal spiral ring and the bearing assembly of the core
barrel assembly, with at least an outer portion of the second
spring element being positioned in engagement with the bearing
assembly.
[0074] A third exemplary configuration of the fluid control
assembly 800 is depicted in FIGS. 8A-8B. As shown, in one aspect,
the fluid control assembly 800 can comprise at least two spiral
rings 820 and at least two tapered rings 830. In this aspect, each
respective tapered ring 830 can be at least partially received
within a respective spiral ring 820, with the distal first ends of
each respective tapered ring received within a respective spiral
ring. In an additional aspect, a portion of the outer surface of
each respective tapered ring 830 can be positioned in engagement
with at least a portion of the inner surfaces of a respective
spiral ring 820. In an additional aspect, the at least two tapered
rings can optionally comprise a proximal tapered ring and a distal
tapered ring, with the second (proximal) end of the proximal
tapered ring being positioned substantially flush to the flange
portion of the spindle 170. In this aspect, it is further
contemplated that the at least two spiral rings can comprise
proximal and distal spiral rings, with the second (proximal) end of
the distal tapered ring being positioned in engagement with a
portion of the proximal spiral ring. It is further contemplated
that the distal spiral ring can be positioned between and in
engagement with the distal tapered ring and the bearing assembly of
the core barrel assembly.
[0075] When the fluid control assembly 800 comprises spring
elements 850 as disclosed herein, it is contemplated that the
spring elements can provide additional spring resistance and travel
to permit an inner (core sample) tube cap to absorb the load of a
blocked or filled inner (core sample) tube that is resisting the
feed force from a drill rig. It is contemplated that the at least
one spiral ring of the fluid control assembly 800 can be configured
for sufficient radial growth to sealingly engage an outer tube of
the core barrel assembly and close the annular fluid passage
defined between the upper and lower latch bodies and the outer
tube.
[0076] It is contemplated that the spring elements 850 can be
omitted from the fluid control assembly 800 when the at least one
spiral ring 820 has sufficient spring resistance and is capable of
sufficient radial growth to form an annular seal with the outer
tube of the core barrel assembly.
[0077] In use, the at least one spiral ring 820 can have a spring
resistance response to the travel of the valve member that varies
with the variable geometry of the tapered rings 830. It is
contemplated that this variable spring resistance response can
permit the at least one spiral ring to close off the annular
passage as discussed above to thereby generate a pressure signal
that can be sensed by drilling operators.
Fluid Control Assemblies that Serve as Grease Seals
[0078] In exemplary aspects, and as shown in FIGS. 9A and 9C, a
fluid control assembly 900 can be used in place of known fluid
seals (e.g., grease seals) within core barrel assemblies, such as,
for example and without limitation, bronze bushings within core
barrel assemblies. In one aspect, a core barrel assembly 100 having
such a fluid control assembly 900 can have a longitudinal axis 110.
A conventional bronze bushing 168 is shown in FIG. 9B. In the same
manner of conventional bronze bushings, it is contemplated that the
disclosed fluid control assembly 900 can allow for relative rotary
motion of mating parts of a core sample tube cap (inner tube cap),
which have slight clearance fits in either the inner diameter or
the outer diameter.
[0079] In another aspect, the core barrel assembly 100 can comprise
an upper latch body and a lower latch body 160 that cooperates with
the upper latch body to define an inner channel 162. Optionally,
the lower latch body 160 can comprise a spindle 170 that defines at
least a portion of the inner channel 162. In an additional aspect,
the lower latch body 160 can comprise a core sample tube cap and a
valve body 164 (e.g., check valve body) that has an outer surface
166, with the valve body being operatively received within the core
sample tube cap.
[0080] In a further aspect, the core barrel assembly 100 can
comprise a core sample tube (not shown) operatively coupled to the
core sample tube cap of the lower latch body 160 and positioned in
fluid communication with the inner channel 162 of the lower latch
body.
[0081] In an additional aspect, the fluid control assembly 900 of
the core barrel assembly 100 can comprise at least one spiral ring
952. Each spiral ring 952 can have inner surfaces 954 that
cooperate to define an inner diameter 956 of the spiral ring and
outer surfaces 958 that cooperate to define an outer diameter 960
of the spiral ring. In use, it is contemplated that each spiral
ring 952 can be configured for axial and radial compression and
expansion relative to the longitudinal axis 110 of the core barrel
assembly 100.
[0082] In a further aspect, the inner surfaces 954 of the at least
one spiral ring 952 of the fluid control assembly 950 can be
positioned in circumferential engagement with the outer surface 166
of the valve body 164 of the lower latch body 160. In this aspect,
it is contemplated that the fluid control assembly 950 can be
configured to permit axial movement of core sample tube relative to
the lower latch body 160. It is further contemplated that, during
such axial movement, the fluid control assembly 950 can be
configured to maintain a seal between an inner surface of the core
sample tube cap and the valve body 164. In use, it is contemplated
that the at least one spiral ring 952 of the fluid control assembly
950 can exhibit spring expansion, which allows for slightly
eccentric motion if a mating component of the core sample tube cap
is not properly aligned or is not running "true" to another mating
component of the core sample tube due to manufacturing tolerances,
abuse, or bending overload.
[0083] It is contemplated that the fluid control assembly 950 of
the core barrel assembly 100 can be used in the manner of
conventional sealing elements to control fluid flow within the core
barrel assembly.
[0084] In exemplary applications, the fluid control assembly 950
can be configured to control the flow of grease within the lower
latch body 160. It is contemplated that the retention of grease can
provide lubrication of one or more bearings housed within the core
sample tube cap, while also preventing entry of foreign debris into
the core sample tube cap, thereby preventing accelerated wear of
the mating parts of the core sample tube cap or the housed
bearings.
Exemplary Aspects
[0085] In view of the described fluid control assemblies, core
barrel assemblies, overshot assemblies, and methods and variations
thereof, herein below are described certain more particularly
described aspects of the invention. These particularly recited
aspects should not however be interpreted to have any limiting
effect on any different claims containing different or more general
teachings described herein, or that the "particular" aspects are
somehow limited in some way other than the inherent meanings of the
language literally used therein.
[0086] Aspect 1: A fluid control assembly having a longitudinal
axis, comprising: at least one spiral ring, each spiral ring having
inner surfaces that cooperate to define an inner diameter of the
spiral ring and outer surfaces that cooperate to define an outer
diameter of the spiral ring, wherein the spiral ring is configured
for axial and radial compression and expansion relative to the
longitudinal axis; a bushing having an inner surface that defines
an inlet, an outlet, a central bore extending between the inlet and
the outlet, and at least one slot positioned in communication with
the central bore at a location between the inlet and the outlet,
wherein the at least one slot of the bushing is configured to
receive the at least one spiral ring, wherein the at least one slot
is configured to retain the at least one spiral ring during axial
and radial compression and expansion of the at least one spiral
ring.
[0087] Aspect 2: The fluid control assembly of aspect 1, wherein
the inlet of the bushing defines a first inner diameter of the
bushing, and wherein the first inner diameter of the bushing is
greater than the inner diameter of the at least one spiral
ring.
[0088] Aspect 3: The fluid control assembly of aspect 2, wherein at
least a portion of the inner surface of the bushing between the
inlet and the at least one slot of the bushing is inwardly tapered
relative to the longitudinal axis of the fluid control
assembly.
[0089] Aspect 4: The fluid control assembly of aspect 2, wherein
the inner surface of the bushing defines a recess proximate the at
least one slot of the bushing, the recess being positioned between
the at least one slot and the outlet of the bushing relative to the
longitudinal axis of the fluid control assembly.
[0090] Aspect 5: The fluid control assembly of aspect 4, wherein
the recess is configured to receive at least a portion of a
piston.
[0091] Aspect 6: The fluid control assembly of aspect 3, wherein at
least a portion of the inner surface of the bushing between the at
least one slot and the outlet of the bushing is outwardly tapered
relative to the longitudinal axis of the fluid control
assembly.
[0092] Aspect 7: The fluid control assembly of aspect 6, wherein
the tapered portion of the inner surface between the at least one
slot and the outlet of the bushing is configured to receive at
least a portion of a valve member, wherein the valve member is
selected from the group consisting of a ball element and a valve
piston.
[0093] Aspect 8: The fluid control assembly of aspect 2, wherein
the at least one spiral ring is configured to circumferentially
surround the longitudinal axis of the fluid control assembly when
the at least one spiral ring is positioned within the at least one
slot of the bushing.
[0094] Aspect 9: The fluid control assembly of aspect 1, wherein
the at least one slot of the bushing comprises a single slot that
circumferentially surrounds the central bore of the bushing.
[0095] Aspect 10: The fluid control assembly of aspect 1, wherein
the outer surface of the bushing has a first portion positioned
proximate the inlet of the bushing and a second portion positioned
proximate the outlet of the bushing, wherein the first portion of
the outer surface of the bushing projects outwardly from the second
portion of the bushing relative to the longitudinal axis of the
fluid control assembly such that the first portion of the outer
surface defines opposed first and second shoulder surfaces
extending substantially perpendicularly relative to the
longitudinal axis.
[0096] Aspect 11: The fluid control assembly of aspect 10, wherein
the first portion of the outer surface of the bushing defines a
circumferential groove positioned between the first and second
shoulder surfaces relative to the longitudinal axis of the
bushing.
[0097] Aspect 12: A core barrel head assembly comprising the fluid
control assembly recited in any one of aspects 1-11.
[0098] Aspect 13: An overshot assembly comprising the fluid control
assembly recited in any one of aspects 1-11.
[0099] Aspect 14: A method of controlling fluid flow within a core
barrel head assembly using the fluid control assembly recited in
any one of aspects 1-11.
[0100] Aspect 15: A method of controlling fluid flow within an
overshot assembly using the fluid control assembly recited in any
one of aspects 1-11.
[0101] Aspect 16: A fluid control assembly having a longitudinal
axis, comprising: at least one spiral ring, each spiral ring having
inner surfaces that cooperate to define an inner diameter of the
spiral ring and outer surfaces that cooperate to define an outer
diameter of the spiral ring, wherein the spiral ring is configured
for axial and radial compression and expansion relative to the
longitudinal axis; and at least one tapered ring, each tapered ring
having a first end, an opposed second end, an inner surface, and an
outer surface, wherein the inner surface of each tapered ring
defines a central bore extending from the first end to the second
end of the tapered ring, wherein the outer surface of each tapered
ring is outwardly tapered relative to the longitudinal axis of the
fluid control assembly moving from the first end to the second end
of the tapered ring, wherein the first end of each tapered ring has
a first outer diameter that is less than the inner diameter of each
spiral ring, wherein each spiral ring is configured to
circumferentially surround at least the first end of a respective
tapered ring, and wherein movement of the at least one tapered ring
relative to the longitudinal axis of the fluid control assembly is
configured to effect radial compression and expansion of the at
least one spiral ring relative to the longitudinal axis of the
fluid control assembly.
[0102] Aspect 17: The fluid control assembly of aspect 16, wherein
the at least one spiral ring comprises a plurality of spiral rings,
and wherein the at least one tapered ring comprises a plurality of
tapered rings.
[0103] Aspect 18: The fluid control assembly of aspect 16, further
comprising at least one spring element, wherein each spring element
has a minimum inner diameter and a maximum outer diameter, wherein
the maximum outer diameter of each spring element is greater than
the inner diameter of each spiral ring.
[0104] Aspect 19: The fluid control assembly of aspect 18, wherein
the at least one spring element is configured to provide resistance
to axial movement of the at least one tapered ring relative to the
longitudinal axis of the fluid control assembly.
[0105] Aspect 20: The fluid control assembly of aspect 19, wherein
each respective spring element is positioned in contact with at
least one tapered ring.
[0106] Aspect 21: The fluid control assembly of aspect 18, wherein
the at least one spring element comprises at least one spring
disc.
[0107] Aspect 22: A core barrel head assembly comprising the fluid
control assembly recited in any one of aspects 16-21.
[0108] Aspect 23: A method of controlling fluid flow within a drill
string using the fluid control assembly recited in any one of
aspects 16-21.
[0109] Aspect 24: A core barrel assembly having a longitudinal
axis, comprising: an upper latch body; a lower latch body that
cooperates with the upper latch body to define an inner channel,
the lower latch body comprising a core sample tube cap and a valve
body, the valve body having an outer surface and being operatively
received within the core sample tube cap; a core sample tube
operatively coupled to the core sample tube cap of the lower latch
body and positioned in selective fluid communication with the inner
channel of the lower latch body; and a fluid control assembly
comprising at least one spiral ring, each spiral ring having inner
surfaces that cooperate to define an inner diameter of the spiral
ring and outer surfaces that cooperate to define an outer diameter
of the spiral ring, wherein the spiral ring is configured for axial
and radial compression and expansion relative to the longitudinal
axis, wherein the inner surfaces of the at least one spiral ring of
the fluid control assembly are positioned in circumferential
engagement with the outer surface of the valve body of the lower
latch body, and wherein the fluid control assembly is configured to
permit axial movement of the core sample tube relative to the lower
latch body.
[0110] Aspect 25: The core barrel assembly of aspect 24, wherein
the fluid control assembly is configured to control the flow of
grease within the lower core barrel subassembly.
[0111] Aspect 26: A method of controlling fluid flow using the core
barrel assembly recited in any one of aspects 24-25.
[0112] Although several embodiments of the invention have been
disclosed in the foregoing specification, it is understood by those
skilled in the art that many modifications and other embodiments of
the invention will come to mind to which the invention pertains,
having the benefit of the teaching presented in the foregoing
description and associated drawings. It is thus understood that the
invention is not limited to the specific embodiments disclosed
hereinabove, and that many modifications and other embodiments are
intended to be included within the scope of the appended claims.
Moreover, although specific terms are employed herein, as well as
in the claims which follow, they are used only in a generic and
descriptive sense, and not for the purposes of limiting the
described invention, nor the claims which follow.
* * * * *