U.S. patent number 3,779,263 [Application Number 05/224,755] was granted by the patent office on 1973-12-18 for pressure responsive auxiliary disc valve and the like for well cleaning, testing, and other operations.
This patent grant is currently assigned to Halliburton Company. Invention is credited to Arnold Glen Edwards, Charles J. Jenkins.
United States Patent |
3,779,263 |
Edwards , et al. |
December 18, 1973 |
PRESSURE RESPONSIVE AUXILIARY DISC VALVE AND THE LIKE FOR WELL
CLEANING, TESTING, AND OTHER OPERATIONS
Abstract
A full opening pressure operated disc valve particularly suited
for cleaning formation perforations by surging and for other
operations comprises a rupturable sealing element and a sliding
tubular rupture member actuated by a controlled pressure
differential between the tubing chamber and the casing annulus,
with said element and rupture member being located concentrically
within a tubular body and having an ID substantially the same as
that of the tubing string.
Inventors: |
Edwards; Arnold Glen (Duncan,
OK), Jenkins; Charles J. (Duncan, OK) |
Assignee: |
Halliburton Company (Duncan,
OK)
|
Family
ID: |
22842044 |
Appl.
No.: |
05/224,755 |
Filed: |
February 9, 1972 |
Current U.S.
Class: |
137/68.25;
166/311; 166/374; 137/68.27; 137/68.3; 137/910 |
Current CPC
Class: |
E21B
34/063 (20130101); F16K 13/04 (20130101); E21B
34/10 (20130101); E21B 37/08 (20130101); Y10T
137/1729 (20150401); Y10T 137/1744 (20150401); Y10T
137/1767 (20150401); Y10S 137/91 (20130101) |
Current International
Class: |
E21B
34/06 (20060101); E21B 34/00 (20060101); E21B
34/10 (20060101); F16k 013/04 (); E21b
021/00 () |
Field of
Search: |
;166/315 ;137/68-71
;175/317,318 ;220/89A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Schwadron; Martin P.
Assistant Examiner: Gerard; Richard
Claims
What is claimed is:
1. A pressure responsive rupture valve adapted to be attached in a
tubing string or a tool string and lowered into a borehole
penetrating an underground earth formation, said rupture valve
comprising:
a. an elongated tubular housing having port means through the wall
thereof communicating between the interior of said housing and its
exterior;
b. rupturable sealing means located within said tubular housing and
sealingly fixed within said housing transversely to the
longitudinal axis of said housing for sealing the internal passage
of said housing against liquid or gas flow therethrough; and
c. rupture means located telescopically and concentrically within
said tubular housing near said rupturable sealing means, said
rupture means having piston means located thereon; said rupture
means, said piston means, and said tubular housing arranged to form
coacting piston chamber means in said rupture valve, said piston
means and chamber means fluidically communicating with said port
means and adapted to receive fluid pressure through said port means
and transmit said pressure into transverse movement of said rupture
means through said rupturable sealing means, said rupture means
having pressure relief means therein for preventing hydraulic lock
by the action of said piston means in said chamber means, said
pressure relief means further comprising port relief means in said
rupture means on the opposite side of said piston means from said
port means.
2. The valve of claim 1 wherein said tubular housing further
comprises:
a. one or more cylindrical housing members having connector means
at each end;
b. a valve seat collar attached to said cylindrical housing members
and containing a valve seat shoulder for seating said rupturable
sealing means;
c. a tubular upper adapter for securing the upper end of said
tubular housing to a standard well tubing or other tool; and
d. a tubular lower adapter for securing the lower end of said
tubular housing to standard well tubing or other tool.
3. The valve of claim 2 wherein said cylindrical housing members
and said upper and lower adapters are connected with one another by
mated threaded ends and are sealingly engaged with one another by a
plurality of circular seals located concentrically between every
two adjacent joined members.
4. The valve of claim 3 wherein said rupturable sealing means
comprises a domed circular rupture disc made of a material selected
from the group consisting of magnesium, magnesium alloys, aluminum,
aluminum alloys, plastic, rubber, copper, copper alloys, glass
fiber reinforced epoxy, wood, and glass.
5. The valve of claim 3 wherein said rupture means comprises a
tubular cutting sleeve in abutment with one or more tubular piston
sleeves, with said tubular cutting sleeve having an angular cutting
edge at one end pointing toward said rupturable sealing element,
and the other end of said cutting sleeve being in abutment with one
of said piston sleeves.
Description
BACKGROUND OF THE INVENTION
Surging is not a new technique, and apparatus for surging a
formation can be obtained commercially. Some of the types of valves
obtainable include those which utilize rupture discs such as in U.
S. Pat. Nos. 2,565,731; and 2,263,412. Most of the tools available
in the prior art contain complex rupturing mechanisms with bulky
configurations so that, after the disc is ruptured, flow of fluid
from the formation through the tool is hindered by the presence of
the rupturing mechanisms. The devices utilize rupturing techniques
consisting of dropping heavy metal bars down the tubing to strike
the rupture mechanism and cause the rupturing of the disc.
Other tools capable of surging and which utilize a surge chamber
are those similar to the one disclosed by U. S. Pat. No. 3,589,442,
which uses an explosive charge to open the surge chamber. These
devices occupy a great amount of the cross-sectional area of the
tool and greatly restrict flow. They also lack the instantaneous
surging effect because the actuation mechanism or explosion may
initially force fluid and debris further into the formation before
the reaction back into the surge chamber can occur. Further
restrictions in the flow area into the surge chamber prevent an
instantaneous surge.
Tools which utilize fluid pressure to actuate the valve include
those disclosed in U. S. Pat. Nos. 3,361,212; 2,855,952; 3,205,955;
and 3,211,232. These and other devices generally utilize ball
valves or check valves in the tubing passage which restrict flow of
fluids therethrough. Other types use flow passages running inside
the wall of the tool in conjunction with sliding mandrels inside
the tool for opening and closing ports in the interior passages.
All of these tools are impractical for surging due to their
restricted flow passages and slow opening nature.
Still other valves in the prior art require lifting and rotating
the tubing string one or more times in order to open and close the
valve ports.
SUMMARY OF THE INVENTION
The present invention overcomes these and other problems by
providing a full-opening instantaneous surging tool which is
actuated from the surface by applying fluid pressure to either the
inside of the tubing or the annulus between the tubing and the
casing, which pressure acts on a tubular rupture member forcing it
into a rupturable sealing element, breaking the seal in the tubing
passage, and allowing fluid in the formation to surge through the
fully opened tool into the air-filled surge chamber above the
sealing element, carrying sediment, debris, and perforating
by-products with it. The tool can then be allowed to set in the
well bore until the debris settles out of the fluid into the trap
or "rathole" at the bottom of the well bore, and then normal
testing or production operations can be continued, with the tool
offering no hindrance to such operations due to its full opening
characteristic.
The tool is particularly useful as a testing valve when complicated
testing equipment, commonly termed a "christmas tree," is located
on the well at the surface, atop the tubing string, and it is
impractical to have to lift and rotate the tubing string or drop
heavy metal bars or balls through the tubing in order to actuate
the valve. Use of this invention allows pressure to be easily
applied through the annulus or through the testing apparatus into
the tubing to open the valve when testing is to begin. After the
valve has been used there is no need to withdraw it immediately or
drill it out to allow further operations in the well. Due to its
large inner diameter, almost equal to that of the tubing string,
other tools or devices can be passed down the string and through
the valve without any trouble.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view partly in section of the annulus pressure
responsive valve, including a tubular housing, the cutting sleeve,
and one rupture disc;
FIG. 2 is a view partly in section of the tubing pressure
responsive valve, including the tubular housing, the cutting
sleeve, and one rupture disc;
FIGS. 3 and 4 show the use of single rupture valve as an auxiliary
valve or testing valve;
FIGS. 5, 6, and 7 are elevational cross-sections of a tubing
pressure responsive disc valve used in conjunction with an annulus
pressure responsive disc valve and other standard tools showing the
different stages of surging operations;
FIG. 8 is an axial view of the rupture disc illustrating the
scoring in the disc to allow it to be broken into small parts when
rupturing is initiated;
FIG. 9 represents the method and apparatus for altering surge
chamber length; and
FIG. 10 is a view of an alternative cutting edge for the rupture
member.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIGS. 1-10, number 1 represents the pressure
responsive rupture disc valve in which an upper adapter 2, with
internal threads at 20 for securing to the tubing string, is
threadedly connected to the valve seat collar 3 containing a valve
seat shoulder 30 upon which is seated the rupturable sealing
element, or rupture disc 4. Valve seat collar 3 contains internal
threads 31 at its upper end and external threads 32 at its lower
end. Internal threads 31 mate with external threads 21 of the upper
adapter 2.
Threadedly attached to valve seat collar 3 are one or more sleeve
housings 5. Each sleeve housing has internal threads 51 mating with
external threads of the adjacent upper member, and has external
threads 52 at its lower end mating with internal threads on the
adjacent lower member. Each housing 5 has a fluid port 53
communicating from the exterior of the tool to the expansion
chamber 6. Interior to and concentric with the cylindrical sleeve
housing 5 is a tubular rupture member 7 comprising one or more
piston sleeves 7A and rupture device 7B all of which are hollow
tubular cylinders. Abutting the top of the piston sleeve 7A is a
rupture device 7B with an angular cutting edge 71. The piston
sleeves 7A contain shoulders 72 which act as pistons in expansion
chamber 6. Expansion chamber 6 and backflow chamber 61 are formed
between the lower end 33 of the upper adjacent threadedly secured
member, the inner surface of the outer wall 54 of the sleeve
housing 5, lower chamber shoulder 55 of the sleeve housing 5, and
the piston sleeve itself, which is slidably positioned inside the
inner passage of the tool. Circular seals 8 located between the
sleeve housing 5 and the piston sleeve 7A serve to maintain a
pressure-tight chamber 6.
Threadedly secured to the lowermost sleeve housing 5 is the bottom
adapter 9 with internal threads 91 and external threads 92.
External threads 92 are for securing the tool to the next tool or
next joint of regular tubing.
Circular seals 10 serve to prevent fluid seepage or pressure loss
from the interior of the tool to the exterior of the tool or vice
versa, and are placed between all components which are threaded
together. Circular disc seal 11 is placed circumferentially around
the rupture disc 4 to prevent premature loss of fluid around the
rupture disc.
Ports 73 in piston sleeve 7A provide fluid communication between
back flow chamber 61 and the interior of the sleeve passage.
In typical operation, referring to FIGS. 3 and 4, the tool 1, as
described above, is placed in the tubing string 102 and lowered
into the well bore 103. A packer 114 is usually located beneath the
tool 1 on the tubing string 102 and is used to isolate the annulus
104 from the tubing passage 105. The packer 114 is set when the
valve tool 1 has been lowered to the proper depth in the well. The
testing apparatus, or "christmas tree" (not shown) can then be
attached to the tubing string at the surface and when it is
desirable to begin testing flow, pressure is applied to the annulus
fluid from pumps at the surface, causing a pressure differential
across the piston shoulder 72 in FIG. 1, causing the piston sleeve
7A to move upwardly toward the rupture disc 4. This forces the
cutting sleeve 7B upward toward the disc 4. The cutting edge 71 of
the cutting sleeve 7B contacts the rupture disc 4 and when the
annulus pressure reaches a predetermined level, the cutting sleeve
is driven through the rupture disc 4, fully opening the inner
passage of the tool 1. The rupture disc may be deeply scored 41 as
shown in FIG. 8 to facilitate breaking up of the disc while the
cutting sleeve 7B is passing through it, thereby preventing
clogging of the passage through the cutting sleeve by the severed
disc. When the valve is opened, the disc is almost completely cut
out leaving an opening in the disc at least as large as the outer
diameter of the cutting sleeve and allowing passage of additional
tools and devices down through the valve tool 1 to other tools
below it. The opening of the valve is thus accomplished without
disturbing the testing apparatus at the wellhead. The lack of inner
restrictions allows further work to be done in the well without
need of removing the valve 1.
In FIG. 2, a tubing pressure responsive (TPR) valve 101 is revealed
wherein all the elements of the annulus pressure responsive (APR)
valve 1 are present but in slightly different color. The valve seat
collar 3 and rupture disc 4 have been removed from between the
upper adapter 2 and the sleeve chamber 5, the disc rotated
180.degree., and both components placed between the sleeve chamber
5 and the bottom adapter 9. The upper adapter 2 and the sleeve
chamber 5 are then threadedly secured to each other. The cutting
sleeve 7B is removed from its abutting position atop the piston
sleeve 7A, is rotated 180.degree. so that the cutting edge 71 is
pointing downward toward the relocated rupture disc 4, and is
inserted in abutting position at the lower end of the piston sleeve
7A. In its initial position, the piston sleeve 7A in the TPR valve
is pushed to the uppermost point within the valve passage so that
shoulder 72 is almost touching lower lip 56 of the upper adjacent
member 2. In operation, the TPR tool 101 is lowered into the well
on the tubing string, a packer is set below the tool which isolates
the tubing passage from the annulus, and pressure is applied to the
tubing passage causing fluid pressure to act through ports 73 and
against shoulder 72 attempting to reach the lower pressure area in
expansion chamber 6. The resulting pressure differential across
shoulder 72 forces cutting and piston sleeves 7A and 7B downward,
thereby cutting disc 4 which opens the tool completely.
Referring now to FIGS. 5, 6, and 7, a method for cleaning
perforations in a formation by surging is illustrated using a
combination of the annulus pressure responsive (APR) valve 1 and
the tubing pressure responsive (TPR) valve 101. The APR valve 1 is
placed in the drill string below the TPR valve 101 and is installed
such as to leave an air-tight chamber 112 between the two rupture
discs 4. As shown in FIG. 9, the length of the air chamber 112 can
be controlled by the amount of tubing 115 inserted between the APR
valve and the TPR valve, if any.
The tools are lowered into the well to the desired depth and
circulating valves 113 may be used above and below the disc valves
1 and 101. Circulating valves 113 are held open while the tools are
being inserted in order to allow fluid in the well to flow through
the tubing while it is being lowered into the hole. This
facilitates the lowering step and allows the establishment of a
fluid cushion 107 above the top disc and extending to the surface.
A packer 114 located at the bottom of the well string is set and
the circulating valves 113 are closed. Commercially available
packers and circulating valves such as those manufactured and sold
by Halliburton Company under the designation RTTS circulating
valves and RTTS packers can be used.
Pressure is applied to the annulus 104 which opens the lower disc
valve 4 exposing the air chamber 112, which is at a comparatively
low pressure, to the comparatively high fluid pressure in the
formation 108. The fluid 109 in the formation 108 rushes
instantaneously into the air chamber carrying with it debris and
perforation by-products, cleaning the perforations in the
formation. The annulus pressure is released and operations may be
ceased for a period of time sufficient to allow the debris to
settle into the trap 110, or "rathole," usually five minutes or
more. The tubing passage 105 is then pressured up to the pressure
required to open the TPR valve 101 which opening then occurs, and
the tubing inner passage 105 is then completely clear all the way
from the formation 108 to the surface (not shown). If desired,
fluid can then be pumped down the annulus and up the tubing
carrying out the debris. Flow tests, stimulation treatment, or
consolidation applications may be performed, without interference,
through the tubing, and the valves 101 and 1 can be easily removed
from the hole if desired.
The tremendous advantages from the use of this invention for
surging operations derive in part from the full opening
characteristics of the tool due to the large ID of the disc cutting
means, and from the instantaneous opening and quick surge obtained.
Other tools which are available for surging lack the instantaneous
surging effect and the full opening feature of this invention.
It is common knowledge that the velocity of a fluid determines its
ability to sweep debris out of the formation. For a given
perforation's cross-sectional area the flow velocity therethrough
is dependent upon the mass flow rate of the fluid which is
permitted into the surge tool. This in turn is a function of the
cross-sectional flow area of the tool in its opened position. Due
to the large flow area of the tool of this invention, maximum flow
rates are achieved, giving maximum flow velocity in the
perforations and in turn maximum cleaning effect. These maximums
are far above those of the prior art tools due to the restricted
flow areas of those tools.
The surging can be controlled by this invention by the use of
varying lengths of surge chamber. A surge chamber is used because
it is not desirable to have surging completely to the surface, for
safety reasons and because such unchecked surge is destructive to
the formation.
FIG. 9 illustrates the use of standard tubing 115 between the APR
valve 1 and the TPR valve 101. The length of the surge chamber 112
can thus be varied from a few feet in length with no tubing
inserted between the two valves, to as long as is needed by the
insertion of tubing or tubular members threaded between the two
valves 1 and 101. Standard tubing is used because of its
comparatively low cost and widespread availability although any
strong tubular member of any desired length could serve as an air
chamber extension as long as it contained sufficient connecting
means at its ends to interconnect it between the two valves.
Another advantage of this invention when using in testing with
complicated apparatus attached to the well-head is that it is
wholly operable by fluid pressure from the surface and requires no
lifting and setting down nor any rotational motion to activate
either type valve.
Other advantages of this invention include the effect of a positive
indication to the operator at the surface as to when the surge
begins so that he can time the settling period accurately. This
indication consists of a sharp jerk on the tubing string at the
opening, which indication can be amplified by the use of shear
means between the rupture device and the housing in order to
achieve an over-pressuring and a more decisive jerk on the
tubing.
Also due to the flow-through design above and below the surge
chamber through the use of circulating valves above and below the
tools, the tool is pressure balanced going into the hole and
premature opening is prevented. The tool is safer to use because no
manipulation of the tubing is required to open it. It is very
simple to operate, dependable, and can be used over and over again
merely by replacing the low-cost rupture disc.
The pressure required to operate the valve can be varied over an
extremely broad range in several ways. One manner of variation is
to vary the thickness and/or composition of the rupture disc to
vary its rupture strength. Another method involves varying the
differential pressure area between the piston sleeves and the
sleeve housings to vary the activating pressure required. Another
method would involve changing the cutting angle or the sharpness of
the cutting edge of the cutting sleeve. Another method of
increasing the available rupturing force is to add one or more
identical piston sleeves 7A and a corresponding number of sleeve
housings 5 to the tool.
Also due to the simplicity of the component parts and their
interchangeability between TPR usage and APR usage, the tool is
very inexpensive to manufacture when compared to the complex tools
of the prior art. The rupture discs can be made of any frangible
material such as magnesium and its alloys, copper and its alloys,
aluminum and its alloys, hard rubber, plastic, epoxy with glass
fibers, phenolics, wood, or glass, as long as the material has
sufficient rupture strength to prevent premature opening when going
into the well. The discs may be flat or, as in one preferred
embodiment herein, they can be domed for additional strength
against ambient pressures which does not substantially effect the
force required for rupturing. The discs can be scored as in FIG. 8
to obtain several small particles upon rupturing rather than one
large piece.
The remaining components of the tool can be of any tough metal or
metal alloy such as steel or stainless steel.
The rupture member 7B is stated as being a tubular sleeve with an
angular cutting edge. While this is the preferred embodiment it is
possible that the rupture element might be of non-circular cross
section and have a squared off cutting edge or a multiangular
cutting edge 77 with two or more points for rupturing as in FIG.
10. The rupture member is perferably made of a tough metal such as
steel or stainless steel or can be a drillable material such as
aluminum alloy or cast iron.
Seals used may be composed of any commercially available suitable
sealing material such as natural or artificial rubber and can be of
the O-ring type.
Although a specific preferred embodiment of the present invention
has been described in the detailed description above, the
description is not intended to limit the invention to the
particular forms or embodiments disclosed herein, since they are to
be recognized as illustrative rather than restrictive and it will
be obvious to those skilled in the art that the invention is not so
limited. For example, the tool of this invention is described for
use as a testing valve or surging tool but it can also be used as
an auxiliary valve. Also, the ID of the valve is stated to be near
that of the tubing string but this is not a necessary limitation as
the ID could be reduced to any desirable dimension by several
methods, such as increasing the wall thickness of the tubular
housing and/or the tubular rupture element. Thus, the invention is
declared to cover all changes and modifications of the specific
example of the invention herein disclosed for purposes of
illustration, which do not constitute departures from the spirit
and scope of the invention.
* * * * *