U.S. patent application number 16/764288 was filed with the patent office on 2020-11-19 for a hybrid bit with roller cone having inserts.
The applicant listed for this patent is KINGDREAM PUBLIC LIMITED COMPANY. Invention is credited to Zongwen LIU, Guanfu TU.
Application Number | 20200362638 16/764288 |
Document ID | / |
Family ID | 1000005015302 |
Filed Date | 2020-11-19 |
United States Patent
Application |
20200362638 |
Kind Code |
A1 |
TU; Guanfu ; et al. |
November 19, 2020 |
A HYBRID BIT WITH ROLLER CONE HAVING INSERTS
Abstract
The present disclosure relates to a hybrid bit with roller cone
having inserts, comprising a bit body, blades disposed with the bit
body, a plurality of fixed cutting elements arranged side by side
along the outer edge of blades and roller cones mounted with the
said bit body in circumferential and alternate arrangement with the
said blades, the said roller cones having multiple rows of cone
inserts arranged side by side along the meridian direction of
cones, and the said cones having multiple rows of cone inserts
arranged side by side along the weft direction of cones, the
cutting insert rows of adjacent two cones herein are in alternate
arrangement, the cutting insert rows of adjacent two cones are in
derangement and the insert placement structure in the plurality of
cones is the same.
Inventors: |
TU; Guanfu; (Wuhan, Hubei,
CN) ; LIU; Zongwen; (Wuhan, Hubei, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KINGDREAM PUBLIC LIMITED COMPANY |
Wuhan, Hubei |
|
CN |
|
|
Family ID: |
1000005015302 |
Appl. No.: |
16/764288 |
Filed: |
October 30, 2018 |
PCT Filed: |
October 30, 2018 |
PCT NO: |
PCT/CN2018/112519 |
371 Date: |
May 14, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21B 10/43 20130101;
E21B 10/60 20130101; E21B 10/18 20130101; E21B 10/14 20130101; E21B
10/50 20130101; E21B 10/16 20130101 |
International
Class: |
E21B 10/16 20060101
E21B010/16; E21B 10/50 20060101 E21B010/50; E21B 10/18 20060101
E21B010/18; E21B 10/14 20060101 E21B010/14; E21B 10/60 20060101
E21B010/60; E21B 10/43 20060101 E21B010/43 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 16, 2017 |
CN |
201711138078.X |
Claims
1. A hybrid bit with roller cone having inserts, comprising: a bit
body; a plurality of blades disposed on the bit body; a plurality
of fixed cutting elements arranged side by side along the outer
edge of a plurality of blades; and a plurality of roller cones
mounted with the said bit body in circumferential and alternate
arrangement along the said bit body, the said cones having
plurality rows of cone inserts arranged side by side along the
meridian direction of cones, and the said cones having plurality
rows of cone inserts arranged side by side along the weft direction
of cones, the cutting inserts of adjacent two cones herein among
the said cutting insert rows are in alternate arrangement, the
cutting insert rows of adjacent two cones are in derangement and
the insert placement structure in a plurality of cones is the
same.
2. The hybrid bit with roller cone having inserts according to
claim 1, wherein the insert placement structure comprises: the
distance between a row of cone inserts and a central axis of the
bit body; the space between two adjacent rows of cutting inserts;
the space of cutting insert rows between two adjacent cones among
the cutting rows of inserts; the shape of cone inserts; and the
size of cone inserts.
3. The hybrid bit with roller cone having inserts according to
claim 1, wherein nozzles for jetting cutting fluid mounted at the
said bit body.
4. The hybrid bit with roller cone having inserts according to
claim 1, wherein a head is disposed between at least two adjacent
blades circumferentially with its upper end integrated with the bit
body, and a cone disposed at its lower end.
5. The hybrid bit with roller cone having inserts according to
claim 1, wherein the said blade comprises the inner cone, nose,
shoulder and gage sections from inside to outside, and a plurality
of the said fixed cutting elements are arranged side by side at the
inner cone, nose, shoulder and gage sections.
6. The hybrid bit with roller cone having inserts according to
claim 1, wherein the fixed cutting elements at a plurality of the
said blades are arranged differently, and the said cutter placement
includes the distance between the fixed cutting elements and the
center of the said bit body.
7. The hybrid bit with roller cone having inserts according to
claim 6, wherein a plurality of fixed cutting elements are disposed
side by side from inside to outside of each of the said blades to
cover the whole bottom-hole, and the gyration radiuses of all the
cutting elements in blades are different as well.
8. The hybrid bit with roller cone having inserts according to
claim 1, wherein the outermost profile envelope of cone cutters
herein and the profile envelope of fixed cutting elements are in
parallel and spaced from 0 mm to 2.0 mm in the direction away from
the axis of the said bit body, and the outermost profile of said
cone inserts is closer to the inside or closer to the outside than
the said profile envelope of the said fixed cutting elements.
9. The hybrid bit with roller cone having inserts according to
claim 1, wherein at the lowest point of cutting trajectory, the
center line of the said cone inserts extending circumferentially
overlaps with or approximates to the center line of one cutting
element of a blade extending circumferentially along the said bit
body.
10. The hybrid bit with roller cone having inserts according to
claim 1, wherein, there are 2-6 blades; there are 2-6 roller cones;
and the number of roller cones are equal to or less than blades
numbers.
11. The hybrid bit with roller cone having inserts according to
claim 1, wherein, the roller cone comprises 6-20 rows of cutting
inserts; and each row of cone inserts comprises 6-20 cutting
inserts.
12. The hybrid bit with roller cone having inserts according to
claim 1, wherein the cone inserts are cemented carbide inserts or
mixed cutting elements with cemented carbide and polycrystalline
diamond.
13. The hybrid bit with roller cone having inserts according to
claim 1, wherein the fixed cutting elements are diamond cutters.
Description
PRIORITY CLAIM
[0001] The present application is a national stage of
PCT/CN2018/112519, filed on Oct. 30, 2018, which claims priority to
Chinese patent application number 201711138078.X and an application
date of Nov. 16, 2017, and the disclosure contents of the PCT and
Chinese patent applications are herein incorporated by
reference.
FIELD OF THE DISCLOSURE
[0002] The present disclosure relates to a hybrid bit with roller
cone having inserts in petroleum, natural gas and geological
drilling, which is suitable for the penetration in stringer and
hard formation.
BACKGROUND OF THE ART
[0003] In present technologies, a conventional polycrystalline
diamond cutter (PDC) bit drills at bottom-hole through scraping
when encountering hard formation during drilling, the main cutting
elements are difficult to penetrate into rocks at bottom hole, so
the rate-of-penetration (ROP) of a diamond bit becomes very slow,
while a roller cone bit fractures rock through crushing, deeper
broken pits are easy to be produced. Due to hard formation,
volumetric fracture in rock cannot be produced, and hence the ROP
of a roller cone bit is very slow. On the other hand, when
encountering formation with staggered stringers from soft to hard,
the cutting elements of a PDC bit tend to be broken by impact. In
order to cope with the condition, a roller cone and PDC hybrid bit
with relatively high comprehensive property is put forward to
improve its ROP by making preliminary breakage to formation through
cone cutters to release formation stress, and then scraping the
formation through cutters in fixed blades, and meanwhile, the
cutters in the fixed blades are protected well to prolong its
service life, but the structure of available roller cone and
diamond bit is not reasonable enough. On one hand, each row of cone
inserts with the same cutting trajectory among the rows of
available hybrid bit is located at the same cone, and the structure
of cutter placement in each cone of available hybrid bit is
different, as a result, each cone of a hybrid bit is unevenly
stressed, a single cone gets failed due to premature failure of its
bearing, which leads to the failure of a hybrid bit; on the other
hand, when penetrating into hard formation, the wear resistance
property of cone inserts is far lower than that of PDC cutters in a
PDC bit. In general, the wear of cone inserts leads to the failure
of hybrid bit, while in available hybrid bit, each row of cone
inserts with the same cutting trajectory is located at the same
cone, as a result, the space of a cone is partly wasted, and insert
numbers are reduced.
SUMMARY OF THE DISCLOSURE
[0004] The present disclosure provides a hybrid bit with roller
cone having inserts, the hybrid bit with roller cone having inserts
includes a bit body, a plurality of blades disposed on the bit body
and a plurality of nozzles disposed on the bit body, the blade
includes an inner cone, a nose, a shoulder and gage sections from
inside to outside, a plurality of fixed cutting elements are
mounted along the inner cone, the nose, the shoulder and the gage
sections; a head is disposed between two adjacent blades with its
upper end integrated with the bit body, and a roller cone disposed
at its lower end, the roller cone is roller cone having inserts,
and the cutting position of which corresponds to the nose and the
shoulder sections of blades, several rows of cone inserts are
arranged herein, with each row of cone inserts disposed at
intervals along a round of cone weft, and closely arranged from
inside to outside along the cutting profile envelope, with each
adjacent row of cone inserts disposed at alternate intervals along
cone meridian and the insert placement structure of each cone is
the same.
[0005] In some embodiments, a plurality of fixed cutting elements
are laid out from inside to outside at the said blades, covering
the whole bottom-hole, and forming profile envelopes of fixed
cutting elements, and gyration radiuses of all the fixed cutting
elements at each blade are different, that is, the structure of
cutter placement at each blade is different.
[0006] In some embodiments, an outermost profile envelope of the
cone inserts and the profile envelope of the fixed cutting elements
are in parallel and spaced at some intervals. The interval between
the outermost profile envelope of cone inserts herein and the
outermost profile envelope of fixed cutting elements is from -2.0
mm to 2.0 mm.
[0007] In some embodiments, a center line of inserts overlaps with
or approximates to a center line of each corresponding cutting
elements of blades when each row of cone inserts is at the lowest
point of cutting trajectory.
[0008] In some embodiments, there are two to six blades, and there
are two to six roller cones herein, and the roller cones are equal
to or less than blade numbers.
[0009] In some embodiments, the cone inserts comprise 6-20 rows of
cone inserts; each row of cone inserts comprises 6-20 cone
inserts.
[0010] In some embodiments, the said cone inserts are cemented
carbide inserts or mixed cutting elements with cemented carbide and
polycrystalline diamond.
[0011] In some embodiments, the said fixed cutting elements are
diamond cutters.
[0012] The beneficial effects of the disclosure lie in: 1. The cone
insert arrangement of each roller cone is the same, the force
distribution of the whole drill bit is balanced, which reduces
premature failure of some bearings due to excessive force caused by
uneven insert placement and improves the service life of the
drilling bit. 2. Cone inserts are in alternate, weft and meridian
arrangement, so that the inserts are not only distributed at cone
surface evenly with rational insert placement, but also the cone
space is saved more effectively, as a result, the density of insert
placement is improved, ROP of the drilling bit is developed, rock
fracture and wear resistance property of cones are improved, and
hence the service life of the drilling bit is prolonged. 3. When
each row of the cone inserts is at the lowest point of cutting
trajectory, the center line of inserts overlaps with or
approximates to the center line of each corresponding fixed cutting
elements in the blades, which leads to the rational share of
cutting and the service life of drilling bit is improved.
BRIEF DESCRIPTION OF THE ATTACHED DRAWINGS
[0013] In order to explain the exemplary embodiments of the present
invention or the technical proposal of present technologies
clearly, description of the invention briefly summarized in the
following may be had by reference to the embodiments thereof that
are illustrated in the appended drawings which form a part of this
specification. It's to be noted that, the drawings illustrated are
only some embodiments of the disclosed invention, and for ordinary
technicians of this field, other drawings can be attained without
their creative labor.
[0014] FIG. 1 shows the stereo-structure schematic diagram of a
hybrid bit with roller cone having inserts at the exemplary
embodiment in this disclosure when the bit is placed upside
down;
[0015] FIG. 2 shows the projection diagram on the outermost profile
envelopes of cone inserts and fixed cutting elements of the hybrid
bit with roller cone having inserts at the exemplary embodiment in
this disclosure;
[0016] FIG. 3 is the upward view of the hybrid bit with roller cone
having inserts at the exemplary embodiment in this disclosure.
DETAILED EMBODIMENT OF THE DISCLOSURE
[0017] In combination with the appended drawings in the exemplary
embodiments of the disclosure, the technical proposal in the
exemplary embodiments of the disclosure is described clearly and
completely. It's to be noted, however, that the drawings illustrate
only some embodiments of the disclosure and therefore are not to be
considered limiting of its scope as the disclosure may admit to
other equally effective disclosure; While the disclosure has been
shown or described in only some of its forms, it should be apparent
to those skilled in the art that it is not so limited, but is
susceptible to various changes without departing from the scope of
the disclosure. Based on the embodiments in the disclosure, all
other embodiments obtained by ordinary technicians in this field
without the premise of carrying out creative labor shall fall
within the scope of this disclosure protection.
[0018] As shown in FIG. 1 to FIG. 3, the embodiment provides a
hybrid bit with roller cone having inserts includes a bit body 101,
three blades 102 disposed on the bit body and six nozzles 103
mounted on the bit body 101. The blade102 includes the inner cone,
nose, shoulder and gage sections from the center axis of the bit to
the outside. With fixed cutting elements 104, which are PDC
cutters, mounted at each section of the blades, the fixed cutting
elements 104 at blades covering the whole bottom hole and forming
the outermost profile envelope 110 of fixed cutting elements, with
different gyration radius of each fixed cutting element at each
blade, that is, different cutting trajectory. As shown in FIG. 2
and FIG. 3, No. 1 to No. 18 fixed cutting elements are distributed
at three different blades 102a, 102b and 102c.
[0019] A head 105 is disposed between each two adjacent blades,
with its upper end welded to be integrated with the bit body, and a
journal pin disposed at its lower end, a roller cone 106 mounted
into the journal pin axially fixed with steel balls, roller cones
and blades are in alternate arrangement. Alternatively, cones are
roller cones having inserts.
[0020] There are three roller cones named as A, B and C, having
cone inserts 107 mounted, the cutting position of cone inserts
herein corresponds to the nose and shoulder sections of a blade.
There are eight rows of cone inserts, with each row of cone inserts
disposed at intervals along a round of cone weft, and closely
arranged from inside to outside along the outermost profile
envelope of cutting elements, each adjacent row of cone inserts are
in alternate, weft and meridian arrangement along the cone cutters
with the same insert placement structure at each cone.
[0021] The outermost profile envelope 111 formed by cone inserts
covers the nose and shoulder sections of the drilling bit beyond
the outside of the outermost profile envelope 110 formed by fixed
cutting elements of the said blades. The distance H between the
outermost profile envelope 111 of cone inserts and the outermost
profile envelope 110 of fixed cutting elements is 1.0 mm. When each
row of cone inserts is at the lowest point of cutting trajectory,
the center line of inserts overlaps with or approximates to the
center line of each corresponding cutting elements of blades, that
is, the center line of each row of inserts at cones 11B.about.18B
overlaps with the center line of each fixed cutting elements
11.about.18 at nose and shoulder of a blade. The outermost inserts
at the said cones cut rocks at wall of a wellbore along with the
fixed cutting elements at the gage section of blades, the cutting
trajectory of the said cone inserts overlaps with that of the said
fixed cutting elements. In addition, cutters for gage protection
are disposed at the outer diameter of a head and blade flank.
[0022] While the disclosure has been described with respect to a
limited number of embodiments, those skilled in the art, having
benefit of this disclosure, will appreciate that other embodiments
can be devised which do not depart from the scope of the invention
as disclosed herein. Accordingly, the scope of the disclosure
should be limited only by the attached claims.
* * * * *