CA2630086A1 - Shear coupling assembly with backoff prevention - Google Patents
Shear coupling assembly with backoff prevention Download PDFInfo
- Publication number
- CA2630086A1 CA2630086A1 CA 2630086 CA2630086A CA2630086A1 CA 2630086 A1 CA2630086 A1 CA 2630086A1 CA 2630086 CA2630086 CA 2630086 CA 2630086 A CA2630086 A CA 2630086A CA 2630086 A1 CA2630086 A1 CA 2630086A1
- Authority
- CA
- Canada
- Prior art keywords
- coupling member
- counterbore
- shear
- insert
- top portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000008878 coupling Effects 0.000 title claims abstract 45
- 238000010168 coupling process Methods 0.000 title claims abstract 45
- 238000005859 coupling reaction Methods 0.000 title claims abstract 45
- 230000002265 prevention Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims 4
- 239000000853 adhesive Substances 0.000 claims 2
- 230000001070 adhesive effect Effects 0.000 claims 2
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/06—Releasing-joints, e.g. safety joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/043—Threaded with locking means
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Pivots And Pivotal Connections (AREA)
Abstract
A shear coupling assembly utilizes a novel pin coupling member having radial slots formed about a top portion of the insert member, the top portion being radially expandable once engaged in the box coupling member to lockingly engage the threaded connection. Locking of the insert member in the box coupling member prevents backing-off of the connection and maintains a pretension in the neck of the pin coupling member, during use. The top portion of the insert can be radially expanded by forcing a ball bearing into a counterbore formed in the insert member.
Claims (20)
1. A pin coupling member for a shear coupling assembly adapted for connecting a downhole pump to a downhole end of a rod string, the pin coupling member comprising:
a cylindrical body;
a cylindrical insert member extending axially outwardly from the cylindrical body and having an externally threaded surface adapted to engage an internally threaded axial bore of a box coupling member of the shear coupling assembly;
a shear neck connecting between the cylindrical body and the insert member;
a counterbore formed in the insert member; and two or more radial discontinuities formed in a top portion of the insert member being of sufficient axial depth for permitting the top of the insert member to flex radially outwardly in response to a substantially radial force applied to the counterbore for lockingly engaging the threaded connection between the pin coupling member and the box coupling member.
a cylindrical body;
a cylindrical insert member extending axially outwardly from the cylindrical body and having an externally threaded surface adapted to engage an internally threaded axial bore of a box coupling member of the shear coupling assembly;
a shear neck connecting between the cylindrical body and the insert member;
a counterbore formed in the insert member; and two or more radial discontinuities formed in a top portion of the insert member being of sufficient axial depth for permitting the top of the insert member to flex radially outwardly in response to a substantially radial force applied to the counterbore for lockingly engaging the threaded connection between the pin coupling member and the box coupling member.
2. The pin coupling member of claim 1 wherein the two or more discontinuities are slots.
3. The pin coupling member of claim 1 wherein the two or more radial discontinuities are orthogonal discontinuities spaced about a circumference of the top portion of the insert.
4. The pin coupling member of claim 1 wherein the two or more radial discontinuities are three slots spaced evenly about a circumference of the top portion of the insert member.
5. The pin coupling member of any one of claims 1 to 4 wherein the counterbore is adapted to accept an expansion member for applying the force to the counterbore.
6. The pin coupling member of any one of claims 1 to 5 wherein the shear neck has a section reduced in cross-section compared to the insert member.
7. A shear coupling assembly adapted for connecting between a downhole pump and a downhole end of a rod string, comprising:
a box coupling member having a tubular body; and an internally threaded axial bore formed therethrough; and a pin coupling member having a cylindrical body;
a cylindrical insert member extending axially outwardly from the cylindrical body and having an externally threaded surface for engaging the internally threaded axial bore of the box coupling member;
a shear neck connecting between the cylindrical body and the insert member;
a counterbore formed in the insert member; and two or more radial discontinuities formed in a top portion of the insert member and being of sufficient depth for permitting radially outward flexing of the top portion in response to a force applied to the counterbore for lockingly engaging the threaded connection between the pin coupling member and the box coupling member.
a box coupling member having a tubular body; and an internally threaded axial bore formed therethrough; and a pin coupling member having a cylindrical body;
a cylindrical insert member extending axially outwardly from the cylindrical body and having an externally threaded surface for engaging the internally threaded axial bore of the box coupling member;
a shear neck connecting between the cylindrical body and the insert member;
a counterbore formed in the insert member; and two or more radial discontinuities formed in a top portion of the insert member and being of sufficient depth for permitting radially outward flexing of the top portion in response to a force applied to the counterbore for lockingly engaging the threaded connection between the pin coupling member and the box coupling member.
8. The shear coupling assembly of claim 7 further comprising:
an expansion member, wherein the expansion member forces the top portion radially outward.
an expansion member, wherein the expansion member forces the top portion radially outward.
9. The shear coupling assembly of claim 8 wherein the expansion member is forced into the counterbore for flexing the top portion radially outward.
10. The shear coupling assembly of claim 8 or 9 wherein the expansion member is a sphere having a diameter larger than a diameter of the counterbore.
11. The shear coupling assembly of claim 10 wherein the sphere is a ball bearing.
12. The shear coupling assembly of claim 10 or 11 wherein the sphere is inserted into the counterbore until a major diameter of the sphere is below a top face of the insert member.
13. The shear coupling assembly of any one of claims 8 to 12 further comprising a chamfer formed about an opening to the counterbore for easing the expansion member into the counterbore.
14. The shear coupling assembly of any one of claims 7 to 13 wherein the two or more radial discontinuities are orthogonal slots spaced about a circumference of the top portion of the insert.
15. The shear coupling assembly of any one of claims 7 to 13 wherein the two or more discontinuities are three slots spaced evenly about a circumference of the top portion of the insert member.
16. The shear coupling assembly of any one of claims 7 to 13 wherein the shear neck has a section reduced in cross-section compared to the insert member.
17. A method of assembling a shear coupling assembly comprising:
threading an insert member of a pin coupling member into a threaded axial bore of a box coupling member, the insert member having a counterbore and two or more radial discontinuities spaced about a top portion for permitting outward radial expansion of the top portion;
applying pretension to a neck of the pin coupling member during the threading of the box coupling member to seat on the pin coupling member;
and thereafter inserting an expansion member into the counterbore for expanding the top portion of the insert member radially outward within the axial bore of the box coupling member for lockingly engaging the threaded connection therebetween.
threading an insert member of a pin coupling member into a threaded axial bore of a box coupling member, the insert member having a counterbore and two or more radial discontinuities spaced about a top portion for permitting outward radial expansion of the top portion;
applying pretension to a neck of the pin coupling member during the threading of the box coupling member to seat on the pin coupling member;
and thereafter inserting an expansion member into the counterbore for expanding the top portion of the insert member radially outward within the axial bore of the box coupling member for lockingly engaging the threaded connection therebetween.
18. The method of claim 17 wherein the expansion member is a sphere having a diameter larger than the counterbore, the inserting the expansion member further comprising:
applying a downward force to the sphere for forcing the sphere into the counterbore.
applying a downward force to the sphere for forcing the sphere into the counterbore.
19 19. The method of claim 17 or 18 further comprising:
prior to threading the insert member into the axial bore of the box coupling member, applying a thread-locking adhesive to the externally threaded insert member.
prior to threading the insert member into the axial bore of the box coupling member, applying a thread-locking adhesive to the externally threaded insert member.
20. The method of claim 17 or 18 wherein the pin coupling member further comprises a radial contact shoulder formed about a top of the cylindrical body further comprising, prior to threading the insert member into the axial bore:
applying a thread-locking adhesive to the externally threaded insert member and the radial contact shoulder; and threading the insert member into the axial bore of a box coupling member until a bottom of the box coupling member contacts the radial contact shoulder of the pin coupling member.
applying a thread-locking adhesive to the externally threaded insert member and the radial contact shoulder; and threading the insert member into the axial bore of a box coupling member until a bottom of the box coupling member contacts the radial contact shoulder of the pin coupling member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2630086 CA2630086C (en) | 2008-04-29 | 2008-04-29 | Shear coupling assembly with backoff prevention |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2630086 CA2630086C (en) | 2008-04-29 | 2008-04-29 | Shear coupling assembly with backoff prevention |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2630086A1 true CA2630086A1 (en) | 2009-10-29 |
| CA2630086C CA2630086C (en) | 2011-08-16 |
Family
ID=41255939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2630086 Expired - Fee Related CA2630086C (en) | 2008-04-29 | 2008-04-29 | Shear coupling assembly with backoff prevention |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2630086C (en) |
-
2008
- 2008-04-29 CA CA 2630086 patent/CA2630086C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2630086C (en) | 2011-08-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20180430 |