CA2576491A1 - Threaded connection engagement and disengagement system and method - Google Patents
Threaded connection engagement and disengagement system and method Download PDFInfo
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- CA2576491A1 CA2576491A1 CA002576491A CA2576491A CA2576491A1 CA 2576491 A1 CA2576491 A1 CA 2576491A1 CA 002576491 A CA002576491 A CA 002576491A CA 2576491 A CA2576491 A CA 2576491A CA 2576491 A1 CA2576491 A1 CA 2576491A1
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- coupling
- pin
- sucker rod
- torque
- coupler
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- 238000000034 method Methods 0.000 title claims 15
- 238000010168 coupling process Methods 0.000 claims abstract 77
- 238000005859 coupling reaction Methods 0.000 claims abstract 77
- 230000008878 coupling Effects 0.000 claims abstract 73
- 210000003739 neck Anatomy 0.000 claims 22
- 230000007246 mechanism Effects 0.000 claims 10
- 238000006073 displacement reaction Methods 0.000 claims 8
- 238000004519 manufacturing process Methods 0.000 claims 7
- 230000035515 penetration Effects 0.000 claims 7
- 230000013011 mating Effects 0.000 claims 5
- 230000036316 preload Effects 0.000 claims 3
- 230000004323 axial length Effects 0.000 claims 2
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 239000000463 material Substances 0.000 claims 2
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 239000003208 petroleum Substances 0.000 claims 1
- 239000000523 sample Substances 0.000 claims 1
- 230000000717 retained effect Effects 0.000 abstract 1
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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/167—Connecting or disconnecting pipe couplings or joints using a wrench adapted to engage a non circular section of pipe, e.g. a section with flats or splines
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- 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)
- Earth Drilling (AREA)
Abstract
A system for making and breaking connections between the pin ends of sucker rods (36) and coupling sleeves (35) employs a hydraulically powered system of radially driven gripper heads (28, 29, 30) which are interchangeable to accept different sucker rod sizes. A torquering system (70) adjacent the gripper head (28, 29, 30) system is also hydraulically driven, employing a pivotally coupled free end (96) on a torque wrench (90) which engages wrench flat (37) on the sucker rod (36) at its opposite end. The coupling (35) is securely retained without marring the coupling surface while the torque necessary to make or break the connection is applied rapidly and controllably. The system can also be used to advantage to preassemble sucker rods (36) into coupling (35) with precise prestress, using an improved connection design. A sucker rod string can then be assembled readily in the field with invariant optimum prestress conditions at each connection.
Claims (37)
1. A mechanism for providing high torque to make and break connections between a coupling and a sucker rod of the type used in oil field operations, comprising;
a base block including a central recess bounded on one side by a reference plate including a central bore within the central recess, the central bore being concentric about a central axis transverse to the reference plate;
the reference plate including a set of radial guideway slots disposed at substantially equal angular spacings and intersection at the central axis at a coupling to be positioned thereat;
a set of gripping heads mounted individually in the guideway slots, a first of the gripping heads being fixed as a reference head and the others being movable in the slots;
driver mechanisms mounted in the reference plate along the radii of the guideway slots for driving the gripping heads toward a coupling about the central axis at the coupling position;
a torque driver system for engaging the wrench flat on a sucker rod that is disposed along the central axis adjacent a coupling at the coupling position, the torque driver system including a torque wrench arm radial to the central axis and including a wrench flat engaging end, a torque wrench guide disposed in a circumferential arc about the central axis and secured to the base block and configured to retain the torque wrench arm in a plane offset from a transverse plane intercepting the wrench flat; and a hydraulic drive mechanism coupled to the free end of the torque wrench arm for rotating the torque wrench arm and the sucker rod about the central axis.
a base block including a central recess bounded on one side by a reference plate including a central bore within the central recess, the central bore being concentric about a central axis transverse to the reference plate;
the reference plate including a set of radial guideway slots disposed at substantially equal angular spacings and intersection at the central axis at a coupling to be positioned thereat;
a set of gripping heads mounted individually in the guideway slots, a first of the gripping heads being fixed as a reference head and the others being movable in the slots;
driver mechanisms mounted in the reference plate along the radii of the guideway slots for driving the gripping heads toward a coupling about the central axis at the coupling position;
a torque driver system for engaging the wrench flat on a sucker rod that is disposed along the central axis adjacent a coupling at the coupling position, the torque driver system including a torque wrench arm radial to the central axis and including a wrench flat engaging end, a torque wrench guide disposed in a circumferential arc about the central axis and secured to the base block and configured to retain the torque wrench arm in a plane offset from a transverse plane intercepting the wrench flat; and a hydraulic drive mechanism coupled to the free end of the torque wrench arm for rotating the torque wrench arm and the sucker rod about the central axis.
2. A system as set forth in claim 1 above, wherein the hydraulic drive mechanism comprises a drive cylinder pivotably mounted on the base block so as to lie along a variable tangential angle circumferential to the central axis, a torque drive shaft extending along the axis of the drive cylinder and parallel to the transverse plane intercepting the wrench flat, and a pivotable head block mechanism coupling the free end of the drive shaft to the free end of the torque wrench arm.
3. A system as set forth in claim 1 above, wherein the gripping heads are interchangeable and have end arc surfaces closest to the central axis with radii of curvature mating with the outer circumference of a selected coupling, the arc spans of the end faces collectively encompassing, when engaged, a substantial majority of the circumferential dimension of the selected coupling, and the end faces defining two separate spaced apart arc segments separated by a groove that is parallel to the central axis, with the side edges of each gripping head being beveled to eliminate interference between the heads upon full closure, and wherein the system further includes compliant elements coupled to tend to draw the gripping heads away form contact with the coupling position in the absence of engagement forces.
4. A system as set forth in claim 2 above, wherein the hydraulic mechanism exerts radial forces in the range of 150,000-300,000 pounds with pressures of 3000-5000 psi, and wherein a make operation is selectively variable with either a predetermined angular displacement of the sucker rod or the application of torque to a selected limit on the sucker rod.
5. The system as set forth in claim 2 above, wherein the hydraulic drive mechanism and torque drive shaft are disposed and operate in a plane offset from the plane intercepting the wrench flat of a sucker rod, and wherein the torque wrench arm includes an angled portion compensating for the offset between planes, the torque wrench arm having a standard length with an end notch dimensioned to engage a particular size of wrench flat on the sucker rod such that different torque wrench arms are interchangeable for different sucker rod sizes.
6. An apparatus for making and breaking connections between sucker rods and sucker rod couplings, the sucker rods each having a pin end with a radial shoulder for engagement against the end of a coupling during engagement and an adjacent wrench flat for the application of torque, the apparatus comprising a reference body having substantial mass and rigidity and a central bore for receiving concentrically along a central longitudinal axis, the coupling member of a coupling/sucker rod pin end connection to be made up or broken, wherein the coupling/sucker rod connection is disposed along the central longitudinal axis within the central bore and circumferentially encompassed by the body;
a first coupling gripping member within the reference body and extending radially inwardly in a plane transverse to the longitudinal axis to the region of the coupling, the first gripping member including an arcuate engagement surface positioned for circumferentially contacting the coupling surface at a reference axial and radial position;
second and third movable gripping members radially movable relative to the central longitudinal axis at different angular positions in the plane of the first engagement member and each including an arcuate engagement surface circumferentially contacting the coupling surface;
a hydraulic system coupled to drive the second and third engagement members with selectable pressure levels toward the coupling surface, thereby to retain the coupling in substantially fixed position during the application of torque;
an elongated wrench flat engagement member disposed radially to the longitudinal central axis and into proximity to a wrench flat in an inserted coupling sucker rod connection and including a notched end configured to mate with a wrench flat, and a driven end radially spaced apart from the wrench flat;
a circumferential guide structure mounted on the reference body and about the central longitudinal axis in an intermediate region of the wrench flat engagement member, and a drive mechanism engaged to the driven end of the wrench flat engagement member for changing the material position of the wrench flat engagement member and the sucker rod to a selected displacement from its original position.
a first coupling gripping member within the reference body and extending radially inwardly in a plane transverse to the longitudinal axis to the region of the coupling, the first gripping member including an arcuate engagement surface positioned for circumferentially contacting the coupling surface at a reference axial and radial position;
second and third movable gripping members radially movable relative to the central longitudinal axis at different angular positions in the plane of the first engagement member and each including an arcuate engagement surface circumferentially contacting the coupling surface;
a hydraulic system coupled to drive the second and third engagement members with selectable pressure levels toward the coupling surface, thereby to retain the coupling in substantially fixed position during the application of torque;
an elongated wrench flat engagement member disposed radially to the longitudinal central axis and into proximity to a wrench flat in an inserted coupling sucker rod connection and including a notched end configured to mate with a wrench flat, and a driven end radially spaced apart from the wrench flat;
a circumferential guide structure mounted on the reference body and about the central longitudinal axis in an intermediate region of the wrench flat engagement member, and a drive mechanism engaged to the driven end of the wrench flat engagement member for changing the material position of the wrench flat engagement member and the sucker rod to a selected displacement from its original position.
7. The apparatus as set forth in claim 6 above, wherein the drive mechanism comprises a hydraulic cylinder rotatably mounted on the reference body, a drive position engaged to the cylinder and extending to the driven end of the wrench flat engagement member, a rotatable joint coupling the adjacent end of the drive piston to the driven end, and a pressurized hydraulic system for actuating the drive piston to torque the sucker rod to a selected displacement.
8. The apparatus as set forth in claim 7 above, wherein the hydraulic system has an adjustable pressure valve to apply controllable torque to the sucker rod.
9. An apparatus as set forth in claim 7 above, wherein the gripping members are interchangeable parts of an assembly comprising a transverse plate in the reference body with spaced apart slots radially extending at different angles from the central axis, the gripping members comprising interchangeable gripper heads slidable in the guide slots and having terminal frictional arc surfaces of selected curvatures for mating with selected coupling sizes.
10. The apparatus as set forth in claim 9 above, wherein the drive mechanism comprises a knuckle joint at the driven end of the wrench flat engagement member and wherein the wrench flat engagement member comprises an interchangeable torque arm having chosen end notches for engaging different wrench flat sizes.
11. The apparatus as set forth in claim 10 above, wherein the wrench drive arm is rotated through a selected angle in the range of from about 30° to about 90°.
12. The apparatus as set forth in claim 11 above, wherein the gripping members lie in a plane transverse to the central axis of the coupling, wherein the moveable gripper heads are radially translated relative to the central axis and wherein the gripper heads include spaced apart arced gripping surfaces circumferential to the outer periphery of the coupling, and concave separator grooves transverse to the arc curvatures for collection of particulates.
13. A method of applying high torque in making or breaking the connection between a sleeve coupling and a sucker rod used in oil field production comprising the steps of:
engaging a first arc on the outer circumference of the coupling with a frictional element at a reference axial position for the coupling;
engaging the outer circumference of the coupling at at least two other arcs with separate frictional elements;
urging the separate frictional elements radially toward the coupling axis with selected forces, and rotating a sucker rod disposed along the coupling axis with a selected torque exerted on the sucker rod wrench flat while maintaining the radial forces on the coupling.
engaging a first arc on the outer circumference of the coupling with a frictional element at a reference axial position for the coupling;
engaging the outer circumference of the coupling at at least two other arcs with separate frictional elements;
urging the separate frictional elements radially toward the coupling axis with selected forces, and rotating a sucker rod disposed along the coupling axis with a selected torque exerted on the sucker rod wrench flat while maintaining the radial forces on the coupling.
14. The method as set forth in claim 13 above, wherein the torque is applied to a sufficient level to break the connection between a sucker rod and a coupling which are initially engaged.
15. The method as set forth in claim 13 above, including the step of first threading the sucker rod into the coupler to a hand tight plane position before engaging the coupling with radial forces and then rotating the sucker rod into the coupling to a selected displacement beyond the hand tight plane to make the connection.
16. The method as set forth in claim 15 above, wherein the relative rotation between the coupling and the sucker rod is effected until a selected torque limit is reached as determined by hydraulic pressure.
17. The method as set forth in claim 15 above, wherein the relative rotation between the sucker rod and the coupling is effected through a selected angular displacement.
18. A method of providing a field-ready sucker rod to coupling connection such that final connections into a production string can be made at a production or production workover rig site to provide a sucker rod string having stable connections with long fatigue life, comprising the steps of:
preparing couplings having selected axial dimensions;
preparing sucker rods having selected shoulder to pin end face axial dimensions;
threading a prepared sucker rod into one end of a prepared coupling to a hand tight position;
further advancing the sucker rod into the coupling to a selected distance to prestress the pin neck in the sucker rod;
engaging the inserted end face of the sucker rod in the coupling with a torque element having a selected axial length between flat end faces, and repeating the sequence for other sucker rod-coupling pairs to be used in assembling a sucker rod string at a rig site.
preparing couplings having selected axial dimensions;
preparing sucker rods having selected shoulder to pin end face axial dimensions;
threading a prepared sucker rod into one end of a prepared coupling to a hand tight position;
further advancing the sucker rod into the coupling to a selected distance to prestress the pin neck in the sucker rod;
engaging the inserted end face of the sucker rod in the coupling with a torque element having a selected axial length between flat end faces, and repeating the sequence for other sucker rod-coupling pairs to be used in assembling a sucker rod string at a rig site.
19. The method as set forth in claim 19 above, wherein the step of further advancing the sucker rod includes sensing the relative axial displacement of the pin end face within the coupling.
20. A method of making a stable, long life connection between sucker rods and interconnecting couplings, comprising the steps of:
centrally assembling sucker rod-coupling pairs with predetermined prestress tensions in the pin neck regions of the pin ends, the end faces of inserted sucker rods being at a selected displacement end of the coupling;
inserting, within each assembled sucker rod-coupling pair from its open end, a load bearing element with flat end faces that are spaced apart by a selected distance into engagement with the end face of the inserted sucker rod, and at a string assembly site, connecting a sucker rod string by successively threading the pin ends of sucker rods into the available open ends of successive couplings, with the end faces of said sucker rods being brought into engagement against the proximate end face of the inserted load bearing element, such that the pin neck region of said sucker rod has substantially the same prestress tension as the adjacent sucker rod pin end.
centrally assembling sucker rod-coupling pairs with predetermined prestress tensions in the pin neck regions of the pin ends, the end faces of inserted sucker rods being at a selected displacement end of the coupling;
inserting, within each assembled sucker rod-coupling pair from its open end, a load bearing element with flat end faces that are spaced apart by a selected distance into engagement with the end face of the inserted sucker rod, and at a string assembly site, connecting a sucker rod string by successively threading the pin ends of sucker rods into the available open ends of successive couplings, with the end faces of said sucker rods being brought into engagement against the proximate end face of the inserted load bearing element, such that the pin neck region of said sucker rod has substantially the same prestress tension as the adjacent sucker rod pin end.
21. The method as set forth in claim 20 above wherein the sucker rod-coupling pairs are made up with selected advancement of the sucker rod into the coupling past the hand tight plane, and wherein the sucker rod engaged into the opposite end of the coupling is tightened after end face engagement with the load bearing element to prestress the coupling in tension in the region adjacent the load bearing element.
22. A method of making a connection between an internally threaded coupling and adjoining sucker rods having pin ends with threaded lengths terminating in end faces, adjoining pin necks, and adjacent radially surfaced shoulders, the connection also including an interior torque washer between the end faces of the pin ends threaded from opposite directions into the coupling, the method comprising the steps of:
preparing the coupling such that it has a predetermined overall length;
preparing each sucker rod pin end to establish a predetermined spacing between the end face and the radial shoulder, and a predetermined flatness on the end face in a plane transverse to the sucker rod length;
threading the pin end of the first sucker rod of a first sucker rod into the coupling from a first direction to engage the shoulder against the coupling end;
threading the pin end further into the coupling to a depth such that a predetermined preload tension stress is established in the pin neck region;
inserting a torque washer of predetermined axial dimension into the coupling, into firm abutment with the end face of the first sucker rod;
threading the pin end of a second sucker rod into the coupling from a second direction opposite to the first to hand tight engagement of the radial shoulder against the coupling end;
threading the second pin end into the coupling the further distance needed to engage the torque washer and preload tension in the second pin neck, to an extent substantially corresponding to that in the first pin neck, and further advancing the second pin end into the coupling to prestress the center region of the coupling in tension and form a structural load bearing column of the pin ends, the torque washer and the coupling that is selectively prestressed in different regions of the elements.
preparing the coupling such that it has a predetermined overall length;
preparing each sucker rod pin end to establish a predetermined spacing between the end face and the radial shoulder, and a predetermined flatness on the end face in a plane transverse to the sucker rod length;
threading the pin end of the first sucker rod of a first sucker rod into the coupling from a first direction to engage the shoulder against the coupling end;
threading the pin end further into the coupling to a depth such that a predetermined preload tension stress is established in the pin neck region;
inserting a torque washer of predetermined axial dimension into the coupling, into firm abutment with the end face of the first sucker rod;
threading the pin end of a second sucker rod into the coupling from a second direction opposite to the first to hand tight engagement of the radial shoulder against the coupling end;
threading the second pin end into the coupling the further distance needed to engage the torque washer and preload tension in the second pin neck, to an extent substantially corresponding to that in the first pin neck, and further advancing the second pin end into the coupling to prestress the center region of the coupling in tension and form a structural load bearing column of the pin ends, the torque washer and the coupling that is selectively prestressed in different regions of the elements.
23. The method as set forth in claim 22 above, wherein the depth of advancement of the first sucker rod into the coupling after the hand tight plane is measured by a depth probe from the opposite end of the coupling, wherein the first sucker rod is threaded in with torque as the coupling is held in fixed rotational position, and wherein the further advance of the second pin end into the coupling is effected by torquing in the range of 300-700 ft lbs.
24. The method of making up a long-life interconnection between sucker rods using threaded couplers, the sucker rods each having a pin end with a chamfered end face, an adjacent male threaded region, mating with the coupler thread and a radial protruding shoulder separated from the male threaded region by a pin neck of different cross-sectional dimension than the cross-section of the sucker rod body, comprising the steps of:
preparing the pin ends to provide a selected axial dimension between the end faces and the closest adjacent surface of the radial shoulder;
preparing the couplers to have a predetermined overall length;
inserting a first pin end into the coupler from a first side to engage the radial shoulder hand-tight against the associated coupler end;
further engaging the first pin into the coupler to stretch the first pin neck until (1) a selected pre-stress tension is introduced in the pin neck and (2) the end face has a selected penetration depth in the coupler;
inserting a second pin end into the coupler from the second side until the radial shoulder thereon is engaged hand-tight against the coupler end, and continuing engagement of the second pin end into the coupler until engagement with the elements appositely inserted from the other side, with the pin neck in the second pin end in pre-stress tension approximating that of the pin neck in the first pin end.
preparing the pin ends to provide a selected axial dimension between the end faces and the closest adjacent surface of the radial shoulder;
preparing the couplers to have a predetermined overall length;
inserting a first pin end into the coupler from a first side to engage the radial shoulder hand-tight against the associated coupler end;
further engaging the first pin into the coupler to stretch the first pin neck until (1) a selected pre-stress tension is introduced in the pin neck and (2) the end face has a selected penetration depth in the coupler;
inserting a second pin end into the coupler from the second side until the radial shoulder thereon is engaged hand-tight against the coupler end, and continuing engagement of the second pin end into the coupler until engagement with the elements appositely inserted from the other side, with the pin neck in the second pin end in pre-stress tension approximating that of the pin neck in the first pin end.
25. A method as set forth in claim 24 above, wherein the method further includes the steps of adjusting the length relationships to compensate for the presence of a torque element of known length, inserting a torque element of known length into the coupler against the first pin, thereafter inserting the second pin end into the coupler, engaging the second pin end to the hand-tight position, and continuing engagement until pre-stress tensions are approximately equalized in the two pin necks.
26. A method as set forth in claim 24 above, further including the step of further torquing at least one of the pin ends to pre-stress the central region of the coupler in tension.
27. A method as set forth in claim 26 above, wherein the further torquing is by applying 300-700 foot-lbs. of torque.
28. In a sucker rod combination with a coupler interconnecting a pair of oppositely directed pin ends, wherein the sucker rods each include a male threaded end region with a terminal end face, a spaced apart radial shoulder having a flat engagement surface adjacent a different cross-section pin neck intervening between the radial shoulder and the adjacent side of the male thread, and the coupling having an interior female thread matingly receiving the male threads and end surfaces for contacting the engagement surfaces of the radial shoulders on inserted pin ends, wherein the combination comprises:
the pin ends having prepared end face to engagement surface dimensions pre-selected in relation to coupler length dimensions such that oppositely inserted pin ends in the coupling stretch the pin necks to selected tension levels when threaded to a predetermined depth past hand-tight engagement of the engagement faces against the associated coupler ends, to compel engagement and lockup of the male and female threads, and concurrently placing the end faces of the pin ends in compressive pre-stress to force the central region of the coupler in tension to form a unified structure resistant to multiple loading cycles during sucker rod operation.
the pin ends having prepared end face to engagement surface dimensions pre-selected in relation to coupler length dimensions such that oppositely inserted pin ends in the coupling stretch the pin necks to selected tension levels when threaded to a predetermined depth past hand-tight engagement of the engagement faces against the associated coupler ends, to compel engagement and lockup of the male and female threads, and concurrently placing the end faces of the pin ends in compressive pre-stress to force the central region of the coupler in tension to form a unified structure resistant to multiple loading cycles during sucker rod operation.
29. A fatigue resistant connection for oil field sucker rods to be coupled together in a string, the sucker rods having pin ends terminating in an end face and having an adjacent male threaded length, the end face being separated from an exterior radial shoulder on the sucker rod by a predetermined first distance which includes a pin neck of different diameter than the sucker rod diameter, and the connection comprising:
a hollow tubular sleeve having an interior female thread mating with the threaded lengths of the pin ends, the sleeve having a second predetermined overall length relative to the first predetermined first distance;
the pin ends of oppositely inserted sucker rods in the sleeve being threaded into a penetration distance of the end faces within the sleeve greater by a chosen axial distance than the penetration of the end face at the point of engagement of the radial shoulder thereon with the sleeve end and the first and second predetermined lengths being such that at said penetration distance, both pin ends are in compressive engagement and the pin necks are pre-stressed in tension substantially equally.
a hollow tubular sleeve having an interior female thread mating with the threaded lengths of the pin ends, the sleeve having a second predetermined overall length relative to the first predetermined first distance;
the pin ends of oppositely inserted sucker rods in the sleeve being threaded into a penetration distance of the end faces within the sleeve greater by a chosen axial distance than the penetration of the end face at the point of engagement of the radial shoulder thereon with the sleeve end and the first and second predetermined lengths being such that at said penetration distance, both pin ends are in compressive engagement and the pin necks are pre-stressed in tension substantially equally.
30. A connection as set forth in claim 29 above, wherein the connection further includes a selected compressive pre-stress between the pin ends at the selected penetration distance, and wherein the first predetermined distance is established by removal of material axially from the end face of the pin end.
31. A connection as set forth in claim 30 above, wherein the connection includes a threaded torque washer of selected length between the end faces of the pin ends and the first and second predetermined lengths are selected to account for the presence of the intervening torque washer.
32. A connection as set forth in claim 30 above, wherein the end faces of the pin ends are in direct engagement and the predetermined lengths and spacings are selected to provide the desired pin neck tension and central region compression.
33. A connection for sucker rods used in strings in petroleum wells, comprising:
a pair of sucker rods each having a pin end with a shoulder ninety degrees to the longitudinal axis of the sucker rod, each pin end having an undercut stress relief pin neck area extending a predetermined axial length along the sucker rod, and at least an adjacent male threaded section with a flat transverse end face parallel to the pin end shoulder at a predetermined first dimension from the pin end shoulder;
a coupler having an interior female threaded section receiving the threaded male sections of pin ends oppositely inserted therein, wherein the shoulders on the pin ends of the sucker rods act as coupler end engagement members, and the coupler is dimensioned in length relative to the first dimension to provide calculated pin neck tension preload stresses in both sucker rods when the transverse end faces of the pin ends are in compressive engagement to a selected amount.
a pair of sucker rods each having a pin end with a shoulder ninety degrees to the longitudinal axis of the sucker rod, each pin end having an undercut stress relief pin neck area extending a predetermined axial length along the sucker rod, and at least an adjacent male threaded section with a flat transverse end face parallel to the pin end shoulder at a predetermined first dimension from the pin end shoulder;
a coupler having an interior female threaded section receiving the threaded male sections of pin ends oppositely inserted therein, wherein the shoulders on the pin ends of the sucker rods act as coupler end engagement members, and the coupler is dimensioned in length relative to the first dimension to provide calculated pin neck tension preload stresses in both sucker rods when the transverse end faces of the pin ends are in compressive engagement to a selected amount.
34. A connection as set forth in claim 33 above, wherein each pin end has a pre-selected axial penetration in the coupler to a chosen displacement of the pin end beyond hand-tight engagement at pin shoulder to the adjacent coupler end, and wherein the pin neck tensions in the two pin ends are substantially equal.
35. A connection as set forth in claim 34 above, wherein the connection includes a further makeup stress in the central region of the coupler after the pre-selected axial penetration of the pin end, increasing compression between the pin ends in the mid-region of the coupler.
36. A connection as set forth in claim 35 above, wherein the calculated pin shoulder to coupler end face contact pressure, calculated pin neck undercut area tension pre-stress, calculated compressional loading of pin end faces compressive pre-stress in the mid-region of the coupler, act to lock the mating threads and limit fatigue failure of the coupler under repeated cyclic loading.
37. A connection as set forth in claim 36 above, further including a threaded torque washer positioned in the coupler between the end faces of the pin ends, and the first dimensions of the pin ends and the length dimensions of the coupler are selected to allow for the presence of the torque washer.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2004/024373 WO2006022652A1 (en) | 2004-08-12 | 2004-08-12 | Threaded connection engagement and disengagement system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2576491A1 true CA2576491A1 (en) | 2006-03-02 |
| CA2576491C CA2576491C (en) | 2011-11-08 |
Family
ID=35967763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2576491A Expired - Lifetime CA2576491C (en) | 2004-08-12 | 2004-08-12 | Threaded connection engagement and disengagement system and method |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2576491C (en) |
| WO (1) | WO2006022652A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8721815B2 (en) | 2010-08-09 | 2014-05-13 | Centrax International Corp. | Methods and systems for assembly of fiberglass reinforced sucker rods |
| CN113770673A (en) * | 2021-09-14 | 2021-12-10 | 浙江精锐智能传动有限公司 | Device for automatically assembling flange plate and shaft sleeve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3802057A (en) * | 1970-09-24 | 1974-04-09 | Robbins J Ass Inc | Method for loosening threaded pipe connections using an earth drilling machine |
| US6374706B1 (en) * | 2001-01-25 | 2002-04-23 | Frederic M. Newman | Sucker rod tool |
-
2004
- 2004-08-12 CA CA2576491A patent/CA2576491C/en not_active Expired - Lifetime
- 2004-08-12 WO PCT/US2004/024373 patent/WO2006022652A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CA2576491C (en) | 2011-11-08 |
| WO2006022652A1 (en) | 2006-03-02 |
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