US20080066901A1 - Box end sucker rod shear coupling - Google Patents
Box end sucker rod shear coupling Download PDFInfo
- Publication number
- US20080066901A1 US20080066901A1 US11/533,307 US53330706A US2008066901A1 US 20080066901 A1 US20080066901 A1 US 20080066901A1 US 53330706 A US53330706 A US 53330706A US 2008066901 A1 US2008066901 A1 US 2008066901A1
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- United States
- Prior art keywords
- sucker rod
- rod
- coupling
- threads
- box
- 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.)
- Abandoned
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- 230000008878 coupling Effects 0.000 title claims abstract description 62
- 238000010168 coupling process Methods 0.000 title claims abstract description 62
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 2
- 230000000712 assembly Effects 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 11
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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
- E21B17/042—Threaded
- E21B17/0423—Threaded with plural threaded sections, e.g. with two-step threads
-
- 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
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D9/00—Couplings with safety member for disconnecting, e.g. breaking or melting member
- F16D9/06—Couplings with safety member for disconnecting, e.g. breaking or melting member by breaking due to shear stress
- F16D9/08—Couplings with safety member for disconnecting, e.g. breaking or melting member by breaking due to shear stress over a single area encircling the axis of rotation, e.g. shear necks on shafts
Definitions
- Rotary sucker rod shears have long been used downhole for preventing damage to rod strings. These rod shears fail at a predesignated load. This controlled rupture prevents the sucker rod string from exposure to excessive force from the service rig driving the string.
- FIGS. 1A , 1 B, and 1 C A traditional rod shear 100 is shown in FIGS. 1A , 1 B, and 1 C.
- FIG. 1A shows a cross-sectional view of the rod shear 100 .
- FIG. 1B shows the rod shear 100 from the box end 102 .
- FIG. 1B shows the rod shear 100 from the pin end 104 .
- the traditional rod shear's components include a box component 101 having a box (female) end 102 and a pin component 103 having a pin (male) end 104 .
- the box end 102 has threads 106 on an interior circumference 108 and the pin end 104 has threads 110 on exterior circumference 1 12 .
- the pin component 101 is inserted within the box component 103 , so that the box end 102 and the pin end 104 are at opposing ends of the assembled rod shear.
- the components 101 , 103 of the assembled rod shear 100 are coupled together by one or more transverse shear pins 120 , which function as a failure element.
- the traditional rod shear 100 is used in a traditional rotary sucker rod assembly 200 , shown in FIG. 2A .
- the rotary sucker rod assembly 200 includes a rig 202 which drives the sucker rod string 204 , which is typically a series of several single rods 220 , 222 , 224 , 226 coupled together.
- the sucker rod string 204 serves as a mechanical link from the rig 202 on the surface to the sucker rod pump 230 near the bottom of the well.
- FIG. 2B shows an upper sucker rod 224 coupled to a lower sucker rod 226 .
- Sucker rod 224 is a single unit having a box (female) end 250 and a pin (male) end 260 .
- Sucker rod 226 is a single unit having a box (female) end 251 and a pin (male) end 261 .
- the individual sucker rods 220 , 222 , 224 , 226 in the rod string 204 are oriented with the pin end 260 , 261 down.
- the box end 250 has threads 252 on an interior circumference 254 for engaging the pin end of the sucker rod above, and the pin end 260 has threads 262 on an exterior circumference 264 for engaging the box end 251 of the sucker rod below 226 .
- the pin end 261 of the lowest sucker rod 226 in the rod string 204 is coupled to the rod shear 100 , as shown in FIG.
- the sucker rod pump 240 shown alone in FIG. 2D , has a pump pin 242 that connects the sucker rod pump 240 to the remainder of the rotary sucker rod assembly 200 .
- the pump pin 242 and the rod shear 100 are connected by a coupling 244 having two opposing box ends 246 , 248 , shown in FIG. 2E .
- the upper box end 246 is coupled to the pin end 104 of the rod shear 100
- the lower box end 248 is coupled to the pump pin 242 .
- the traditional rotary sucker rod shear design has several shortcomings. Often, the pump attached to the rod string is a progressive cavity pump (PCP). The length of the traditional rod shear, being a stiff member, exasperates the eccentric motion of the pump's rotor, which leads to premature sucker rod fatigue failures. Further, the length of the traditional rod shear requires more material than a shorter length, which increases costs. A current solution is a shorter rod shear using the same general design. However, the traditional rod shear design requires a certain length in order to accommodate the shearing pin elements and the box-pin thread combination. Thus, even the shorter rod shear is longer than desirable.
- PCP progressive cavity pump
- pin end-box end design Another of the traditional design's shortcomings is its pin end-box end design.
- This design necessitates an additional component, the coupling, in order to connect the shear to the pump pin.
- the additional component further increases the cost of the sucker rod assembly and the complexity of the sucker rod assembly's installation.
- the pin end threads of the pin-end-box end design are easily damaged by mishandling, which can lead to seized threads upon field installation.
- rotary sucker rod shear designs which address one or more of the shortcomings of the current rotary sucker rod shear design.
- box-end rotary sucker rod shear couplings including a substantially cylindrical housing having an upper end; a lower end; an interior surface defining a passage from the upper end to the lower end along a longitudinal axis of the cylindrical housing; and an exterior surface.
- the shear coupling typically includes a first set of threads around an inner circumference of the upper end for receiving a rotary sucker rod coupled directly into the upper end of the passage without an intervening adaptor; a second set of threads around an inner circumference of the lower end for receiving a pump pin coupled directly into the lower end of the passage without an intervening adaptor; and one or more circumferential grooves machined into the cylindrical housing between the threads for causing rod shear failure at a predetermined axial load.
- the rotary sucker rod has complementary threads on an outer circumference for engaging the rod shear coupling
- the pump pin has complementary threads on an outer circumference for engaging the rod shear coupling.
- the shear couplings are a conventional box-end sucker rod coupling. Also disclosed are rotary sucker rod assemblies including such rod shear couplings.
- FIGS. 1A-C illustrate a prior art rod shear.
- FIGS. 2A-E illustrate a prior art rotary sucker rod assembly.
- FIGS. 3A-C show a rotary sucker rod shear coupling.
- FIG. 4 shows a rod shear coupling in a rotary sucker rod assembly.
- FIGS. 5A-C illustrate the rod shear coupling coupled to a lowest sucker rod in the rod string and to a pump.
- FIGS. 3A-D show a rotary sucker rod shear coupling 300 for use with a rotary sucker rod string in a rotary sucker rod assembly.
- FIG. 3A shows the rod shear coupling 300 from a perspective view.
- FIG. 3B shows the rod shear coupling 300 from a cross sectional view along its longitudinal axis.
- FIG. 3C shows the rod shear coupling 300 from a cross sectional view across its longitudinal axis.
- FIG. 3D shows the rod shear coupling 300 from an end view.
- the rotary sucker rod shear coupling 300 includes a substantially cylindrical housing 302 having an interior surface 306 defining a passage 310 along the longitudinal axis of the housing 308 and an exterior surface 304 .
- housing 302 is typically cylindrical, in various embodiments the housing 302 may be implemented as one of a multitude of various oblong shapes adapted for downhole insertion within a well and having cross sections that may be circular or polygonal (e.g., hexagonal, octagonal), and which may change along the longitudinal axis. Substantially cylindrical is defined here to encompass all such housing designs.
- the passage 310 extends from the upper end 312 of the rod shear coupling 300 to the lower end 314 of the rod shear coupling 300 , so that the passage 310 is in fluid communication with the area above the rod shear coupling 316 and the area below the rod shear coupling 318 .
- the interior surface includes a first set of threads 320 around an inner circumference 322 of the upper end 312 adapted for receiving a rotary sucker rod coupled directly into the upper end 312 of the rod shear coupling 300 without an intervening adaptor, and a second set of threads 324 around an inner circumference 328 of the lower end 314 for receiving a pump pin coupled directly into the lower end of the rod shear coupling 300 without an intervening adaptor.
- the housing 302 of the rod shear coupling 300 may be a conventional box-end sucker rod coupling.
- the conventional box-end sucker rod coupling is produced using standard manufacturing processes, resulting in a much lower cost than the traditional shear rod 1 00 .
- the rod shear coupling 300 of FIG. 3A has one or more circumferential grooves 330 machined into the interior surface 306 of the housing 302 between the threads 320 , 324 .
- the circumferential grooves 330 are located in the exterior surface 304 ( FIG. 3E ) or the interior surface 304 and the exterior surface 306 ( FIG. 3F ).
- grooves 330 in the interior and exterior surface 304 , 306 are aligned. By aligned, it is meant that a portion of an interior groove circumscribes a portion of an exterior groove within a plane.
- the one or more circumferential grooves 330 weaken the rod shear coupling 300 , causing failure of the rod shear coupling 300 at a predetermined axial load, which is lower by a margin of safety than the axial load estimated to damage the sucker rod string.
- the rod shear coupling 300 is used in a rotary sucker rod assembly 400 , shown in FIG. 4 .
- the rotary sucker rod assembly 400 includes a rig 202 which drives the sucker rod string 204 composed of several single rods 220 , 222 , 224 , 226 oriented with the pin end 260 down and screwed together.
- the pin end 261 of the lowest sucker rod 226 in the rod string 204 is coupled to the rod shear coupling 300 with the first set of threads 320 of the rod shear coupling 300 being engaged with the threads 262 on the exterior circumference 264 of the lowest sucker rod's pin end 261 .
- the second set of threads 324 around the inner circumference 326 of the rod shear coupling's 300 lower end 314 engages threads 241 on the exterior of the pump pin 242 to couple the rod shear coupling 300 to the pump pin 242 .
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Box-end rotary sucker rod shear couplings including a substantially cylindrical housing having an interior surface defining a passage from an upper end to a lower end along a longitudinal axis and an exterior surface. The shear coupling also includes a set of threads around an inner circumference of the upper end for receiving a rotary sucker rod coupled directly into the upper end of the passage without an intervening adaptor; a set of threads around an inner circumference of the lower end for receiving a pump pin coupled directly into the lower end of the passage without an intervening adaptor; and one or more circumferential grooves machined into the cylindrical housing between the threads for causing rod shear failure at a predetermined axial load. In some embodiments, the shear couplings are conventional box-end sucker rod couplings. Also disclosed are rotary sucker rod assemblies including such rod shear couplings.
Description
- Rotary sucker rod shears have long been used downhole for preventing damage to rod strings. These rod shears fail at a predesignated load. This controlled rupture prevents the sucker rod string from exposure to excessive force from the service rig driving the string.
- A
traditional rod shear 100 is shown inFIGS. 1A , 1B, and 1C.FIG. 1A shows a cross-sectional view of therod shear 100.FIG. 1B shows therod shear 100 from thebox end 102.FIG. 1B shows therod shear 100 from thepin end 104. The traditional rod shear's components include abox component 101 having a box (female)end 102 and apin component 103 having a pin (male)end 104. Thebox end 102 hasthreads 106 on aninterior circumference 108 and thepin end 104 hasthreads 110 on exterior circumference 1 12. Thepin component 101 is inserted within thebox component 103, so that the box end 102 and thepin end 104 are at opposing ends of the assembled rod shear. Thecomponents rod shear 100 are coupled together by one or moretransverse shear pins 120, which function as a failure element. - The
traditional rod shear 100 is used in a traditional rotarysucker rod assembly 200, shown inFIG. 2A . The rotarysucker rod assembly 200 includes arig 202 which drives thesucker rod string 204, which is typically a series of severalsingle rods sucker rod string 204 serves as a mechanical link from therig 202 on the surface to thesucker rod pump 230 near the bottom of the well.FIG. 2B shows anupper sucker rod 224 coupled to alower sucker rod 226. Suckerrod 224 is a single unit having a box (female)end 250 and a pin (male)end 260. Suckerrod 226 is a single unit having a box (female)end 251 and a pin (male)end 261. Generally, theindividual sucker rods rod string 204 are oriented with thepin end box end 250 hasthreads 252 on aninterior circumference 254 for engaging the pin end of the sucker rod above, and thepin end 260 hasthreads 262 on anexterior circumference 264 for engaging thebox end 251 of the sucker rod below 226. Thepin end 261 of thelowest sucker rod 226 in therod string 204 is coupled to therod shear 100, as shown inFIG. 2C , by engaging the threads 263 on theexterior circumference 265 of the lowest sucker rod'spin end 261 with thethreads 106 on the interior of thebox end 102 of therod shear 100. Thesucker rod pump 240, shown alone inFIG. 2D , has apump pin 242 that connects thesucker rod pump 240 to the remainder of the rotarysucker rod assembly 200. In a traditional rotarysucker rod assembly 200, thepump pin 242 and therod shear 100 are connected by acoupling 244 having twoopposing box ends FIG. 2E . Theupper box end 246 is coupled to thepin end 104 of therod shear 100, while thelower box end 248 is coupled to thepump pin 242. - During operation, rotational force from the rig is transmitted through the
rod string 204 to thebox component 101 of therod shear 100. If the shear pins have not failed, thebox component 101 of therod shear 100 transmits rotational force to thepin component 103 of therod shear 100, and, eventually, to the pump pin, thereby operating the pump. If the axial load exceeds the predetermined limit for which the shear pin is designed, the shear pin fails, and thebox component 101 of therod shear 100 spins harmlessly around thepin component 103 of therod shear 100. Failure of the shear pin severs the mechanical link, thereby eliminating the load and preserving the other components of the assembly. - The traditional rotary sucker rod shear design has several shortcomings. Often, the pump attached to the rod string is a progressive cavity pump (PCP). The length of the traditional rod shear, being a stiff member, exasperates the eccentric motion of the pump's rotor, which leads to premature sucker rod fatigue failures. Further, the length of the traditional rod shear requires more material than a shorter length, which increases costs. A current solution is a shorter rod shear using the same general design. However, the traditional rod shear design requires a certain length in order to accommodate the shearing pin elements and the box-pin thread combination. Thus, even the shorter rod shear is longer than desirable.
- Historically, rotary sucker rod shears have been specially manufactured by fabricating the individual components of the rod shear, assembling them, and then testing the assembled rod shear. This complex, multi-step manufacturing process is relatively expensive. Thus, another shortcoming of the traditional rod shear is the high cost associated with its manufacture.
- Another of the traditional design's shortcomings is its pin end-box end design. This design necessitates an additional component, the coupling, in order to connect the shear to the pump pin. The additional component further increases the cost of the sucker rod assembly and the complexity of the sucker rod assembly's installation. Further, the pin end threads of the pin-end-box end design are easily damaged by mishandling, which can lead to seized threads upon field installation.
- Disclosed herein are rotary sucker rod shear designs which address one or more of the shortcomings of the current rotary sucker rod shear design.
- Disclosed herein are box-end rotary sucker rod shear couplings including a substantially cylindrical housing having an upper end; a lower end; an interior surface defining a passage from the upper end to the lower end along a longitudinal axis of the cylindrical housing; and an exterior surface. The shear coupling typically includes a first set of threads around an inner circumference of the upper end for receiving a rotary sucker rod coupled directly into the upper end of the passage without an intervening adaptor; a second set of threads around an inner circumference of the lower end for receiving a pump pin coupled directly into the lower end of the passage without an intervening adaptor; and one or more circumferential grooves machined into the cylindrical housing between the threads for causing rod shear failure at a predetermined axial load. Typically, the rotary sucker rod has complementary threads on an outer circumference for engaging the rod shear coupling, and the pump pin has complementary threads on an outer circumference for engaging the rod shear coupling. In some embodiments, the shear couplings are a conventional box-end sucker rod coupling. Also disclosed are rotary sucker rod assemblies including such rod shear couplings.
-
FIGS. 1A-C illustrate a prior art rod shear. -
FIGS. 2A-E illustrate a prior art rotary sucker rod assembly. -
FIGS. 3A-C show a rotary sucker rod shear coupling. -
FIG. 4 shows a rod shear coupling in a rotary sucker rod assembly. -
FIGS. 5A-C illustrate the rod shear coupling coupled to a lowest sucker rod in the rod string and to a pump. - Disclosed herein are box-end rotary sucker rod shear couplings. Specific design details have been provided for illustration but should not be considered limiting. Readers of skill in the art will recognize that many variations of sucker rod shear couplings may be implemented consistent with the scope of the invention as described by the appended claims.
-
FIGS. 3A-D show a rotary suckerrod shear coupling 300 for use with a rotary sucker rod string in a rotary sucker rod assembly.FIG. 3A shows therod shear coupling 300 from a perspective view.FIG. 3B shows therod shear coupling 300 from a cross sectional view along its longitudinal axis.FIG. 3C shows therod shear coupling 300 from a cross sectional view across its longitudinal axis.FIG. 3D shows therod shear coupling 300 from an end view. The rotary suckerrod shear coupling 300 includes a substantiallycylindrical housing 302 having aninterior surface 306 defining apassage 310 along the longitudinal axis of thehousing 308 and anexterior surface 304. Although thehousing 302 is typically cylindrical, in various embodiments thehousing 302 may be implemented as one of a multitude of various oblong shapes adapted for downhole insertion within a well and having cross sections that may be circular or polygonal (e.g., hexagonal, octagonal), and which may change along the longitudinal axis. Substantially cylindrical is defined here to encompass all such housing designs. - The
passage 310 extends from theupper end 312 of therod shear coupling 300 to thelower end 314 of therod shear coupling 300, so that thepassage 310 is in fluid communication with the area above therod shear coupling 316 and the area below therod shear coupling 318. Although other configurations may be used, in a preferred embodiment, the interior surface includes a first set ofthreads 320 around an inner circumference 322 of theupper end 312 adapted for receiving a rotary sucker rod coupled directly into theupper end 312 of therod shear coupling 300 without an intervening adaptor, and a second set ofthreads 324 around aninner circumference 328 of thelower end 314 for receiving a pump pin coupled directly into the lower end of therod shear coupling 300 without an intervening adaptor. Thehousing 302 of therod shear coupling 300 may be a conventional box-end sucker rod coupling. The conventional box-end sucker rod coupling is produced using standard manufacturing processes, resulting in a much lower cost than the traditional shear rod 1 00. - The
rod shear coupling 300 ofFIG. 3A has one or morecircumferential grooves 330 machined into theinterior surface 306 of thehousing 302 between thethreads FIGS. 3E and 3F , thecircumferential grooves 330 are located in the exterior surface 304 (FIG. 3E ) or theinterior surface 304 and the exterior surface 306 (FIG. 3F ). In the embodiment ofFIG. 3F ,grooves 330 in the interior andexterior surface circumferential grooves 330 weaken therod shear coupling 300, causing failure of therod shear coupling 300 at a predetermined axial load, which is lower by a margin of safety than the axial load estimated to damage the sucker rod string. - The
rod shear coupling 300 is used in a rotarysucker rod assembly 400, shown inFIG. 4 . Similarly to the traditional rotarysucker rod assembly 200, the rotarysucker rod assembly 400 includes arig 202 which drives thesucker rod string 204 composed of severalsingle rods pin end 260 down and screwed together. - Upon installation, shown in
FIG. 5A , thepin end 261 of thelowest sucker rod 226 in therod string 204 is coupled to therod shear coupling 300 with the first set ofthreads 320 of therod shear coupling 300 being engaged with thethreads 262 on theexterior circumference 264 of the lowest sucker rod'spin end 261. The second set ofthreads 324 around theinner circumference 326 of the rod shear coupling's 300lower end 314 engages threads 241 on the exterior of thepump pin 242 to couple therod shear coupling 300 to thepump pin 242. - It should be understood that the invention concepts disclosed herein are capable of many modifications. Such modifications may include, but are not limited to the number, shape, and configuration of the grooves machined into the rod shear coupling, modifications in the threads, the method of machining grooves, the materials from which the rod shear coupling is made, and the method for manufacturing the rod shear coupling. To the extent such modifications fall within the scope of the appended claims and their equivalents, they are intended to be covered by this patent.
Claims (11)
1. A box-end rotary sucker rod shear coupling comprising:
a substantially cylindrical housing having
an upper end;
a lower end;
an interior surface defining a passage from the upper end to the lower end along a longitudinal axis of the substantially cylindrical housing;
an exterior surface;
a first set of threads around an inner circumference of the upper end adapted to directly receive a rotary sucker rod without an intervening adaptor, the rotary sucker rod having complementary threads on an outer circumference for engaging the rod shear coupling;
a second set of threads around an inner circumference of the lower end adapted to directly receive a pump pin without an intervening adaptor, the pump pin having complementary threads on an outer circumference for engaging the rod shear coupling; and
one or more circumferential grooves machined into the cylindrical housing between the threads so as to cause rod shear failure at a predetermined load.
2. The rod shear coupling of claim 1 wherein the one or more circumferential grooves in the cylindrical housing between the threads comprise at least one circumferential groove in the interior surface.
3. The rod shear coupling of claim 1 wherein the one or more circumferential grooves in the cylindrical housing between the threads comprise at least one circumferential groove in the exterior surface.
4. The rod shear coupling of claim 1 wherein the one or more circumferential grooves comprise at least one circumferential groove in the exterior surface and at least one circumferential groove in the interior surface.
5. The rod shear coupling of claim 4 wherein at least one circumferential groove in the interior surface is aligned with at least one circumferential groove in the interior surface.
6. The box-end rotary sucker rod shear coupling of claims 1 -5 wherein the cylindrical housing comprises a conventional box-end sucker rod coupling.
7. A rotary sucker rod assembly comprising a box-end rotary sucker rod shear coupling according to any of claims 1 -5.
8. A method for manufacturing a box-end sucker rod shear coupling, the method comprising:
providing a conventional box-end sucker rod coupling having an elongated body having
an upper end;
a lower end;
an interior surface defining a passage from the upper end to the lower end along a longitudinal axis of the body;
an exterior surface;
a first set of threads at the upper end adapted to directly receive a sucker rod; and
a second set of threads at the lower end adapted to directly receive a pump pin; and
machining one or more circumferential grooves in the box-end sucker rod coupling between the first set of threads and the second set of threads.
9. The method of claim 8 wherein the one or more circumferential grooves are machined in the interior surface of the box-end sucker rod coupling.
10. The method of claim 9 wherein the one or more circumferential grooves are machined in the exterior surface of the box-end sucker rod coupling.
11. The method of claim 8 wherein the one or more circumferential grooves are machined in the exterior surface of the box-end sucker rod coupling.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/533,307 US20080066901A1 (en) | 2006-09-19 | 2006-09-19 | Box end sucker rod shear coupling |
CA002601152A CA2601152A1 (en) | 2006-09-19 | 2007-09-11 | Box end sucker rod shear coupling |
GB0717917A GB2442111A (en) | 2006-09-19 | 2007-09-14 | Sucker rod shear coupling with shear groove |
NO20074791A NO20074791L (en) | 2006-09-19 | 2007-09-19 | Boksendepumpestangskjaerkobling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/533,307 US20080066901A1 (en) | 2006-09-19 | 2006-09-19 | Box end sucker rod shear coupling |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080066901A1 true US20080066901A1 (en) | 2008-03-20 |
Family
ID=38658938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/533,307 Abandoned US20080066901A1 (en) | 2006-09-19 | 2006-09-19 | Box end sucker rod shear coupling |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080066901A1 (en) |
CA (1) | CA2601152A1 (en) |
GB (1) | GB2442111A (en) |
NO (1) | NO20074791L (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2472861A (en) * | 2009-08-24 | 2011-02-23 | Dynamic Dinosaurs Bv | A threaded pipe connector of reduced bending stiffness |
US20110073318A1 (en) * | 2009-09-30 | 2011-03-31 | Conocophillips Company | Producing gas and liquid from below a permanent packer in a hydrocarbon well |
US20110150596A1 (en) * | 2009-12-17 | 2011-06-23 | Weatherford/Lamb, Inc. | Shear coupling assembly for use with rotary and reciprocating pumps |
US9605493B2 (en) | 2014-06-23 | 2017-03-28 | Arthur W. Lauder | Downhole coupling |
CN113445991A (en) * | 2021-06-24 | 2021-09-28 | 中油智采(天津)科技有限公司 | Artificial intelligence single-machine multi-well oil pumping machine monitoring method, system and storage medium |
US20210310511A1 (en) * | 2020-04-01 | 2021-10-07 | Hubbell Incorporated | Breakaway threaded fasteners and electrical connectors having such fasteners |
US11428259B2 (en) | 2020-03-30 | 2022-08-30 | Plainsman Mfg. Inc. | Shear coupling and method of assembling same |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4411546A (en) * | 1982-09-20 | 1983-10-25 | Technicraft, Inc. | Oil well sucker rod shear tool |
US20040202521A1 (en) * | 2003-04-11 | 2004-10-14 | Karel Bostik | Shear coupling |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2891330B1 (en) * | 2005-09-27 | 2007-12-21 | Gkn Driveline Sa Sa | SECURITY MODULE FOR TRANSMISSION AND ASSEMBLY THEREFOR |
-
2006
- 2006-09-19 US US11/533,307 patent/US20080066901A1/en not_active Abandoned
-
2007
- 2007-09-11 CA CA002601152A patent/CA2601152A1/en not_active Abandoned
- 2007-09-14 GB GB0717917A patent/GB2442111A/en not_active Withdrawn
- 2007-09-19 NO NO20074791A patent/NO20074791L/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4411546A (en) * | 1982-09-20 | 1983-10-25 | Technicraft, Inc. | Oil well sucker rod shear tool |
US20040202521A1 (en) * | 2003-04-11 | 2004-10-14 | Karel Bostik | Shear coupling |
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GB2472861B (en) * | 2009-08-24 | 2011-07-06 | Dynamic Dinosaurs Bv | Flexible couplings for tubular members |
US8708039B2 (en) | 2009-09-30 | 2014-04-29 | Conocophillips Company | Producing gas and liquid from below a permanent packer in a hydrocarbon well |
US20110073318A1 (en) * | 2009-09-30 | 2011-03-31 | Conocophillips Company | Producing gas and liquid from below a permanent packer in a hydrocarbon well |
WO2011041548A1 (en) * | 2009-09-30 | 2011-04-07 | Conocophillps Company | Producing gas and liquid from below a permanent packer in a hydrocarbon well |
US20110150596A1 (en) * | 2009-12-17 | 2011-06-23 | Weatherford/Lamb, Inc. | Shear coupling assembly for use with rotary and reciprocating pumps |
US8636057B2 (en) | 2009-12-17 | 2014-01-28 | Weatherford/Lamb, Inc. | Shear coupling assembly for use with rotary and reciprocating pumps |
US9605493B2 (en) | 2014-06-23 | 2017-03-28 | Arthur W. Lauder | Downhole coupling |
US11428259B2 (en) | 2020-03-30 | 2022-08-30 | Plainsman Mfg. Inc. | Shear coupling and method of assembling same |
US11965537B2 (en) | 2020-03-30 | 2024-04-23 | Plainsman Mfg. Inc. | Shear coupling and method of assembling same |
US20210310511A1 (en) * | 2020-04-01 | 2021-10-07 | Hubbell Incorporated | Breakaway threaded fasteners and electrical connectors having such fasteners |
US11953043B2 (en) * | 2020-04-01 | 2024-04-09 | Hubbell Incorporated | Breakaway threaded fasteners and electrical connectors having such fasteners |
CN113445991A (en) * | 2021-06-24 | 2021-09-28 | 中油智采(天津)科技有限公司 | Artificial intelligence single-machine multi-well oil pumping machine monitoring method, system and storage medium |
Also Published As
Publication number | Publication date |
---|---|
GB2442111A (en) | 2008-03-26 |
NO20074791L (en) | 2008-03-21 |
CA2601152A1 (en) | 2008-03-19 |
GB0717917D0 (en) | 2007-10-24 |
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Owner name: WEATHERFORD/LAMB, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GERELUK, RICK;REEL/FRAME:018275/0105 Effective date: 20060918 |
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