Load uncoupling device of oil pumping polish rod

Abstract

The invention relates to the field of oil extraction in oil fields, in particular to an oil pumping polish rod load disconnecting device, and aims to solve the technical problems that related load transmission modes are complex in operation and have potential safety hazards. The load disconnecting device for the oil pumping polish rod comprises a bearing screw tap, wherein the bearing screw tap is used for being fixed to the free end of the polish rod; the lower hoop cushion is used for being arranged on the polish rod in a sleeving mode and further used for being arranged on a beam hanger in a sitting mode; the first supporting joint is used for being connected between the lower hoop pad and the bearing screw tap so as to be arranged on the polish rod in a sleeving mode and detachably matched with the polish rod. When the load disconnecting device for the oil pumping polish rod is used for adjusting the anti-impact distance and the pump collision, a user does not need to climb a Christmas tree to disassemble and hit a square clip again, and only needs to replace the first supporting section with the proper length, so that the operation is convenient and rapid, and the safety is ensured.

Description

Technical Field

[0001] This invention relates to the field of oilfield production, and in particular to a pumping rod load disconnection device. Background Technology

[0002] In a rod-pump oil production system, the downhole pump plunger moves by the reciprocating motion of the pumping unit's head on the surface. The load is transferred between the pumping unit's suspension cable and the polished rod via a clamp. When formation production is stable, this load transfer method is unaffected. However, when formation production is unstable, contains gas, produces sand, or the oil is viscous, the downhole pump may malfunction. In such cases, adjustments to the anti-impact distance and pump-stopping mechanisms are necessary.

[0003] The following problems exist when adjusting the anti-impact distance and pump collision: (1) It increases the workload of on-site personnel. When reaching the polished rod (loading and unloading), it is necessary to climb the production tree to disassemble and reinstall the square clamp. Due to the operator and the teeth of the square clamp, the clamp may be pulled out during loading, causing the downhole plunger to stop and hit the fixed valve; (2) It increases unsafe factors. First, when the operator climbs the production tree to disassemble and reinstall the square clamp, it is easy for personnel to slip and fall. Second, the square clamp may hit people after being pulled out from the polished rod.

[0004] Based on the above, the method of transferring loads through square clamps is no longer suitable for current oil well production management. Therefore, it is particularly important to design a load disconnection device that is easy to operate and highly safe. Summary of the Invention

[0005] The purpose of this invention is to provide a load disconnection device for sucker rods to alleviate the technical problems of complex operation and safety hazards associated with related load transfer methods.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] The oil sucker rod load disconnection device provided by the present invention includes: a bearing tap, which is used to fix to the free end of the oil sucker rod;

[0008] The lower hoop pad is used to be fitted onto the smooth rod and also to be seated on the suspension device;

[0009] The first support section has at least one component for connecting the lower hoop pad and the bearing tap to be fitted onto the guide rod and is detachably engaged with the guide rod.

[0010] Furthermore, a through groove is provided on the side wall of the first support section, the through groove extending from one end of the first support section to the other end, and its width is equal to the diameter of the light rod.

[0011] Furthermore, the oil sucker rod load disconnection device also includes an upper hoop pad, which is used to be sleeved on the oil sucker rod and located between the bearing tap and the first support section, and is used to cooperate with the lower hoop pad to clamp the first support section.

[0012] Furthermore, the sucker rod load disconnection device also includes a middle hoop pad, which is used to be sleeved on the sucker rod and located between the upper hoop pad and the lower hoop pad, so as to cooperate with the upper hoop pad and the lower hoop pad respectively to clamp the corresponding first support section.

[0013] Furthermore, the middle hoop pad is provided with at least one.

[0014] Furthermore, a first boss is formed on the inner wall of the upper hoop pad, and the first boss extends around the axis of the upper hoop pad;

[0015] One end of the first support section is located inside the upper hoop and abuts against the first boss.

[0016] Furthermore, a second protrusion is formed on the inner wall of the central hoop pad, and the second protrusion extends around the axis of the central hoop pad;

[0017] One end of the first support section is located inside the central hoop and abuts against the second boss.

[0018] Furthermore, a third protrusion is formed on the inner wall of the lower hoop pad, and the third protrusion extends around the axis of the lower hoop pad;

[0019] One end of the first support section is located inside the lower hoop and abuts against the third boss.

[0020] Furthermore, the bearing tap is mounted on the guide rod and is threadedly connected to the guide rod.

[0021] Furthermore, the end of the bearing tap furthest from the lower hoop is tapered.

[0022] In summary, the technical effects achieved by the sucker rod load disconnection device provided by this invention are as follows:

[0023] The sucker rod load disconnection device is fixedly connected to the sucker rod via a bearing tap and is mounted on the suspension cable via a lower hoop pad. This transfers the load of the entire sucker rod to the suspension cable. When adjusting the anti-blowout distance or pump collision, the initial steps are the same as using a square clamp to transfer the load. First, stop the walking beam pumping unit at a point slightly above the bottom dead center. Then, fully engage the pumping unit brake. The operator stands on the ground and attaches a square clamp to the blowout preventer box at the wellhead. Then, release the pumping unit brake, transferring the entire sucker rod load to the wellhead square clamp through this clamp. Next, remove the original first support section and replace it with a new first support section of appropriate length according to the specific pump setup. Then, slowly start the pumping unit, transferring the entire sucker rod load to the suspension cable again. Finally, remove the wellhead square clamp from the wellhead blowout preventer box at the wellhead, adjust the anti-blowout distance, and perform the pump collision adjustment. After completion, reset the original first support section, and the walking beam pumping unit resumes normal operation, with the well producing normally.

[0024] It can be seen that, compared with the existing technology, this sucker rod load disconnection device does not require climbing the production tree to disassemble and re-install the square clamps when adjusting the anti-impact distance or pump collision. It only requires replacing the first support section of appropriate length, which is convenient and quick to operate and ensures safety. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of the oil sucker rod load disconnection device provided in an embodiment of the present invention.

[0027] Icons: 1-Bearing tap; 2-Smooth rod;

[0028] 3-Lower hoop pad; 31-Third boss;

[0029] 4-First support section;

[0030] 5-Upper hoop pad; 51-First boss;

[0031] 6-Middle hoop pad; 61-Second boss. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] The method of transferring load by using square clamps has the following problems when adjusting the anti-impact distance and pump collision: (1) It increases the workload of on-site personnel. When reaching the polished rod (loading or unloading), it is necessary to climb the production tree to disassemble and reinstall the square clamps. Due to the operator and the teeth of the square clamps, the clamps may be pulled out during loading, causing the downhole plunger to stop and hit the fixed valve; (2) It increases the unsafe factors. First, when the operator climbs the production tree to disassemble and reinstall the square clamps, it is easy for personnel to slip and fall. Second, the square clamps may hit people after being pulled out from the polished rod.

[0036] In view of this, the present invention provides a load disconnection device for a sucker rod, comprising a bearing tap 1 for fixing to the free end of a sucker rod 2; a lower hoop 3 for fitting onto the sucker rod 2 and for sitting on a suspension device; and a first support section 4, having at least one support section for connecting the lower hoop 3 and the bearing tap 1 to fit onto the sucker rod 2 and for detachably engaging with the sucker rod 2.

[0037] The sucker rod load disconnection device is fixedly connected to the sucker rod 2 via a bearing tap 1, and is mounted on the suspension device as a whole via a lower hoop pad 3. In this way, the load of the entire sucker rod is transferred to the suspension device. When adjusting the anti-blowout distance or pump contact is required, the initial steps are similar to those using square clamps to transfer the load. First, stop the walking beam pumping unit at a point slightly above the bottom dead center. Then, fully engage the pumping unit brake. The operator stands on the ground and attaches a square clamp to the blowout preventer box at the wellhead of the Christmas tree. Then, release the pumping unit brake and transfer the entire sucker rod load to the Christmas tree through this square clamp. Next, remove the original first support section 4 and replace it with a new first support section 4 of appropriate length according to the specific pump setup. Then, slowly start the pumping unit and transfer the entire sucker rod load to the suspension cable again. Then, remove the square clamp from the wellhead of the Christmas tree blowout preventer box, adjust the anti-blowout distance, and pump contact. After completion, reset the original first support section 4, and the walking beam pumping unit will operate normally, and the well will begin normal production.

[0038] As can be seen, compared with the existing technology, this oil sucker rod load disconnection device does not require climbing the production tree to disassemble and re-install the square clamps when adjusting the anti-impact distance or pump collision. It only requires replacing the first support section 4 of appropriate length, which is convenient and quick to operate and ensures safety.

[0039] The following combination Figure 1 The structure and shape of the sucker rod load disconnection device provided in this embodiment will be described in detail:

[0040] In this embodiment, reference Figure 1 The sucker rod load disconnection device also includes an upper hoop washer 5 and a middle hoop washer 6; the upper end of the upper hoop washer 5 is flat and is used to abut against the bottom end of the bearing tap 1; the middle hoop washer 6 is provided with at least one, optionally, such as Figure 1 As shown, there is one middle hoop pad 6, which is sleeved on the smooth rod 2 and located between the upper hoop pad 5 and the lower hoop pad 3. Correspondingly, there are two first support sections 4. The two first support sections 4 are respectively clamped between the upper hoop pad 5 and the middle hoop pad 6 and between the middle hoop pad 6 and the lower hoop pad 3. The one located above is used as an adjustment support section, and the one located below is used as a fixed support section.

[0041] In application, after the wellhead Christmas tree is installed during well completion, the downhole plunger anti-blowout distance is adjusted, and a square clamp is installed on the blowout preventer box at the Christmas tree wellhead. It is required that the length of the polished rod 2 protruding from the upper part of the Christmas tree be greater than 1200mm. Next, the walking beam pumping unit is stopped at the bottom dead center, and the polished rod 2 passes through the center hole of the suspension cable on the walking beam. Then, the lower hoop pad 3, middle hoop pad 6, and upper hoop pad 5 are sequentially fitted onto the polished rod 2 from the upper end. The bearing tap 1 is then fixedly connected to the upper end of the polished rod 2. Finally, the fixing... The fixed support section is fitted onto the polished rod 2 between the middle hoop pad 6 and the lower hoop pad 3. Then, the length of the adjustable support section is selected according to the upper margin of the polished rod 2, and the selected adjustable support section is fitted onto the polished rod 2 between the upper hoop pad 5 and the middle hoop pad 6. Finally, the pumping unit is slowly started, so that the donkey head drags the suspension rope device to slowly contact the bottom surface of the lower hoop pad 3. After the load of the entire stroke of sucker rod + pump fluid column in the well is transferred to the suspension rope device, the square clamp on the blowout preventer box at the wellhead of the wellhead is removed, and the donkey head drags the entire stroke of sucker rod to work normally.

[0042] Further reference Figure 1 The bearing tap 1 is threadedly connected to the polished rod 2. Preferably, the upper part of the bearing tap 1 is a conical plug, and the lower part has an internal thread that mates with the polished rod 2. Designing the top of the bearing tap 1 as conical prevents water from entering the bearing tap 1 and avoids affecting the strength of the connection between the bearing tap 1 and the polished rod 2 due to thread corrosion.

[0043] Regarding the first support section 4, specifically:

[0044] refer to Figure 1 The first support section 4 has a through groove on its side wall, which extends from one end of the first support section 4 to the other end, and its width is equal to the diameter of the smooth rod 2. With this design, the first support section 4 can be directly fitted onto the smooth rod 2 radially, which is convenient for replacement when it is necessary to adjust the anti-collision distance or pump collision.

[0045] The first support section 4 at the top, i.e. the adjustable support section, is designed in series for easy on-site adjustment. Optional lengths include 100mm, 150mm, 200mm, 250mm, and 300mm. The first support section 4 at the bottom, i.e. the fixed support section, is optionally designed with a fixed length of 1000mm for long-term fixed use.

[0046] Regarding the tightening of the hoop on the first support section 4, specifically:

[0047] refer to Figure 1 A first boss 51 protrudes from the inner wall of the upper hoop 5, extending around the axis of the upper hoop 5. The end face of the necked step at the top of the adjusting support section abuts against the bottom surface of the first boss 51, and the step surface abuts against the bottom end face of the upper hoop 5. With this design, the upper hoop 5 serves as a support for the bearing tap 1, a positioning function for the polished rod 2, and a clamping function for the adjusting support section.

[0048] Continue to refer to Figure 1 A second protrusion 61 protrudes from the inner wall of the central hoop pad 6, extending around the axis of the central hoop pad 6. The end face of the lower necked step of the adjusting support section abuts against the top surface of the second protrusion 61, and the step surface abuts against the top surface of the central hoop pad 6. The end face of the upper necked step of the fixed support section abuts against the bottom surface of the second protrusion 61, and the step surface abuts against the bottom end face of the central hoop pad 6. With this design, the central hoop pad 6 acts as a clamping device for both the adjusting and fixed support sections.

[0049] Please continue to refer to this. Figure 1 A third protrusion 31 is formed on the inner wall of the lower hoop 3, extending around the axis of the lower hoop 3; the end face of the necked step at the bottom of the fixed support section abuts against the top surface of the third protrusion 31, and the step surface abuts against the top surface of the lower hoop 3. Here, the lower hoop 3 acts as a clamp for the fixed support section, while ensuring that the entire device supporting the load of the sucker rod and the liquid column on the pump sits stably on the suspension cable.

[0050] The working process of the sucker rod load disconnection device provided in this embodiment is as follows:

[0051] When adjusting the anti-surge distance and activating the pump at the bottom of the well, first stop the walking beam pumping unit's head slightly above the bottom dead center and fully engage the pumping unit brake. Then, the operator, standing on the ground, installs a square clamp on the Christmas tree wellhead to transfer the entire sucker rod load to the Christmas tree via this clamp. Next, release the pumping unit brake, stop the walking beam pumping unit's head at the bottom dead center, and fully engage the pumping unit brake again. At this point, the operator, still on the ground at the Christmas tree wellhead, replaces the adjusting support section and the fixed support section. After this, the pumping unit is slowly started. Once the entire sucker rod load is again transferred to the suspension cable, the square clamp on the Christmas tree wellhead is removed, and the anti-surge distance and pump activation operation are performed. The entire operation does not require climbing to install the square clamp, making it convenient, quick, and ensuring safety.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A load disconnection device for a sucker rod, characterized in that, include: A support tap (1) is used to fix the free end of the guide rod (2); The lower hoop pad (3) is used to be fitted onto the smooth rod (2) and also to be seated on the suspension device; The first support section (4) is provided with at least one, which is used to connect between the lower hoop pad (3) and the bearing tap (1) to be sleeved on the light rod (2) and is detachably engaged with the light rod (2).

2. The oil sucker rod load disconnection device according to claim 1, characterized in that, The first support section (4) has a through groove on its side wall. The through groove extends from one end of the first support section (4) to the other end, and its width is equal to the diameter of the light rod (2).

3. The oil sucker rod load disconnection device according to claim 2, characterized in that, The oil sucker rod load disconnection device also includes an upper hoop pad (5), which is used to be sleeved on the oil sucker rod (2) and located between the bearing tap (1) and the first support section (4), and is used to cooperate with the lower hoop pad (3) to clamp the first support section (4).

4. The oil sucker rod load disconnection device according to claim 3, characterized in that, The oil sucker rod load disconnection device also includes a middle hoop pad (6), which is used to be sleeved on the oil sucker rod (2) and is located between the upper hoop pad (5) and the lower hoop pad (3) to cooperate with the upper hoop pad (5) and the lower hoop pad (3) respectively to clamp the corresponding first support section (4).

5. The oil sucker rod load disconnection device according to claim 4, characterized in that, The central hoop pad (6) is provided with at least one.

6. The oil sucker rod load disconnection device according to claim 4, characterized in that, A first boss (51) is formed on the inner wall of the upper hoop (5), and the first boss (51) extends around the axis of the upper hoop (5). One end of the first support section (4) is located inside the upper hoop (5) and abuts against the first boss (51).

7. The oil sucker rod load disconnection device according to claim 4, characterized in that, A second protrusion (61) is formed on the inner wall of the middle hoop pad (6), and the second protrusion (61) extends around the axis of the middle hoop pad (6); One end of the first support section (4) is located inside the middle hoop (6) and abuts against the second boss (61).

8. The oil sucker rod load disconnection device according to claim 4, characterized in that, A third protrusion (31) is formed on the inner wall of the lower hoop pad (3), and the third protrusion (31) extends around the axis of the lower hoop pad (3); One end of the first support section (4) is located inside the lower hoop (3) and abuts against the third boss (31).

9. The oil sucker rod load disconnection device according to claim 1, characterized in that, The bearing tap (1) is placed on the guide rod (2) and is threadedly connected to the guide rod (2).

10. The oil sucker rod load disconnection device according to claim 9, characterized in that, The end of the bearing tap (1) away from the lower hoop pad (3) is tapered.

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