A device for preventing rotation of a polished rod of a pumping well

Abstract

The utility model discloses a pumping unit well polished rod anti -rotation device, it is mainly by the polished rod anti -rotation mechanism that connects between polished rod and pumping rod is composed, and the polished rod anti -rotation mechanism includes the connection nipple, anti -rotation sleeve and suspension joint, and the both ends of connection nipple are connected with polished rod and anti -rotation sleeve respectively, and the suspension joint below connection nipple that hangs in anti -rotation sleeve is connected with pumping rod, and anti -rotation sleeve and suspension joint can rotate each other. The utility model in -process has set up the anti -rotation mechanism of preventing polished rod rotation, and has installed radial bearing and knuckle bearing as auxiliary device in the rope hanger, in addition, the fixed mode between polished rod and square clamp has also made improvement, makes square clamp fixed together with polished rod through slip, makes the fixed between square clamp and polished rod more reliable, can also offset a part of polished rod's torsional force simultaneously. Eliminate polished rod rotation, hair plait twist, the whole pumping rod column break off well caused by, cause the major economic loss of lying well.

Description

Technical Field

[0001] This utility model relates to the field of oilfield mechanical oil production, and in particular to a device for preventing the polished rod of a pumping well from rotating. Background Technology

[0002] The primary method for lifting crude oil production in my country's major oilfields is through pumping units equipped with rod pumps. However, factors such as non-centering of the pumping unit head, large well deviation (dogleg angle), viscous oil, high gas content, and the significant vibration load of large pumps with an outer diameter of 70mm or more can cause the polished rod to rotate during actual production. This can lead to twisting of the sucker rod, which, if prolonged, can cause it to break off, or even result in the entire sucker rod string falling into the well. Statistics show that approximately 0.5% of oil wells experience production anomalies annually due to polished rod rotation, with each well losing an average of about 10 tons of production. Restoring these wells to normal production is not only time-consuming and labor-intensive but also poses potential safety hazards and environmental pollution.

[0003] Currently, there are several existing methods to prevent polished rod rotation in oil wells, but none of them can fundamentally solve the problem. Patent application CN201420653151.2 discloses an anti-reverse torque polished rod connector, which consists of a pumping unit suspension rope device, a pressure plate, a sealing cap, an upper pressure ring, a ball bearing, a lower support ring, a flexible connecting rope end chamber, and pressure plate connecting bolts. The pumping unit suspension rope device has a polished rod passage hole in the middle, through which the polished rod passes. The connector is formed by the pressure plate and the pressure plate connecting bolts. Bolts are used to fix the polished rod to the pumping unit suspension rope assembly. Screw holes are provided on the upper sides of both sides of the suspension rope assembly. From bottom to top, a lower support ring, a ball bearing, an upper pressure ring, and a sealing cap are sequentially installed in these screw holes. During operation, the metal end cap of the flexible wire rope is embedded in the end cap cavity of the flexible connecting rope. When the flexible wire rope generates a reverse torque, the ball bearing rotates, releasing the reverse torque. The suspension rope assembly remains perpendicular to the polished rod, thus more effectively preventing the sucker rod from becoming detached from the pumping unit well.

[0004] However, the inventions mentioned above can mainly reduce the reverse torque caused by the pumping unit's head not being centered, but cannot reduce the reverse torque caused by factors such as large well deviation dogleg, thick oil, large gas volume, and large vibration load of large pumps with an outer diameter of 70mm or more, as well as the longitudinal sway caused by excessive vibration load.

[0005] Patent application CN201620035114.4 discloses a double-plate composite anti-slip rod suspension device, belonging to the field of oilfield mechanical oil production. This suspension device includes at least: a polished rod, a braid, an upper suspension plate, a support block, a lower suspension plate, a braid head, a main support square clamp, and an anti-slip square clamp. The support blocks are symmetrically arranged on both sides of the upper surface of the lower suspension plate, and the upper suspension plate is mounted on the top surface of the two support blocks. The anti-slip square clamp is located in the middle of the bottom surface of the upper suspension plate. By setting the support block and the anti-slip square clamp between the lower and upper suspension plates, after the polished rod breaks, the anti-slip square clamp falls directly onto the upper surface of the lower suspension plate, allowing the pumping unit to continue operating normally. This effectively avoids the problems of crude oil leakage and environmental pollution caused by damage to the packing box, and the risk of motor burnout due to severe imbalance of the pumping unit. It plays a safety protection role in ensuring normal oil well production and preventing secondary disasters.

[0006] The above invention solves the problem that after the polished rod above the anti-detachment square clamp breaks off, the anti-detachment square clamp falls directly onto the upper surface of the lower plate of the suspension device, allowing the pumping unit to continue to work normally. However, it does not solve the problems of the braid twisting and the sucker rod disengaging caused by the rotation of the polished rod.

[0007] Patent application number CN202210274612.4 discloses a multi-functional protection device for oil well sucker rods, relating to the technical field of oilfield production equipment. A load sensing mechanism is provided between the upper part of the braided weight and the rope-threading block. A compression spring is provided between the outer side of the clamping block and the guide hole. A stepped notch is opened below the clamping block facing the sucker rod. The outer side of the clamp is locked into the stepped notch of the clamping block, and the clamp is securely connected to the sucker rod.

[0008] The invention has the following advantages: by placing the load sensing mechanism at the connection between the braid and the bearing block, the impact of sucker rod vibration on the load sensing mechanism is reduced, thereby improving service life and data accuracy. The damping effect within the load sensing mechanism reduces the pressure vibration amplitude sensed by the pressure sensor. During the metal fatigue and elongation of the sucker rod, the clamping block is securely connected to the sucker rod under the action of the compression spring, preventing it from falling into the well. The remote transmitter transmits this information to the control center in a timely manner so that the sucker rod can be replaced promptly, thus preventing production accidents from occurring in advance.

[0009] However, while the invention solved the problem of the clamping block securing the polished rod under the action of the compression spring during the fatigue and elongation of the polished rod, preventing it from falling into the well, it did not solve the problems of the braids twisting and the sucker rod disengaging caused by the rotation of the polished rod.

[0010] The problem of the slippage between the polished rod and the sucker rod below the suspension device caused by the twisting of the braid due to the rotation of the polished rod at the current oilfield production site is an urgent issue that needs to be addressed at the production site. Summary of the Invention

[0011] The purpose of this invention is to provide an anti-rotation device for the polished rod in oil wells, solving the problems of twisting of the polished rod's braids and disengagement of the polished rod below the suspension rope from the sucker rod caused by polished rod rotation. This ensures safe production in oil wells, prevents accidents caused by polished rod rotation, and improves the production efficiency and economic benefits of oil wells while protecting the environment.

[0012] The technical solution of this utility model is: a polished rod anti-rotation device for oil wells, wherein: it mainly consists of a polished rod anti-rotation mechanism connected between the polished rod and the sucker rod; the polished rod anti-rotation mechanism includes a connecting section, an anti-rotation sleeve, and a suspension joint, wherein: the two ends of the connecting section are respectively connected to the polished rod and the anti-rotation sleeve; the suspension joint below the connecting section, which is suspended inside the anti-rotation sleeve, is connected to the sucker rod; the anti-rotation sleeve and the suspension joint can rotate relative to each other.

[0013] Preferably, the upper inner cavity of the connecting short section is provided with an internal thread and can be connected to the external thread of the lower part of the polished rod; the lower outer circle of the connecting short section is provided with an external thread and can be connected to the anti-rotation sleeve thread; the upper outer circle of the connecting short section exposed from the anti-rotation sleeve is provided with a wrench square.

[0014] Preferably, the suspension joint is a T-shaped rod with a suspension head at the top, and the lower rod of the suspension joint has an external thread that can be threaded to the sucker rod coupling of the sucker rod.

[0015] Preferably, the upper part of the inner cavity of the anti-rotation sleeve is provided with an internal thread that is threadedly connected to the anti-rotation sleeve; the lower end of the inner cavity of the anti-rotation sleeve is provided with a suspension step.

[0016] Preferably, the diameter of the central hole formed by the suspension step at the lower end of the anti-rotation sleeve inner cavity is larger than the outer diameter of the lower rod of the suspension joint and smaller than the outer diameter of the upper suspension head of the suspension joint.

[0017] Preferably, the outer diameter of the suspension head at the upper part of the suspension joint is smaller than the inner diameter of the anti-rotation sleeve.

[0018] Preferably, the square clip fixed to the upper part of the optical rod sits on the upper end face of the suspension device, and the square clip is fixed to the optical rod by a clip.

[0019] Preferably, the latch seated in the square latch consists of two conical semicircles with inner latch teeth, and the outer circle of the upper part of the two conical semicircles is larger than the outer circle of the lower part of the conical semicircle. When the two conical semicircles of the latch are engaged, the inner latch teeth machined in the center hole of the latch are tightly engaged with the guide rod, and the center hole formed by the two conical semicircles is smaller than the outer circle of the guide rod.

[0020] Preferably, the upper part of the guide rod through hole in the suspension device is provided with a bearing mounting cavity that communicates with the upper end face of the suspension device and is concentric with the guide rod through hole.

[0021] Preferably, in the suspension device, a radial bearing and a spherical bearing are installed between the bearing mounting cavity above the through hole and the optical rod, from top to bottom.

[0022] Compared with the prior art, the significant advantages of this utility model are as follows: This utility model is equipped with an anti-rotation mechanism to prevent the smooth rod from rotating, and radial bearings and joint bearings are installed in the suspension device as auxiliary devices; in addition, the fixing method between the smooth rod and the square clip has also been improved, so that the square clip is fixed to the smooth rod by the clip, making the fixing between the square clip and the smooth rod more reliable, and at the same time, it can also offset part of the torsional force of the smooth rod.

[0023] This invention features a simple structure and reliable operation, preventing the problem of twisting of the sucker rod's braids due to rod rotation. Furthermore, because the anti-rotation sleeve and the suspension joint can rotate relative to each other, it solves the problem of disengagement between the sucker rod and the polished rod, and the serious consequences of such disengagement. It eliminates the significant economic losses caused by the entire sucker rod string breaking off and falling into the well due to rod rotation and braid twisting, thus preventing well collapse.

[0024] This invention is applicable to oil wells where factors such as non-centered pumping unit head, large dogleg deviation, viscous oil, and high gas content can cause the polished rod to rotate and the burrs to twist during actual production. It can be widely applied to the above-mentioned oil wells, improving the production efficiency of the pumping unit, reducing the daily management workload of employees, protecting the environment, and has significant effects and obvious economic benefits. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] In the diagram: 1. Braided rod; 2. Smooth rod; 3. Square clip; 31. Slipper; 4. Radial bearing; 5. Joint bearing; 6. Suspension rope device; 7. Rope cap; 8. Anti-rotation mechanism for smooth rod; 81. Connecting short section; 82. Anti-rotation sleeve; 83. Suspension joint; 9. Sucker rod. Detailed Implementation

[0027] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this utility model. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] See Figure 1 An anti-rotation device for the polished rod of a pumping well mainly consists of an anti-rotation mechanism 8 connecting the polished rod 2 and the sucker rod 9. The anti-rotation mechanism 8 includes a connecting section 81, an anti-rotation sleeve 82, and a suspension joint 83. The two ends of the connecting section 81 are respectively connected to the polished rod 2 and the anti-rotation sleeve 82. The suspension joint 83, which is suspended below the connecting section 81 inside the anti-rotation sleeve 82, is connected to the sucker rod 9. The anti-rotation sleeve 82 and the suspension joint 83 can rotate relative to each other.

[0031] To prevent damage to the pumping well caused by the rotation of the polished rod 2 due to factors such as the pumping unit's head not being centered, large well deviation dogleg, thick oil, large gas volume, and large vibration load of large pumps with an outer diameter of 70mm or more, this utility model connects the polished rod anti-rotation mechanism 8 between the polished rod 2 and the sucker rod 9.

[0032] The bottom end of the braid 1 is connected to a rope cap 7, and the braid 1 is embedded on both sides of the suspension device 6. When the braid 1 moves upward, the rope cap 7 drives the suspension device 6 to move upward. When the braid 1 moves downward, the suspension joint 83 in the anti-rotation mechanism 8 can rotate within the anti-rotation sleeve 82, which can counteract the rotation of the bare rod 2 and solve the problem caused by the rotation of the bare rod 2.

[0033] This utility model has a simple structure and reliable operation, and can prevent the problem of the braid 1 twisting due to the rotation of the polished rod 2. At the same time, since the anti-rotation sleeve 82 and the suspension joint 83 can rotate relative to each other, it solves the problem of the sucker rod 9 and the polished rod 2 disengaging and the serious consequences caused by the sucker rod 9 disengaging.

[0034] This utility model has significant practical effects and can bring obvious economic benefits.

[0035] Based on the above embodiment 1, the present invention also has the following embodiments: a preferred embodiment: the upper inner cavity of the connecting short section 81 is provided with an internal thread and can be connected with the external thread of the lower part of the light rod 2; the lower outer circle of the connecting short section 81 is provided with an external thread and can be threadedly connected with the anti-rotation sleeve 82; the upper outer circle of the connecting short section 81 exposed to the anti-rotation sleeve 82 is provided with a wrench square, which facilitates connection and disassembly on site.

[0036] In a preferred embodiment, the suspension joint 83 is a T-shaped rod with a suspension head at the top, and the lower part of the suspension joint 83 has an external thread that can be threaded to the sucker rod coupling of the sucker rod 9.

[0037] The upper part of the inner cavity of the anti-rotation sleeve 82 is provided with an internal thread that is threadedly connected to the anti-rotation sleeve 82; the lower end of the inner cavity of the anti-rotation sleeve 82 is provided with a suspension step.

[0038] The diameter of the central hole formed by the suspension step at the lower end of the inner cavity of the anti-rotation sleeve 82 is larger than the outer diameter of the lower rod of the suspension joint 83 and smaller than the outer diameter of the upper suspension head of the suspension joint 83.

[0039] In a preferred embodiment, the outer diameter of the suspension head at the upper part of the suspension joint 83 is smaller than the inner diameter of the anti-rotation sleeve 82. This suspension head can sit on the suspension step of the anti-rotation sleeve 82 and can rotate on the suspension step of the anti-rotation sleeve 82. The suspension joint 83 is suspended on the suspension step at the lower end of the inner cavity of the anti-rotation sleeve 82, and its lower rod is threadedly connected to the sucker rod coupling of the sucker rod 9. This prevents the sucker rod 9 connected below the suspension joint 83 from twisting, and also prevents the polished rod 2 on the connecting section 81 from rotating.

[0040] In a preferred embodiment, a square clip 3 fixed to the upper part of the light rod 2 sits on the upper end face of the suspension device 6, and the square clip 3 is fixed to the light rod 2 by a clip 31.

[0041] In a preferred embodiment, the slip 31 seated in the square clamp 3 consists of two conical semicircles with internal slip teeth, the upper outer circle of each semicircle being larger than the lower outer circle. When the two conical semicircles of the slip 31 are engaged, the internal slip teeth machined into the central hole of the slip 31 tightly mesh with the polished rod 2. The central hole formed by the two conical semicircles is smaller than the outer circle of the polished rod 2. This allows the slip 31 to maintain continuous pressure on the polished rod 2, thus firmly securing the polished rod 2 during the operation of the pumping unit and preventing it from shifting or falling off.

[0042] In a preferred embodiment, a bearing mounting cavity is provided above the through hole of the guide rod in the suspension device 6, which is connected to the upper end face of the suspension device 6 and concentric with the through hole of the guide rod.

[0043] In a preferred embodiment, a radial bearing 4 and a spherical bearing 5 are installed between the bearing mounting cavity above the through hole of the smooth rod and the smooth rod 2, from top to bottom, in the suspension device 6. The radial bearing 4 is a sliding bearing capable of withstanding radial loads, while the spherical bearing 5, capable of bearing multi-faceted loads, is installed to counteract the torsion problem of the suspension device 6 caused by oil thickening, gas injection causing wellhead upward movement, and ground foundation subsidence.

[0044] A radial bearing 4 and a spherical bearing 5 are installed between the square clip 3 on the rod 2 and the suspension device 6. When rotational torque is generated, the sliding friction between the square clip 3 and the suspension device 6 is converted into rolling friction. At the same time, the spherical bearing 5 can reduce the longitudinal swing amplitude of the braid 1, thereby reducing the damage to the braid 1.

[0045] When the donkey head of the oil pump is not centered, causing the braid 1 to twist, the suspension device 6 and the square clamp 3 will slide relative to each other. Due to the action of the radial bearing 4, the sliding friction between the square clamp 3 and the radial bearing 4 is converted into rolling friction, which basically eliminates the torsional force. Since the square clamp 3 is clamped to the polished rod 2 by the slip 31, the force of rotation of the polished rod 2 is also eliminated.

[0046] When the hair braid 1 swings longitudinally, the longitudinal swing amplitude is eliminated due to the action of the joint bearing 5, thereby reducing the damage to the hair braid 1.

[0047] This invention completely solves the problems of polished rod 2 rotation, braid 1 twisting, and polished rod 2 disengaging from sucker rod 9. Its effectiveness is significant, avoiding all the drawbacks and potential problems caused by these issues. It ensures the normal production of the pumping well, avoids the need for restoration work due to braid 1 twisting and polished rod 2 disengaging from sucker rod 9, reduces production costs, labor intensity, and daily maintenance workload, and protects the environment while ensuring safe production.

[0048] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. A device for preventing the polished rod of a pumping unit well from rotating, characterized in that, It mainly consists of a polished rod anti-rotation mechanism connected between the polished rod and the sucker rod; the polished rod anti-rotation mechanism includes a connecting section, an anti-rotation sleeve, and a suspension joint, wherein: the two ends of the connecting section are connected to the polished rod and the anti-rotation sleeve respectively; the suspension joint below the connecting section, which is suspended inside the anti-rotation sleeve, is connected to the sucker rod; the anti-rotation sleeve and the suspension joint can rotate relative to each other.

2. The anti-rotation device for the polished rod of a pumping unit well as described in claim 1, characterized in that, The upper inner cavity of the connecting section is provided with an internal thread and can be connected to the external thread of the lower part of the polished rod; the lower outer circle of the connecting section is provided with an external thread and can be connected to the anti-rotation sleeve thread; the upper outer circle of the connecting section exposed from the anti-rotation sleeve is provided with a wrench square.

3. The anti-rotation device for the polished rod of a pumping unit well as described in claim 1, characterized in that, The suspension joint is a T-shaped rod with a suspension head at the top, and the lower part of the suspension joint has an external thread that can be threaded to the sucker rod coupling of the sucker rod.

4. The anti-rotation device for the polished rod of a pumping unit well as described in claim 3, characterized in that, The upper part of the inner cavity of the anti-rotation sleeve is provided with an internal thread that is threadedly connected to the anti-rotation sleeve; the lower end of the inner cavity of the anti-rotation sleeve is provided with a suspension step.

5. The anti-rotation device for the polished rod of a pumping unit well as described in claim 4, characterized in that, The diameter of the central hole formed by the suspension step at the lower end of the anti-rotation sleeve inner cavity is larger than the outer diameter of the lower rod of the suspension joint and smaller than the outer diameter of the upper suspension head of the suspension joint.

6. The anti-rotation device for the polished rod of a pumping unit well as described in claim 4, characterized in that, The outer diameter of the suspension head at the top of the suspension joint is smaller than the inner diameter of the anti-rotation sleeve.

7. The anti-rotation device for the polished rod of a pumping unit well as described in claim 4, characterized in that, A square clip fixed to the upper part of the optical rod sits on the upper end face of the suspension device, and the square clip is fixed to the optical rod by a clip.

8. The anti-rotation device for the polished rod of a pumping unit well as described in claim 7, characterized in that, The clasp seated in the square clamp consists of two conical semicircles with inner clasp teeth, the upper outer circle of the two conical semicircles being larger than the lower outer circle of the conical semicircles; when the two conical semicircles of the clasp are engaged, the inner clasp teeth machined in the center hole of the clasp tightly mesh with the guide rod, and the center hole formed by the two conical semicircles is smaller than the outer circle of the guide rod.

9. The anti-rotation device for the polished rod of a pumping unit well as described in claim 7, characterized in that, The upper part of the guide rod through hole in the suspension device is provided with a bearing mounting cavity that is connected to the upper end face of the suspension device and concentric with the guide rod through hole.

10. The anti-rotation device for the polished rod of a pumping unit well as described in claim 9, characterized in that, In the suspension device, a radial bearing and a spherical bearing are installed between the bearing mounting cavity above the guide hole and the guide rod, from top to bottom.

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