High-adaptability sucker rod anti-falling device

Abstract

The utility model relates to a high adaptability sucker rod anti -unhooking device belongs to petroleum exploitation equipment technical field. The utility model solves the problem of the prior art sucker rod anti -unhooking device poor adaptability, complex structure and the unstable problem of anti -unhooking effect. Including first transmission shaft, second transmission shaft, first lock sleeve, second lock sleeve, transmission sleeve, floating key and a plurality of reset springs, a plurality of reset springs are correspondingly installed in a plurality of spring grooves, the floating key is arranged between a plurality of reset springs and the transmission sleeve inner wall, the other end of second transmission shaft is threadedly connected with pumping coupling, and the pumping coupling is connected to the output end of the oil pumping pump through the auxiliary rod. The utility model has the advantages of strong universality, wide adaptability, simple structure, convenient installation, good anti -unhooking effect, high reliability and low maintenance cost.

Description

Technical Field

[0001] This utility model relates to a highly adaptable sucker rod anti-detachment device, belonging to the technical field of oil extraction equipment. Background Technology

[0002] In oil extraction, screw pump wells are widely used due to their high efficiency in oil production. However, the sucker rod is subjected to multi-directional forces under complex working conditions, making it prone to disengagement and causing production interruptions. Existing anti-disengagement devices have the following significant drawbacks: 1. Complex structure and high installation and maintenance costs: For example, some devices (patent number ZL 200520085312.3 "Retractable Screw Pump Sucker Rod Anti-Disengagement Device") include multiple components such as a clutch body (including a reverse-clamping cavity, an anti-disengagement cavity, and other helical inner cavities), a plug, and a clutch rod, all of which require precise fitting; other devices (authorization announcement number CN 206487422 U "Screw Pump Sucker Rod Anti-Disengagement Device") involve precision structures such as bearings, involute grooves, and torque adjustment rings, requiring professional personnel for installation and commissioning, increasing time and costs. 2. Unstable anti-detachment effect: Some devices rely on the clutch-like switching of complex cavities or grooves (such as the spiral structure of the cavity in the "Retractable Screw Pump Sucker Rod Anti-Detachment Device"), which are susceptible to wear, sand particles, etc., leading to anti-detachment failure. 3. Poor adaptability: Different models of equipment require different anti-detachment devices, resulting in poor versatility and difficulty in meeting diverse production needs. Therefore, there is an urgent need for a sucker rod anti-detachment device that is simple in structure, easy to install, reliable in preventing detachment, and highly adaptable. Utility Model Content

[0003] The present invention aims to solve the above-mentioned technical problems and provide a highly adaptable sucker rod anti-detachment device.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] A highly adaptable sucker rod anti-disengagement device includes a first drive shaft, a second drive shaft, a first locking sleeve, a second locking sleeve, a transmission sleeve, a floating key, and several return springs. One end of the first drive shaft is threadedly connected to one end of the transmission sleeve. The second drive shaft is mounted on the other end of the transmission sleeve. The first locking sleeve is coaxially and axially slidably fitted onto the first drive shaft, and one end of the first locking sleeve has an internal thread. The second locking sleeve is sealed and coaxially rotatably fitted onto the middle of the second drive shaft, and one end of the second locking sleeve is threadedly connected to the other end of the transmission sleeve. One end of the second drive shaft has an internal thread. The device is equipped with a limiting groove and several spring grooves. The limiting groove is opened along the axial direction of the second drive shaft, and the several spring grooves are distributed along the axial direction of the second drive shaft, with the opening end of each spring groove communicating with the bottom of the limiting groove. The inner wall of the other end of the drive sleeve is machined with a L-shaped clamping platform. The two ends of the L-shaped clamping platform are integrally formed with the inner wall of the drive sleeve. Several return springs are correspondingly installed in the several spring grooves. A floating key is arranged between the several return springs and the inner wall of the drive sleeve. The other end of the second drive shaft is threadedly connected to a pumping coupling, which is connected to the output end of the pumping pump through an auxiliary rod.

[0006] Furthermore, the second locking sleeve includes a threaded section and a limiting section arranged coaxially. The threaded section is threaded between the transmission sleeve and the second transmission shaft, and the limiting section abuts against the other end of the transmission sleeve. The inner wall of the limiting section is provided with a first annular groove, and an O-ring is installed in the first annular groove.

[0007] Furthermore, a second annular groove is provided on the second transmission shaft located inside the transmission sleeve, and a retaining ring is coaxially installed in the second annular groove, with the retaining ring abutting against one end of the second locking sleeve.

[0008] Furthermore, the retaining ring has a semi-ring structure.

[0009] Furthermore, the second locking sleeve is welded to the connection point of the transmission sleeve.

[0010] Furthermore, one end of the first drive shaft is fitted onto one end of the drive sleeve.

[0011] Furthermore, the first drive shaft includes a coaxial and integrally formed connecting section and a mating section, the first locking sleeve is fitted onto the mating section with clearance fit, and one end of the mating section is threadedly connected to the drive sleeve.

[0012] Furthermore, the end of the connecting section furthest from the mating section is flattened and conical.

[0013] Furthermore, the diameter of the mating section is smaller than the large diameter of the connecting section, and the first locking sleeve has a threaded hole and a smooth hole machined inside, wherein the diameter of the smooth hole is smaller than the large diameter of the connecting section, and the large diameter of the connecting section is smaller than the diameter of the threaded hole.

[0014] Furthermore, weight-reducing holes are machined on the first drive shaft, the second drive shaft, and the first locking sleeve.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] In this highly adaptable sucker rod anti-detachment device, each component achieves the anti-detachment function through mechanical linkage, without complex cavities or precision-machined parts, and the structure has a clear hierarchy.

[0017] This utility model's highly adaptable sucker rod anti-detachment device is highly versatile and widely adaptable. Its structural design does not depend on a specific model of sucker pump or sucker rod, and it can be adapted to various equipment through simple size adjustments, solving the problem of poor compatibility with existing equipment models.

[0018] This utility model's highly adaptable sucker rod anti-derailment device has a simple structure, is easy to install, has a good anti-derailment effect, high reliability, and low maintenance cost. It effectively improves the stability and safety of sucker rod operation and reduces production interruptions and equipment damage caused by derailment.

[0019] This utility model's highly adaptable sucker rod anti-detachment device has a simple structure. Compared with the prior art, it has no complex cavities, bearings, or precision grooves, and can be installed without professional tools. During maintenance, only vulnerable parts such as floating keys and reset springs need to be inspected or replaced, resulting in lower costs and higher efficiency.

[0020] The highly adaptable sucker rod anti-detachment device of this utility model is based on the direct rotational separation of the second drive shaft and the drive sleeve. Compared with the prior art, it does not rely on complex cavity fit or groove sliding, and is less affected by working conditions such as wear and sand particles, and has a higher success rate in preventing detachment. Attached Figure Description

[0021] Figure 1 This is a partial cross-sectional schematic diagram of the highly adaptable sucker rod anti-detachment device of this utility model;

[0022] Figure 2 for Figure 1 A schematic cross-sectional view along line AA (not to scale);

[0023] Figure 3 This is a front view schematic diagram of the first drive shaft;

[0024] Figure 4 for Figure 3 A top-down view (partial);

[0025] Figure 5 This is a half-sectional schematic diagram of the first locking sleeve;

[0026] Figure 6 This is a schematic sectional view of the transmission sleeve.

[0027] Figure 7 for Figure 6 A schematic diagram of the BB direction;

[0028] Figure 8 This is a schematic diagram of the clasp structure;

[0029] Figure 9 This is a half-sectional schematic diagram of the second locking sleeve;

[0030] Figure 10 This is a front view (partial sectional view) of the second drive shaft.

[0031] Figure 11 for Figure 10 A top-down view;

[0032] Figure 12 for Figure 11 CC-direction cross-sectional view.

[0033] In the picture:

[0034] 1. First drive shaft; 11. Connecting section; 12. Mating section; 2. Second drive shaft; 21. Limiting groove; 22. Spring groove; 23. Second annular groove; 3. First locking sleeve; 31. Threaded hole; 32. Plain hole; 4. Second locking sleeve; 41. Threaded section; 42. Limiting section; 421. First annular groove; 5. Drive sleeve; 51. Clamping platform; 6. Floating key; 7. Return spring; 8. O-ring seal; 9. Snap ring. Detailed Implementation

[0035] Specific implementation method one: Combining Figures 1-12 This description aims to clearly and completely describe the technical solutions in this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] It should be noted that the descriptions of "front," "rear," "left," "right," "inner," "outer," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this utility model are defined based on the orientation or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0037] In the description of this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] A highly adaptable sucker rod anti-disengagement device includes a first drive shaft 1, a second drive shaft 2, a first locking sleeve 3, a second locking sleeve 4, a drive sleeve 5, a floating key 6, and several return springs 7. One end of the first drive shaft 1 is threadedly connected to one end of the drive sleeve 5. The second drive shaft 2 is mounted on the other end of the drive sleeve 5. The first locking sleeve 3 is coaxially and axially slidingly fitted onto the first drive shaft 1, and one end of the first locking sleeve 3 has an internal thread. The second locking sleeve 4 is sealed and coaxially rotatably fitted onto the middle of the second drive shaft 2, and one end of the second locking sleeve 4 is threadedly connected to the other end of the drive sleeve 5. A limit switch is provided at one end of the second drive shaft 2. The transmission sleeve 5 has a groove 21 and several spring grooves 22, wherein the limiting groove 21 is opened along the axial direction of the second transmission shaft 2, and several spring grooves 22 are distributed along the axial direction of the second transmission shaft 2, and the opening end of each spring groove 22 is connected to the bottom of the limiting groove 21. The inner wall of the other end of the transmission sleeve 5 is machined with a locking platform 51 with an L-shaped cross section. The two ends of the L-shaped locking platform 51 are integrally formed with the inner wall of the transmission sleeve 5. Several return springs 7 are correspondingly installed in several spring grooves 22. A floating key 6 is arranged between several return springs 7 and the inner wall of the transmission sleeve 5. The other end of the second transmission shaft 2 is threadedly connected to a pumping coupling, which is connected to the output end of the pumping pump through an auxiliary rod.

[0039] By replacing the oil pump couplings of different sizes, the highly adaptable sucker rod anti-detachment device of this utility model can be applied to various sizes of oil pumps.

[0040] The auxiliary rod is threadedly connected to the sucker rod coupling and the sucker pump. The other end of the second drive shaft 2 is machined with an external thread for threaded connection to the sucker rod coupling. The sucker rod coupling is a conventional coupling structure. An internal thread at one end of the first locking sleeve 3 is used to connect the sucker rod. During assembly, the first locking sleeve 3 is slid axially until one end disengages from the first drive shaft 1, and then the sucker rod is threadedly connected to one end of the first locking sleeve 3, thus achieving the connection between the highly adaptable sucker rod anti-detachment device and the sucker rod. When the anti-detachment device is not in use, the first locking sleeve 3 slides axially back onto the first drive shaft 1, shortening the overall length of the anti-detachment device for easy storage.

[0041] The depth direction of the limiting groove 21 is arranged radially along the second drive shaft 2.

[0042] The L-shaped ends of the card table 51 are integrally formed with the inner wall of the transmission sleeve 5, forming an internal ratchet structure.

[0043] Working principle of anti-hair loss mechanism:

[0044] The second drive shaft 2 and the second locking sleeve 4 are in transition fit, and the mating position between the second locking sleeve 4 and the drive sleeve 5 can be reinforced by welding.

[0045] A floating key 6 is positioned between several return springs 7 and the inner wall of the transmission sleeve 5. When the floating key 6 rotates clockwise with the second transmission shaft 2 to the L-shaped clamping platform 51, it locks into place at the corner of the platform 51. Under the action of the floating key 6, the first transmission shaft 1, the second transmission shaft 2, and the transmission sleeve 5 rotate synchronously, ensuring stable torque transmission and not affecting normal oil production. In cases of shutdown torque release, the sucker rod reverses direction, and the second transmission shaft 2 rotates independently within the transmission sleeve 5, while the transmission sleeve 5 remains stationary. The rotational separation of the second transmission shaft 2 and the transmission sleeve 5 directly prevents disengagement, a direct and efficient principle.

[0046] When the pump rotates forward, it drives the second drive shaft 2 to rotate clockwise. When it rotates in reverse, the second drive shaft 2 idles, releasing torque. This prevents downhole accidents caused by the sucker rod breaking due to torque, ensuring production continuity and equipment safety.

[0047] When the torque release function is shut down, the torque generated by the inertia of the sucker rod can be naturally released through the rotational separation characteristics of the anti-detachment mechanism, avoiding sucker rod breakage caused by torque accumulation and reducing downhole accidents at the source.

[0048] The floating key 6 and the return spring 7 can be either fixedly connected or loosely connected.

[0049] The second locking sleeve 4 is sealed and coaxially rotatable, mounted in the middle of the second drive shaft 2. The sealing design effectively prevents oil from leaking into the anti-detachment device, ensuring internal lubrication and external cleanliness.

[0050] In this highly adaptable sucker rod anti-detachment device, each component achieves the anti-detachment function through mechanical linkage, without complex cavities or precision-machined parts, and the structure has a clear hierarchy.

[0051] This utility model's highly adaptable sucker rod anti-detachment device is highly versatile and widely adaptable. Its structural design does not depend on a specific model of sucker pump or sucker rod, and it can be adapted to various equipment through simple size adjustments, solving the problem of poor compatibility with existing equipment models.

[0052] This utility model's highly adaptable sucker rod anti-derailment device has a simple structure, is easy to install, has a good anti-derailment effect, high reliability, and low maintenance cost. It effectively improves the stability and safety of sucker rod operation and reduces production interruptions and equipment damage caused by derailment.

[0053] The highly adaptable sucker rod anti-detachment device of this utility model has a simple structure. Compared with the prior art, it has no complex cavity, bearing or precision groove, and can be installed without professional tools. During maintenance, only vulnerable parts such as floating key 6 and reset spring 7 need to be checked or replaced, which is more cost-effective and efficient.

[0054] The highly adaptable sucker rod anti-detachment device of this utility model is based on the direct rotational separation of the second drive shaft 2 and the drive sleeve 5. Compared with the prior art, it does not rely on complex cavity fit or groove sliding, and is less affected by working conditions such as wear and sand particles, and has a higher success rate in preventing detachment.

[0055] The second locking sleeve 4 includes a threaded section 41 and a limiting section 42 arranged coaxially. The threaded section 41 is threaded between the transmission sleeve 5 and the second transmission shaft 2. The limiting section 42 abuts against the other end of the transmission sleeve 5, and a first annular groove 421 is formed on the inner wall of the limiting section 421, in which an O-ring seal 8 is installed. This design achieves sealing between the second locking sleeve 4 and the second transmission shaft 2 through the O-ring seal 8, and axial limiting between the second locking sleeve 4 and the transmission sleeve 5 through the limiting section 42. The tight fit between the O-ring seal 8 and the second transmission shaft 2 forms a sealing barrier, effectively preventing oil leakage and ensuring internal lubrication and external environmental cleanliness. Compared to existing technologies, the sealing path is clearer, the sealing structure is simpler, and the sealing effect is more stable.

[0056] A second annular groove 23 is also provided on the second drive shaft 2 located inside the transmission sleeve 5. A retaining ring 9 is coaxially installed in the second annular groove 23, and the retaining ring 9 abuts against one end of the second locking sleeve 4. With this design, since the fixed connection between the second locking sleeve 4 and the second drive shaft 2 needs to be performed before the second drive shaft 2 is inserted into the transmission sleeve 5, the retaining ring 9 is used to limit the installation position of the second locking sleeve 4 in order to ensure the accurate connection position between the transmission sleeve 5, the second locking sleeve 4 and the second drive shaft 2.

[0057] The retaining ring 9 has a semi-ring structure. This design facilitates installation and disassembly.

[0058] The second locking sleeve 4 and the transmission sleeve 5 are welded together.

[0059] One end of the first drive shaft 1 is fitted onto one end of the drive sleeve 5.

[0060] The first drive shaft 1 includes a coaxial and integrally formed connecting section 11 and a mating section 12. The first locking sleeve 3 is fitted onto the mating section 12 with clearance fit, and one end of the mating section 12 is threadedly connected to the drive sleeve 5.

[0061] The end of the connecting section 11 furthest from the mating section 12 is flat and conical. This design, by setting the flat and conical structure, facilitates radial restraint of the sucker rod when connecting the first locking sleeve 3 to the sucker rod, making the threaded connection process between the sucker rod and the first locking sleeve smoother. After the first locking sleeve and the sucker rod are threadedly connected, the sucker rod naturally disengages from the first drive shaft.

[0062] The diameter of the mating section 12 is smaller than the large diameter of the connecting section 11. The first locking sleeve 3 has a threaded hole 31 and a smooth hole 32 machined inside. The diameter of the smooth hole 32 is smaller than the large diameter of the connecting section 11, and the large diameter of the connecting section 11 is smaller than the diameter of the threaded hole 31. This design effectively prevents the first locking sleeve 3 from detaching from the first drive shaft 1 when it is connected to the sucker rod, thus providing axial positioning for the first locking sleeve 3.

[0063] Weight-reducing holes are machined on the first drive shaft 1, the second drive shaft 2, and the first locking sleeve 3. This design greatly reduces the overall weight of the anti-detachment device.

[0064] Assembly method:

[0065] The first locking sleeve 3 is slid along the first drive shaft 1 until one end of it is disengaged from the first drive shaft 1. At the same time, the sucker rod is connected to the first drive shaft 1. Then, the first locking sleeve 3 is slid further until the internal thread on the first locking sleeve 3 engages with the external thread on the sucker rod, thus realizing the threaded connection between the first drive shaft 1 and the first locking sleeve 3. After the threaded connection between the first drive shaft 1 and the first locking sleeve 3 is completed, the first drive shaft 1 is completely disengaged from the sucker rod.

[0066] Connect the second drive shaft 2 to a suitable size oil suction coupling, and then connect the oil suction coupling to the oil pump via an auxiliary rod;

[0067] Install an O-ring 8 inside the second locking sleeve 4, then fit the second locking sleeve 4 from one end of the second drive shaft 2 to the middle section of the second drive shaft 2, then install a retaining ring 9, and then place one end of the second locking sleeve 4 against the end of the retaining ring 9 for limiting the position;

[0068] Assemble the reset spring 7 and floating key 6 into the corresponding spring groove 22 and limit groove 21 to ensure that the reset spring 7 is in a pre-tightened state. Then, insert the second drive shaft 2 into the drive sleeve 5 and screw the drive sleeve 5 and the second locking sleeve 4 together. After screwing, the joint between the drive sleeve 5 and the second locking sleeve 4 can also be welded.

[0069] Check the tightness of all component connections; no adjustments are required before use.

[0070] Maintenance methods: After going down into the well, check the sealing performance of the O-ring 8 every 6 months. Replace it in time if it is aged or damaged. Regularly check the fit between the floating key 6 and the retaining ring 9 to ensure that there is no looseness or wear. Replace it if necessary. Clean the inside of the transmission sleeve 5 regularly to avoid the accumulation of oil stains that affect the rotation flexibility.

[0071] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A highly adaptable sucker rod anti-derailment device, characterized in that: The system includes a first drive shaft (1), a second drive shaft (2), a first locking sleeve (3), a second locking sleeve (4), a transmission sleeve (5), a floating key (6), and several return springs (7). One end of the first drive shaft (1) is threadedly connected to one end of the transmission sleeve (5). The second drive shaft (2) is mounted on the other end of the transmission sleeve (5). The first locking sleeve (3) is coaxially and axially slidingly fitted onto the first drive shaft (1), with an internal thread at one end. The second locking sleeve (4) is sealed and coaxially rotatably fitted onto the middle of the second drive shaft (2), with one end of the second locking sleeve (4) threadedly connected to the other end of the transmission sleeve (5). A limit groove (21) is provided at one end of the second drive shaft (2). A number of spring grooves (22) are provided, wherein the limiting groove (21) is opened along the axial direction of the second transmission shaft (2), and the opening end of each spring groove (22) is connected to the bottom of the limiting groove (21). The inner wall of the other end of the transmission sleeve (5) is machined with a L-shaped clamping platform (51). The two ends of the L-shaped clamping platform (51) are integrally formed with the inner wall of the transmission sleeve (5). A number of return springs (7) are correspondingly installed in the number of spring grooves (22). The floating key (6) is arranged between the number of return springs (7) and the inner wall of the transmission sleeve (5). The other end of the second transmission shaft (2) is threaded with an oil pump coupling. The oil pump coupling is connected to the output end of the oil pump through an auxiliary rod.

2. The highly adaptable sucker rod anti-detachment device according to claim 1, characterized in that: The second locking sleeve (4) includes a threaded section (41) and a limiting section (42) arranged coaxially. The threaded section (41) is threaded between the transmission sleeve (5) and the second transmission shaft (2). The limiting section (42) abuts against the other end of the transmission sleeve (5). The inner wall of the limiting section (42) is provided with a first annular groove (421), and an O-ring seal (8) is installed in the first annular groove (421).

3. The highly adaptable sucker rod anti-detachment device according to claim 1, characterized in that: A second annular groove (23) is provided on the second transmission shaft (2) located inside the transmission sleeve (5). A retaining ring (9) is coaxially installed in the second annular groove (23), and the retaining ring (9) abuts against one end of the second locking sleeve (4).

4. The highly adaptable sucker rod anti-detachment device according to claim 3, characterized in that: The retaining ring (9) is a semi-ring structure.

5. The highly adaptable sucker rod anti-derailment device according to claim 1, characterized in that: The second locking sleeve (4) is welded to the transmission sleeve (5).

6. The highly adaptable sucker rod anti-derailment device according to claim 1, characterized in that: One end of the first drive shaft (1) is fitted onto one end of the drive sleeve (5).

7. The highly adaptable sucker rod anti-derailment device according to claim 1, characterized in that: The first drive shaft (1) includes a coaxial and integrally formed connecting section (11) and a mating section (12). The first locking sleeve (3) is fitted onto the mating section (12) with clearance fit, and one end of the mating section (12) is threadedly connected to the drive sleeve (5).

8. A highly adaptable sucker rod anti-derailment device according to claim 7, characterized in that: The end of the connecting section (11) that is far from the mating section (12) is flat and conical.

9. A highly adaptable sucker rod anti-derailment device according to claim 7, characterized in that: The diameter of the mating section (12) is smaller than the large diameter of the connecting section (11). The first locking sleeve (3) has a threaded hole (31) and a smooth hole (32) inside. The diameter of the smooth hole (32) is smaller than the large diameter of the connecting section (11), and the large diameter of the connecting section (11) is smaller than the diameter of the threaded hole (31).

10. A highly adaptable sucker rod anti-derailment device according to claim 1, characterized in that: Weight reduction holes are machined on the first drive shaft (1), the second drive shaft (2), and the first locking sleeve (3).

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