Reactive torque eliminating device for screw rod column of screw pump

Abstract

A screw pump rod column reaction torque eliminating device relates to the technical field of oil well equipment and comprises an upper one-way clutch and a lower one-way clutch which are arranged in parallel from top to bottom, a driving rod is connected between the fixed end of the upper one-way clutch and the rotating end of the lower one-way clutch, and the rotating end of the upper one-way clutch is connected with the upper driving rod. And the fixed end of the lower one-way clutch is connected with the screw pump. The anti-reverse clutch solves the problems that in the prior art, after a rotor of a screw pump is stuck by sand, manual release is needed when a wellhead device needs to be disassembled during pump inspection operation, an operator needs to be close to the anti-reverse clutch, torque stored in a driving rod can be suddenly released, and large potential safety hazards are caused to the operator.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well equipment, in particular to a device for eliminating the reverse torque of a rod column of a screw pump. Background Art

[0002] In the existing screw pump oil production system, the ground drive device drives the drive rod to rotate and transmits the torque to the downhole screw pump for oil production. The screw pump is less than 1,000 meters underground, and the length of the drive rod that transmits the torque is also more than 1,000 meters. The drive rod is equivalent to a torsion bar spring. During normal operation, the drive rod stores energy under the action of torque and twists for hundreds of turns. When it stops for some reason, the drive rod releases energy and reverses the same number of turns, causing the drive rod to reverse at high speed after the screw pump oil production system stops, and also drives the ground drive device to reverse at high speed. The bare rod exposed on the upper part of the drive device sometimes bends, breaks and flies out, which can easily cause personal injury accidents. Therefore, the current screw pump oil production system is unsafe during production and has potential safety hazards.

[0003] In response to the above-mentioned problems, technicians installed an anti-reverse clutch on the ground drive device so that the reverse torque can be fixed on the drive device when it stops, and the bottom of the drive rod column can release the reverse torque by itself, thereby releasing the reverse torque on the drive rod.

[0004] As the existing devices are used, the shortcomings of the technology are gradually exposed, mainly in the following aspects:

[0005] When the rotor of the screw pump in the existing device is stuck by sand, the upper and lower ends of the drive rod are fixed, and the torque stored in the drive rod cannot be released. It needs to be released manually when the wellhead device is disassembled for pump inspection. The operator needs to get close to the anti-reverse clutch, and the torque stored in the drive rod will be suddenly released, which will cause great safety hazards to the operator.

[0006] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0007] In view of the defects in the prior art, the utility model solves the problem that in the traditional technology, when the rotor of the screw pump is stuck by sand, it needs to be released manually when the wellhead device is disassembled for pump inspection. The operator needs to approach the anti-reverse clutch, and the torque stored in the drive rod will be suddenly released, which will cause great safety hazards to the operator.

[0008] In order to solve the above problems, the utility model provides the following technical solutions:

[0009] The screw pump rod column anti-torque elimination device comprises an upper one-way clutch and a lower one-way clutch arranged in parallel from top to bottom.

[0010] A driving rod is connected between the fixed end of the upper one-way clutch and the rotating end of the lower one-way clutch.

[0011] The rotating end of the upper one-way clutch is connected to the upper driving rod, and the fixed end of the lower one-way clutch is connected to the screw pump.

[0012] As an optimized solution, the upper driving rod is connected to a driving device, and the driving device is connected to the casing through a wellhead device.

[0013] As an optimized solution, an anti-reverse clutch is connected to the upper driving rod, and a fixed end of the anti-reverse clutch is fixedly connected to the housing of the driving device.

[0014] As an optimized solution, the upper one-way clutch comprises a transmission tube, a transmission rod is rotatably mounted inside the transmission tube, and a one-way rotation limiting structure is provided between the transmission rod and the transmission tube.

[0015] As an optimized solution, the unidirectional rotation limiting structure includes a transmission key which slides radially along the transmission rod, the transmission tube is provided with an expansion cavity, the inner wall of the expansion cavity is provided with at least two arcuate inner walls evenly distributed along the circumferential direction, a limiting inner wall is provided between the head and tail of adjacent arcuate inner walls, the transmission key is provided with an arcuate outer wall which frictionally abuts against the arcuate inner wall, the transmission key is provided with a front side surface and a rear side surface along the rotation direction of the transmission rod, and the front side surface abuts against the limiting inner wall.

[0016] As an optimized solution, the transmission rod is provided with a key slot in the radial direction, the transmission key is slidably arranged in the key slot, and a spring is arranged in the key slot to resist the transmission key.

[0017] As an optimized solution, the transmission rod is provided with a diameter-reducing section, and the transmission rod is provided with a suspension joint, the suspension joint is threadedly connected to the upper end of the transmission tube, and the lower end of the suspension joint abuts against the diameter-reducing section.

[0018] As an optimized solution, the lower end of the transmission tube is threadedly connected with a lower joint, and the upper end of the lower joint abuts against the lower end of the transmission rod.

[0019] As an optimized solution, the upper end of the transmission rod is threadedly connected with an upper joint.

[0020] As an optimized solution, the upper one-way clutch has the same structure as the lower one-way clutch.

[0021] As an optimized solution, the lower end of the screw pump is connected to a pipe anchor.

[0022] As an optimized solution, the housing end of the screw pump is connected to the inner wall of the oil pipe.

[0023] As an optimized solution, the upper end of the oil pipe is suspended in the wellhead device.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] When the driving device drives the screw pump to work, the upper one-way clutch and the lower one-way clutch can transmit torque. When the screw pump is stuck and stops, the anti-reverse clutch fixes the upper drive rod, and the upper drive rod does not rotate. The upper one-way clutch and the lower one-way clutch cannot transmit torque, and the counter-torque on the drive rod will be released in the oil pipe, causing the torque on the upper drive rod to disappear. There is no torque when disassembling the driving device, and no personal injury accidents will occur, which has significant social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0027] Figure 1 It is a structural schematic diagram of the utility model.

[0028] Figure 2 It is a structural schematic diagram of the one-way clutch of the utility model.

[0029] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0030] Figure 4 The utility model transmission rod Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0031] Figure 5 The utility model transmission tube is Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0032] Figure 6 The utility model transmission key from Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0033] In the figure: 1-upper driving rod; 2-tension and torsion clip; 3-anti-reverse clutch; 4-driving device; 5-wellhead device; 6-casing; 7-oil pipe; 8-upper one-way clutch; 9-driving rod; 10-lower one-way clutch; 11-screw pump; 12-tubing anchor; 13-upper joint; 14-transmission rod; 14.1-keyway; 15-suspension joint; 16-transmission pipe; 16.1-limiting inner wall; 16.2-arc inner wall; 16.3-expansion cavity; 17-transmission key; 17.1-front side; 17.2-arc outer wall; 17.3-rear side; 18-spring; 19-lower joint. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0035] like Figures 1 to 6 As shown, the screw pump rod column anti-torque elimination device includes an upper one-way clutch 8 and a lower one-way clutch 10 arranged in parallel from top to bottom.

[0036] A driving rod 9 is connected between the fixed end of the upper one-way clutch 8 and the rotating end of the lower one-way clutch 10.

[0037] The rotating end of the upper one-way clutch 8 is connected to the upper driving rod 1 , and the fixed end of the lower one-way clutch 10 is connected to the screw pump 11 .

[0038] The upper driving rod 1 is connected to a driving device 4 , and the driving device 4 is connected to a casing 6 through a wellhead device 5 .

[0039] When the driving device 4 drives the upper driving rod 1 to rotate, the upper driving rod 1 can drive the upper one-way clutch 8, the driving rod 9, the lower one-way clutch 10, and the rotor of the screw pump 11 to rotate synchronously. When the driving rod 9 rotates after shutdown, the upper driving rod 1 and the rotor of the screw pump 11 do not rotate.

[0040] The upper driving rod 1 is connected with an anti-reverse clutch 3 , and the fixed end of the anti-reverse clutch 3 is fixedly connected to the housing of the driving device 4 .

[0041] The outside of the anti-reverse clutch 3 is fixed on the fixed part of the driving device 4, and the inside of the anti-reverse clutch 3 is fixed on the rotating shaft of the driving device 4. The tension and torsion clip 2 clamps the upper driving rod 1 and sits on the rotating shaft of the driving device 4, so that the upper driving rod 1 can rotate with the rotating shaft of the driving device 4.

[0042] The function of the anti-reverse clutch 3 is to enable the upper drive rod 1 to rotate forward but not reverse.

[0043] The upper one-way clutch 8 comprises a transmission tube 16 , in which a transmission rod 14 is rotatably mounted, and a one-way rotation limiting structure is provided between the transmission rod 14 and the transmission tube 16 .

[0044] The unidirectional rotation limiting structure includes a transmission key 17 that slides radially along the transmission rod 14 and cannot move axially or rotate radially. The transmission tube 16 is provided with an expansion cavity 16.3. The inner wall of the expansion cavity 16.3 is evenly distributed with at least two arcuate inner walls 16.2 along the circumferential direction. A limiting inner wall 16.1 is provided between the head and tail of adjacent arcuate inner walls 16.2. The transmission key 17 is provided with an arcuate outer wall 17.2 that frictionally abuts against the arcuate inner wall 16.2. The transmission key 17 is provided with a front side surface 17.1 and a rear side surface 17.3 along the rotation direction of the transmission rod 14, and the front side surface 17.1 abuts against the limiting inner wall 16.1.

[0045] The arc-shaped outer wall 17.2 is coaxially arranged with the arc-shaped inner wall 16.2.

[0046] The transmission rod 14 is provided with a key slot 14.1 in the radial direction, a transmission key 17 is slidably disposed in the key slot 14.1, and a spring 18 is disposed in the key slot 14.1 to abut against the transmission key 17.

[0047] When the transmission rod 14 rotates forward, the spring 18 pushes the transmission key 17 so that the upper one-way clutch 8 can transmit torque. When the transmission rod 14 rotates reversely, the transmission key 17 retracts into the key slot 14.1 under the action of the arcuate outer wall 17.2 and the arcuate inner wall 16.2, and the upper one-way clutch 8 cannot transmit torque.

[0048] The transmission rod 14 is provided with a diameter reducing section, and the transmission rod 14 is sleeved with a suspension joint 15, the suspension joint 15 is threadedly connected to the upper end of the transmission tube 16, and the lower end of the suspension joint abuts against the diameter reducing section.

[0049] The lower end of the transmission tube 16 is threadedly connected with a lower joint 19 , and the upper end of the lower joint 19 abuts against the lower end of the transmission rod 14 .

[0050] The upper end of the transmission rod 14 is threadedly connected with the upper joint 13 .

[0051] The upper joint 13 and the suspension joint 15 prevent the transmission rod 14 and the transmission tube 16 from axial movement.

[0052] Two transmission keys 17 and springs 18 are symmetrically arranged on the transmission rod 14 , and two key slots 14 . 1 are symmetrically arranged on the transmission rod 14 .

[0053] The upper one-way clutch 8 and the lower one-way clutch 10 have the same structure.

[0054] The lower end of the screw pump 11 is connected to the pipe anchor 12 to prevent the connecting thread of the oil pipe 7 from being disengaged during the production of the screw pump 11.

[0055] The housing end of the screw pump 11 is connected to the inner wall of the oil pipe 7 .

[0056] The upper end of the oil pipe 7 is suspended in the wellhead device 5 .

[0057] The working principle of this device is:

[0058] When the driving device 4 drives the screw pump 11 to work, the upper one-way clutch 8 and the lower one-way clutch 10 can transmit torque. When the screw pump 11 is stuck and stopped, the anti-reverse clutch 3 fixes the upper driving rod 1, and the upper driving rod 1 will not rotate. The upper one-way clutch 8 and the lower one-way clutch 10 cannot transmit torque, and the counter-torque on the driving rod 9 will be released in the oil pipe 7, so that the torque on the upper driving rod 1 disappears. There is no torque when the driving device 4 is disassembled, and no personal injury accidents will occur, which has significant social benefits.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. The screw pump rod column anti-torque elimination device is characterized by: The invention comprises an upper one-way clutch (8) and a lower one-way clutch (10) which are arranged in parallel from top to bottom, wherein a driving rod (9) is connected between the fixed end of the upper one-way clutch (8) and the rotating end of the lower one-way clutch (10). The rotating end of the upper one-way clutch (8) is connected to the upper driving rod (1), and the fixed end of the lower one-way clutch (10) is connected to the screw pump (11). The upper driving rod (1) is connected to a driving device (4), and the driving device (4) is connected to a casing (6) via a wellhead device (5). The upper driving rod (1) is connected to an anti-reverse clutch (3), and the fixed end of the anti-reverse clutch (3) is fixedly connected to the outer shell of the driving device (4).

2. The screw pump rod column anti-torque elimination device according to claim 1, characterized in that: The upper one-way clutch (8) comprises a transmission tube (16), a transmission rod (14) is rotatably mounted inside the transmission tube (16), and a one-way rotation limiting structure is provided between the transmission rod (14) and the transmission tube (16).

3. The screw pump rod column anti-torque elimination device according to claim 2, characterized in that: The one-way rotation limiting structure comprises a transmission key (17) which slides radially along the transmission rod (14); the transmission tube (16) is provided with an expansion cavity (16.3); at least two arcuate inner walls (16.2) are evenly distributed on the inner wall of the expansion cavity (16.3) along the circumferential direction; a limiting inner wall (16.1) is provided between the head and tail of adjacent arcuate inner walls (16.2); the transmission key (17) is provided with an arcuate outer wall (17.2) which frictionally abuts against the arcuate inner wall (16.2); the transmission key (17) is provided with a front side surface (17.1) and a rear side surface (17.3) along the rotation direction of the transmission rod (14); the front side surface (17.1) abuts against the limiting inner wall (16.1).

4. The device for eliminating the reverse torque of the rod column of a screw pump according to claim 3, characterized in that: The transmission rod (14) is provided with a keyway (14.1) in the radial direction, the transmission key (17) is slidably arranged in the keyway (14.1), and a spring (18) is arranged in the keyway (14.1) to abut against the transmission key (17).

5. The device for eliminating the reverse torque of the rod column of a screw pump according to claim 2, characterized in that: The transmission rod (14) is provided with a diameter-reducing section, and the transmission rod (14) is sleeved with a suspension joint (15), the suspension joint (15) is threadedly connected to the upper end of the transmission tube (16), and the lower end of the suspension joint (15) abuts against the diameter-reducing section.

6. The device for eliminating the reverse torque of the rod column of a screw pump according to claim 2, characterized in that: The lower end of the transmission tube (16) is threadedly connected to a lower joint (19), and the upper end of the lower joint (19) abuts against the lower end of the transmission rod (14).

7. The device for eliminating the reverse torque of the rod column of a screw pump according to claim 2, characterized in that: The upper end portion of the transmission rod (14) is threadedly connected to an upper joint (13).

8. The device for eliminating the reverse torque of the rod column of a screw pump according to claim 1, characterized in that: The upper one-way clutch (8) and the lower one-way clutch (10) have the same structure.

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