Rolling type sucker rod centralizer

Abstract

A rolling type sucker rod centralizer relates to the technical field of oil field downhole tools and comprises a cylindrical body, the upper end of the cylindrical body is an upper connector, and the lower end of the cylindrical body is a lower connector. The upper portion of the cylindrical body is sleeved with a sliding centralizing body, the lower portion of the cylindrical body is sleeved with a fixed centralizing body, overflowing grooves A are formed in the outer wall of the fixed centralizing body at equal intervals, overflowing grooves B are formed in the outer wall of the sliding centralizing body at equal intervals, and the overflowing grooves A and the overflowing grooves B are arranged in a staggered mode. The overflowing groove A is blocked by the sliding centralizing body, the overflowing groove B is blocked by the fixed centralizing body, in the down stroke, the sliding centralizing body is separated from the fixed centralizing body, lower oil liquid can pass through the overflowing groove A and the overflowing groove B, in the up stroke, the sliding centralizing body and the fixed centralizing body tightly abut against each other to form sealing, upper oil liquid is lifted by the two centralizing bodies, and the upper oil liquid can pass through the overflowing groove A and the overflowing groove B; the lifting load of the oil well pump is reduced, and the pumping assisting effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield downhole tool technology, and in particular relates to a rolling sucker rod centralizer. Background Technology

[0002] In oil extraction operations, oil pumping machines use sucker rods to reciprocate up and down inside sucker tubing to extract oil. The length of the sucker tubing is mainly determined by the depth of the oil well, sometimes reaching several kilometers. Due to the long length of the sucker tubing, the sucker rod inevitably sways and bends during its up-and-down movement, generating friction with the sucker tubing. Simultaneously, the sucker rods are connected by couplings, which also rub against the sucker tubing. This can lead to damage to the sucker tubing, sucker rods, and couplings. The most effective way to solve the friction problem is to install a centralizer on the sucker rod. The centralizer is connected to the sucker rod and utilizes the principle that the outer diameter of the centralizer is larger than the outer diameter of the sucker rod coupling to provide a straightening effect. The centralizer contacts and wears against the tubing, reducing wear on the tubing.

[0003] Existing sucker rod centralizers have limited functionality, with most only having a centralizing function and a few also having a wax scraping function. Therefore, the goal of this application is to develop a sucker rod centralizer with more diverse functions. Utility Model Content

[0004] This utility model provides a rolling sucker rod centralizer. This utility model has multiple functions, including centralizing, wax scraping, and pumping assistance, making it a highly practical sucker rod centralizer.

[0005] The technical solution provided by this utility model is: a rolling sucker rod centralizer, including a cylindrical body, with an upper connector at the upper end of the cylindrical body and a lower connector at the lower end of the cylindrical body, the upper connector and the lower connector being connected to the sucker rod respectively;

[0006] A sliding stabilizer is fitted onto the upper part of the columnar body, and a fixed stabilizer is fitted onto the lower part of the columnar body. The sliding stabilizer slides between the upper connector and the fixed stabilizer. The outer wall of the fixed stabilizer has equally spaced flow grooves A, and the outer wall of the sliding stabilizer has equally spaced flow grooves B. The flow grooves A and B are offset. When the sliding stabilizer and the fixed stabilizer come into contact, the flow groove A is blocked by the sliding stabilizer, and the flow groove B is blocked by the fixed stabilizer. During the downstroke, the sliding stabilizer and the fixed stabilizer separate, and the oil below can pass through the flow grooves A and B. During the upstroke, the sliding stabilizer and the fixed stabilizer come into close contact to form a seal, and the oil above is lifted by the two stabilizers, reducing the lifting load of the pump and thus playing a role in assisting pumping.

[0007] A further technical solution is as follows: the outer wall of the column corresponding to the sliding centralizer is provided with an axial groove, which is called a ball groove. The outer wall of the sliding centralizer is provided with a ball mounting hole, in which a ball and a plug are provided. The plug is fixedly connected to the ball mounting hole, and the plug encapsulates the ball in the ball mounting hole. The ball slides in the ball groove, so that the sliding centralizer can only slide up and down relative to the column and cannot rotate relative to the column. Compared with the stroke distance of the sucker rod, the range of motion of the sliding centralizer is much smaller. In addition, the rolling contact between the sliding centralizer and the column through the ball greatly reduces the friction and causes little damage to the column.

[0008] A further technical solution is as follows: the fixed support body and the column are connected by a key, so that the fixed support body cannot rotate relative to the column; the column has a limiting step, and the upper end of the fixed support body abuts against the limiting step, thereby restricting the fixed support body from sliding upward relative to the column; a retaining ring is fixedly provided on the column below the fixed support body, and the lower end of the fixed support body abuts against the retaining ring, thereby restricting the fixed support body from sliding downward relative to the column.

[0009] A further technical solution is: the outer wall of the fixed stabilizer is provided with an annular groove A, which connects the flow groove A; the outer wall of the sliding stabilizer is also provided with an annular groove B, which connects the flow groove B. The annular groove A and the annular groove B serve to connect the oil and further serve to scrape the wax.

[0010] A further technical solution is: an elastic sealing gasket is provided on the upper end face of the fixed stabilizer, and an elastic sealing gasket is also provided on the lower end face of the sliding stabilizer. When the sliding stabilizer and the fixed stabilizer are in contact, the two elastic sealing gaskets are tightly pressed against each other, and the elastic sealing gaskets have a better sealing effect on the flow groove A and the flow groove B.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. During the downstroke of this application, due to the upward friction of the tubing wall against the sliding stabilizer, and the upward direction of the oil flowing through the sliding stabilizer, the sliding stabilizer is pushed upward under the combined action of oil thrust and friction, separating from the fixed stabilizer. The seal between the two is released, and the lower oil can pass through flow groove A and flow groove B in sequence. During the upstroke, the downward friction of the tubing wall against the sliding stabilizer, and the downward direction of gravity of the upper oil, pushes the sliding stabilizer downward, tightly abutting against the fixed stabilizer. The seal between the two is re-established, and flow grooves A and B are blocked. The upper oil cannot pass through flow grooves A and B, but is lifted upward by the two stabilizers. The load on the pump is greatly reduced, thus assisting in pumping.

[0013] 2. The sliding straightener of this application has a certain range of motion, so compared with other straighteners, this application has a longer straightening range and a better straightening effect.

[0014] 3. The positions of the flow groove B on the outer wall of the sliding straightener and the flow groove A on the outer wall of the fixed straightener are misaligned, so this application still has a 360-degree wax scraping function. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model, at which point the sliding stabilizer and the fixed stabilizer are separated.

[0016] Figure 2 This is a schematic diagram of the overall structure of this utility model. At this time, the sliding straightening body and the fixed straightening body are in close contact.

[0017] Figure 3 This is a cross-sectional view of the fixing and straightening body in this utility model.

[0018] Figure 4 This is a cross-sectional view of the sliding straightening body in this utility model.

[0019] Figure 5 yes Figure 1 A magnified view of a section at point I.

[0020] In the diagram: 1. Oil pipe; 2. Annular groove B; 3. Sliding stabilizer; 4. Elastic sealing gasket; 5. Annular groove A; 6. Fixed stabilizer; 7. Retaining ring; 8. Flow groove A; 9. Columnar body; 901. Upper connector; 902. Lower connector; 903. Ball groove; 10. Flow groove B; 11. Ball mounting hole; 12. Plug; 13. Ball. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects 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.

[0022] This embodiment includes a columnar body 9 in terms of structure. The upper end of the columnar body 9 has an upper connector 901, and the lower end of the columnar body 9 has a lower connector 902. The upper connector 901 and the lower connector 902 are respectively connected to the sucker rod. That is, this application is connected to the sucker rod as a separate section.

[0023] A sliding stabilizer 3 is fitted onto the upper part of the columnar body 9, and a fixed stabilizer 6 is fitted onto the lower part of the columnar body 9. The sliding stabilizer 3 slides between the upper connector 901 and the fixed stabilizer 6. The outer wall of the fixed stabilizer 6 has equally spaced flow grooves A8, and the outer wall of the sliding stabilizer 3 has equally spaced flow grooves B10. The flow grooves A8 and B10 are offset. When the sliding stabilizer 3 and the fixed stabilizer 6 abut against each other, the flow groove A8 is blocked by the part of the sliding stabilizer 3 where the flow groove B10 is not formed, and the flow groove B10 is blocked by the part of the fixed stabilizer 6 where the flow groove A8 is not formed.

[0024] During the downstroke, the friction between the wall of the oil pipe 1 and the sliding stabilizer 3 is upward, and the direction of the oil flowing through the sliding stabilizer 3 is also upward. Under the combined action of the oil thrust and friction, the sliding stabilizer 3 is pushed upward and separated from the fixed stabilizer 6. The seal between the two is released, and the oil below can pass through the flow groove A8 and the flow groove B10 in sequence.

[0025] During the upstroke, the frictional force between the pipe wall of oil pipe 1 and the sliding stabilizer 3 is downward. In addition, the gravity of the oil passing through the sliding stabilizer 3 is also downward. Therefore, the sliding stabilizer 3 is pushed downward and comes into close contact with the fixed stabilizer 6. The seal between the two is re-established, and the flow grooves A8 and B10 are blocked. The oil above cannot pass through the flow grooves A8 and B10, but is lifted up by the two stabilizers. The load on the pump is greatly reduced, which plays a role in assisting pumping.

[0026] The outer wall of the columnar body 9 corresponding to the sliding stabilizer 3 is provided with an axial groove, referred to as a ball groove 903. The outer wall of the sliding stabilizer 3 is provided with a ball mounting hole 11, in which a ball 13 and a plug 12 are disposed. The plug 12 is fixedly connected to the ball mounting hole 11, encapsulating the ball 13 within the hole. The ball 13 slides within the ball groove 903, thus allowing the sliding stabilizer 3 to slide up and down relative to the columnar body 9, but not to rotate relative to it. Compared to the stroke distance of the sucker rod, the sliding stabilizer 3 has a smaller range of motion. Furthermore, the rolling contact between the sliding stabilizer 3 and the columnar body 9 via the ball 13 significantly reduces friction and minimizes damage to the columnar body 9.

[0027] The fixed stabilizer 6 and the columnar body 9 are connected by a key, preventing the fixed stabilizer 6 from rotating relative to the columnar body 9. The columnar body 9 has a limiting step, and the upper end of the fixed stabilizer 6 abuts against this limiting step, thus restricting the fixed stabilizer 6 from sliding upwards relative to the columnar body 9. A retaining ring 7 is fixedly installed on the columnar body 9 below the fixed stabilizer 6, and the lower end of the fixed stabilizer 6 rests against the retaining ring 7, thus preventing the fixed stabilizer 6 from sliding downwards relative to the columnar body 9. After the lower connector 902 is connected to the sucker rod, the lower end of the retaining ring 7 nearly abuts against the upper end of the sucker rod below, and the sucker rod below further limits the position of the retaining ring 7, which in turn limits the position of the fixed stabilizer 6.

[0028] As can be seen from the above, neither the sliding stabilizer 3 nor the fixed stabilizer 6 rotates relative to the columnar body 9, thus ensuring that the flow grooves A8 and B10 are always in their initial misaligned state. Therefore, when the sliding stabilizer 3 and the fixed stabilizer 6 are in close contact, they can always block the flow grooves A8 and B10. During the upstroke of the pumping unit, the two stabilizers can always play a stable pumping assist role.

[0029] The outer wall of the fixed stabilizer 6 is provided with an annular groove A5, which connects the flow groove A8; the outer wall of the sliding stabilizer 3 is also provided with an annular groove B2, which connects the flow groove B10. The annular grooves A5 and B2 serve to connect the oil and further serve to scrape the wax.

[0030] An elastic sealing gasket 4 is provided on the upper end face of the fixed stabilizer 6, and an elastic sealing gasket 4 is also provided on the lower end face of the sliding stabilizer 3. When the sliding stabilizer 3 and the fixed stabilizer 6 are in contact, the two elastic sealing gaskets 4 are tightly pressed against each other, and the elastic sealing gasket 4 has a better sealing effect on the flow groove A8 and the flow groove B10.

Claims

1. A rolling sucker rod centralizer, characterized in that: The column includes a columnar body (9), with an upper connector (901) at the upper end and a lower connector (902) at the lower end. A sliding stabilizer (3) is fitted on the upper part of the columnar body (9), and a fixed stabilizer (6) is fitted on the lower part of the columnar body (9). The sliding stabilizer (3) slides between the upper connector (901) and the fixed stabilizer (6). The outer wall of the fixed stabilizer (6) has equally spaced flow grooves A (8), and the outer wall of the sliding stabilizer (3) has equally spaced flow grooves B (10). The flow grooves A (8) and B (10) are misaligned. When the sliding stabilizer (3) and the fixed stabilizer (6) come into contact, the flow groove A (8) is blocked by the sliding stabilizer (3), and the flow groove B (10) is blocked by the fixed stabilizer (6).

2. The rolling sucker rod centralizer according to claim 1, characterized in that: The outer wall of the column (9) corresponding to the sliding stabilizer (3) is provided with an axial groove, which is called a ball groove (903). The outer wall of the sliding stabilizer (3) is provided with a ball mounting hole (11). A ball (13) and a plug (12) are provided in the ball mounting hole (11). The plug (12) is fixedly connected to the ball mounting hole (11). The plug (12) encapsulates the ball (13) in the ball mounting hole (11). The ball (13) slides in the ball groove (903), so that the sliding stabilizer (3) can only slide up and down relative to the column (9) and cannot rotate relative to the column (9).

3. The rolling sucker rod centralizer according to claim 1, characterized in that: The fixed support body (6) and the column (9) are connected by a key, so that the fixed support body (6) cannot rotate relative to the column (9); the column (9) has a limiting step, and the upper end of the fixed support body (6) abuts against the limiting step, thereby restricting the fixed support body (6) from sliding upward relative to the column (9); a retaining ring (7) is fixedly provided on the column (9) below the fixed support body (6), and the lower end of the fixed support body (6) abuts against the retaining ring (7), thereby restricting the fixed support body (6) from sliding downward relative to the column (9).

4. A rolling sucker rod centralizer according to claim 1, characterized in that: The outer wall of the fixed straightening body (6) is provided with an annular groove A (5), which connects the overflow groove A (8); the outer wall of the sliding straightening body (3) is also provided with an annular groove B (2), which connects the overflow groove B (10).

5. A rolling sucker rod centralizer according to claim 1, characterized in that: An elastic sealing pad (4) is provided on the upper end face of the fixed straightening body (6), and an elastic sealing pad (4) is also provided on the lower end face of the sliding straightening body (3). When the sliding straightening body (3) and the fixed straightening body (6) are against each other, the two elastic sealing pads (4) are tightly pressed against each other.

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