Efficient connecting structure of low-abrasion sucker rod and using method of efficient connecting structure

Abstract

The invention relates to the technical field of oilfield exploitation instruments, in particular to an efficient connecting structure of a low-abrasion sucker rod and a using method thereof.The efficient connecting structure of the low-abrasion sucker rod comprises a connector and a centralizer, the connector comprises a connecting rod and two threaded sleeves used for being connected with the sucker rod, and the connecting rod is provided with an upper end and a lower end; the two threaded sleeves are fixedly connected to the upper end and the lower end of the connecting rod respectively, and the centralizer can rotate on the connecting rod and translate along the central axis of the connecting rod; the centralizer comprises a cylindrical base body annularly arranged on the connecting rod in a sleeving mode and a plurality of contact parts fixedly connected to the outer side of the base body, and the ends, away from the base body, of the contact parts are provided with arc-shaped guide parts. The centralizer can adapt to the working condition of the tubing coupling position, an operator does not need to calculate the working position of a connecting structure, and the use efficiency is remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of oilfield mining equipment, and in particular to a high-efficiency connection structure of a low-wear sucker rod and a method of using the same. Background Art

[0002] During current oilfield exploitation operations, oil wells are mostly arranged as follower wells to improve oil production efficiency. Bending is more common in follower wells. In the prior art, a sucker rod connection structure with a centralizer is generally used to replace the original sucker rod coupling. The connection structure with the centralizer can reduce the contact between the sucker rod and the inner wall of the oil pipe, thereby reducing the wear of the sucker rod. In other words, the wear of the sucker rod is reduced by replacing the contact between the sucker rod and the inner wall of the oil pipe with the centralizer.

[0003] According to the current practice of lowering centralizers, generally about 20 centralizers are lowered for a well of 1500-2000m. When lowering the centralizer connector, its target working depth should be calculated to avoid the tubing coupling. This is because the tubing coupling may have the following characteristics: Figure 1 As shown in the step-like structure, the oil pipe is integrally formed and its interior has been bored before leaving the factory, and its inner wall is smooth and uniform. Although the inner wall of the oil pipe coupling is connected smoothly and evenly with the inner wall of the oil pipe after nominal connection, it is limited by tolerances, installation methods and downhole stress conditions, and it is common to have larger step-like structures. If the protrusion of the aforementioned larger step-like structure blocks the upward or downward movement of the centralizer, the protruding sharp edge of the step-like structure may cause damage to the centralizer, and long-term use will cause excessive wear of the centralizer, and then cause wear of the sucker rod.

[0004] Most of the centralizers in the prior art are as shown in the Chinese utility model patent with publication number CN216690998U, which has a spiral rifling-like structure. In actual use, the spiral rifling structure is in direct contact with the pipe wall. A small number of centralizers with other shapes and functions are as shown in publication numbers CN118029900B and CN209817964U, which have complex structures and high probability of damage.

[0005] Most of the existing centralizers are not suitable for use at tubing couplings for the following reasons: First, the centralizer forms a high pair when in contact with the pipe wall. The spiral contact part of the centralizer has a small contact area with the pipe wall, fewer contact positions, and the part in contact with the pipe wall is discontinuous. Under the pressure of the sucker rod, the deformation of the centralizer will cause the outer diameter of the spiral contact part of the centralizer to be inconsistent. Under the scratch of the sharp edge of the step of the oil pipe coupling, the undulating spiral contact part will be subjected to more severe wear than the centralizer with a consistent outer diameter. Second, the end of the centralizer first receives the impact of the sharp edge at the step of the tubing coupling, which will cause local lack of material in the centralizer. Prolonged use will lead to the splitting of the centralizer.

[0006] Based on the fact that the existing centralizers are not suitable for the working environment at the tubing coupling, when the centralizer is installed and lowered into the well, it is necessary to calculate its target working depth, resulting in a long additional working time before lowering the well and a low efficiency of lowering the well. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present application provides an efficient connection structure for a low-wear sucker rod and its usage method. By setting guiding pieces with a relatively large degree of freedom, and by setting a number of contact parts and arc-shaped guiding parts whose central axes are parallel to the connecting rod, the probability of irregular deformation of the centralizer is reduced, the probability of impact damage to the centralizer by the stepped structure is reduced, and the probability of damage to the centralizer due to scraping by the sharp edge when the centralizer passes through the stepped structure is reduced. The centralizer can adapt to the working conditions at the tubing coupling position, eliminating the need for operators to calculate the working position of the connection structure, and significantly improving the usage efficiency.

[0008] The above application objectives of the present application are achieved through the following technical solutions: An efficient connection structure for a low-wear sucker rod, comprising a connector and a centralizer. The connector includes a connecting rod and two threaded sleeves for connecting the sucker rod. The connecting rod has an upper end and a lower end, and the two threaded sleeves are respectively fixedly connected to the upper end and the lower end of the connecting rod. The centralizer can rotate on the connecting rod and translate along the central axis of the connecting rod; The centralizer includes a cylindrical base sleeved on the connecting rod and a number of contact parts fixedly connected to the outside of the base. The end of the contact part away from the base has an arc-shaped guiding part. The distances between the contact parts are equal. The central axes of the contact parts are parallel to the central axis of the base. There is a through groove between two adjacent contact parts. Both ends of the contact part are chamfered, and the chamfer extends to the arc-shaped guiding part; It further includes two circular guiding pieces. Both guiding pieces are sleeved on the connecting rod. The two guiding pieces are respectively located at both ends of the centralizer. The inner diameter of the guiding piece is larger than the outer diameter of the connecting rod. The outer diameter of the guiding piece is smaller than the diameter of the virtual circle where the end of the contact part away from the base is located. The difference between the outer diameter of the guiding piece and the diameter of the virtual circle is less than 1 mm.

[0009] Optionally, a number of elastically deformable pieces with adjustable shapes are fixedly connected to the inner side of the guiding piece. The elastically deformable pieces are distributed in an annular array. In the unfolded state of the elastically deformable pieces, the ends of the elastically deformable pieces away from the inner side of the guiding piece are all in contact with the connecting rod.

[0010] Optionally, one end of the base near the lower end of the connecting rod is provided with a plurality of first flow holes, which do not penetrate the middle of the base. A plurality of second flow holes communicating with the plurality of first flow holes are provided on the outer circle of the base. The communicating first flow holes and second flow holes form a channel for the oil fluid to flow through.

[0011] Optionally, the channels for the oil fluid to flow through formed by the plurality of first flow holes and second flow holes are respectively located between two adjacent contact parts.

[0012] Optionally, one end of the second flow hole near the upper end of the connecting rod is chamfered.

[0013] Optionally, one end of the base near the lower end of the connecting rod is provided with a groove, and the inner diameter of the groove gradually increases in the direction from the middle of the base to the lower end of the connecting rod. One end opening of the first flow hole near the lower end of the connecting rod is located on the inner end face of the groove.

[0014] Optionally, one end of the base near the upper end of the connecting rod is also provided with a groove, and the inner diameter of the groove of the base near the upper end of the connecting rod gradually increases in the direction from the middle of the base to the upper end of the connecting rod.

[0015] Optionally, the elastic piece on the guiding piece includes an inclined part, an arc-shaped bending part and a limiting part. The inclined part is fixedly connected to the guiding piece, and both ends of the arc-shaped bending part are respectively fixedly connected to the inclined part and the limiting part. When the guiding piece is in a state of being closely attached to the end of the base, the elastic piece is in a stretched state. The inclined part and the limiting part of the elastic piece are respectively attached to the side wall and the end of the groove. One end of the limiting part far from the arc-shaped bending part contacts the connecting rod. When the guiding piece at the lower end is in a state of being attached to the base, the elastic piece does not completely block the first flow hole.

[0016] The embodiment of the present application also provides a usage method of an efficient connection structure for a low-wear sucker rod. Using the efficient connection structure for a low-wear sucker rod as described in any one of the foregoing, the method includes the following steps: Lift the first sucker rod; Thread the lower threaded sleeve of the connector onto the top of the first sucker rod; Perform a downhole operation on the first sucker rod to make one end of the first sucker rod away from the connector enter the well; Lift the second sucker rod; Thread the bottom of the second sucker rod onto the upper threaded sleeve of the connector; Perform a downhole operation on the second sucker rod, wherein the target working position of the connector is not calculated.

[0017] In summary, the present application has the following beneficial technical effects: In the embodiment of the present application, by setting a guiding piece with a large degree of freedom, and a number of contact parts and arc-shaped guiding parts whose central axes are parallel to the connecting rod, the probability of irregular deformation of the centralizer is reduced, the probability of impact damage to the centralizer by the stepped structure is reduced, and the probability of damage to the centralizer due to scraping by sharp edges when the centralizer passes through the stepped structure is reduced. The centralizer can adapt to the working conditions at the position of the tubing collar, eliminating the need for operators to calculate the working position of the connection structure, and significantly improving the usage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the stepped structure of the tubing collar in the prior art; Figure 2 is an assembly schematic diagram of an embodiment of the present application; Figure 3 is a schematic diagram of a centralizer according to an embodiment of the present application; Figure 4 is a top view schematic diagram of a centralizer according to an embodiment of the present application; Figure 5 is a schematic diagram of the connection structure of the present application passing through the stepped structure; Figure 6 is a schematic diagram of the guiding piece warping up according to an embodiment of the present application; Figure 7 is a schematic diagram of the displacement of the guiding piece according to an embodiment of the present application; Figure 8 is a schematic diagram of the guiding piece resetting according to an embodiment of the present application; Figure 9 is a schematic diagram of the rotation of the centralizer according to an embodiment of the present application; Figure 10 is a schematic diagram of a spring piece added to the guiding piece according to an embodiment of the present application; Figure 11 is a schematic diagram of an oil passage according to an embodiment of the present application; Figure 12 is an assembly schematic diagram of the guiding piece spring piece according to an embodiment of the present application.

[0019] Reference numerals: 10, connector; 11, threaded sleeve; 12, connecting rod; 20, centralizer; 21, base body; 22, contact part; 23, arc-shaped guiding part; 24, through groove; 25, first flow hole; 26, second flow hole; 27, groove; 30, guiding piece; 31, spring piece; 32, inclined part; 33, arc-shaped bending part; 34, limiting part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present application will be further described in detail below with reference to the accompanying drawings.

[0021] The embodiment of the present application provides an efficient connection structure for a low-wear sucker rod, as Figure 2-4 shown, which includes a connector 10 and a centralizer 20. The centralizer 20 can be made of composite nylon materials such as polyamide composite materials, polytetrafluoroethylene composite materials, or ultra-high molecular weight polyethylene composite materials. The connector 10 includes a connecting rod 12 with an upper end and a lower end. Threaded sleeves 11 for connecting sucker rods are fixedly connected to both the upper end and the lower end of the connecting rod 12. There is a reduced-diameter portion at the connection between the threaded sleeve 11 and the connecting rod 12. The centralizer 20 is sleeved on the connecting rod 12, and the centralizer 20 can rotate by itself and can translate along the central axis of the connecting rod 12. One end of the threaded sleeve 11 close to the connecting rod 12 can limit the centralizer 20 to prevent the centralizer 20 from detaching from the connecting rod 12; The centralizer 20 includes a cylindrical base body 21 sleeved on the connecting rod 12 and a plurality of contact portions 22 fixedly connected to the outer side of the base body 21. In the assembled state, the inner side of the cylindrical base body 21 contacts the connecting rod 12, and the plurality of contact portions 22 protrude from the outer side surface of the base body 21. The length of the contact portions 22 is equal to the length of the base body 21. One end of the contact portion 22 away from the base body 21 has an arc-shaped guiding portion 23. The side surface on the side of the arc-shaped guiding portion 23 away from the base body 21 is an arc-shaped curved surface. The distances between the plurality of contact portions 22 are equal, that is, the plurality of contact portions 22 are distributed in a circular array. The central axes of the plurality of contact portions 22 are parallel to the central axis of the base body 21. Both ends of the contact portion 22 are chamfered, and the chamfer extends to the arc-shaped guiding portion 23. There is a through groove 24 between two adjacent contact portions 22, and both ends of the through groove 24 penetrate through both ends of the base body 21; It also includes two circular guiding pieces 30. Both of the two guiding pieces 30 are sleeved on the connecting rod 12. The two guiding pieces 30 are respectively located at both ends of the centralizer 20. The inner diameter of the guiding piece 30 is larger than the outer diameter of the connecting rod 12. The outer diameter of the guiding piece 30 is smaller than the diameter of the virtual circle where one end of the contact portion 22 away from the base body 21 is located. The difference between the outer diameter of the guiding piece 30 and the diameter of the virtual circle is less than 1 mm.

[0022] The following is a further introduction in combination with a specific usage scenario.

[0023] During use, the method of hoisting and lowering one by one can be used. The connection structure provided by the embodiment of the present application is used to connect two sucker rods into a whole and then lower them into the well.

[0024] Under the actual working condition, the arc-shaped guiding portion 23 of the contact portion 22 actually contacts the inner wall of the oil pipe. When the sucker rod is in the upstroke and downstroke, the arc-shaped guiding portion 23 slides relative to the inner wall of the oil pipe instead of the sucker rod to reduce the wear of the sucker rod.

[0025] The outer circle size of the guide piece 30 is approximately consistent with the size of the virtual circle where the end of the contact portion 22 away from the base 21 is located. When the connection structure reciprocates, the guide piece 30 always tends to be coaxial with the base 21 due to the oil film and condensed wax remaining on the pipe wall. When encountering a stepped structure of the oil pipe coupling, such as Figure 5 As shown, the sharp edge of the larger step-shaped protrusion structure will first touch the guide piece 30. Due to the chamfering of the contact portion 22 and the end of the arc-shaped guide portion 23, the guide piece 30 will be lifted up under the drive of the sucker rod and the action of the step-shaped protrusion structure, as shown in FIG. Figure 6 As shown in FIG. 1 , the end of the guide piece 30 close to the base 21 will gradually fit the chamfered surface of the contact portion 22 and the arc-shaped guide portion 23, thereby reducing the step-shaped sharp edge from scratching and cutting the centralizer 20. As the sucker rod continues to move, the guide piece 30 pressed by the step-shaped sharp edge will undergo the following Figure 7 The slight displacement shown in FIG. 1 can not only protect the centralizer 20, but also cause the sucker rod to deviate slightly. The subsequent centralizer 20 deviates from the scratch area of ​​the step-shaped sharp edge, reducing the wear of the centralizer 20 when passing through a larger step-shaped structure. After the end of the centralizer 20 passes through the step-shaped structure, as shown in FIG. Figure 8 As shown, the guide piece 30 is disengaged from the step-like structure and reset under the pushing of the end of the stabilizer 20. The guide piece 30 and the chamfered ends of the contact portion 22 and the arc-shaped guide portion 23 are arranged so that the wear of the stabilizer 20 passing through the step-like structure is significantly reduced, tending to normal wear of the stabilizer 20. The arrangement of the through groove 24 can improve the freedom of the guide piece 30 when it moves under pressure, so that it can better fit the movement of the stabilizer 20 and the step-like structure.

[0026] It should be understood that in the embodiment of the present application, the upper and lower ends of the centralizer 20 are both provided with guide pieces 30, so the above-mentioned purpose can be achieved when the sucker rod moves upward and downward and encounters the step-like structure. When the sucker rod moves upward and downward, it is affected by the liquid pressure, and the centralizer 20 is respectively at the bottom and top of the connecting rod 12. The end surface of the threaded sleeve 11 close to the connecting rod 12 will provide positive pressure for the centralizer 20 to maintain the relative position of the centralizer 20, so that the centralizer 20 can push the guide piece 30.

[0027] When the centralizer 20 is subjected to the pressure of the sucker rod while passing through the aforementioned step-like structure and other cross-sectional size changes, the centralizer 20 will temporarily not be completely in contact with the pipe wall. In the embodiment of the present application, the end of the contact portion 22 away from the base 21 has an arc-shaped guide portion 23, and the side surface of the arc-shaped guide portion 23 away from the base 21 is an arc-shaped curved surface. When the centralizer 20 is subjected to the pressure of the sucker rod while passing through the aforementioned step-like structure and other cross-sectional size changes, and only one contact portion 22 is subjected to force along the direction of the sucker rod pressure, this state is unstable. Figure 9As shown, the centralizer 20 will rotate adaptively so that two contact portions 22 in the direction of the pressure acting force along the sucker rod are in contact with the pipe wall of the pressure-receiving portion simultaneously. Compared with the discontinuous contact method in the prior art, in the embodiment of the present application, when contacting the pipe wall of the pressure-receiving portion, a number of higher pair connections can be formed, and each higher pair connection is continuous on the central axis of the oil pipe. On the basis of reducing wear in the through groove 24, the stress is also dispersed, reducing the probability of irregular deformation of the centralizer 20. As a result, the probability of the centralizer 20 being damaged by rubbing against the sharp edge when passing through the stepped structure is smaller. At the same time, compared with the method of driving the rotation of the centralizer 20 by the flow resistance of the oil fluid in the prior art, in the embodiment of the present application, the centralizer 20 is forced to rotate by the sucker rod pressure, enabling it to normally drive the centralizer 20 to rotate in an oil well with a relatively high content of impurities such as sediment, so that the centralizer 20 is evenly worn.

[0028] Generally speaking, in the embodiment of the present application, by setting the guiding piece 30 with a relatively large degree of freedom, and setting a number of contact portions 22 and arc-shaped guiding portions 23 whose central axes are parallel to the connecting rod 12, the probability of irregular deformation of the centralizer 20 is reduced, the probability of the stepped structure impacting and damaging the centralizer 20 is reduced, the probability of the centralizer 20 being damaged by rubbing against the sharp edge when passing through the stepped structure is reduced, enabling the centralizer 20 to adapt to the working conditions at the position of the oil pipe coupling. There is no need for the operator to calculate the working position of the connecting structure, significantly improving the usage efficiency.

[0029] It can be noted that in the embodiment of the present application, the outer circle dimension of the guiding piece 30 is approximately the same as the dimension of the virtual circle where the end of the contact portion 22 away from the base body 21 is located. When the connecting structure reciprocates, the edge of the guiding piece 30 can pre-treat the condensate on the pipe wall, thereby further reducing the probability of irregular deformation of the centralizer 20.

[0030] As a feasible specific implementation manner of the embodiment of the present application, a number of elastically deformable shrapnel 31 as shown in Figure 10 are fixedly connected to the inner side of the guiding piece 30. The a number of shrapnel 31 are distributed in a circular array. In the unfolded state of the shrapnel 31, the ends of the a number of shrapnel 31 away from the inner side of the guiding piece 30 are all in contact with the connecting rod 12. By setting the shrapnel 31, the relative position of the guiding piece 30 when not touched by the stepped structure can be better constrained, enabling it to effectively pre-treat the condensate on the pipe wall, reducing the probability of irregular deformation of the centralizer 20, and at the same time being able to receive the collision of the stepped structure with a good geometric relationship.

[0031] As a feasible specific implementation manner of the embodiment of the present application, as shown in Figure 11As shown, a plurality of first flow holes 25 are provided at one end of the base 21 near the lower end of the connecting rod 12, and the first flow holes 25 do not pass through the middle of the base 21. A plurality of second flow holes 26 are provided on the outer circle of the base 21, which are respectively connected to the plurality of first flow holes 25. The connected first flow holes 25 and second flow holes 26 form a channel for oil to flow. When the sucker rod moves downward, the centralizer 20 moves upward under the action of liquid resistance and pressure, so that the first flow holes 25 are exposed, so that oil can enter through the first flow holes 25 and the second flow holes 26. When the sucker rod moves upward, the centralizer 20 moves downward under the action of liquid resistance and pressure, so that the first flow holes 25 are blocked by one end of the threaded sleeve 11, and the oil on the centralizer 20 is taken away as the sucker rod moves upward, thereby playing a role in assisting pumping. Additional flow holes can be provided on the portion of the base 21 of the centralizer 20 near the upper end or on the guide plate 30 to improve the efficiency of assisting pumping.

[0032] On this basis, the channels for oil flow formed by the first flow holes 25 and the second flow holes 26 are respectively located between two adjacent contact parts 22 , staggering the contact parts 22 that are mainly subjected to force, so as to improve the structural strength of the centralizer 20 .

[0033] One end of the second flow hole 26 close to the upper end of the connecting rod 12 may be chamfered to reduce the upward flow resistance of the oil.

[0034] As a feasible specific implementation of the embodiment of the present application, a groove 27 is provided at one end of the base 21 close to the lower end of the connecting rod 12, and the inner diameter of the groove 27 gradually increases in the direction from the middle of the base 21 to the lower end of the connecting rod 12. The opening of the first flow hole 25 close to the lower end of the connecting rod 12 is located on the inner end surface of the groove 27. The setting of the groove 27 can facilitate the entry of oil. At the same time, the interior of the groove 27 also provides a deformation space for the base 21. In this way, when the oil pipe is bent sharply and passes through the stepped structure, the base 21 close to the end can slightly deform itself to make the external contact part 22 and the arc-shaped guide part 23 slightly move closer to the direction of the central axis of the base 21, so that the stabilizer 20 can better pass through the sharply bent oil pipe and the stepped structure. A groove 27 may also be provided at one end of the base 21 close to the upper end of the connecting rod 12. The inner diameter of the groove 27 of the base 21 close to the upper end of the connecting rod 12 gradually increases along the middle of the base 21 toward the upper end of the connecting rod 12, so that the centralizer 20 can better pass through the sharply curved oil pipe and stepped structure.

[0035] On this basis, if Figure 12As shown, the elastic piece 31 on the guiding piece 30 includes an inclined portion 32, an arc-shaped bending portion 33, and a limiting portion 34. The inclined portion 32 is fixedly connected to the guiding piece 30. The two ends of the arc-shaped bending portion 33 are respectively fixedly connected to the inclined portion 32 and the limiting portion 34. When the guiding piece 30 is in a state of closely adhering to the end of the base body 21, the elastic piece 31 is in a stretched state. The inclined portion 32 and the limiting portion 34 of the elastic piece 31 are respectively in contact with the side wall and the end of the groove 27. The end of the limiting portion 34 away from the arc-shaped bending portion 33 is in contact with the connecting rod 12. When the guiding piece 30 at the lower end is in a state of adhering to the base body 21, the elastic piece 31 does not completely block the first flow-through hole 25. In this way, during the operation of the sucker rod, the elastic piece 31 on the guiding piece 30 can extend into and adhere to the frustum-shaped groove 27, thereby guiding the basic position of the guiding piece 30, enabling its edge to pre-treat the condensate on the pipe wall, and further reducing the probability of irregular deformation of the centralizer 20.

[0036] The embodiment of the present application also provides a usage method of an efficient connection structure for a low-wear sucker rod. Using the efficient connection structure for a low-wear sucker rod as described above, it includes: Lift the first sucker rod; Thread the lower thread sleeve 11 of the connector 10 onto the top of the first sucker rod; Perform a downhole operation on the first sucker rod to make the end of the first sucker rod away from the connector 10 enter the well; Lift the second sucker rod; Thread the bottom of the second sucker rod onto the upper thread sleeve 11 of the connector 10; Perform a downhole operation on the second sucker rod, where the target working position of the connector 10 is not calculated.

[0037] Through the above steps, the connection of the sucker rod can be achieved, and there is no need to calculate the working position interval that the connection structure will reach, significantly improving the working efficiency of the sucker rod downhole.

[0038] The embodiments of this specific implementation manner are all preferred embodiments of the present application. Without restricting the protection scope of the present application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A high-efficiency connection structure of a low-wear sucker rod, characterized in that: The invention comprises a connector (10) and a centralizer (20), wherein the connector (10) comprises a connecting rod (12) and two threaded sleeves (11) for connecting a sucker rod, wherein the connecting rod (12) has an upper end and a lower end, and the two threaded sleeves (11) are respectively fixed to the upper end and the lower end of the connecting rod (12), and the centralizer (20) can rotate on the connecting rod (12) and translate along the central axis of the connecting rod (12), and is characterized in that: The centralizer (20) comprises a cylindrical base (21) sleeved on a connecting rod (12) and a plurality of contact portions (22) fixedly connected to the outside of the base (21); an end of the contact portion (22) away from the base (21) has an arc-shaped guide portion (23); the plurality of contact portions (22) are spaced equally apart; the central axes of the plurality of contact portions (22) are parallel to the central axis of the base (21); a through groove (24) is provided between two adjacent contact portions (22); and both ends of the contact portion (22) are chamfered, the chamfers extending to the arc-shaped guide portion (23); It also includes two circular guide pieces (30), the two guide pieces (30) are both sleeved on the connecting rod (12), the two guide pieces (30) are respectively located at two ends of the centralizer (20), the inner diameter of the guide piece (30) is larger than the outer diameter of the connecting rod (12), the outer diameter of the guide piece (30) is smaller than the diameter of the virtual circle where the end of the contact portion (22) away from the base (21) is located, and the difference between the outer diameter of the guide piece (30) and the diameter of the virtual circle is less than 1 mm.

2. The high-efficiency connection structure of a low-wear sucker rod according to claim 1, characterized in that: A plurality of elastic sheets (31) with adjustable shapes are fixedly connected to the inner side of the guide sheet (30), and the plurality of elastic sheets (31) are distributed in a ring array. When the elastic sheets (31) are in a stretched state, ends of the plurality of elastic sheets (31) away from the inner side of the guide sheet (30) are in contact with the connecting rod (12).

3. The high-efficiency connection structure of a low-wear sucker rod according to claim 2, characterized in that: A plurality of first flow holes (25) are formed at one end of the base body (21) close to the lower end of the connecting rod (12); the first flow holes (25) do not penetrate the middle of the base body (21); a plurality of second flow holes (26) are formed on the outer circle of the base body (21) and are respectively connected to the plurality of first flow holes (25); the connected first flow holes (25) and the second flow holes (26) form a channel for oil to flow.

4. The high-efficiency connection structure of a low-wear sucker rod according to claim 3, characterized in that: Channels formed by a plurality of first flow holes (25) and second flow holes (26) through which oil can flow are respectively located between two adjacent contact portions (22).

5. The high-efficiency connection structure of a low-wear sucker rod according to claim 3, characterized in that: One end of the second flow hole (26) close to the upper end of the connecting rod (12) is chamfered.

6. The high-efficiency connection structure of a low-wear sucker rod according to claim 3, characterized in that: A groove (27) is provided at one end of the base body (21) close to the lower end of the connecting rod (12), and the inner diameter of the groove (27) gradually increases in a direction from the middle of the base body (21) toward the lower end of the connecting rod (12). The opening of one end of the first flow hole (25) close to the lower end of the connecting rod (12) is located on the inner end surface of the groove (27).

7. The high-efficiency connection structure of a low-wear sucker rod according to claim 6, characterized in that: A groove (27) is also formed at one end of the base body (21) close to the upper end of the connecting rod (12). The inner diameter of the groove (27) of the base body (21) close to the upper end of the connecting rod (12) gradually increases in a direction from the middle of the base body (21) to the upper end of the connecting rod (12).

8. The high-efficiency connection structure of a low-wear sucker rod according to claim 7, characterized in that: The spring sheet (31) on the guide sheet (30) comprises an inclined portion (32), an arc-shaped bent portion (33) and a limiting portion (34); the inclined portion (32) is fixedly connected to the guide sheet (30); two ends of the arc-shaped bent portion (33) are respectively fixedly connected to the inclined portion (32) and the limiting portion (34); when the guide sheet (30) is in a state of being in close contact with the end of the base (21), the spring sheet (31) is in a stretched state; the inclined portion (32) and the limiting portion (34) of the spring sheet (31) are respectively in contact with the side wall and the end of the groove (27); one end of the limiting portion (34) away from the arc-shaped bent portion (33) is in contact with the connecting rod (12); when the guide sheet (30) at the lower end is in a state of being in contact with the base (21), the spring sheet (31) does not completely block the first flow hole (25).

9. A method for using a high-efficiency connection structure of a low-wear sucker rod, using the high-efficiency connection structure of a low-wear sucker rod according to any one of claims 1 to 8, comprising: Hoist the first sucker rod; The threaded sleeve (11) at the lower end of the connector (10) is threadedly connected to the top of the first sucker rod; Performing a downhole operation on the first sucker rod, so that the end of the first sucker rod away from the connector (10) enters the well; Hoist the second sucker rod; Threading the bottom of the second sucker rod to the upper threaded sleeve (11) of the connector (10); The second sucker rod is lowered into the well, wherein the target working position of the connector (10) is not calculated.

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