Energy-saving and environment-friendly sucker rod centralizer

Abstract

The utility model relates to an energy-saving and environment-friendly sucker rod centralizer, belonging to the technical field of oil and gas production equipment, including core stem and centralizer body, the centralizer body can be twisted at least one week under the action of torsional spring A relative to the core stem, the convex part of centralizer body sets up installation hole, and installation hole installs outer slide sleeve, limiting mechanism and wear block from inside to outside in proper order, and the plug -in block is slidably inserted in the outer slide sleeve, and the unlocking ring extends to between the centralizer body and the core stem, and the unlocking ring sets up notch, and the end of plug -in block has the inclined plane, and the notch pushes the inclined plane of plug -in block when the unlocking ring rotates and forces the plug -in block to slide, and the core stem sets up only one phase angle insertion hole for each centralizer body, and the phase angle of insertion hole on the core stem is evenly distributed, and the unlocking ring is fixedly connected through the short rod, and the short rod is located in the concave part of centralizer body. Only one phase angle convex part of the utility model is worn out, and only one convex part unit is rotated, and the whole service life is only rotated one week, and the transverse friction of centralizer body and oil pipe and the wear and tear of centralizer body to the core stem are small to negligible.

Description

Technical Field

[0001] This invention belongs to the technical field of oil and gas production equipment, and particularly relates to an energy-saving and environmentally friendly sucker rod centralizer. Background Technology

[0002] In the mid-to-late stages of oilfield development, oil and gas production engineering faces an increasing number of unresolved challenges. The pumping unit is a crucial piece of oil and gas production equipment, and the sucker rod is one of the core components of the pumping unit well. Therefore, the sucker rod is a vital core component of oil and gas production equipment. The sucker rod is connected to a rod string via couplings, with the upper end connected to the pumping unit or screw pump motor and the lower end connected to the pump plunger, primarily responsible for power transmission. The sucker rod moves up and down inside the tubing, pumping oil through reciprocating motion. To prevent uneven wear between the sucker rod and tubing, a sucker rod centralizer is typically installed on the sucker rod to transfer the wear from the sucker rod to the tubing.

[0003] To avoid excessive wear on one side of the outer wall of the sucker rod centralizer, existing technologies have developed rotatable sucker rod centralizers. This means that as the sucker rod moves up and down, the centralizer rotates relative to the sucker rod, ensuring that the outer wall of the centralizer rubs evenly against the tubing in the circumferential direction, thus avoiding uneven wear on the outer wall of the centralizer.

[0004] In existing sucker rod centralizers, the centralizer rotates relative to the sucker rod during the up and down strokes. During this rotation, the outer wall of the centralizer experiences not only vertical friction but also circumferential (lateral) friction against the inner wall of the tubing. This circumferential friction consumes the centralizer without any beneficial effect, accelerating its wear. Furthermore, the inner wall of the centralizer constantly experiences circumferential friction against the outer wall of the sucker rod or mandrel during rotation. This circumferential friction can easily lead to mandrel breakage due to wear. Summary of the Invention

[0005] To address the issue of continuous rotation of the sucker rod centralizer relative to the mandrel, this invention provides an energy-saving and environmentally friendly sucker rod centralizer. This invention only generates rotation of a single protruding unit after one side of the centralizer has worn away completely. After rotating one unit, an adjacent protrusion rubs against the tubing. Once that protrusion is also worn away, another unit of rotation occurs, and so on, until all protrusions of the centralizer are worn away. Throughout its entire service life, the centralizer rotates only once relative to the sucker rod. Therefore, lateral wear between the centralizer's outer wall and the tubing's inner wall is minimal, as is wear on the mandrel from the centralizer's inner wall.

[0006] The technical solution provided by this invention is: an energy-saving and environmentally friendly sucker rod centralizer, comprising a core rod, the upper and lower ends of which are respectively connected to a sucker rod coupling, thereby connecting the core rod to the sucker rod post. A centralizer body is slidably fitted on the core rod, and a torsion spring A is provided between the centralizer body and the core rod. Under the action of the torsion spring A, the centralizer body can rotate at least one revolution relative to the core rod. The outer wall of the centralizer body includes a protrusion and a concave portion. Each protrusion has a stepped mounting hole in the radial direction of the centralizer body. Each mounting hole has an outer sliding sleeve, a limiting mechanism, and a wear-resistant block installed sequentially from the inside to the outside. The outer sliding sleeve can slide relative to the mounting hole. A spring A is provided between the mounting hole and the outer sliding sleeve. Under the elastic force of the spring A, the outer sliding sleeve has a tendency to move away from the core rod. The wear-resistant block is fixedly connected to the mounting hole. The limiting mechanism is located between the wear-resistant block and the outer sliding sleeve. Under the restriction of the limiting mechanism, the outer sliding sleeve cannot slide towards the wear-resistant block. An insert block is slidably inserted into the outer sleeve. A spring B is provided between the outer sleeve and the insert block. Under the elastic force of spring B, the insert block tends to move against the core rod. An unlocking ring is slidably fitted on the core rod between two adjacent straightening bodies. The unlocking ring extends between the straightening body and the core rod. A notch is opened on the unlocking ring corresponding to the position of the insert block. The insert block can pass through the notch and abut against the core rod. The end of the insert block on the opposite side of the torsion direction of the torsion spring A has a bevel. When the unlocking ring rotates, the notch pushes the bevel of the insert block, forcing the insert block to slide away from the core rod. The core rod has only one phase angle insertion hole for each straightening body. The phase angles of the insertion holes on the core rod are evenly distributed. A short rod is provided between the upper and lower adjacent unlocking rings. The short rod is located in the concave part of the straightening body. The upper and lower ends of the short rod are fixedly connected to two adjacent unlocking rings respectively. Under the connection of the short rod, all unlocking rings can rotate synchronously.

[0007] A further technical solution is as follows: the inner side of the middle part of the straightening body has a concave ring A, and the torsion spring A is disposed in the concave ring A. When viewed from above, the torsion force generated by the torsion spring A causes the straightening body to rotate counterclockwise relative to the core rod; the inner side of the middle part of the unlocking ring has a concave ring B, and the concave ring B is disposed in the concave ring B. Under the action of the torsion force of the torsion spring B, the unlocking ring has a tendency to rotate relative to the core rod. When viewed from above, the torsion force generated by the torsion spring B causes the unlocking ring to rotate instantaneously relative to the core rod.

[0008] A further technical solution is as follows: the limiting mechanism includes a pressure block and a rotating rod. The pressure block is pressed between the wear-resistant block and the mounting hole. One end of the rotating rod abuts against the outer sliding sleeve, and the other end rests against the pressure block. When the wear-resistant block is worn out, the pressure block loses its restraint and moves. Then, one end of the rotating rod loses its restraint and the rotating rod rotates, so that the outer sliding sleeve can slide outward in the mounting hole.

[0009] A further technical solution is: the upper part of the core rod is fixedly fitted with an upper plug, the lower part is fixedly fitted with a lower plug, and all the straightening bodies are located between the upper plug and the lower plug.

[0010] A further technical solution is: the outer wall of the straightener adjacent to the upper plug is a conical surface, and the outer wall of the straightener adjacent to the lower plug is a conical surface.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. In existing sucker rod centralizers, the centralizer rotates relative to the sucker rod during the up and down strokes. During this rotation, the outer wall of the centralizer experiences not only vertical friction but also circumferential (lateral) friction against the inner wall of the tubing. This circumferential friction wears down the centralizer without any beneficial effect, accelerating its wear. Furthermore, the inner wall of the centralizer constantly experiences circumferential friction against the outer wall of the sucker rod or mandrel during rotation, which can easily lead to mandrel breakage. In this application, however, because the insert block on one side of the centralizer is inserted into the mandrel's insertion hole, the centralizer cannot rotate relative to the sucker rod during the up and down strokes. In this case, only one of the centralizer's protruding units experiences uneven wear. Only when the convex unit and the wear-resistant block are completely worn out can the limiting mechanism on the convex part lose its restraint on the outer sliding sleeve. Under the action of spring A, the outer sliding sleeve will slide outward from the mounting hole, thereby driving the insert block to slide and pull it out of the insertion hole. At this time, the centralizer rotates one convex unit relative to the core rod under the action of torsion spring A. The convex unit with severe wear turns away, and the next convex unit takes over the uneven wear. At this time, the insert block on the convex unit bearing the uneven wear inserts into the insertion hole of the core rod, and the entire centralizer returns to the state where it cannot rotate relative to the core rod. This process continues until all the convex units on all phases are completely worn out, and the service life of the centralizer ends. It can be seen that during the entire service life of the centralizer of this application, the centralizer only rotates one revolution relative to the core rod. The lateral friction between the outer wall of the centralizer and the inner wall of the oil pipe is negligible, and the wear on the core rod caused by the rotation of the inner wall of the centralizer is also negligible.

[0013] 2. Since all the protrusions of the centralizing body in this application will be used up throughout its entire service life, the utilization rate of the centralizing body is extremely high, effectively extending the pump inspection cycle and improving oil production efficiency, thus making it more energy-efficient and effective. Because this application effectively extends the pump inspection cycle, the number of pump inspections is reduced, and the number of times oil spills from the wellhead during pump inspections is reduced, thus achieving a certain environmental protection effect.

[0014] 3. This application has multiple centering bodies arranged along the core rod. Each centering body has only one phase angle plug inserted into the socket. The plugs inserted into the sockets on each centering body are at different phase angles. Therefore, this application can be used normally no matter what phase the wear occurs at. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 yes Figure 1 A magnified view of a section at point I.

[0017] Figure 3 yes Figure 1 Cross-sectional view at point AA.

[0018] Figure 4 yes Figure 1 Cross-sectional view at point BB.

[0019] Figure 5 yes Figure 1 Cross-sectional view at point C.

[0020] Figure 6 yes Figure 1 Cross-sectional view at point DD.

[0021] Figure 7 This is a planar unfolded view of the unlocking ring in this invention.

[0022] Figure 8 yes Figure 7 A view of the direction of E in the middle.

[0023] Figure 9 This is a schematic diagram showing the convex portion of the first phase of the first centralizer being worn away.

[0024] Figure 10 This is a schematic diagram of the first upright body after rotating one convex unit.

[0025] Figure 11 This is a schematic diagram of the first straightening body after rotating two convex units.

[0026] Figure 12 This is a schematic diagram of the first uprighting body after rotating the three convex units.

[0027] In the diagram: 1. Upper plug; 2. Straightening body; 3. Unlocking ring; 4. Concave ring A; 5. Concave ring B; 6. Core rod; 7. Lower plug; 8. Wear-resistant block; 9. Rotating rod; 10. Outer sliding sleeve; 11. Insert block; 12. Spring A; 13. Spring B; 14. Short rod; 15. Notch; 16. Insertion hole; 17. Pressure block; 18. Mounting hole. Detailed Implementation

[0028] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention 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 invention and are not intended to limit the present invention.

[0029] This embodiment includes a core rod 6, the upper and lower ends of which are connected to the sucker rod coupling, thereby connecting the core rod 6 in series with the sucker rod string. An upper plug 1 is fixedly fitted onto the upper part of the core rod 6, and a lower plug 7 is fixedly fitted onto the lower part. Multiple stabilizers 2 are slidably fitted onto the core rod 6 between the upper plug 1 and the lower plug 7. This embodiment shows four stabilizers 2, but the number of stabilizers 2 is not limited to four. The outer wall of the stabilizer 2 adjacent to the upper plug 1 is a conical surface, and the outer wall of the stabilizer 2 adjacent to the lower plug 7 is also a conical surface.

[0030] Each straightening body 2 has a concave ring A4 on the inner side of its middle part. A strong torsion spring A is installed inside the concave ring A4. The torsion spring A is located between the straightening body 2 and the core rod 6. Under the action of the torsion spring A, the straightening body 2 can rotate at least one revolution relative to the core rod 6.

[0031] The outer wall of the straightening body 2 includes a protrusion and a concave part. Each protrusion is provided with a radial stepped mounting hole 18 of the straightening body 2. Each mounting hole 18 is provided with an outer sliding sleeve 10, a limiting mechanism and a wear-resistant block 8 in sequence from the inside to the outside. The outer sliding sleeve 10 can slide relative to the mounting hole 18. A spring A12 is provided between the mounting hole 18 and the outer sliding sleeve 10. Under the elastic force of the spring A12, the outer sliding sleeve 10 has a tendency to move away from the core rod 6. The wear-resistant block 8 is fixedly connected to the mounting hole 18. The limiting mechanism is located between the wear-resistant block 8 and the outer sliding sleeve 10. Under the restriction of the limiting mechanism, the outer sliding sleeve 10 cannot slide towards the wear-resistant block 8.

[0032] In this embodiment, as Figure 3 and Figure 9 As shown, the limiting mechanism includes a pressure block 17 and a rotating rod 9. The pressure block 17 is pressed between the wear-resistant block 8 and the mounting hole 18. One end of the rotating rod 9 abuts against the outer sliding sleeve 10, and the other end rests against the pressure block 17. When the wear-resistant block 8 is worn out, the pressure block 17 is freed from restraint and can move. Subsequently, one end of the rotating rod 9 is freed from restraint, and the rotating rod 9 can rotate. Thus, the outer sliding sleeve 10 can slide outward in the mounting hole 18 under the action of the spring A12.

[0033] An insert block 11 is slidably inserted into the outer sliding sleeve 10. A spring B13 is provided between the outer sliding sleeve 10 and the insert block 11. Under the elastic force of the spring B13, the insert block 11 has a tendency to move against the core rod 6.

[0034] An unlocking ring 3 is slidably fitted onto the core rod 6 between two adjacent straightening bodies 2. The unlocking ring 3 extends between the straightening body 2 and the core rod 6. A notch 15 is provided on the unlocking ring 3 corresponding to the position of the insert 11. The insert 11 can pass through the notch 15 and abut against the core rod 6. The end of the insert 11 on the opposite side of the torsion direction of the torsion spring A has a bevel. Thus, when the unlocking ring 3 rotates, the notch 15 pushes the bevel of the insert 11, forcing the insert 11 to slide away from the core rod 6. Figure 3-6 As shown, the core rod 6 has only one insertion hole 16 for each straightener 2, and the phase angles of the insertion holes 16 on the core rod 6 are evenly distributed. Since only one insertion block 11 of each straightener 2 is inserted into the insertion hole 16, in the original state, none of the straighteners 2 can rotate relative to the core rod 6. Figure 3-6 As can be seen, the insertion holes 16 on the core rod 6 are evenly distributed circumferentially. The insert blocks 11 inserted into the insertion holes 16 on each centralizer 2 are at different phase angles. Therefore, regardless of the phase in which the wear occurs, one centralizer 2 will play an active rotational role, while the other three centralizers 2 will play a follower rotational role. Which centralizer 2 plays the main rotational role depends on the phase in which the wear occurs.

[0035] A short rod 14 is provided between adjacent unlocking rings 3. The short rod 14 is located in the recess of the straightening body 2. The upper and lower ends of the short rod 14 are fixedly connected to two adjacent unlocking rings 3 respectively. Under the connection of the short rod 14, all unlocking rings 3 can rotate synchronously.

[0036] Viewed from above by the centering body 2, the torque generated by the torsion spring A causes the centering body 2 to rotate counterclockwise relative to the core rod 6. The unlocking ring 3 has a concave ring B5 on its inner side, within which a torsion spring B is installed. Under the torque of the torsion spring B, the unlocking ring 3 tends to rotate relative to the core rod 6. Viewed from above by the centering body 2, the torque generated by the torsion spring B causes the unlocking ring 3 to rotate instantaneously relative to the core rod 6. The torque of the torsion spring A is much greater than that of the torsion spring B; therefore, when the centering body 2 rotates under torque, it will cause the unlocking ring 3 to rotate. When the centering body 2 stops rotating, under the action of the torsion spring B, the short rod 14 rests against one side of the concave portion of the centering body 2. The next rotation of the centering body 2 will immediately push the short rod 14 and the entire unlocking ring 3 to rotate.

[0037] To clearly describe the working process of this invention, four phases are first defined. Figure 3-6In the diagram, the left side represents the first phase, the bottom side represents the second phase, the right side represents the third phase, and the top side represents the fourth phase. In this embodiment, there are four straighteners 2. Each straightener 2 has only one protrusion with an insert 11 that can be inserted into a socket 16 (the insertion of the insert 11 into the socket 16 ensures that the straightener 2 rotates relative to the core rod 6). The other three protrusions have inserts 11 that rest against the core rod 6. In this embodiment, the four straighteners 2 correspond to four sockets 16 on the core rod 6. The phase angles of the four sockets 16 are evenly distributed: the socket 16 corresponding to the first straightener 2 is in the first phase, the socket 16 corresponding to the second straightener 2 is in the second phase, the socket 16 corresponding to the third straightener 2 is in the third phase, and the socket 16 corresponding to the fourth straightener 2 is in the fourth phase.

[0038] 1. Assume that the wear between the four centralizers 2 and the oil pipe occurs in the first phase ( Figure 3-6 (Left side of the middle diagram) Then, the protrusions of the four straightening bodies 2 on the first phase will be completely worn away, that is, the four wear-resistant blocks 8 on the first phase will be completely worn away. After the pressure block 17 is freed from the restraint of the wear-resistant blocks 8, it can move freely, thereby allowing the rotating rod 9 to rotate. At this time, under the elastic force of the spring A12, the sliding sleeve slides the insert block 11 outward of the mounting hole 18. For the first straightening body 2, the insert block 11 is pulled out of the insertion hole 16. The first straightening body 2 rotates counterclockwise under the action of the torsion spring A. For the other three straightening bodies 2, since the insert block 11 is not inserted into the insertion hole 16 on the first phase, only the insert block 11 on the first phase slides. At this time, the second, third, and fourth straightening bodies 2 cannot rotate relative to the core rod 6. However, since the short rod 14 is located in the concave part of the straightening body 2, such as Figure 3-6 As shown, the short rod 14 rests against one side of the concave part of the straightening body 2. The counterclockwise rotation of the first straightening body 2 will drive the short rod 14 to rotate, which in turn will drive all the unlocking rings 3 to rotate. Because the rotation of the unlocking rings 3 will push the inclined part of the plug 11, forcing all the plugs 11 to slide, the plugs 11 of the second straightening body 2, the third straightening body 2 and the fourth straightening body 2 will be pulled out of the socket 16. Therefore, under the action of their respective torsion springs A, the second straightening body 2, the third straightening body 2 and the fourth straightening body 2 also rotate counterclockwise. Therefore, when the wear occurs in the first phase, the first straightening body 2 plays the role of active rotation, and the second straightening body 2, the third straightening body 2 and the fourth straightening body 2 play the role of passive rotation. All four straightening bodies 2 can only rotate 90 degrees counterclockwise, because after rotating 90 degrees, each straightening body 2 will have a plug 11 inserted into the socket 16. All the protrusions on the first phase after rotation are complete and can be used for further wear. Figure 9 This is a schematic diagram showing that the protrusion of the first phase of the first centralizer 2 has been completely worn away. Figure 10 This is a schematic diagram showing the first straightening body 2 after rotating one convex unit. Figure 11 This is a schematic diagram showing the first straightening body 2 after rotating two protruding units. Figure 12 This is a schematic diagram of the first straightening body 2 after rotating the three convex units.

[0039] 2. Assume that the wear between the four centralizers 2 and the oil pipe occurs in the second phase ( Figure 3-6 (Lower side of the middle diagram) Then, the protrusions of the four straightening bodies 2 on the second phase will be completely worn away, that is, the four wear-resistant blocks 8 on the second phase will be completely worn away. After the pressure block 17 is freed from the restraint of the wear-resistant blocks 8, it can move freely, thereby allowing the rotating rod 9 to rotate. At this time, under the elastic force of the spring A12, the sliding sleeve slides the insert block 11 outward of the mounting hole 18. For the second straightening body 2, the insert block 11 is pulled out of the insertion hole 16. The second straightening body 2 rotates counterclockwise under the action of the torsion spring A. For the other three straightening bodies 2, since the insert block 11 on the second phase is not inserted into the insertion hole 16, only the insert block 11 on the second phase slides. At this time, the first, third, and fourth straightening bodies 2 cannot rotate relative to the core rod 6. However, since the short rod 14 is located in the concave part of the straightening body 2, such as Figure 3-6 As shown, the short rod 14 rests against one side of the concave part of the straightening body 2. The counterclockwise rotation of the second straightening body 2 will drive the short rod 14 to rotate, which in turn will drive all the unlocking rings 3 to rotate. Because the rotation of the unlocking rings 3 will push the inclined part of the plug 11, forcing all the plugs 11 to slide, the plugs 11 of the first straightening body 2, the third straightening body 2 and the fourth straightening body 2 will be pulled out of the socket 16. Therefore, under the action of their respective torsion springs A, the first straightening body 2, the third straightening body 2 and the fourth straightening body 2 also rotate counterclockwise. Therefore, when the wear occurs in the second phase, the second straightening body 2 plays the role of active rotation, and the first straightening body 2, the third straightening body 2 and the fourth straightening body 2 play the role of passive rotation. All four straightening bodies 2 can only rotate 90 degrees counterclockwise, because after rotating 90 degrees, each straightening body 2 will have a plug 11 inserted into the socket 16. All the protrusions on the second phase after rotation are complete and can be used for further eccentric grinding.

[0040] 3. Assume that the uneven wear between the four centralizers 2 and the oil pipe occurs in the third phase ( Figure 3-6(On the right side of the middle diagram), then the protrusions of the four straightening bodies 2 on the third phase will be completely worn away, that is, the four wear-resistant blocks 8 on the third phase will be completely worn away. After the pressure block 17 is freed from the restraint of the wear-resistant blocks 8, it can move freely, thus allowing the rotating rod 9 to rotate. At this time, under the elastic force of the spring A12, the sliding sleeve slides the insert block 11 outward of the mounting hole 18. For the third straightening body 2, the insert block 11 is pulled out of the insertion hole 16. The third straightening body 2 rotates counterclockwise under the action of the torsion spring A. For the other three straightening bodies 2, since the insert block 11 on the third phase is not inserted into the insertion hole 16, only the insert block 11 on the third phase slides. At this time, the first, second, and fourth straightening bodies 2 cannot rotate relative to the core rod 6. However, since the short rod 14 is located in the concave part of the straightening body 2, such as Figure 3-6 As shown, the short rod 14 rests against one side of the concave part of the straightening body 2. The counterclockwise rotation of the third straightening body 2 will drive the short rod 14 to rotate, which in turn will drive all the unlocking rings 3 to rotate. Because the rotation of the unlocking rings 3 will push the inclined part of the plug 11, forcing all the plugs 11 to slide, the plugs 11 of the first straightening body 2, the second straightening body 2 and the fourth straightening body 2 will be pulled out of the socket 16. Therefore, under the action of their respective torsion springs A, the first straightening body 2, the second straightening body 2 and the fourth straightening body 2 also rotate counterclockwise. Therefore, when the wear occurs in the third phase, the third straightening body 2 plays the role of active rotation, and the first straightening body 2, the second straightening body 2 and the fourth straightening body 2 play the role of passive rotation. All four straightening bodies 2 can only rotate 90 degrees counterclockwise, because after rotating 90 degrees, each straightening body 2 will have a plug 11 inserted into the socket 16. All the protrusions on the third phase after rotation are complete and can be used for further grinding.

[0041] 4. Assume that the uneven wear between the four centralizers 2 and the oil pipe occurs in the fourth phase ( Figure 3-6 (On the right side of the middle diagram), then the protrusions of the four straightening bodies 2 on the fourth phase will be completely worn away, that is, the four wear-resistant blocks 8 on the fourth phase will be completely worn away. After the pressure block 17 is freed from the restraint of the wear-resistant blocks 8, it can move freely, thereby allowing the rotating rod 9 to rotate. At this time, under the elastic force of the spring A12, the sliding sleeve slides the insert block 11 outward of the mounting hole 18. For the fourth straightening body 2, the insert block 11 is pulled out of the insertion hole 16. The fourth straightening body 2 rotates counterclockwise under the action of the torsion spring A. For the other three straightening bodies 2, since the insert block 11 on the fourth phase is not inserted into the insertion hole 16, only the insert block 11 on the fourth phase slides. At this time, the first, second, and third straightening bodies 2 cannot rotate relative to the core rod 6. However, since the short rod 14 is located in the concave part of the straightening body 2, such as Figure 3-6As shown, the short rod 14 rests against one side of the concave part of the straightening body 2. The counterclockwise rotation of the fourth straightening body 2 will drive the short rod 14 to rotate, which in turn will drive all the unlocking rings 3 to rotate. Because the rotation of the unlocking rings 3 will push the inclined part of the plug 11, forcing all the plugs 11 to slide, the plugs 11 of the first straightening body 2, the second straightening body 2 and the third straightening body 2 will be pulled out of the socket 16. Therefore, under the action of their respective torsion springs A, the first straightening body 2, the second straightening body 2 and the third straightening body 2 also rotate counterclockwise. Therefore, when the wear occurs in the fourth phase, the fourth straightening body 2 plays the role of active rotation, and the first straightening body 2, the second straightening body 2 and the third straightening body 2 play the role of passive rotation. All four straightening bodies 2 can only rotate 90 degrees counterclockwise, because after rotating 90 degrees, each straightening body 2 will have a plug 11 inserted into the socket 16. All the protrusions on the fourth phase after rotation are complete and can be used for further grinding.

[0042] As can be seen from the above working process, in this application, only when the protrusion of one phase angle is worn out will the entire protrusion unit rotate, and it will not continuously rotate relative to the sucker rod. Throughout the entire service life of the centralizer 2, the centralizer 2 only rotates once relative to the core rod 6. The lateral friction between the outer wall of the centralizer 2 and the inner wall of the tubing is negligible, and the wear on the core rod 6 caused by the rotation of the inner wall of the centralizer 2 is also negligible. All protrusions of the centralizer 2 will be worn out throughout its entire service life, resulting in extremely high utilization of the centralizer 2. This effectively extends the pump inspection cycle, improves oil production efficiency, and is therefore more energy-efficient and effective. Since pump inspections or replacement of the sucker rod inevitably leave oil stains at the wellhead, the extremely high utilization rate of this application extends the pump inspection or replacement cycle, thus reducing the frequency of wellhead contamination and making it more environmentally friendly.

Claims

1. An energy-saving and environmentally friendly sucker rod centralizer, characterized in that: The system includes a core rod (6), on which a straightener (2) is slidably mounted. A torsion spring A is provided between each straightener (2) and the core rod (6). Under the action of the torsion spring A, the straightener (2) can rotate at least one revolution relative to the core rod (6). The outer wall of the straightener (2) includes a protrusion and a concave part. Each protrusion is provided with a radially stepped mounting hole (18) for the straightener (2). Each mounting hole (18) is provided with an outer sliding sleeve (10), a limiting mechanism, and a wear-resistant block (8) in sequence from the inside to the outside. The outer sliding sleeve (10) can slide relative to the mounting hole (18). Between the mounting hole (18) and the outer sliding sleeve (10) A spring A (12) is provided. Under the elastic force of the spring A (12), the outer sliding sleeve (10) tends to move away from the core rod (6). The wear-resistant block (8) is fixedly connected to the mounting hole (18). The limiting mechanism is located between the wear-resistant block (8) and the outer sliding sleeve (10). Under the restriction of the limiting mechanism, the outer sliding sleeve (10) cannot slide towards the wear-resistant block (8). A plug (11) is slidably inserted into the outer sliding sleeve (10). A spring B (13) is provided between the outer sliding sleeve (10) and the plug (11). Under the elastic force of the spring B (13), the plug (11) tends to move against the core rod (6). Unlocking rings (3) are slidably fitted on the core rod (6) between two adjacent straightening bodies (2). The unlocking rings (3) extend between the straightening body (2) and the core rod (6). A notch (15) is opened on the unlocking ring (3) corresponding to the position of the insert (11). The insert (11) can pass through the notch (15). The end of the insert (11) on the opposite side of the torsion direction of the torsion spring A has a bevel. When the unlocking ring (3) rotates, the notch (15) will push the bevel of the insert (11) to force the insert (11) to slide away from the core rod (6). The core rod (6) has only one phase angle insertion hole (16) for each straightening body (2). The phase angles of the insertion holes (16) on the core rod (6) are evenly distributed. A short rod (14) is set between the upper and lower adjacent unlocking rings (3). The short rod (14) is located in the concave part of the straightening body (2). The upper and lower ends of the short rod (14) are fixedly connected to the two adjacent unlocking rings (3) respectively. The limiting mechanism includes a pressure block (17) and a rotating rod (9). The pressure block (17) is pressed between the wear-resistant block (8) and the mounting hole (18). One end of the rotating rod (9) abuts against the outer sliding sleeve (10), and the other end rests against the pressure block (17). When the wear-resistant block (8) is worn out, the pressure block (17) is freed from restraint and moves. Then, one end of the rotating rod (9) is freed from restraint and the rotating rod (9) rotates, so that the outer sliding sleeve (10) slides outward in the mounting hole (18).

2. The energy-saving and environmentally friendly sucker rod centralizer according to claim 1, characterized in that: The centering body (2) has a concave ring A (4) on its inner side. The torsion spring A is set inside the concave ring A (4). When viewed from above, the torsion spring A generates a torque that causes the centering body (2) to rotate counterclockwise relative to the core rod (6). The unlocking ring (3) has a concave ring B (5) on its inner side. The torsion spring B is set inside the concave ring B (5). Under the action of the torsion spring B, the unlocking ring (3) has a tendency to rotate relative to the core rod (6). When viewed from above, the torsion spring B generates a torque that causes the unlocking ring (3) to rotate instantaneously relative to the core rod (6). The torque of the torsion spring A is greater than that of the torsion spring B.

3. The energy-saving and environmentally friendly sucker rod centralizer according to claim 1, characterized in that: The upper part of the core rod (6) is fixedly fitted with an upper plug (1), and the lower part is fixedly fitted with a lower plug (7). All the straightening bodies (2) are located between the upper plug (1) and the lower plug (7).

4. The energy-saving and environmentally friendly sucker rod centralizer according to claim 3, characterized in that: The outer wall of the straightening body (2) adjacent to the upper plug (1) is a cone surface, and the outer wall of the straightening body (2) adjacent to the lower plug (7) is a cone surface.

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