Energy-saving and environment-friendly sucker rod centralizer

Abstract

An energy-saving and environment-friendly sucker rod centralizer belongs to the technical field of oil and gas production equipment and comprises a core rod and a centralizing body, the centralizing body can be twisted for at least one circle relative to the core rod under the action of a torsion spring A, a mounting hole is formed in a convex part of the centralizing body, an outer sliding sleeve, a limiting mechanism and a wear-resistant block are sequentially mounted in the mounting hole from inside to outside, and an insertion block is slidably inserted in the outer sliding sleeve. The unlocking ring extends between the centralizing bodies and the core rod, a notch is formed in the unlocking ring, an inclined surface is arranged at the end part of the inserting block, when the unlocking ring rotates, the notch pushes the inclined surface of the inserting block to force the inserting block to slide, the core rod is only provided with an inserting hole with one phase angle for each centralizing body, and the phase angles of the inserting holes in the core rod are uniformly distributed; the unlocking ring is fixedly connected through a short rod, and the short rod is located in the concave portion of the centralizing body. Only when the convex part of one phase angle is eccentrically worn out, one convex part unit can be rotated, only one circle is rotated in the whole service cycle, and the transverse friction between the centralizing body and the oil pipe and the abrasion of the centralizing body to the core rod are small and negligible.

Description

Technical Field

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

[0002] As oilfield development reaches the mid-to-late stages, oil and gas production projects face an increasing number of challenges. The pumping unit is a crucial piece of equipment, and the sucker rod is a core component of the pumping well. The sucker rod is a crucial component of oil and gas production equipment. The sucker rod is connected to a rod column by couplings, with the upper end connected to the pumping unit or screw pump motor and the lower end to the pump plunger, primarily responsible for power transmission. The sucker rod moves up and down within the tubing, pumping oil through reciprocating motion. To prevent eccentric wear between the sucker rod and tubing, a sucker rod centering block is typically installed on the sucker rod to transfer the eccentric wear between the sucker rod and tubing to the space between the sucker rod centering block and the tubing.

[0003] In order to avoid unilateral wear of the outer wall of the sucker rod centralizer, the existing technology already has a rotatable sucker rod centralizer. That is, as the sucker rod strokes up and down, the sucker rod centralizer always rotates relative to the sucker rod, thereby ensuring that the outer wall of the sucker rod centralizer rubs against the oil pipe evenly in the circumferential direction, avoiding eccentric wear of the outer wall of the sucker rod centralizer.

[0004] The existing sucker rod centralizer rotates relative to the sucker rod as the sucker rod travels up and down. During this rotation, the outer wall of the sucker rod centralizer not only rubs against the inner wall of the oil pipe in the vertical direction, but also circumferential (lateral) friction. The circumferential friction consumes the centralizer without any beneficial effect, accelerating the wear of the centralizer. During the rotation, the inner wall of the sucker rod centralizer always rubs against the outer wall of the sucker rod or the core rod. The wear of the core rod caused by the circumferential friction can easily lead to its breakage. Summary of the Invention

[0005] To address the problem of continuous rotation of the sucker rod centralizer relative to the core rod, the present invention provides an energy-saving and environmentally friendly sucker rod centralizer. This device rotates one protrusion unit only after one side of the centralizer is completely worn out. After one unit of rotation, the adjacent protrusion rubs against the tubing. Once this protrusion is completely worn out, another unit of rotation occurs, and so on, until all protrusions of the centralizer are completely worn out. During its entire lifespan, the centralizer rotates only one full rotation relative to the sucker rod. As a result, lateral wear between the outer wall of the centralizer and the inner wall of the tubing is minimized, and wear of the inner wall of the centralizer on the core rod is minimized.

[0006] The technical solution provided by the present invention is: an energy-saving and environmentally friendly sucker rod centralizer, comprising a core rod, the upper and lower ends of the core rod being connected to the sucker rod coupling respectively, so that the core rod is serially connected to the sucker rod column, a centralizer body is slidingly sleeved on the core rod, a torsion spring A is arranged between the centralizer body and the core rod, and under the action of the torsion spring A, the centralizer body can rotate at least one circle relative to the core rod, the outer wall of the centralizer body comprises a convex portion and a concave portion, each convex portion respectively opens a stepped mounting hole in the radial direction of the centralizer body, and each mounting hole is sequentially installed with an outer sleeve, a limiting mechanism and a wear-resistant block from the inside to the outside, the outer sleeve can slide relative to the mounting hole, a spring A is arranged between the mounting hole and the outer sleeve, and under the elastic force of the spring A, the outer 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 sleeve, and under the restriction of the limiting mechanism, the outer sleeve cannot slide in the direction close to the wear-resistant block. The outer sleeve is provided with an insert block which is slidably inserted in the outer sleeve, and a spring B is provided between the outer sleeve and the insert block. Under the elastic force of the spring B, the insert block has a tendency to move against the core rod; an unlocking ring is slidably sleeved on the core rod between the two adjacent straightening bodies, and the unlocking ring extends between the straightening body and the core rod. A notch is provided on the unlocking ring corresponding to the position of the insert block, and the insert block can pass through the notch and rest against the core rod. The end of the insert block on the opposite side of the torsion direction of the torsion spring A has an inclined surface, so that when the unlocking ring rotates, the notch pushes the inclined surface of the insert block to force the insert block to slide in the direction away from the core rod. The core rod has only one phase angle socket for each straightening body, and the phase angles of the sockets on the core rod are evenly distributed; a short rod is provided between the upper and lower adjacent unlocking rings, and the short rod is located in the recessed part of the straightening body. The upper and lower ends of the short rod are fixedly connected to the two adjacent unlocking rings respectively. Under the connection action of the short rod, all the unlocking rings can rotate synchronously.

[0007] A further technical solution is: the inner side of the middle part of the straightening body is provided with a concave ring A, and the torsion spring A is arranged in the concave ring A. When viewed from above the straightening body, 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 is provided with a concave ring B, and a torsion spring B is arranged in the concave ring B. Under 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 straightening body, the torsion force generated by the torsion spring B causes the unlocking ring to rotate relative to the core rod in the instantaneous direction.

[0008] A further technical solution is: the limiting mechanism includes a pressing block and a rotating rod, the pressing block is pressed between the wear-resistant block and the mounting hole, one end of the rotating rod is against the outer sliding sleeve, and the other end is against the pressing block. When the wear-resistant block is worn out, the pressing block loses its restraint and moves, and 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 that the upper fixing sleeve of the core rod is provided with an upper plug, the lower fixing sleeve is provided with a lower plug, and all the centralizing bodies are located between the upper plug and the lower plug.

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

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. Existing sucker rod centralizers constantly rotate relative to the sucker rod during its up-and-down stroke. 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 the centralizer without any beneficial effect, accelerating wear. During rotation, the inner wall of the centralizer constantly rubs against the outer wall of the sucker rod or core rod. This circumferential friction wears the core rod, potentially leading to core rod breakage. In the present application, however, because the insert on one side of the centralizer is inserted into the core rod's socket, the centralizer cannot rotate relative to the sucker rod during its up-and-down stroke, resulting in partial wear on one of the centralizer's convex units. Only when the convex unit and the wear-resistant block are completely worn out, the limiting mechanism on the convex part will lose its restraint on the outer sleeve. The outer sleeve will slide toward the outside of the mounting hole under the action of spring A, thereby driving the plug to slide and pull it out of the socket. At this time, the straightening body rotates one convex unit relative to the core rod under the action of torsion spring A. The severely worn convex unit is rotated away, and the next convex unit takes on the eccentric wear. At this time, the plug on the convex unit that is subjected to eccentric wear is inserted into the socket of the core rod, and the entire straightening body is restored to a state where it cannot rotate relative to the core rod. This is analogous to the situation until all convex units on all phases are completely worn out, and the service life of the straightening body ends. It can be seen that during the entire service life of the straightening body of the present application, the straightening body only rotates one circle relative to the core rod, the lateral friction between the outer wall of the straightening body 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 straightening body is also negligible.

[0013] 2. Because all protrusions of the centralizer are fully utilized throughout its lifespan, the centralizer has a high utilization rate, effectively extending the pump inspection cycle and improving oil recovery efficiency, resulting in greater energy efficiency and efficiency. This effectively extends the pump inspection cycle, reducing the number of inspections and the amount of oil spilled at the wellhead during inspections, thus achieving a certain environmental benefit.

[0014] 3. The present application is provided with a plurality of stabilizing bodies along the core rod, and each stabilizing body has only one plug-in block of a phase angle inserted into the socket. The plug-in blocks inserted into the socket of each stabilizing body are at different phase angles, so no matter at what phase the eccentric wear occurs, the present application can be used normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present invention as a whole.

[0016] Figure 2 yes Figure 1 A local enlarged view of point I in the middle.

[0017] Figure 3 yes Figure 1 Cross-section at AA in the middle.

[0018] Figure 4 yes Figure 1 Cross-section at BB.

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

[0020] Figure 6 yes Figure 1 Cross-sectional view at DD in the middle.

[0021] Figure 7 It is a planar expansion diagram of the unlocking ring in the present invention.

[0022] Figure 8 yes Figure 7 View in the E direction.

[0023] Figure 9 This is a schematic diagram showing that the convex portion of the first phase of the first centralizing body has been completely worn away.

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

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

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

[0027] In the figure: 1. Upper plug; 2. Centralizing body; 3. Unlocking ring; 4. Concave ring A; 5. Concave ring B; 6. Core rod; 7. Lower plug; 8. Wear block; 9. Rotating rod; 10. Outer sleeve; 11. Insert block; 12. Spring A; 13. Spring B; 14. Short rod; 15. Notch; 16. Socket; 17. Press block; 18. Mounting hole. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain 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 respectively connected to sucker rod couplings, thereby connecting the core rod 6 to the sucker rod string. An upper fixed sleeve is provided with an upper plug 1, and a lower fixed sleeve is provided with a lower plug 7. Multiple centralizing bodies 2 are slidably mounted on the core rod 6 between the upper and lower plugs 1 and 7. This embodiment shows four centralizing bodies 2, but the number of centralizing bodies 2 is not limited to four. The outer wall of the centralizing body 2 adjacent to the upper plug 1 is tapered, and the outer wall of the centralizing body 2 adjacent to the lower plug 7 is also tapered.

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

[0031] The outer wall of the straightening body 2 includes a convex portion and a concave portion, and each convex portion is respectively provided with a stepped mounting hole 18 radially of the straightening body 2. Each mounting hole 18 is sequentially installed with an outer sleeve 10, a limiting mechanism and a wear-resistant block 8 from the inside to the outside. The outer sleeve 10 can slide relative to the mounting hole 18. A spring A12 is arranged between the mounting hole 18 and the outer sleeve 10. Under the elastic force of the spring A12, the outer sleeve 10 has a movement tendency 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 sleeve 10. Under the restriction of the limiting mechanism, the outer sleeve 10 cannot slide toward the direction close to the wear-resistant block 8.

[0032] In this embodiment, 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 is against the outer sleeve 10, and the other end is against the pressure block 17. When the wear-resistant block 8 is worn out, the pressure block 17 loses its restraint and can move, and then one end of the rotating rod 9 loses its restraint, and the rotating rod 9 can rotate, so that the outer 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 sleeve 10 , and a spring B13 is provided between the outer sleeve 10 and the insert block 11 . Under the elastic force of the spring B13 , the insert block 11 has a movement tendency to press against the core rod 6 .

[0034] An unlocking ring 3 is slidably mounted on the core rod 6 between two adjacent centralizing bodies 2. The unlocking ring 3 extends between the centralizing 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 rest 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 an inclined surface. When the unlocking ring 3 rotates, the notch 15 pushes the inclined surface 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 phase angle socket 16 for each centralizing body 2, and the phase angles of the sockets 16 on the core rod 6 are evenly distributed. Since each centralizing body 2 has only one plug 11 inserted into the socket 16, in the original state, all the centralizing bodies 2 cannot rotate relative to the core rod 6. Figure 3-6 As can be seen in the figure, the sockets 16 on the core rod 6 are evenly distributed along the circumference, and the inserts 11 on each centralizing body 2 are inserted into the sockets 16 at different phase angles. Therefore, no matter what phase the eccentric wear occurs in, one centralizing body 2 will play the active rotation role, while the other three centralizing bodies 2 will play a follower rotation role. Which centralizing body 2 plays the primary rotation role depends on the phase in which the eccentric wear occurs.

[0035] A short rod 14 is provided between the upper and lower 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 action of the short rod 14, all the unlocking rings 3 can rotate synchronously.

[0036] When viewed from above, the torsion force generated by torsion spring A causes the centralizing body 2 to rotate counterclockwise relative to the core rod 6. The unlocking ring 3 has a recessed ring B5 on its inner side, housing a torsion spring B. Under the torsion force of torsion spring B, the unlocking ring 3 tends to rotate relative to the core rod 6. When viewed from above, the torsion force generated by torsion spring B causes the unlocking ring 3 to rotate in the instantaneous direction relative to the core rod 6. The torsion force of torsion spring A is significantly greater than that of torsion spring B. Therefore, when the centralizing body 2 rotates under the torsion force, the unlocking ring 3 is also driven by the torsion force. When the centralizing body 2 stops rotating, the short rod 14, under the action of torsion spring B, rests against one side of the recessed portion of the centralizing body 2. The next rotation of the centralizing body 2 immediately drives the short rod 14 and the entire unlocking ring 3 to rotate.

[0037] In order to describe the working process of the present invention clearly, first set four phases. Figure 3-6In the figure, 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 centralizing bodies 2. Only one insert 11 on the protruding portion of each centralizing body 2 can be inserted into the socket 16 (the connection between the insert 11 and the socket 16 ensures that the centralizing body 2 rotates relative to the core rod 6). The inserts 11 on the other three protruding portions abut against the core rod 6. In this embodiment, the four centralizing bodies 2 have four sockets 16 corresponding to the core rod 6. The phase angles of these four sockets 16 are evenly distributed: the socket 16 corresponding to the first centralizing body 2 is in the first phase, the socket 16 corresponding to the second centralizing body 2 is in the second phase, the socket 16 corresponding to the third centralizing body 2 is in the third phase, and the socket 16 corresponding to the fourth centralizing body 2 is in the fourth phase.

[0038] 1. Assume that the eccentric wear between the four centralizers 2 and the oil pipe occurs in the first phase ( Figure 3-6 (left side of the middle figure), then the convex parts of the four straightening bodies 2 on the first phase will be worn out, that is, the four wear-resistant blocks 8 on the first phase will be completely worn away, and the pressure block 17 can move freely after losing the restraint of the wear-resistant block 8, thereby allowing the rotating rod 9 to rotate. At this time, under the elastic force of the spring A12, the sliding sleeve slides the plug block 11 to the outside of the mounting hole 18. For the first straightening body 2, the plug block 11 is pulled out of the socket 16, and the first straightening body 2 rotates counterclockwise under the action of the torsion spring A. For the other three straightening bodies 2, since the plug block 11 is not plugged into the socket 16 in the first phase, only the plug 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 recess of the straightening body 2, as shown in FIG. Figure 3-6 As shown, it can be seen that the short rod 14 leans against one side of the recess of the stabilizing body 2, and the counterclockwise rotation of the first stabilizing body 2 drives the short rod 14 to rotate, and then drives all the unlocking rings 3 to rotate, because the rotation of the unlocking ring 3 pushes the inclined portion of the plug block 11, forcing all the plug blocks 11 to slide, and will pull the plug blocks 11 of the second, third and fourth stabilizing bodies 2 out of the insertion holes 16. Therefore, under the action of their respective torsion springs A, the second, third and fourth stabilizing bodies 2 also rotate counterclockwise. Therefore, when the eccentric wear occurs in the first phase, the first stabilizing body 2 plays the role of active rotation, and the second, third and fourth stabilizing bodies 2 play the role of passive rotation. The four stabilizing bodies 2 can only rotate 90 degrees in the counterclockwise direction, because after rotating 90 degrees, each stabilizing body 2 will have an plug block 11 inserted into the insertion hole 16. After the rotation, all the convex parts on the first phase are complete and can be used for continued eccentric wearing. Figure 9 This is a schematic diagram showing that the convex portion of the first phase of the first centralizing body 2 has been worn away. Figure 10 This is a schematic diagram of the first centralizing body 2 after rotating one convex unit. Figure 11 This is a schematic diagram of the first centralizing body 2 after rotating the two convex units. Figure 12 This is a schematic diagram of the first centralizing body 2 after the three convex units are rotated.

[0039] 2. Assume that the eccentric wear between the four centralizing bodies 2 and the oil pipe occurs in the second phase ( Figure 3-6 (see the lower side of the middle figure), then the convex parts of the four straightening bodies 2 on the second phase will be worn out, that is, the four wear-resistant blocks 8 on the second phase will be completely worn away, and the pressure block 17 can move freely after losing the restraint of the wear-resistant block 8, thereby allowing the rotating rod 9 to rotate. At this time, under the elastic force of the spring A12, the sliding sleeve slides the plug block 11 to the outside of the mounting hole 18. For the second straightening body 2, the plug block 11 is pulled out of the socket 16, and the second straightening body 2 rotates counterclockwise under the action of the torsion spring A. For the other three straightening bodies 2, since the plug block 11 is not plugged into the socket 16 in the second phase, only the plug 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 recess of the straightening body 2, as shown in FIG. Figure 3-6 As shown, it can be seen that the short rod 14 leans against one side of the recess of the stabilizing body 2, and the counterclockwise rotation of the second stabilizing body 2 drives the short rod 14 to rotate, and then drives all the unlocking rings 3 to rotate, because the rotation of the unlocking ring 3 pushes the inclined portion of the plug block 11, forcing all the plug blocks 11 to slide, and will pull the plug blocks 11 of the first, third and fourth stabilizing bodies 2 out of the insertion holes 16. Therefore, under the action of their respective torsion springs A, the first, third and fourth stabilizing bodies 2 also rotate counterclockwise. Therefore, when the eccentric wear occurs in the second phase, the second stabilizing body 2 plays the role of active rotation, and the first, third and fourth stabilizing bodies 2 play the role of passive rotation. The four stabilizing bodies 2 can only rotate 90 degrees in the counterclockwise direction, because after rotating 90 degrees, each stabilizing body 2 will have an plug block 11 inserted into the insertion hole 16. After the rotation, all the convex parts on the second phase are complete and can be used for continued eccentric wearing.

[0040] 3. Assume that the eccentric wear between the four centralizers 2 and the oil pipe occurs in the third phase ( Figure 3-6(right side of the middle figure), then the convex parts of the four straightening bodies 2 in the third phase will be worn out, that is, the four wear-resistant blocks 8 in the third phase will be completely worn away, and the pressure block 17 can move freely after losing the restraint of the wear-resistant block 8, thereby allowing the rotating rod 9 to rotate. At this time, under the elastic force of the spring A12, the sliding sleeve slides the plug block 11 to the outside of the mounting hole 18. For the third straightening body 2, the plug block 11 is pulled out of the socket 16, and the third straightening body 2 rotates in the counterclockwise direction under the action of the torsion spring A. For the other three straightening bodies 2, since the plug block 11 is not plugged into the socket 16 in the third phase, only the plug block 11 in 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 recess of the straightening body 2, as shown in FIG. Figure 3-6 As shown, it can be seen that the short rod 14 leans against one side of the recess of the stabilizing body 2, and the counterclockwise rotation of the third stabilizing body 2 drives the short rod 14 to rotate, and then drives all the unlocking rings 3 to rotate, because the rotation of the unlocking ring 3 pushes the inclined portion of the plug block 11, forcing all the plug blocks 11 to slide, and will pull the plug blocks 11 of the first stabilizing body 2, the second stabilizing body 2 and the fourth stabilizing body 2 out of the insertion hole 16. Therefore, under the action of their respective torsion springs A, the first stabilizing body 2, the second stabilizing body 2 and the fourth stabilizing body 2 also rotate counterclockwise. Therefore, when the eccentric wear occurs in the third phase, the third stabilizing body 2 plays the role of active rotation, and the first stabilizing body 2, the second stabilizing body 2 and the fourth stabilizing body 2 play the role of passive rotation. The four stabilizing bodies 2 can only rotate 90 degrees in the counterclockwise direction, because after rotating 90 degrees, each stabilizing body 2 will have an plug block 11 inserted into the insertion hole 16. After the rotation, all the convex parts on the third phase are complete and can be used for continued eccentric wearing.

[0041] 4. Assume that the eccentric wear between the four centralizers 2 and the oil pipe occurs in the fourth phase ( Figure 3-6 (right side of the middle figure), then the convex parts of the four straightening bodies 2 in the fourth phase will be worn out, that is, the four wear-resistant blocks 8 in the fourth phase will be completely worn away, and the pressure block 17 can move freely after losing the restraint of the wear-resistant block 8, thereby allowing the rotating rod 9 to rotate. At this time, under the elastic force of the spring A12, the sliding sleeve slides the plug block 11 to the outside of the mounting hole 18. For the fourth straightening body 2, the plug block 11 is pulled out of the socket 16, and the fourth straightening body 2 rotates in the counterclockwise direction under the action of the torsion spring A. For the other three straightening bodies 2, since the plug block 11 is not plugged into the socket 16 in the fourth phase, only the plug block 11 in 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 recess of the straightening body 2, as shown in FIG. Figure 3-6As shown, it can be seen that the short rod 14 leans against one side of the recess of the stabilizing body 2, and the counterclockwise rotation of the fourth stabilizing body 2 drives the short rod 14 to rotate, and then drives all the unlocking rings 3 to rotate, because the rotation of the unlocking ring 3 pushes the inclined portion of the plug 11, forcing all the plugs 11 to slide, and will pull the plugs 11 of the first stabilizing body 2, the second stabilizing body 2 and the third stabilizing body 2 out of the insertion hole 16. Therefore, under the action of their respective torsion springs A, the first stabilizing body 2, the second stabilizing body 2 and the third stabilizing body 2 also rotate counterclockwise. Therefore, when the eccentric wear occurs in the fourth phase, the fourth stabilizing body 2 plays the role of active rotation, and the first stabilizing body 2, the second stabilizing body 2 and the third stabilizing body 2 play the role of passive rotation. The four stabilizing bodies 2 can only rotate 90 degrees in the counterclockwise direction, because after rotating 90 degrees, each stabilizing body 2 will have an plug 11 inserted into the insertion hole 16. After the rotation, all the convex parts on the fourth phase are complete and can be used for continued eccentric wearing.

[0042] Through the above working process, it can be known that the present application will rotate a convex unit as a whole only when one of the convex parts of the phase angle is worn out, and will not always rotate relative to the sucker rod. During the entire service life of the straightening body 2 of the present application, the straightening body 2 only rotates one circle relative to the core rod 6, and the lateral friction between the outer wall of the straightening body 2 and the inner wall of the oil pipe is small enough to be ignored, and the wear of the core rod 6 caused by the rotation of the inner wall of the straightening body 2 is also small enough to be ignored. During the entire service life of the straightening body 2 of the present application, all the convex parts will be used up, so the utilization rate of the straightening body 2 is extremely high, which effectively extends the pump inspection cycle and improves the oil production efficiency, thus being more energy-saving and efficient. Since pump inspection or replacement of a new sucker rod straightening body 2 will inevitably leave oil stains at the wellhead, and the present application has an extremely high utilization rate, thus extending the pump inspection or replacement cycle, thereby reducing the number of wellhead pollutions and being more environmentally friendly.

Claims

1. An energy-saving and environmentally friendly sucker rod centralizer, characterized by: The invention comprises a core rod (6), a centralizing body (2) is slidably mounted on the core rod (6), a torsion spring A is arranged between each centralizing body (2) and the core rod (6), and under the action of the torsion spring A, the centralizing body (2) can rotate at least one circle relative to the core rod (6), the outer wall of the centralizing body (2) comprises a convex portion and a concave portion, each convex portion is provided with a stepped mounting hole (18) in the radial direction of the centralizing body (2), each mounting hole (18) is sequentially mounted with an outer sleeve (10), a limiting mechanism and a wear-resistant block (8) from the inside to the outside, the outer sleeve (10) can slide relative to the mounting hole (18), and the mounting hole (18) and the outer sleeve (10) are connected. A spring A (12) is provided. Under the elastic force of the spring A (12), the outer 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 sleeve (10). Under the restriction of the limiting mechanism, the outer sleeve (10) cannot slide in a direction close to the wear-resistant block (8). An insert block (11) is slidably inserted in the outer sleeve (10). A spring B (13) is provided between the outer sleeve (10) and the insert block (11). Under the elastic force of the spring B (13), the insert block (11) has a tendency to move against the core rod (6). An unlocking ring (3) is slidably mounted on 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 plug block (11). The plug block (11) can pass through the notch (15). The end of the plug block (11) on the opposite side of the torsion direction of the torsion spring A has an inclined surface. When the unlocking ring (3) rotates, the notch (15) pushes the inclined surface of the plug block (11) to force the plug block (11) to slide in a direction away from the core rod (6). The core rod (6) only has one phase angle socket (16) for each straightening body (2). The phase angles of the sockets (16) on the core rod (6) are evenly distributed. A short rod (14) is provided between the upper and lower adjacent unlocking rings (3). The short rod (14) is located in the concave portion 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).

2. The energy-saving and environmentally friendly sucker rod centralizer according to claim 1, characterized in that: The inner side of the middle part of the straightening body (2) is provided with a concave ring A (4), and the torsion spring A is arranged in the concave ring A (4). When viewed from above the straightening body (2), the torsion force generated by the torsion spring A causes the straightening body (2) to rotate counterclockwise relative to the core rod (6); the inner side of the middle part of the unlocking ring (3) is provided with a concave ring B (5), and a torsion spring B is arranged in the concave ring B (5). Under the torsion force of the torsion spring B, the unlocking ring (3) has a movement tendency to rotate relative to the core rod (6). When viewed from above the straightening body (2), the torsion force generated by the torsion spring B causes the unlocking ring (3) to rotate relative to the core rod (6) along the instantaneous direction, and the torsion force of the torsion spring A is greater than the torsion force of the torsion spring B.

3. The energy-saving and environmentally friendly sucker rod centralizer according to claim 1, characterized in that: The limiting mechanism includes a pressing block (17) and a rotating rod (9). The pressing block (17) is pressed between the wear-resistant block (8) and the mounting hole (18). One end of the rotating rod (9) is against the outer sleeve (10), and the other end is against the pressing block (17). When the wear-resistant block (8) is worn out, the pressing block (17) loses its restraint and moves, and then one end of the rotating rod (9) loses its restraint, and the rotating rod (9) rotates, so that the outer sleeve (10) can slide outward in the mounting hole (18).

4. The energy-saving and environmentally friendly sucker rod centralizer according to claim 1, characterized in that: The upper fixed sleeve of the core rod (6) is provided with an upper plug (1), and the lower fixed sleeve is provided with a lower plug (7), and all the centralizing bodies (2) are located between the upper plug (1) and the lower plug (7).

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

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