Special anti-falling solid sucker rod for spiral guiding and centralizing screw pump

Abstract

An anti-falling solid sucker rod special for a spiral guiding and centralizing screw pump relates to the technical field of sucker rods and comprises a sucker rod body, a plurality of paraffin scrapers are rotatably arranged on the sucker rod body in parallel in the axial direction, lining tile sleeves corresponding to the paraffin scrapers are fixed on the sucker rod body, and the paraffin scrapers are rotatably mounted on the lining tile sleeves. An embedded concave rod head is arranged at the upper end part of the sucker rod body, an embedded convex rod head is arranged at the lower end part of the sucker rod body, the embedded concave rod head and the embedded convex rod head on the adjacent sucker rod body are fixed through a coupling, and the sucker rod body is also provided with an opposite jacking type locking structure for restraining the axial position of the coupling. The sucker rod solves the problems that when a wax scraper on a sucker rod in the prior art is used, the rod body is abraded due to the fact that the wax scraper rotates in the circumferential direction, and the working stability is affected due to the fact that the wax scraper moves in the axial direction of the rod body along with rotation of the wax scraper.

Description

Technical Field

[0001] This utility model relates to the field of sucker rod technology, specifically to a solid sucker rod for anti-detachment in a spiral-guided and centralizing screw pump. Background Technology

[0002] There are two types of sucker rods that drive the rotation of downhole screw pumps in oilfields: ordinary sucker rods and screw pump-specific sucker rods. Ordinary sucker rods, originally designed for transmitting axial tension during the reciprocating motion of the pumping unit, lack sufficient torsional resistance when driving the screw pump, frequently resulting in rod breakage, disengagement, and buckling. Furthermore, because the connecting threads rotate in the same direction as the pump, they become excessively tight after a period of operation, making disassembly extremely difficult. While screw pump-specific sucker rods employ cross-joints or other connection methods to overcome some of the disengagement and buckling issues, the torsional resistance at the joint is significantly lower than that of the rod itself. This often leads to joint breakage and coupling disengagement, causing the sucker rod to detach and fail, affecting pump operation and ultimately resulting in well shutdown.

[0003] A prior art patent, CN2606171Y, discloses an upper connector with external threads, featuring a concave wedge-shaped groove on its end face and a convex wedge-shaped groove on its end face. The upper and lower connectors are fixedly connected to both ends of the rod body. A coupling is fitted onto the rod body at the lower connector, with the shoulder of the lower connector providing restraint, thus forming a single screw pump sucker rod. The convex wedge shape of the lower connector of the single sucker rod is inserted into the concave wedge-shaped groove of the upper connector of another sucker rod, and the two sucker rods are connected by the internal thread of the coupling. Multiple single sucker rods can be sequentially connected end-to-end to assemble a sucker rod string of the required length, as needed.

[0004] With use, existing devices, including those mentioned above, have gradually revealed shortcomings in this technology, mainly in the following aspects:

[0005] First, the existing wax scraper on the sucker rod causes wear on the rod body during use because the scraper rotates circumferentially. Furthermore, as it rotates, it is prone to axial movement along the rod body, affecting the stability of the operation.

[0006] Secondly, when adjacent sucker rods are connected, under extreme conditions, the threads at the connection point may loosen, leading to increased clearance and affecting the stability of torque transmission.

[0007] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] In view of the defects in the prior art, this utility model solves the problems of the wax scraper on the sucker rod in the traditional technology. During use, the wax scraper rotates around the circumference, causing wear on the rod body. Furthermore, as it rotates, it is easy for the scraper to move axially along the rod body, affecting the stability of operation. Also, when adjacent sucker rods are connected, under extreme conditions, the threads at the connection point are prone to loosening, resulting in increased gaps and affecting the stability of torque transmission.

[0009] To solve the above problems, this utility model provides the following technical solution:

[0010] A solid sucker rod for spiral-guided, centering screw pumps, designed to prevent detachment, includes a sucker rod body. Several wax scrapers are rotatably arranged in parallel along the axial direction on the sucker rod body. A bushing is fixed to each wax scraper on the sucker rod body, and the wax scrapers are rotatably mounted on the bushings.

[0011] The upper end of the sucker rod body is provided with an embedded concave rod head, and the lower end of the sucker rod body is provided with an embedded convex rod head. The embedded concave rod heads and embedded convex rod heads on adjacent sucker rod bodies are fixed together by a coupling. The sucker rod body is also provided with a top-to-top locking structure that constrains the axial position of the coupling.

[0012] As an optimized solution, a convex ring structure is fixedly connected circumferentially to the outer wall of the liner, and an annular groove matching the convex ring structure is opened on the inner wall of the wax scraper.

[0013] As an optimized solution, limit sleeves are fixed to the areas on the upper and lower sides of the liner sleeve, respectively, of the sucker rod body.

[0014] As an optimized solution, a protruding section is fixedly connected to the sucker rod body, and a groove matching the protruding section is formed on the inner wall of the limiting sleeve.

[0015] As an optimized solution, the top-mounted locking structure includes a pressure cap threaded to the sucker rod body, the pressure cap abutting against the upper end of the coupling, a stepped groove being provided near the upper end of the coupling, and two back caps threaded in parallel on the sucker rod body, the upper back cap abutting against the stepped groove.

[0016] As an optimized solution, a retaining ring is fitted onto the sucker rod body, and the retaining ring abuts against the back cap located below.

[0017] As an optimized solution, the inner wall of the lower port of the coupling is provided with a left-hand thread structure, and the outer wall of the inlaid concave rod head is provided with a thread structure that matches the left-hand thread structure.

[0018] As an optimized solution, the outer wall of the wax scraper is provided with four wax scraping ribs in a spiral shape.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] The limiting block is injection molded in one piece, with strong locking force and is not easy to fall off; the main function of the limiting block is to limit the movement of the wax scraper.

[0021] The lining is made of nylon, which is a high-temperature resistant and wear-resistant high-quality nylon with a raised ring structure on the surface. When the stabilizer is subjected to a large force, it can effectively prevent the axial movement of the wax scraper.

[0022] The wax scraper has four spiral scraping ribs, which can scrape wax from all directions, and the wax and dirt removal effect is obvious.

[0023] The wax scraper can rotate freely on the rod, which prevents uneven wear and reduces oil flow resistance. The rotation of the wax scraper can improve the wax removal effect and reduce the risk of disassembly.

[0024] A nylon bushing protects the scraper from wear during scraper rotation, providing double protection for the scraper and tube.

[0025] The inlaid convex rod head and the inlaid concave rod head adopt a "V" type plug-in structure. The torque is transmitted between the connected rod columns by the wedge-shaped surface. It has sufficient shear strength and is always in the plug-in state, mutually restraining each other and achieving the purpose of preventing detachment.

[0026] The coupling adopts a one-end threaded connection structure, and the thread adopts a left-hand thread structure, which solves the problems of stripping and sticking.

[0027] Double back caps provide secure locking, and pressure caps tighten the connection, preventing loosening of threads under extreme conditions. This allows for gapless connection and smooth torque transmission. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the wax scraper of this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the coupling of this utility model.

[0032] In the diagram: 1-Sucker rod body; 2-Limit sleeve; 3-Protruding section; 4-Wax scraper; 5-Wax scraper rib; 6-Rinse sleeve; 7-Protruding ring structure; 8-Joint; 9-Pressure cap; 10-Back cap; 11-Clamping ring; 12-Step groove; 13-Inlaid convex rod head; 14-Inlaid concave rod head. Detailed Implementation

[0033] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0034] like Figures 1 to 3 As shown, the special anti-detachment solid sucker rod for the spiral guide centering screw pump includes a sucker rod body 1. Several wax scrapers 4 are rotatably arranged in parallel along the axial direction on the sucker rod body 1. A bushing 6 is fixed to each wax scraper 4 on the sucker rod body 1, and the wax scraper 4 is rotatably mounted on the bushing 6.

[0035] The upper end of the sucker rod body 1 is provided with an embedded concave rod head 14, and the lower end of the sucker rod body 1 is provided with an embedded convex rod head 13. The embedded concave rod heads 14 and embedded convex rod heads 13 on adjacent sucker rod bodies 1 are fixed together by a coupling 8. The sucker rod body 1 is also provided with a top-to-top locking structure that constrains the axial position of the coupling 8.

[0036] The outer wall of the lining sleeve 6 is fixed with a convex ring structure 7 along the circumference, and the inner wall of the wax scraper 4 is provided with an annular groove that matches the convex ring structure 7.

[0037] Limit sleeves 2 are fixed in the areas above and below the liner sleeve 6 on the sucker rod body 1.

[0038] A protruding section 3 is fixedly connected to the sucker rod body 1, and a groove matching the protruding section 3 is opened on the inner wall of the limiting sleeve 2.

[0039] The top-type locking structure includes a pressure cap 9 threadedly connected to the sucker rod body 1. The pressure cap 9 abuts against the upper end of the coupling 8. A stepped groove 12 is provided near the upper end of the coupling 8. Two back caps 10 are also threadedly connected in parallel on the sucker rod body 1. The upper back cap 10 abuts against the stepped groove 12.

[0040] A retaining ring 11 is fitted onto the sucker rod body 1, and the retaining ring 11 abuts against the back cap 10 located below.

[0041] The inner wall of the lower port of the coupling 8 is provided with a left-hand thread structure, and the outer wall of the inlaid concave rod head 14 is provided with a thread structure that matches the left-hand thread structure.

[0042] The outer wall of the wax scraper 4 has four spiral-shaped wax scraping ribs 5.

[0043] When connecting two adjacent rods, first screw the pressure cap 9 onto the rod, then use the upper end of the coupling 8 to fit onto the rod, then screw in the two back caps 10, then insert the adjacent rods using the concave rod head and the convex rod head, then screw the coupling 8 so that its left-hand thread structure is screwed onto the thread structure, then tighten the pressure cap 9, and use the back cap 10 and the pressure cap 9 to lock the coupling 8.

[0044] The working principle of this device is as follows:

[0045] The limiting block is injection molded in one piece, with strong locking force and is not easy to fall off; the main function of the limiting block is to limit the movement of the wax scraper 4.

[0046] The lining sleeve 6 is made of nylon. The nylon lining material is high-temperature resistant and wear-resistant high-quality nylon, and the surface has a raised ring structure 7. When the stabilizer is subjected to a large force, it can effectively prevent the axial movement of the wax scraper 4.

[0047] The wax scraper has four spiral scraping ribs, which can scrape wax from all directions, and the wax and dirt removal effect is obvious.

[0048] The wax scraper 4 can rotate freely on the rod body, which prevents uneven wear and reduces oil flow resistance. The rotation of the wax scraper 4 can improve the wax removal effect and reduce the risk of disassembly.

[0049] The wax scraper 4 is protected by a nylon bushing between itself and the rod body. During the rotation of the wax scraper 4, the rod body is effectively protected from wear, providing double protection for the rod and tube.

[0050] The inlaid convex rod head 13 and the inlaid concave rod head 14 adopt a "V" type plug-in structure. The torque is transmitted between the connected rods by the wedge-shaped surface, which has sufficient shear strength and is always in the plug-in state, mutually restraining each other and achieving the purpose of preventing detachment.

[0051] The coupling 8 adopts a one-end threaded connection structure, and the thread adopts a left-hand thread structure, which solves the problems of stripping and sticking.

[0052] The double back cap 10 is tightened for reliable locking, and the pressure cap 9 is pressed to prevent the threads at the connection from loosening under extreme conditions, thus achieving a gapless connection and smooth torque transmission.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A solid sucker rod for anti-detachment in spiral-guided and centering screw pumps, characterized in that: The device includes a sucker rod body (1), on which a plurality of wax scrapers (4) are arranged in parallel and rotatable along the axial direction. A bushing (6) is fixed on the sucker rod body (1) corresponding to each of the wax scrapers (4), and the wax scrapers (4) are rotatably mounted on the bushing (6). The upper end of the sucker rod body (1) is provided with an inlaid concave rod head (14), and the lower end of the sucker rod body (1) is provided with an inlaid convex rod head (13). The inlaid concave rod heads (14) and inlaid convex rod heads (13) on adjacent sucker rod bodies (1) are fixed together by a coupling (8). The sucker rod body (1) is also provided with a top-to-top locking structure that constrains the axial position of the coupling (8).

2. The solid sucker rod for anti-detachment in a spiral-guided, centralizing screw pump according to claim 1, characterized in that: The outer wall of the liner sleeve (6) is fixed with a convex ring structure (7) along the circumference, and the inner wall of the wax scraper (4) is provided with an annular groove that matches the convex ring structure (7).

3. The solid sucker rod for anti-detachment in a spiral-guided, centralizing screw pump according to claim 1, characterized in that: Limit sleeves (2) are fixed to the upper and lower sides of the sucker rod body (1) located on the liner sleeve (6).

4. The solid sucker rod for anti-detachment in a spiral-guided centering screw pump according to claim 3, characterized in that: The sucker rod body (1) is fixedly connected to a protruding section (3), and the inner wall of the limiting sleeve (2) is provided with a groove that matches the protruding section (3).

5. The solid sucker rod for anti-detachment in a spiral-guided centering screw pump according to claim 1, characterized in that: The top-mounted locking structure includes a pressure cap (9) threadedly connected to the sucker rod body (1), the pressure cap (9) abutting against the upper end of the coupling (8), the coupling (8) having a stepped groove (12) near the upper end, and two back caps (10) threadedly connected side-by-side to the sucker rod body (1), the upper back cap (10) abutting against the stepped groove (12).

6. The solid sucker rod for anti-detachment in a spiral-guided centering screw pump according to claim 5, characterized in that: A retaining ring (11) is fitted onto the sucker rod body (1), and the retaining ring (11) abuts against the back cap (10) located below.

7. The solid sucker rod for anti-detachment in a spiral-guided centering screw pump according to claim 1, characterized in that: The inner wall of the lower port of the coupling (8) is provided with a left-hand thread structure, and the outer wall of the inlaid concave rod head (14) is provided with a thread structure that matches the left-hand thread structure.

8. The solid sucker rod for anti-detachment in a spiral-guided centering screw pump according to claim 1, characterized in that: The outer wall of the wax scraper (4) is provided with four wax scraping ribs (5) in a spiral shape.

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