A sucker rod anti-tripping device

Abstract

The utility model discloses a sucker rod anti-tripping device relates to sucker rod connecting equipment technical field, including the female buckle connecting sleeve and the male buckle connector, be provided with the ball head outer sleeve and the ball head connecting rod between the female buckle connecting sleeve and the male buckle connector, the ball head outer sleeve is connected with the male buckle connector, the ball head connecting rod bottom fixed mounting is in the female buckle connecting sleeve, the ball head outer sleeve inside is located one axial installation cavity, the ball head connecting rod top end inserts in the axial installation cavity inside cooperation with it, the ball head connecting rod top end's spherical part inserts and is contained in the installation cavity inside, through the ball hinge connection design, makes male, female buckle connection place can realize multi -angle flexible deflection, greatly enhanced the sucker rod string to the downhole curved borehole, rod string flexure etc. Complex working condition's adaptability, effectively released the alternating stress and the bending stress, prevented the thread fatigue loosening accident from stress concentration fundamentally, and the operation safety and reliability are greatly promoted.

Description

Technical Field

[0001] This utility model relates to the technical field of sucker rod connection equipment, specifically a sucker rod anti-disengagement device. Background Technology

[0002] As the core transmission component of a rod-pumped oil pump system, the reliability of the sucker rod's threaded connection directly affects the efficiency and safety of the entire lifting system. In actual oilfield production, the sucker rod string operates within wellbores thousands of meters deep, under extremely complex conditions. It not only bears enormous alternating tensile-tensile loads and cyclic stresses, but also often experiences complex bending stresses and lateral forces due to the unavoidable bending of the wellbore trajectory (such as in directional and horizontal wells) and the buckling effect of the rod string itself. These forces are transmitted to the threaded connection of the sucker rod. Traditional sucker rod connections are rigid, meaning the male and female threads cannot undergo relative angular displacement after being tightened by the threads. Under the complex alternating loads and bending moments described above, significant stress concentration occurs at the threaded connection. Under cyclic loads, minute relative movement (fretting wear) occurs between the nut and bolt, leading to a gradual loss of preload and resulting in thread loosening, or "disengagement." This necessitates the removal of the entire rod string for repair (i.e., "pump inspection"), which is costly and can cause well shutdowns, resulting in substantial economic losses. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a sucker rod anti-disengagement device that allows the male and female connection points to deflect flexibly at multiple angles, greatly enhancing the adaptability of the sucker rod string to complex working conditions such as downhole curved wellbore and rod string buckling.

[0004] The objective of this utility model is achieved through the following technical solution: A sucker rod anti-disengagement device includes a female buckle connecting sleeve and a male buckle connecting head. A ball head sleeve and a ball head connecting rod are provided between the female buckle connecting sleeve and the male buckle connecting head. The ball head sleeve is connected to the male buckle connecting head. The bottom of the ball head connecting rod is fixedly installed on the female buckle connecting sleeve. An axial mounting cavity is opened inside the ball head sleeve. The top end of the ball head connecting rod is inserted into the axial mounting cavity that mates with it. The ball portion at the top end of the ball head connecting rod is inserted into and accommodated inside the mounting cavity.

[0005] Preferably, the axial mounting cavity is provided with a first ball seat and a second ball seat that mate with the ball portion of the ball joint, and the ball portion is clamped between the first ball seat and the second ball seat.

[0006] Preferably, a first base is further provided inside the axial mounting cavity. The first base is fixedly located below the first ball seat. A radial hole is provided on the side wall of the ball head sleeve. A flat pushing component is provided in the radial hole. The flat pushing component is used to drive the first ball seat to move axially to adjust the gap between the first ball seat and the second ball seat.

[0007] Preferably, the push assembly includes a nut seat, a screw, a push rod, and a wedge, with the nut seat fixedly installed in the radial hole. The screw is threadedly connected to the nut seat, and one end of the screw extending into the radial hole is rotatably connected to the push rod. The wedge is installed at the end of the push rod.

[0008] Preferably, a sealing ring is fitted onto the ball joint connecting rod, and an annular groove is formed on the inner wall of the ball joint outer sleeve.

[0009] The beneficial effects of this utility model are: The ball joint connection design allows for flexible deflection at multiple angles at the male and female thread connections, greatly enhancing the adaptability of the sucker rod string to complex working conditions such as downhole curved wellbore and rod string buckling. It effectively releases alternating stress and bending stress, preventing thread fatigue loosening accidents caused by stress concentration from the root, and significantly improving operational safety and reliability. The ball head is held by the first and second ball seats, and an innovative wedge-based push adjustment component is designed to achieve stepless and precise adjustment of the ball joint clearance and preload. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the planar structure of the present invention; Figure 3 For the present utility model Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle; In the diagram, 1. Female connecting sleeve; 2. Ball joint connecting rod; 3. Ball joint outer sleeve; 4. First ball seat; 5. Second ball seat; 6. Male connecting head; 7. First base; 8. Flat push assembly; 81. Screw; 82. Nut seat; 83. Push rod; 84. Wedge block; 9. Sealing ring. Detailed Implementation

[0011] like Figures 1-2As shown, a sucker rod anti-disengagement device is provided, including a female coupling sleeve 1 and a male coupling head 6. A ball joint sleeve 3 and a ball joint connecting rod 2 are provided between the female coupling sleeve 1 and the male coupling head 6. The ball joint sleeve 3 is connected to the male coupling head 6. The bottom of the ball joint connecting rod 2 is fixedly installed on the female coupling sleeve 1. An axial mounting cavity is opened inside the ball joint sleeve 3. The top end of the ball joint connecting rod 2 is inserted into the axial mounting cavity that mates with it. The top end of the ball joint connecting rod 2, with its spherical part inserted into and accommodated inside the axial mounting cavity, forms a ball joint connection that allows a certain angle of deflection to adapt to the complex stress state downhole.

[0012] Preferably, to optimize the fixing and load-bearing capacity of the ball head, the axial mounting cavity is provided with a first ball seat 4 and a second ball seat 5 that mate with the ball portion of the ball head connecting rod 2. The ball portion is clamped between the first ball seat 4 and the second ball seat 5, and the damping and preload of the ball head rotation can be controlled by adjusting the gap between the two ball seats.

[0013] To further achieve adjustable clearance, a first base 7 is installed at the bottom of the axial mounting cavity, and the first base 7 is fixed in the axial mounting cavity. A radial hole is formed on the side wall of the ball joint sleeve 3, and a push assembly 8 is installed in the radial hole. The push assembly 8 is pushed or pushed out horizontally along the radial direction to drive the first ball seat 4 to move axially, thereby precisely adjusting the clearance between the first ball seat 4 and the second ball seat 5. Specifically, the push assembly 8 includes a nut seat 82, a screw 81, a push rod 83, and a wedge 84. The nut seat 82 is fixedly installed in the radial hole. The screw 81 is threadedly connected to the nut seat 82. One end of the screw 81 that extends into the radial hole is rotatably connected to the push rod 83, and the end of the push rod 83 is equipped with a wedge 84. By rotating the screw 81, the push rod 83 and the wedge 84 can be pushed forward, so that the wedge 84 is inserted into the clearance between the first ball seat 4 and the first base 7. The wedge 84 uses the first base 7 as a support point and its inclined surface to convert the radial thrust into an axial force, thereby pushing the first ball seat 4 upward toward the second ball seat 5, achieving the effect of reducing the clearance and increasing the preload. The wedge 84 can be retracted by rotating the screw 81 in the opposite direction, and the first ball seat 4 can be reset under downhole load or with the help of tools, thus increasing the clearance.

[0014] Preferably, in order to ensure the sealing of downhole operations and prevent impurities such as mud and sand from entering the ball joint, a sealing ring 9 is fitted on the ball joint connecting rod 2. Correspondingly, an annular groove is provided on the inner wall of the ball joint outer sleeve 3 to accommodate and restrict the axial sliding of the sealing ring 9, so as to ensure that a good dynamic seal can still be maintained when the ball joint deflects.

Claims

1. A sucker rod anti-disengagement device, characterized in that, Includes a female buckle connecting sleeve (1) and a male buckle connecting head (6). A ball head sleeve (3) and a ball head connecting rod (2) are provided between the female buckle connecting sleeve (1) and the male buckle connecting head (6). The ball head sleeve (3) is connected to the male buckle connecting head (6). The bottom of the ball head connecting rod (2) is fixedly installed on the female buckle connecting sleeve (1). An axial mounting cavity is opened inside the ball head sleeve (3). The top end of the ball head connecting rod (2) is inserted into the axial mounting cavity that mates with it. The ball part at the top end of the ball head connecting rod (2) is inserted into and accommodated inside the axial mounting cavity. The axial mounting cavity is provided with a first ball seat (4) and a second ball seat (5) that cooperate with the ball part of the ball joint (2), and the ball part is clamped between the first ball seat (4) and the second ball seat (5); The axial mounting cavity is also provided with a first base (7), which is fixedly located below the first ball seat (4). A radial hole is provided on the side wall of the ball head sleeve (3), and a flat push assembly (8) is provided in the radial hole. The flat push assembly (8) is used to drive the first ball seat (4) to move axially to adjust the gap between the first ball seat (4) and the second ball seat (5). The push assembly (8) includes a nut seat (82), a screw (81), a push rod (83), and a wedge (84), wherein the nut seat (82) is fixedly installed in the radial hole; The screw (81) is threadedly connected to the nut seat (82), and one end of the screw (81) that extends into the radial hole is rotatably connected to the push rod (83). The wedge (84) is installed at the end of the push rod (83).

2. The sucker rod anti-disengagement device according to claim 1, characterized in that, A sealing ring (9) is fitted on the ball joint connecting rod (2), and an annular groove is formed on the inner wall of the ball joint outer sleeve (3).

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