Anti-falling centralizer for clockwise rotating sucker rod

Abstract

The utility model discloses a clockwise rotation sucker rod anti-falling centralizer which comprises a centralizing assembly used for centralizing and antifriction of a sucker rod and a connecting assembly used for being in butt joint with a sucker rod string, the connecting assembly is arranged on the centralizing assembly, and an anti-falling assembly used for one-way locking is arranged in the connecting assembly. An outer sleeve used for wrapping the anti-disengaging assembly is arranged between the centralizing assembly and the connecting assembly. By means of the linkage design of the anti-disengaging assembly and the upper spiral angle teeth, the functions that the sucker rod is clamped and prevented from disengaging during clockwise rotation and is loosened and convenient to install during anticlockwise rotation are achieved, and the technical problem that in the prior art, the sucker rod is prone to disengaging is solved; meanwhile, when the oil rod reciprocates up and down, the anti-falling centralizer is driven through the pressure of the liquid amount, eccentric wear of the oil rod is prevented through rotation of the anti-falling centralizer, and oil field production equipment such as the oil rod and an oil pipe is protected; underground accidents caused by breakage and falling of the oil rod are avoided, the maintenance cost is saved, the productivity of an oil well is improved, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] This utility model relates to the field of oilfield operation tools, and in particular to a clockwise rotating sucker rod anti-detachment and centralizing device. Background Technology

[0002] An oil field refers to a specific area where crude oil is produced. Sometimes it is a general term for oil-bearing layers that accumulate underground in a specific region. Oil is naturally occurring hydrocarbon underground, which is liquid under surface conditions.

[0003] As oilfields intensify their efforts to tap potential and formation energy gradually declines, rod pump oil production has become the primary production method. Due to the prolonged reciprocating motion of the sucker rod, the increased weight and load on the rod during fluid flow make it prone to rod detachment. Currently, sucker rod detachment occurs frequently in production, sometimes even causing pump jamming, leading to prolonged well shutdowns, well accidents, reduced production capacity, and increased well workover costs.

[0004] Therefore, a clockwise rotation of the sucker rod to prevent slippage and stabilize the rod is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a clockwise rotating sucker rod anti-detachment and centering device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] Rotate the sucker rod clockwise to prevent it from slipping out and to stabilize it. (Includes:)

[0008] A centering assembly for reducing friction in the oil rod and a connecting assembly for docking with the sucker rod string, the connecting assembly being mounted on the centering assembly, the connecting assembly having an internal anti-derailment component for one-way locking, and a common outer sleeve for enclosing the anti-derailment component between the centering assembly and the connecting assembly, wherein:

[0009] The anti-detachment component includes an anti-detachment rod located in the inner cavity of the connecting component and the outer casing. The anti-detachment rod is provided with a pin for connecting it to the connecting component and restricting circumferential rotation. The inner cavity of the connecting component is also provided with a spring. One end of the spring abuts against the anti-detachment rod. The end of the anti-detachment rod away from the spring is integrally formed with a lower helical angle tooth. The lower helical angle tooth is located at one end of the straightening component.

[0010] As a preferred technical solution, the straightening assembly includes a straightening rod, the middle of which is fitted with a nylon sleeve. The bottom end of the straightening rod extends through the inner cavity of the sleeve and is integrally formed with an upper helical tooth. The upper helical tooth meshes with the lower helical tooth. When the sucker rod rotates clockwise, the upper and lower helical teeth mesh and lock. When it rotates counterclockwise, the spring pushes the anti-disengagement rod to separate the upper and lower helical teeth, achieving one-way locking.

[0011] As a preferred technical solution, the connecting assembly includes a male threaded connector that is threaded onto the top of the centralizing rod and connected to the sucker rod string; the inner cavity of the outer sleeve is threadedly connected to a female clamp connecting sleeve that mates with the downhole tubing string; the anti-disengagement rod and the spring are both placed in the inner cavity of the female clamp connecting sleeve; and the pin is inserted between the anti-disengagement rod and the female clamp connecting sleeve.

[0012] As a preferred technical solution, a gap is formed between the top end of the female clamp connecting sleeve and the upper helical angle tooth, and the lower helical angle tooth is located within the gap.

[0013] As a preferred technical solution, the straightening rod is a high-strength alloy steel straightening rod, and the outer surface of the nylon sleeve is coated with a molybdenum disulfide wear-resistant coating.

[0014] As a preferred technical solution, the pin is a cylindrical pin that passes laterally through the inner hole of the female clamp connecting sleeve and the pin hole of the anti-disengagement rod.

[0015] As a preferred technical solution, the outer sleeve has two opposing set screw holes that provide mounting positions for the set screws, and the set screw holes are perpendicular to the axis of the outer sleeve.

[0016] As a preferred technical solution, the male threaded connector is right-hand threaded and matches the sucker rod column, and the thread direction of the female coupling sleeve and the outer sleeve must be compatible with the anti-derailment function.

[0017] This utility model has at least the following beneficial effects:

[0018] This application, through the linkage design of the anti-detachment component and the upper helical angle tooth, achieves the function of locking to prevent detachment when rotating clockwise and loosening for easy installation when rotating counterclockwise, thus solving the technical problem of easy detachment of sucker rods in the prior art. At the same time, when the sucker rod moves up and down, the pressure of the liquid volume drives the anti-detachment centralizer, and the rotation of the anti-detachment centralizer prevents uneven wear of the sucker rod, protecting the sucker rod, tubing and other oilfield production equipment. It solves the downhole accident caused by sucker rod breakage, saves maintenance costs, increases oil well productivity and reduces the labor intensity of workers. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This utility model Figure 1 Schematic diagram of the cross-section of the AA structure;

[0021] Figure 3 This utility model Figure 1 A schematic diagram of the cross-sectional structure of BB.

[0022] In the diagram: 100, straightening component; 110, straightening rod; 111, upper helical angle tooth; 120, nylon sleeve; 200, connecting component; 210, male threaded connector; 220, female clamp connecting sleeve; 300, anti-detachment component; 310, anti-detachment rod; 311, lower helical angle tooth; 320, pin; 330, spring; 400, outer sleeve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-3 This utility model provides a clockwise rotating sucker rod anti-detachment stabilizer, including a stabilizer component 100 for centering and reducing friction on the sucker rod and a connecting component 200 for connecting the sucker rod column. The connecting component 200 is disposed on the stabilizer component 100. The connecting component 200 has an anti-detachment component 300 for one-way locking inside. The stabilizer component 100 and the connecting component 200 are provided with an outer sleeve 400 for wrapping the anti-detachment component 300. The anti-detachment component 300 includes an anti-detachment rod 310 located in the inner cavity of the connecting component 200 and the outer sleeve 400. The anti-detachment rod 310 is provided with a pin 320 for connecting it to the connecting component 200 and restricting circumferential rotation. The inner cavity of the connecting component 200 is also provided with a spring 330. One end of the spring 330 abuts against the anti-detachment rod 310. The end of the anti-detachment rod 310 away from the spring 330 is integrally formed with a lower helical angle tooth 311. The lower helical angle tooth 311 is disposed at one end of the stabilizer component 100.

[0025] The centering assembly 100 includes a centering rod 110. A nylon sleeve 120 is fitted around the center of the surface of the centering rod 110. The bottom end of the centering rod 110 extends into the inner cavity of the outer sleeve 400 and is integrally formed with an upper helical angle tooth 111. The upper helical angle tooth 111 meshes with the lower helical angle tooth 311. When the sucker rod rotates clockwise, the upper helical angle tooth 111 and the lower helical angle tooth 311 mesh and lock. When it rotates counterclockwise, the spring 330 pushes the anti-disengagement rod 310 to separate the upper helical angle tooth 111 and the lower helical angle tooth 311, achieving one-way locking and keeping the sucker rod in a centered state in the tubing, avoiding uneven wear and vibration caused by eccentricity.

[0026] The connecting assembly 200 includes a male threaded connector 210 that is threaded onto the top of the centralizer 110 and connected to the sucker rod string. The inner cavity of the outer sleeve 400 is threaded with a female clamp connecting sleeve 220 that connects to the downhole tubing string. The anti-disengagement rod 310 and the spring 330 are both placed in the inner cavity of the female clamp connecting sleeve 220. The pin 320 is inserted between the anti-disengagement rod 310 and the female clamp connecting sleeve 220. The connecting assembly 200 can serve as an interface between the anti-disengagement centralizer and the sucker rod string and downhole tubing string. It can achieve rapid assembly through threads and ensure the structural integrity of the tool string.

[0027] Among them, a gap is formed between the top of the female clamp connecting sleeve 220 and the upper helical angle tooth 111, and the lower helical angle tooth 311 is located within the gap.

[0028] Among them, the centralizing rod 110 is a high-strength alloy steel centralizing rod with a wear-resistant surface treatment, which can prevent the centralizing rod from plastic deformation or breakage due to overload and can also avoid strength reduction due to material corrosion. The outer surface of the nylon sleeve 120 is coated with a molybdenum disulfide wear-resistant coating. When the oil rod moves up and down, the coating forms a solid lubricating film, reducing direct contact wear with the inner wall of the oil pipe, thereby reducing the coefficient of friction and reducing uneven wear. It not only meets the mechanical requirements of oilfield operations, but also improves the friction reduction performance through surface engineering technology. This is the key foundation for the anti-detachment centralizing device to achieve "long life and low maintenance".

[0029] Among them, the pin 320 is a cylindrical pin that passes through the inner hole of the female clamp connecting sleeve 220 and the pin hole of the anti-disengagement rod 310 to fix the circumferential position of the lower anti-disengagement rod 310 and form an axial limit with the female clamp connecting sleeve 220.

[0030] The outer casing 400 has two opposing top screw holes that provide mounting positions for the top screws. The top screw holes are perpendicular to the axis of the outer casing 400. The top screws on the outer casing 400 are used to fix the relative position of the outer casing 400 and the downhole tubing.

[0031] Among them, the male threaded connector 210 has a right-hand thread and is matched with the sucker rod string, while the thread direction of the female clamp connecting sleeve 220 and the outer sleeve 400 must be compatible with the anti-derailment function.

[0032] The working principle of this utility model is as follows: When the sucker rod rotates clockwise, the torque of the sucker rod is transmitted to the centering rod 110 through the male threaded connector 210, which drives the upper helical angle tooth 111 to rotate synchronously. The upper helical angle tooth 111 drives the anti-disengagement rod 310, the pin 320, and the female clamp connecting sleeve 220 to rotate through the lower helical angle tooth 311. The tooth surface of the helical angle tooth contacts the two opposing set screws on the outer sleeve 400, generating a compressive force along the normal direction of the tooth surface. The compressive force pushes the set screws to move outward of the outer sleeve 400, compressing the spring 330. The set screws are symmetrically distributed, and the upper helical angle tooth 111 and the lower helical angle tooth 311 are subjected to balanced force, avoiding uneven wear caused by unilateral force. As the spring 330 is compressed, the set screw gradually wedges into the grooves of the upper helical angle tooth 111 and the lower helical angle tooth 311. When the clockwise torque reaches the set threshold, a locking force is generated, which locks the helical angle teeth and prevents the sucker rod from continuing to rotate, thus preventing disengagement. The upper helical angle tooth 111 and the lower helical angle tooth 311 are subjected to force at the same time, forming a double anti-disengagement guarantee. Compared with the single helical angle tooth structure, it effectively improves the reliability of anti-disengagement.

[0033] When it is necessary to disassemble or adjust the sucker rod: rotate counterclockwise, the upper helical angle tooth 111 and the lower helical angle tooth 311 are disengaged from the set screw, the spring 330 releases elastic potential energy, pushes the set screw back to the initial position, releases the constraint on the helical angle tooth, the helical angle tooth is no longer restricted by the set screw, and can rotate with the straightening rod 110. At this time, only a small torque is needed to disassemble the male thread connector 210, and the tool disassembly is completed. The operation is convenient and efficient.

[0034] During the reciprocating motion of the sucker rod: the nylon sleeve 120 moves synchronously with the centralizing rod 110. The nylon sleeve 120 rotates slightly under the action of liquid pressure to ensure that the sucker rod always remains in a centered state, avoids uneven wear, and protects oilfield production equipment such as sucker rods and tubing.

[0035] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A clockwise rotating sucker rod anti-detachment and centralizing device, characterized in that, include: A centering assembly (100) for reducing friction in the oil rod and a connecting assembly (200) for connecting the sucker rod string, the connecting assembly (200) being disposed on the centering assembly (100), the connecting assembly (200) having an anti-detachment assembly (300) for one-way locking inside, and a cover (400) for wrapping the anti-detachment assembly (300) being provided between the centering assembly (100) and the connecting assembly (200), wherein: The anti-detachment component (300) includes an anti-detachment rod (310) located in the inner cavity of the connecting component (200) and the outer sleeve (400). The anti-detachment rod (310) is provided with a pin (320) for connecting it to the connecting component (200) and restricting circumferential rotation. The inner cavity of the connecting component (200) is also provided with a spring (330). One end of the spring (330) abuts against the anti-detachment rod (310). The end of the anti-detachment rod (310) away from the spring (330) is integrally formed with a lower helical angle tooth (311). The lower helical angle tooth (311) is located at one end of the straightening component (100).

2. The clockwise rotating sucker rod anti-detachment and centralizing device according to claim 1, characterized in that: The straightening assembly (100) includes a straightening rod (110), a nylon sleeve (120) is fitted on the middle of the surface of the straightening rod (110), the bottom end of the straightening rod (110) extends into the inner cavity of the outer sleeve (400) and is integrally formed with an upper helical angle tooth (111), the upper helical angle tooth (111) meshes with the lower helical angle tooth (311), when the sucker rod rotates clockwise, the upper helical angle tooth (111) meshes with the lower helical angle tooth (311) and locks; when it rotates counterclockwise, the spring (330) pushes the anti-disengagement rod (310) to separate the upper helical angle tooth (111) from the lower helical angle tooth (311) and achieve one-way locking.

3. The clockwise rotating sucker rod anti-detachment and centralizing device according to claim 2, characterized in that: The connecting assembly (200) includes a male threaded connector (210) threaded onto the top of the centralizing rod (110) and connected to the sucker rod string. The inner cavity of the outer sleeve (400) is threaded with a female clamp connecting sleeve (220) that connects to the downhole tubing string. The anti-disengagement rod (310) and the spring (330) are both placed in the inner cavity of the female clamp connecting sleeve (220). The pin (320) is inserted between the anti-disengagement rod (310) and the female clamp connecting sleeve (220).

4. The clockwise rotating sucker rod anti-detachment and centralizing device according to claim 3, characterized in that: The top end of the female clamp connecting sleeve (220) forms a gap with the upper helical angle tooth (111), which is used for the axial movement of the anti-detachment rod (310) in response to changes in the rotation direction, and the lower helical angle tooth (311) is located within the gap.

5. The clockwise rotating sucker rod anti-detachment and centralizing device according to claim 4, characterized in that: The straightening rod (110) is a high-strength alloy steel straightening rod, and the outer surface of the nylon sleeve (120) is coated with a molybdenum disulfide wear-resistant coating.

6. The clockwise rotating sucker rod anti-detachment and centralizing device according to claim 5, characterized in that: The pin (320) is a cylindrical pin that passes laterally through the inner hole of the female clamp connecting sleeve (220) and the pin hole of the anti-disengagement rod (310).

7. The clockwise rotating sucker rod anti-detachment and centralizing device according to claim 6, characterized in that: The outer sleeve (400) has two opposing set screw holes that provide mounting positions for set screws, and the set screw holes are perpendicular to the axis of the outer sleeve (400).

8. The clockwise rotating sucker rod anti-detachment and centralizing device according to claim 7, characterized in that: The male threaded connector (210) is right-hand threaded and matches the sucker rod column. The thread direction of the female clamp connecting sleeve (220) and the outer sleeve (400) must be compatible with the anti-loosening function.

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