A large-diameter hydraulic anchor for cables

Abstract

This invention proposes a large-diameter hydraulic anchor for cable passage, belonging to the technical field of oil extraction equipment. It solves the problems of small diameter, susceptibility to sand blockage, and incomplete cable passage function of existing hydraulic anchors. It includes a main body, a pressure plate, several anchor claws, several springs, a sand-prevention mechanism, a cable passage mechanism, and a sealing ring. The main body has a central channel for pipe string passage, and several grooves extending through the maximum outer diameter of the main body. The cable passage mechanism is installed in these grooves. Several anchor claws with grooved structures are installed circumferentially around the central channel of the main body. Springs are installed within these grooves, and the pressure plate is mounted on the grooved structures. Springs are installed between the anchor claws and the pressure plate. A sealing ring is installed on each anchor claw. The sand-prevention mechanism is installed inside the main body. The large-diameter hydraulic anchor for cable passage described in this invention has advantages such as large diameter, good sand-prevention effect, and complete cable passage function, effectively solving the problems of existing hydraulic anchors and improving the production efficiency and safety of oil wells.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum extraction equipment technology, specifically relating to a key device for fixing downhole tubing in the process of oil and gas well development, and particularly to a large-diameter hydraulic anchor for cable. Background Technology

[0002] With the continuous development of the petroleum industry, the requirements for oil and gas well extraction efficiency and safety are becoming increasingly stringent. In complex downhole environments, various high-performance equipment is needed to ensure the smooth progress of extraction operations. Hydraulic anchors, as one of the important pieces of equipment in oil extraction, play a crucial role in securing the downhole tubing. During oil extraction, hydraulic anchors are a commonly used downhole tool used to fix the tubing and prevent it from moving during operations; their performance directly affects the production stability and safety of oil and gas wells.

[0003] Currently, with the increasing depth of oil and gas well extraction, the increasing complexity of geological conditions, and the pursuit of high production and efficiency, traditional hydraulic anchors are gradually showing their shortcomings in many aspects. For example, a small diameter can restrict the flow of oil and gas, reducing production; poor sand control can lead to sand particles entering the hydraulic anchor, damaging key components and affecting the service life and reliability of the equipment; and inadequate cable passage functionality can damage the cable, affecting data transmission and downhole monitoring. Therefore, developing a large-diameter hydraulic anchor with good sand control and complete cable passage functionality is of great practical significance for improving the efficiency and safety of oil extraction. Utility Model Content

[0004] In view of this, and in order to solve the problems of existing hydraulic anchors having small diameters, being easily blocked by sand particles, and having imperfect cable passage functions, this utility model proposes a large-diameter hydraulic anchor for cable passage.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a large-diameter hydraulic anchor for passing cables, comprising a main body, a pressure plate, several anchor claws, several springs, a sand-proof mechanism, a cable-passing mechanism, and a sealing ring. The main body has a central channel inside for passing a pipe column, and several grooves on the outside, penetrating the maximum outer diameter of the main body. The cable-passing mechanism is installed on the grooves. Several anchor claws are installed circumferentially on the central channel of the main body. The anchor claws are groove structures, and springs are installed inside the groove structures. The pressure plate is installed on the groove structures. Springs are installed between the anchor claws and the pressure plate. A sealing ring is installed on the anchor claws. The sand-proof mechanism is installed inside the main body.

[0006] Furthermore, the cable-carrying mechanism includes a cover plate and a first fixing screw. The cover plate is fixed to the groove of the main body by the first fixing screw, and the cable is placed in the groove.

[0007] Furthermore, the main body is made of 40Cr material.

[0008] Furthermore, the outer diameter of the main body is determined according to the specifications of the oil well.

[0009] Furthermore, the diameter of the central channel of the main body is φ50mm or φ60mm, and the length of the main body is 360mm.

[0010] Furthermore, the groove depth of the main body is 13mm.

[0011] Furthermore, the anchor claw is made of 20CrMnTi alloy material.

[0012] Furthermore, the spring is made of 60Si2Mn material.

[0013] Furthermore, the sand-proof mechanism is made of 45# steel.

[0014] Furthermore, the sand-proof mechanism includes a liner and a fixing sleeve. The liner is installed inside the main body, and the fixing sleeve is fixed to the outside of the liner. Four 0.3mm wide liquid channels are evenly distributed along the axial direction on the liner.

[0015] Compared with the prior art, the beneficial effects of the large-diameter hydraulic anchor for cables described in this utility model are:

[0016] 1. The large-diameter hydraulic anchor for cable passage described in this utility model has advantages such as large diameter, good sand control effect, and complete cable passage function. It can effectively solve the problems existing in the existing hydraulic anchor and improve the production efficiency and safety of oil wells.

[0017] 2. The large-diameter hydraulic anchor structure for cable described in this utility model is simple, easy to install, and highly reliable, and is suitable for various types of oil wells. Attached Figure Description

[0018] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0019] Figure 1 is a structural schematic diagram of the large-diameter hydraulic anchor for cable passing through according to this utility model;

[0020] Figure 2 is a partial enlarged view of the anchor claw and sealing structure of the large-diameter hydraulic anchor for cable passing according to this utility model;

[0021] Figure 3 is a schematic diagram of the sand-proof structure of the large-diameter hydraulic anchor for cable passing through according to this utility model;

[0022] Figure 4 is a schematic diagram of the cable-passing structure of the large-diameter hydraulic anchor for passing cables according to this utility model.

[0023] Figure 5 shows the usage status of the large-diameter hydraulic anchor for cable passing through according to this utility model;

[0024] Figure 6 is a front sectional view of the anchor claw described in this utility model;

[0025] Figure 7 is a right sectional view of the anchor claw described in this utility model;

[0026] In the diagram: 1-Main body, 2-Pressure plate, 3-Anchor claw, 4-Spring, 5-Liner, 6-Fixing sleeve, 7-Cover plate, 8-Fixing screw No. 1, 9-Fixing screw No. 2, 10-Sealing ring, 11-Central channel, 12-Cable. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0028] See Figure 1-7 This embodiment describes a large-diameter hydraulic anchor for cable passage, comprising a main body 1, a pressure plate 2, anchor claws 3, a spring 4, a sand-proof mechanism (liner 5, fixing sleeve 6), a cable passage mechanism (cover plate 7), and a sealing ring 10. The main body 1 is cylindrical (larger in the middle and smaller at both ends) with an internal central channel 11 for the passage of tubing. An external groove extends through the maximum outer diameter of the main body 1, and the cover plate 7, mounted on the groove, protects the cable 12 passing through the main body 1. Several anchor claws 3 are circumferentially mounted on the central channel 11 of the main body 1. Each anchor claw 3 has a groove structure, within which a spring 4 is installed. The pressure plate 2 is mounted on the groove structure, and the spring 4 is installed between the anchor claw 3 and the pressure plate 2 to reset the anchor claw 3. Under the force of the spring 4, the top of the anchor claw 3 can extend beyond the pressure plate 2 and contact the inner wall of the well casing to achieve anchoring. The sealing ring 10 is on the anchor claw 3, used to achieve external expansion of the anchor claw 3 to anchor the tubing and seal the central channel 11.

[0029] The main body 1 is made of 40Cr material, which has good wear resistance and corrosion resistance. The outer diameter of the main body 1 is determined according to the specifications of the oil well; commonly used oil well pipeline specifications are φ73mm and φ89mm. The length of the main body 1 is 360mm. The central channel 11 of the main body 1 has a larger diameter, generally φ50mm or φ60mm, to ensure the passage of the tubing string. A groove with a specification of 13mm is designed on the outer side of the main body 1, extending through the maximum outer diameter of the anchor body, to ensure the smooth passage of the cable 12. The connecting threads at both ends of the main body 1 are tubing threads for connecting with other downhole tools.

[0030] The anchor claws 3 are made of 20CrMnTi alloy material, which has good wear resistance, toughness, and corrosion resistance. There are generally six anchor claws 3, arranged in two concentric circles, with three evenly distributed around the circumference of the main body 1. The anchor claws 3 are arc-shaped and fit into the inner wall of the oil well casing (the steel pipe protecting the wellbore during drilling; large-diameter hydraulic anchors for cables operate on the inner wall of the casing). Figure 5 As shown, to ensure the reliability of anchoring. The outer structure of the anchor claw 3 is toothed to increase the friction with the inner wall of the casing. The inner structure of the anchor claw 3 is a groove for installing the spring 4. A sealing groove is machined axially on the anchor claw 3, usually one sealing groove, for installing the sealing ring 10. This seals the anchor claw 3 with the main body 1. When pressure is applied inside the pipe column, the anchor claw 3 expands outward to achieve anchoring.

[0031] The anchor claw 3 is press-fitted to the hole on the main body 1 using an O-ring seal 10. When the internal liquid pressure of the main body 1 increases, the anchor claw 3, the O-ring seal 10, and the main body 1 form a complete piston mechanism. The increased hydraulic pressure pushes the anchor claw 3 outward in the circumferential direction. Since the pressure plate 2 is fixed to the main body 1 by the second fixing screw 9, it acts as a limit. At this time, the anchor claw 3 compresses the spring 4. After the internal pressure of the main body 1 is relieved, the anchor claw 3 retracts into the main body 1 by the elastic force of the spring 4.

[0032] The springs 4 are made of 60Si2Mn material, which has good elasticity and corrosion resistance. The number of springs 4 is the same as the number of anchor claws 3. The springs 4 are located between the anchor claws 3 and the pressure plate 2, which is threaded onto the main body 1 using No. 2 fixing screws 9. The function of the springs 4 is to keep the anchor claws 3 in a contracted state when no external force is applied. When the pressure inside the main body 1 increases, the springs 4 are compressed, and the anchor claws 3 extend outward, contacting the inner wall of the oil well casing to achieve anchoring. When the pressure inside the main body 1 decreases, the springs 4 return to their original state, the anchor claws 3 retract, and the anchoring is released.

[0033] The sand-proof mechanism is made of 45# steel, which has good mechanical properties and wear resistance. The sand-proof mechanism consists of a liner 5 and a fixing sleeve 6. The liner 5 is installed inside the main body 1 (the right end is threaded, and the left end face contacts the internal limiting end face of the main body 1). The fixing sleeve 6 is fixed to the outside of the liner 5. There are four 0.3mm wide liquid channels evenly distributed along the axial direction on the liner 5 to prevent sand particles from damaging the sealing ring 10 between the main body 1 and the anchor claw 3, which would prevent the anchor from being unable to be anchored and the anchor claw 3 from contracting and the spring 4 from being stuck due to sand accumulation, thus preventing the anchor from being released.

[0034] The installation method of the large-diameter hydraulic anchor for cables described in this utility model is as follows:

[0035] (1) Install the sealing ring 10 on the anchor claw 3 and apply grease;

[0036] (2) Install the anchor claw 3 on the main body 1 to ensure that the anchor claw 3 can rotate freely;

[0037] (3) Install the spring 4 between the anchor claw 3 and the pressure plate 2 to ensure that the spring 4 can reset the anchor claw 3. The pressure plate 2 is pressed on the anchor claw 3 and installed on the main body 1 by the second fixing screw 9. The cover plate 7 is installed on the cable groove on the main body 1.

[0038] (4) Install the sand-proof mechanism (liner 5 and fixing sleeve 6) inside the main body 1.

[0039] The method of using the large-diameter hydraulic anchor for cable crossing described in this utility model is as follows:

[0040] (1) When it is necessary to fix the tubing string, high-pressure liquid is injected into the tubing string to increase the pressure inside the main body 1. When the pressure rises to a certain level, the spring 4 is compressed, the anchor claw 3 extends outward and contacts the inner wall of the oil well casing to achieve anchoring.

[0041] (2) When it is necessary to release the anchor, reduce the pressure inside the pipe column to reduce the pressure inside the main body 1. When the pressure is reduced to a certain level, the spring 4 returns to its original state, the anchor claw 3 retracts, and the anchor is released.

[0042] During use, the sealing ring 10 effectively prevents sand particles from entering the central channel 11, protecting the tubing and cables from damage. Simultaneously, the cable 12 can smoothly pass through the cable hole formed by the main body 1 and the cover plate 7, thus enabling cable passage.

[0043] During the processing and assembly of this utility model, the operation must be strictly carried out in accordance with the design requirements to ensure the quality and performance of the hydraulic anchor.

[0044] During use, the working status of the hydraulic anchor should be checked regularly to promptly identify and address any problems.

[0045] When disassembling the hydraulic anchor, this invention requires careful handling to avoid damaging the pipe column and cable.

[0046] The embodiments of the present invention disclosed above are merely illustrative of the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A hydraulic anchor for large-diameter cables, characterized in that: The device includes a main body (1), a pressure plate (2), several anchor claws (3), several springs (4), a sand-proof mechanism, a cable-passing mechanism, and a sealing ring (10). The main body (1) has a central channel (11) inside for passing through a pipe column, and several grooves on the outside, which penetrate the maximum outer diameter of the main body (1). A cable-passing mechanism is installed on the grooves. Several anchor claws (3) are installed circumferentially on the central channel (11) of the main body (1). The anchor claws (3) are groove structures, and springs (4) are installed inside the groove structures. The pressure plate (2) is installed on the groove structure. Springs (4) are installed between the anchor claws (3) and the pressure plate (2). A sealing ring (10) is installed on the anchor claws (3). A sand-proof mechanism is installed inside the main body (1).

2. The hydraulic anchor for large-diameter cables according to claim 1, characterized in that: The cable-carrying mechanism includes a cover plate (7) and a first fixing screw (8). The cover plate (7) is fixed to the groove of the main body (1) by the first fixing screw (8), and the cable (12) is placed in the groove.

3. The hydraulic anchor for large-diameter cables according to claim 1, characterized in that: The main body (1) is made of 40Cr material.

4. The hydraulic anchor for large-diameter cables according to claim 1, characterized in that: The outer diameter of the main body (1) is determined according to the specifications of the oil well.

5. The hydraulic anchor for large-diameter cables according to claim 1, characterized in that: The diameter of the central channel (11) of the main body (1) is φ50mm or φ60mm, and the length of the main body (1) is 360mm.

6. The large-diameter hydraulic anchor for cable passage according to claim 1, characterized in that: The groove depth of the main body (1) is 13mm.

7. The hydraulic anchor for large-diameter cables according to claim 1, characterized in that: The anchor claw (3) is made of 20CrMnTi alloy material.

8. The large-diameter hydraulic anchor for cable passage according to claim 1, characterized in that: The spring (4) is made of 60Si2Mn material.

9. The large-diameter hydraulic anchor for cable passage according to claim 1, characterized in that: The sand-proof mechanism is made of 45# steel.

10. The large-diameter hydraulic anchor for cable passage according to claim 9, characterized in that: The sand-proof mechanism includes a liner (5) and a fixing sleeve (6). The liner (5) is installed inside the main body (1), and the fixing sleeve (6) is fixed on the outside of the liner (5). Four liquid channels with a width of 0.3 mm are evenly distributed along the axial direction on the liner (5).

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