Hydraulic pipe column anchor

Abstract

The utility model belongs to the field of oilfield exploitation, and particularly relates to a hydraulic pipe column anchor which comprises an upper connector, a lower connector and a lower central pipe, the lower connector is connected to the bottom end of the lower central pipe, the lower connector is fixedly connected with the lower central pipe, an anchor body is installed outside the lower central pipe, and the anchor body is fixedly connected with the lower central pipe. The anchor body comprises a sheath, a slip, a plate spring, an upper cone, a lower cone and a lifting and hanging pin; a pressure relief lifting and hanging mechanism is connected to the upper portion of the anchor body and comprises an upper center pipe and a lifting and hanging sleeve, and a pressure relief hole is formed in the position, close to the bottom end of the upper center pipe, of the side face of the upper cone. The lower part of the anchor body is connected with an extrusion propulsion mechanism; according to the utility model, enough anchoring force can be provided for the tubular column, jam releasing can be carried out through an auxiliary jam releasing means, and the operation is simple and convenient.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield development, and specifically relates to a hydraulic tubing anchor. Background Technology

[0002] In oilfield development, tubing string anchors are frequently used in production. A typical tubing string consists of tubing, a pump, an anchor, a packer, and auxiliary tools. Their function is to prevent the tubing string from creeping up and down during production pumping, which can lead to breakage, wear, and, more importantly, packer sleeve wear, damage, and deformation. This significantly shortens the packer's sealing life, increases maintenance workload, hinders efficient crude oil extraction, and raises production costs. Currently, the two most commonly used anchors in production are hydraulic anchors and expansion anchors. Hydraulic anchors work by applying hydraulic pressure directly to the anchor teeth, which are circular cylinders embedded in the anchor body. The hydraulic pressure compresses these cylinders against the casing wall, anchoring the tubing. However, due to the limited cross-sectional area of ​​the cylindrical cylinder, the resulting compressive force is also limited, resulting in a relatively small anchoring force. The expansion anchor is a bidirectional slip anchor for oil production. Its principle is to use the relative rotation of the threads to push the sliding sleeve forward and squeeze the conical surface of the bidirectional slip, so that the slip is firmly anchored to the casing wall. Its advantage is that the anchoring force is relatively large. Its disadvantage is that the operation is relatively complicated, and the lifting force is often too large when unsealing and unblocking, and there is a lack of auxiliary unblocking methods. Utility Model Content

[0003] The purpose of this invention is to solve the problems of large unsealing force and poor anchoring effect in the existing technology, and to provide a hydraulic pipe anchor that can provide sufficient anchoring force for the pipe and can be unsealed by auxiliary unsealing means, and is simple and convenient to operate.

[0004] The purpose of this utility model is achieved as follows: A hydraulic tube anchor includes an upper connector, a lower connector, and a lower central tube. The lower connector is connected to the bottom end of the lower central tube and is fixedly connected to the lower central tube. An anchor body is installed on the outside of the lower central tube. The anchor body includes a sleeve, a slip, a leaf spring, an upper cone, a lower cone, and a lifting pin. The upper and lower cones are sleeved on the outside of the lower central tube, and the sleeve is sleeved on the outside of the upper and lower cones. The upper cone is hooked onto the stepped surface of the inner side of the sleeve, and the lower cone is hooked onto the lifting pin on the side of the sleeve. A slot is provided on the side of the sleeve, and a slip is provided in the slot. The slip is located between the upper and lower cones. The upper and lower end faces are respectively conical structures, and the upper and lower end faces of the slip are slidably connected to the conical surfaces of the upper and lower cones, respectively. The slips are evenly distributed around the lower central tube, and a leaf spring is provided between the slips and the protective sleeve. A pressure relief lifting mechanism is connected above the anchor body. The pressure relief lifting mechanism includes an upper central tube and a lifting sleeve. The upper central tube is connected to the upper cone by a thread, and the upper central tube is fixedly connected to the upper connector. The lifting sleeve is sleeved on the outside of the upper central tube, and the lifting sleeve is fixedly connected to the upper central tube and connected to the upper cone by a thread. A pressure relief hole is provided on the side of the upper cone near the bottom of the upper central tube. A compression and propulsion mechanism is connected below the anchor body.

[0005] Furthermore, the extrusion propulsion mechanism includes a spacer, a cylinder liner, a piston, and a control pin. The spacer and piston are sleeved outside the lower central tube, and the piston is located between the spacer and the lower connector. The cylinder liner is sleeved outside the spacer and piston. The piston is hooked onto the stepped surface on the inner side of the cylinder liner, and the piston and the lower central tube are slidably connected vertically. The cylinder liner and the lower connector are connected by the control pin. A pressure relief hole is provided on the side wall of the cylinder liner.

[0006] Furthermore, the spacer sleeve and the lower central tube are fixedly connected by threads.

[0007] Furthermore, the lower connector is connected to the lower central tube by a thread.

[0008] Furthermore, the upper central tube and the upper connector are connected by threads.

[0009] Furthermore, the upper cone and the lower central tube are connected by a reverse thread.

[0010] The beneficial effects of this utility model are:

[0011] 1. This utility model adopts a bidirectional slip anchoring pipe string, providing anchoring force in both the upper and lower directions, preventing it from moving upwards or downwards. The slip is seated by a piston, and the piston's thrust can be designed appropriately according to the situation. In the working state, the pressure of the liquid column inside the pipe string pushes the piston, making the slip firmly anchored to the casing wall. The anchoring force is large, providing sufficient anchoring force to the pipe string. When unslipping, rotate the oil pipe forward to open the drain mechanism, release the pressure of the liquid column inside the pipe string, release the piston thrust, and the slip cone surface loses thrust, lifting the pipe string to retract the slip. If the lifting force for unslipping is too large, the drain channel can be closed, and pressure can be applied from inside the casing in the opposite direction to assist in unslipping.

[0012] 2. This utility model can not only eliminate the impact of tubing creep on the packer sealing performance or tubing accessories, but also has a large anchoring force and a firm and reliable anchoring, putting the tubing in a better working state, which is beneficial to pumping production and extending tubing life; at the same time, because it has a tubing pressure relief function, during the process of pulling out the tubing during construction operations, the oil in the tubing can flow back into the well through the pressure relief channel, avoiding the oil in the tubing from being discharged into the wellhead and causing pollution;

[0013] The utility model utilizes hydraulic pressure from the tubing column or a ground pump to pressurize the slips, employs bidirectional anchoring, and features forward rotation of the oil pipe for pressure relief and lifting to release the jamming. It boasts reliable performance and a simple structure. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a cross-sectional structural diagram of a hydraulic tubular anchor of this utility model.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1. Lower center tube; 2. Lower connector; 3. Upper connector; 4. Sheath; 5. Slip; 6. Leaf spring; 7. Upper cone; 8. Lower cone; 9. Lifting pin; 10. Slot; 11. Upper center tube; 12. Lifting sleeve; 13. Pressure relief hole; 14. Spacer; 15. Cylinder liner; 16. Piston; 17. Control pin. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] In one embodiment of this utility model, such as Figure 1As shown, a hydraulic tube anchor includes an upper connector 3, a lower connector 2, and a lower central tube 1. The lower connector 2 is connected to the bottom end of the lower central tube 1, and the lower connector 2 is fixedly connected to the lower central tube 1. An anchor body is installed on the outside of the lower central tube 1. The anchor body includes a sleeve 4, a slip 5, a leaf spring 6, an upper cone 7, a lower cone 8, and a lifting pin 9. The upper cone 7 and the lower cone 8 are sleeved on the outside of the lower central tube 1, and the sleeve 4 is sleeved on the outside of the upper cone 7 and the lower cone 8. The upper cone 7 is hooked onto the stepped surface of the inner side of the sleeve 4, and the lower cone 8 is hooked onto the lifting pin 9 on the side of the sleeve 4. A slot 10 is provided on the side of the sleeve 4, and a slip 5 is provided in the slot 10. The slip 5 is located between the upper cone 7 and the lower cone 8. The upper and lower end faces of the slip 5 are... Each of the anchors adopts a conical structure, and the upper and lower end faces of the slip 5 are slidably connected to the conical surfaces of the upper cone 7 and the lower cone 8, respectively. The slips 5 are evenly distributed around the lower central tube 1, and a leaf spring 6 is provided between the slips 5 and the sheath 4. A pressure relief lifting mechanism is connected above the anchor body. The pressure relief lifting mechanism includes an upper central tube 11 and a lifting sleeve 12. The upper central tube 11 is connected to the upper cone 7 by a thread, and the upper central tube 11 is fixedly connected to the upper connector 3. The lifting sleeve 12 is sleeved on the outside of the upper central tube 11, and the lifting sleeve 12 is fixedly connected to the upper central tube 11 and connected to the upper cone 7 by a thread. A pressure relief hole 13 is provided on the side of the upper cone 7 near the bottom of the upper central tube 11. A compression and pushing mechanism is connected below the anchor body.

[0024] In one embodiment of this utility model, such as Figure 1 As shown, the extrusion propulsion mechanism includes a spacer 14, a cylinder liner 15, a piston 16, and a control pin 17. The spacer 14 and the piston 16 are sleeved on the outside of the lower central tube 1, and the piston 16 is located between the spacer 14 and the lower connector 2. The cylinder liner 15 is sleeved on the outside of the spacer 14 and the piston 16. The piston 16 is hooked on the stepped surface on the inner side of the cylinder liner 15, and the piston 16 is slidably connected to the lower central tube 1. The cylinder liner 15 is connected to the lower connector 2 by the control pin 17. A pressure relief hole is provided on the side wall of the cylinder liner 15.

[0025] In one embodiment of this utility model, such as Figure 1As shown, a hydraulic tube anchor includes a hydraulic seat structure and an oil drain and lifting mechanism. The hydraulic seat mechanism includes a lower connector 2, a lower central tube 1, a piston 16, a control pin 17, a cylinder liner 15, a spacer 14, a lower cone 8, a protective sleeve 4, a leaf spring 6, a slip 5, an upper cone 7, and a lifting pin 9. The lower central tube 1 is cylindrical, with external threads and two hydraulic seat channels at the upper, middle, and lower parts. The lower connector 2 is stepped inside and out, with threads on the inner step. The upper cone 7 has inner and outer walls that are... The structure is a cylindrical stepped structure with a conical lower end and an oil drain channel in the middle. The inner step of the upper cone 7 has upper and lower threads, and the upper end of the outer step has an external thread. The upper thread of the inner step of the upper cone 7 is a reverse thread. The lower end of the lower center tube 1 is connected to the inner step thread of the lower connector 2. The upper end of the lower center tube 1 is connected to the lower end thread of the inner step of the upper cone 7. The hydraulic locking mechanism is located around the upper cone 7, the lower center tube 1, and the lower connector 2. The sleeve 14 is provided with internal threads, which are connected to the middle thread of the lower central tube 1. The piston 16 is cylindrical and is sleeved around the lower central tube 1, located between the lower end face of the sleeve 14 and the upper end face of the lower connector 2. The lower cone 8 is cylindrical and stepped inside and out, with a conical surface at the upper end and threads on the outer step at the lower end. The cylinder liner 15 is cylindrical with steps on the inner circle, threads on the upper step, a pressure relief hole on the middle step, and a pin threaded hole on the lower step. The lower cone 8 has an inner platform... The lower cone 8 is fitted onto the lower central tube 1. The lower end of the lower cone 8 is connected to the upper step of the cylinder liner 15 by the threaded connection. The cylinder liner 15 is fitted onto the lower cone 8, the spacer 14, the piston 16, and the lower connector 2. The upper end face of the piston 16 is engaged on the middle step of the cylinder liner 15, and the lower end face is supported on the upper end face of the lower connector 2. The front end of the control pin 17 is inserted into the outer step of the lower connector 2 and is connected to the threaded hole of the cylinder liner 15 by threads. The sheath 4 has a cylindrical step inside its upper end, eight slots 10 for placing the slips 5 in the middle, and a threaded hole for the pin at the lower end. The sheath 4 is hooked onto the outer step of the upper cone 7 through the inner step. The upper and lower end faces of the bidirectional slips 5 are conical, with a groove in the middle, and are placed in the slots 10 in the middle of the sheath 4. The upper conical surface of the bidirectional slips 5 is close to the conical surface of the upper cone 7. There is a partition between the slots 10 in the middle of the sheath 4. The leaf spring 6 is placed between the partition and the groove in the middle of the bidirectional slips 5. The lower cone 8 is located inside the sheath 4, and the conical surface of the lower cone 8 is close to the lower conical surface of the bidirectional slips 5. The lower cone 8 has a stepped groove on its outer side. The front end of the lifting pin 9 is inserted into the stepped groove on the outer side of the lower cone 8 to hook the sheath 4 and the lower cone 8 together.

[0026] The oil draining and lifting mechanism includes an upper connector 3, an upper central tube 11, and a lifting sleeve 12. The upper central tube 11 is cylindrical with a stepped outer surface. It has an external thread at the upper end and a reverse external thread at the middle step. The upper central tube 11 is connected to the upper end of the upper cone 7 via the reverse external thread at the middle step. The inner wall of the lifting sleeve 12 has steps of varying sizes. The inner wall of the larger diameter step has an internal thread. The lifting sleeve 12 is fitted around the upper central tube 11. The threads on the inner wall of the lifting sleeve 12 are connected to the external threads at the upper end of the upper cone 7. The upper connector 3 has upper and lower threads on its inner wall and is connected to the upper central tube 11 via the lower thread on its inner wall.

[0027] This invention employs a bidirectional slip 5 to anchor the tubing string. The slip 5 is secured by a piston 16, the force of which can be designed appropriately. During operation, the hydraulic pressure inside the tubing pushes the piston 16, firmly anchoring the slip 5 to the casing wall. The strong anchoring force provides sufficient anchoring power. To release the slip, the tubing is rotated clockwise to open the drain mechanism, releasing the hydraulic pressure inside the tubing and disengaging the piston 16. The slip 5's conical surface loses thrust, allowing the tubing string to be lifted to retrieve the slip. If excessive lifting force occurs during release, the drain channel can be closed, and pressure can be applied from inside the casing in the opposite direction to assist in release. The tubing also features a pressure relief function; during tubing retrieval, oil inside the tubing can flow back into the well through the pressure relief holes 13, preventing oil from leaking into the wellhead and causing contamination.

[0028] The implementation process includes the following steps:

[0029] The first step is to connect the hydraulic tubing anchor, oil pump, packer and other supporting tools together according to production needs. For example, the connection sequence is: tubing + oil pump + tubing + a hydraulic tubing anchor + tubing + packer, etc., and then use the tubing to send the hydraulic tubing anchor and other equipment to the oil well production design position.

[0030] The second step involves connecting the ground cement truck and other pumping equipment to the tubing column according to design requirements. Water pressure is injected into the tubing column to set and lock the hydraulic tubing anchor, packer, etc. Water pressure enters the piston chamber through the water inlet channels on the tubing column, upper connector 3, and lower center pipe 1, pushing piston 16 and lower cone 8 forward. The thrust of piston 16 and lower cone 8 is transmitted directly or indirectly to control pin 17 through cylinder liner 15, shearing control pin 17. Piston 16 and lower cone 8 continue to move forward, pushing slip 5 to bulge outward along the conical surfaces of upper and lower cone 8, and then tightly adhering to the casing wall. As the pressure increases, slip 5 is firmly anchored to the casing wall. Afterward, the setting and pressing equipment is removed, and the inner cavity of the oil pipe is filled with liquid column. Under the action of liquid column pressure, the thrust of piston 16 and upper cone 7 always keeps slip 5 anchored to the casing wall, completing the anchoring process.

[0031] Thirdly, during the production process, the tubing is always filled with oil. The oil column generates pressure, squeezing the piston 16 and the upper cone 7, so that the slip 5 is firmly anchored to the casing wall, thus anchoring the tubing. In addition, when the lower matching packer is subjected to downward thrust, this force is transmitted through the packer and the oil pipe to the lower connector 2, the central pipe, and the upper cone 7 of a hydraulic tubing anchor. The upper cone 7 squeezes the slip 5 through its conical surface, so that the slip 5 is firmly anchored to the casing. When the lower matching packer is subjected to upward thrust, this force is transmitted to the oil pipe and the lower cone 8 of a hydraulic tubing anchor, thus firmly anchoring the slip 5 to the casing. The oil pipe support force and the slip 5 anchoring force prevent the packer from moving.

[0032] Fourthly, after a period of production, when the production tubing needs to be retrieved, the wellhead is removed, and the tubing is rotated clockwise. The rotational torque is transmitted through the tubing to the upper connector 3 and the upper central tube 11 of a hydraulic tubing anchor. The upper central tube 11 rotates relative to the upper cone 7. Under the action of the reverse thread, the upper central tube 11 moves upward relative to the upper cone 7, opening the pressure relief hole 13. At this time, the inside and outside of the tubing are connected, and the fluid inside the tubing flows out, eliminating the pressure generated by the fluid column inside the tubing. The squeezing force of the piston 16 and the upper cone 7 on the slips 5 is eliminated. After stopping the rotation of the tubing, the tubing is lifted. The lifting force of the tubing is transmitted through the upper connector 3 and the upper central tube 11 to the lifting sleeve 12, the upper cone 7, and the sheath 4, forcing the slips 5 to retract, thus realizing the release action.

[0033] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A hydraulic tubular anchor, comprising an upper connector (3), a lower connector (2), and a lower central tube (1), wherein the lower connector (2) is connected to the bottom end of the lower central tube (1), the lower connector (2) and the lower central tube (1) are fixedly connected, and an anchor body is installed on the outside of the lower central tube (1), characterized in that: The anchor body includes a sleeve (4), a slip (5), a leaf spring (6), an upper cone (7), a lower cone (8), and a lifting pin (9). The upper cone (7) and the lower cone (8) are fitted outside the lower central tube (1). The sleeve (4) is fitted outside the upper cone (7) and the lower cone (8). The upper cone (7) is hooked onto the stepped surface on the inner side of the sleeve (4), and the lower cone (8) is hooked onto the lifting pin (9) on the side of the sleeve (4). 4) has a slot (10) on its side, and a slip (5) is provided in the slot (10). The slip (5) is located between the upper cone (7) and the lower cone (8). The upper and lower end faces of the slip (5) are respectively conical, and the upper and lower end faces of the slip (5) are slidably connected to the conical surfaces of the upper cone (7) and the lower cone (8). The slip (5) is evenly distributed around the lower central tube (1). A leaf spring (6) is provided between the slip (5) and the sheath (4). A pressure relief lifting mechanism is connected above the anchor body. The pressure relief lifting mechanism includes an upper central tube (11) and a lifting sleeve (12). The upper central tube (11) is connected to the upper cone (7) by a thread. The upper central tube (11) is fixedly connected to the upper connector (3). The lifting sleeve (12) is sleeved on the outside of the upper central tube (11). The lifting sleeve (12) is fixedly connected to the upper central tube (11) and connected to the upper cone (7) by a thread. A pressure relief hole (13) is provided on the side of the upper cone (7) near the bottom of the upper central tube (11). A compression and propulsion mechanism is connected below the anchor body.

2. The hydraulic tubing anchor as described in claim 1, characterized in that: The extrusion propulsion mechanism includes a spacer (14), a cylinder liner (15), a piston (16), and a control pin (17). The spacer (14) and the piston (16) are sleeved on the outside of the lower central tube (1), and the piston (16) is located between the spacer (14) and the lower connector (2). The cylinder liner (15) is sleeved on the outside of the spacer (14) and the piston (16). The piston (16) is hooked on the stepped surface on the inner side of the cylinder liner (15), and the piston (16) is slidably connected to the lower central tube (1). The cylinder liner (15) and the lower connector (2) are connected by the control pin (17). A pressure relief hole is provided on the side wall of the cylinder liner (15).

3. A hydraulic tubing anchor as described in claim 2, characterized in that: The spacer (14) and the lower center tube (1) are fixedly connected by threads.

4. A hydraulic tubing anchor as described in claim 1, characterized in that: The lower connector (2) is connected to the lower central tube (1) by a thread.

5. A hydraulic tubing anchor as described in claim 1, characterized in that: The upper central tube (11) and the upper connector (3) are connected by threads.

6. A hydraulic tubing anchor as described in claim 1, characterized in that: The upper cone (7) and the lower central tube (1) are connected by a reverse thread.

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