Hydraulic anchor

Abstract

The utility model discloses a hydraulic anchor, include: the body middle part side wall is equipped with radial anchor tooth hole, its inside installation has the anchor tooth, the anchor tooth outside is provided with the centralizer, is installed between the anchor tooth and the centralizer spring piece, the body inner chamber is equipped with the central tube, the body bottom end inner wall is connected with the lower joint of screw thread, the sliding joint of the body top and central tube has the deblocking pipe, the deblocking pipe top is connected with the upper joint of screw thread, the lower joint inside is equipped with the pressurized anchoring liquid channel, and it is one -way channel, and the central tube top is equipped with the pressure -relief deblocking liquid channel, and the pressure -relief deblocking liquid channel maintains the normally closed state, and when lifting the deblocking pipe, the pressure -relief deblocking liquid channel opens, and the body resets after pressure relief. The utility model discloses through setting up pressurized anchoring liquid channel and pressure -relief deblocking liquid channel, and the anchor tooth is anchored through pressurized anchoring liquid channel when hitting hydraulic pressure, and does not deblock after pressure relief, after lifting the pipe column, the pressure -relief deblocking liquid channel opens, and the anchor tooth deblocks, and the body resets after deblocking, realizes the repeated anchoring, deblocking in the pit.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, and in particular to a hydraulic anchor. Background Technology

[0002] Hydraulic anchors are common downhole tools used in oilfield well operations to fix the tubing string and prevent displacement. In field applications, hydraulic anchors are connected to the tubing string, with packers or water distributors at the bottom. When a pressurized fluid is injected into the tubing, the high-pressure fluid pushes the anchor teeth out and engage with the inner wall of the casing, thus anchoring the tubing string. However, existing hydraulic anchors cannot be repeatedly anchored and unanchored downhole if they only anchor during hydraulic pressure injection and then release the anchor after depressurization, or if they do not release the anchor after depressurization. Utility Model Content

[0003] The purpose of this utility model is to provide a hydraulic anchoring device. By setting up a pressurized anchoring fluid channel and a depressurized unanchoring fluid channel, when hydraulic pressure is applied, the anchor teeth are pushed to anchor through the pressurized anchoring fluid channel, and the anchor does not unanchor after depressurization. After the tubing string is lifted, the depressurized unanchoring fluid channel opens, the anchor teeth are unanchored, and after unanchoring, the upper pressure spring pushes the body to reset, realizing repeated anchoring and unanchoring downhole.

[0004] To achieve the purpose of this utility model, a hydraulic anchor is provided, comprising: a body having a through-hole structure; a radial anchor tooth hole being formed in the middle sidewall of the body; an anchor tooth being installed in the radial anchor tooth hole; the anchor tooth being circular and adapted to fit the radial anchor tooth hole; an annular sealing ring being installed on the side end of the anchor tooth; a straightening body being provided on the outside of the anchor tooth; the two ends of the straightening body being respectively limited and connected to the body by an upper retaining ring and a lower retaining ring; a spring plate being installed between the anchor tooth and the straightening body; a central tube being sleeved in the inner cavity of the body; a lower connector being threadedly connected to the inner wall of the bottom end of the body; the inner wall of the lower connector being threadedly connected to the outer wall of the central tube; and the top end of the body being connected to the central tube. A release tube is slidably connected to the body, and a pressure cap is sleeved on the outside of the release tube. The pressure cap is threadedly connected to the body and limits the sliding movement of the release tube. An upper connector is threadedly connected to the top of the release tube. A pressurized anchoring liquid channel is opened on the inner side of the lower connector, which connects the central tube and the radial anchor tooth hole and is a one-way flow channel. A pressure relief anchoring liquid channel is opened at the top of the central tube, which connects the radial anchor tooth hole and the outside of the body. An upper pressure spring is installed at the bottom of the pressure cap. The upper pressure spring presses against the release tube to keep the pressure relief anchoring liquid channel normally closed. When the release tube is lifted, the pressure relief anchoring liquid channel opens, and the radial anchor tooth hole connects to the outside of the body. After pressure relief, the upper pressure spring pushes the body to reset.

[0005] As a preferred embodiment of this utility model, the radial anchor holes are arranged in three rows, with the three rows of radial anchor holes arranged longitudinally.

[0006] As a preferred technical solution of this utility model, the cross section of the anchor tooth is designed as a U-shape, the protrusions on both sides of the anchor tooth are tooth tips, the groove in the middle of the anchor tooth faces the straightening body, the spring sheet is installed between the groove in the middle of the anchor tooth and the straightening body, and the tooth tips extend from both sides of the straightening body.

[0007] As a preferred embodiment of this utility model, a convex ring is fixedly connected to the outer wall of the unsealing tube, the pressure cap slides and limits the convex ring, and the upper pressure spring is installed between the pressure cap and the convex ring.

[0008] As a preferred embodiment of this utility model, the pressurized anchoring fluid channel includes a lower through hole, a central tube and a lower connector annulus, and a central tube and a body annulus. The lower through hole is radially opened on the outer wall of the central tube and connects the central tube and the lower connector annulus. A conical seat is provided at the bottom end of the central tube and the lower connector annulus. A conical piston is installed inside the conical seat. The conical piston cooperates with the conical seat to achieve a conical surface seal. A lower pressure spring is installed inside the central tube and the lower connector annulus. The lower pressure spring presses against the top end of the conical piston. The central tube and the lower connector annulus are connected to the bottom end of the radial anchor tooth hole through the central tube and the body annulus.

[0009] As a preferred embodiment of this utility model, the inner wall of the top end of the central tube is threadedly connected to an inner tube, the middle part of the inner tube is a small diameter section, and the small diameter section of the inner tube and the inner wall of the central tube form an annular cavity.

[0010] As a preferred technical solution of this utility model, the pressure relief and anchor release channel includes a central tube and a body annulus, a central through hole, an inner tube and a central tube annulus cavity, an upper through hole, an unsealing tube and a body annulus, an annulus between the unsealing tube and the pressure cap, and the outside of the body. The central through hole is radially opened on the outer wall of the central tube and connects the central tube and the body annulus and the inner tube and the central tube annulus cavity. The upper through hole is radially opened on the outer wall of the central tube and connects the inner tube and the central tube annulus cavity and the unsealing tube and the body annulus. The unsealing tube and the body annulus are connected to the outside of the body through the annulus between the unsealing tube and the pressure cap.

[0011] As a preferred embodiment of this utility model, the upper pressure spring presses against the unsealing tube, the unsealing tube closes the upper through hole, and the closure of the upper through hole maintains the normally closed state of the pressure relief and anchor release fluid channel.

[0012] Compared with the prior art, the present invention provides a hydraulic anchor with the following advantages:

[0013] This invention features a pressurized anchoring fluid channel and a depressurized unanchoring fluid channel. When hydraulic pressure is applied, the anchor teeth are anchored by the pressurized anchoring fluid channel, and the anchoring is not released after depressurization. After the tubing string is lifted, the depressurized unanchoring fluid channel opens, the anchor teeth are released, and the upper pressure spring pushes the main body to reset after the anchoring is released, thus enabling repeated anchoring and unanchoring downhole.

[0014] When hydraulic pressure is applied from the central tube, the hydraulic pressure acts on the conical piston through the lower through-hole of the central tube, the annulus between the central tube and the lower connector, overcoming the tension of the lower pressure spring. The conical piston moves axially, and the hydraulic pressure enters the radial anchor tooth hole cavity through the central tube and the body annulus, pushing the bottom end of the anchor tooth, causing the anchor tooth to overcome the elastic force of the spring plate and anchor outward to the inner wall of the casing. When the oil pipe pressure is released, the conical piston closes under the tension of the lower pressure spring, and the anchor tooth remains in the extended anchored state. When the anchor is released, the upper tubing string moves the release tube upward relative to the central tube. When the lower end of the release tube moves past the seal below the upper through-hole, the hydraulic pressure leaks out from the annulus between the central tube and the body, the central through-hole, the annulus between the inner tube and the central tube, the upper through-hole, the annulus between the release tube and the body, and the annulus between the release tube and the pressure cap to the outside of the body. The pressure is released, and the anchor tooth retracts under the elastic force of the spring plate, completing the anchor release. After the anchor is released, under the action of the upper compression spring, the pressure cap, body and accessories, lower connector, central tube, etc. move upward, and finally the lower end of the unsealing tube moves downward through the lower part of the upper through hole and the sealing tool returns to the initial state. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic cross-sectional view of the anchor tooth of this utility model.

[0017] 1 is the main body, 2 is the anchor tooth, 3 is the straightening body, 4 is the upper retaining ring, 5 is the lower retaining ring, 6 is the spring plate, 7 is the central tube, 8 is the lower connector, 9 is the unsealing tube, 10 is the pressure cap, 11 is the convex ring, 12 is the upper connector, 13 is the upper pressure spring, 14 is the lower through hole, 15 is the conical piston, 16 is the lower pressure spring, 17 is the inner tube, 18 is the central through hole, and 19 is the upper through hole. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-2This utility model provides a hydraulic anchor, comprising: a body 1, the body 1 having a through-hole structure, a radial anchor tooth hole formed in the middle side wall of the body 1, an anchor tooth 2 installed in the radial anchor tooth hole, a straightening body 3 disposed outside the anchor tooth 2, the two ends of the straightening body 3 being respectively limited and connected to the body 1 by an upper retaining ring 4 and a lower retaining ring 5, a spring plate 6 installed between the anchor tooth 2 and the straightening body 3, a central tube 7 sleeved in the inner cavity of the body 1, a lower connector 8 threadedly connected to the inner wall of the bottom end of the body 1, the inner wall of the lower connector 8 being threadedly connected to the outer wall of the central tube 7, a release tube 9 slidably connected between the top end of the body 1 and the central tube 7, and a pressure cap 1 sleeved on the outer side of the release tube 9. 0. The pressure cap 10 is threadedly connected to the body 1. The pressure cap 10 slides and limits the unsealing tube 9. The top end of the unsealing tube 9 is threadedly connected to the upper connector 12. The lower connector 8 has a pressurized anchoring liquid channel on its inner side, which connects the central tube 7 and the radial anchor tooth hole and is a one-way flow channel. The top end of the central tube 7 has a pressure relief unsealing liquid channel, which connects the radial anchor tooth hole and the outside of the body 1. The bottom end of the pressure cap 10 is equipped with an upper pressure spring 13. The upper pressure spring 13 presses against the unsealing tube 9 to maintain the pressure relief unsealing liquid channel in a normally closed state. When the unsealing tube 9 is lifted, the pressure relief unsealing liquid channel opens, and the radial anchor tooth hole connects to the outside of the body 1. After depressurization, the upper pressure spring 13 pushes the body 1 to reset.

[0020] In one embodiment of this utility model, the radial anchor holes are arranged in three rows, and the three rows of radial anchor holes are arranged longitudinally.

[0021] In one embodiment of this utility model, the cross section of the anchor tooth 2 is designed as a concave structure, the protrusions on both sides of the anchor tooth 2 are tooth tips, the groove in the middle of the anchor tooth 2 is directly opposite the straightening body 3, the spring sheet 6 is installed between the groove in the middle of the anchor tooth 2 and the straightening body 3, and the tooth tips extend from both sides of the straightening body 3.

[0022] In one embodiment of the present invention, a protruding ring 11 is fixedly connected to the outer wall of the unsealing tube 9, the pressure cap 10 slides and limits the protruding ring 11, and the upper pressure spring 13 is installed between the pressure cap 10 and the protruding ring 11.

[0023] In one embodiment of this utility model, the pressurized anchoring fluid channel includes a lower through hole 14, a central tube 7 and a lower connector 8 annularly connected, and a central tube 7 and a body 1 annularly connected. The lower through hole 14 is radially opened on the outer wall of the central tube 7. The lower through hole 14 connects the central tube 7 and the lower connector 8 annularly connected. A conical seat is provided at the bottom end of the central tube 7 and the lower connector 8 annularly connected. A conical piston 15 is installed in the conical seat. The conical piston 15 cooperates with the conical seat to achieve a conical surface seal. A lower pressure spring 16 is installed in the central tube 7 and the lower connector 8 annularly connected. The lower pressure spring 16 presses against the top end of the conical piston 15. The central tube 7 and the lower connector 8 annularly connected to the bottom end of the radial anchor tooth hole through the central tube 7 and the body 1 annularly connected.

[0024] In one embodiment of the present invention, an inner tube 17 is threadedly connected to the inner wall of the top end of the central tube 7. The middle part of the inner tube 17 is a small diameter section, and the small diameter section of the inner tube 17 and the inner wall of the central tube 7 form an annular cavity.

[0025] In one embodiment of this utility model, the pressure relief and anchor release channel includes a central tube 7 and a body 1 annular space, a central through hole 18, an inner tube 17 and a central tube 7 annular cavity, an upper through hole 19, an unsealing tube 9 and a body 1 annular space, an annular space between the unsealing tube 9 and the pressure cap 10, and the outside of the body 1. The central through hole 18 is radially opened on the outer wall of the central tube 7 and connects the central tube 7 and the body 1 annular space and the inner tube 17 and the central tube 7 annular cavity. The upper through hole 19 is radially opened on the outer wall of the central tube 7 and connects the inner tube 17 and the central tube 7 annular cavity and the unsealing tube 9 and the body 1 annular space. The unsealing tube 9 and the body 1 annular space are connected to the outside of the body 1 through the annular space between the unsealing tube 9 and the pressure cap 10.

[0026] In one embodiment of this utility model, the upper pressure spring 13 presses against the unsealing tube 9, the unsealing tube 9 closes the upper through hole 19, and the closed upper through hole 19 maintains the normally closed state of the pressure relief and anchor release fluid channel.

[0027] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A hydraulic anchor, characterized in that, include: The main body (1) has a through structure. A radial anchor tooth hole is provided on the middle side wall of the main body (1). An anchor tooth (2) is installed in the radial anchor tooth hole. A straightening body (3) is provided on the outside of the anchor tooth (2). The two ends of the straightening body (3) are respectively limited and connected to the main body (1) by an upper retaining ring (4) and a lower retaining ring (5). A spring plate (6) is installed between the anchor tooth (2) and the straightening body (3). A central tube (7) is sleeved in the inner cavity of the main body (1). A lower connector (8) is threaded to the inner wall of the bottom end of the main body (1). The inner wall of the lower connector (8) is threaded to the outer wall of the central tube (7). A release tube (9) is slidably connected between the top end of the main body (1) and the central tube (7). A pressure cap (10) is sleeved on the outside of the release tube (9). The cap (10) is threadedly connected to the body (1). The cap (10) slides and limits the unsealing tube (9). The top end of the unsealing tube (9) is threadedly connected to the upper connector (12). The lower connector (8) has a pressurized anchoring liquid channel on its inner side, which connects the central tube (7) and the radial anchor tooth hole and is a one-way flow channel. The top end of the central tube (7) has a pressure relief unsealing liquid channel, which connects the radial anchor tooth hole and the outside of the body (1). The bottom end of the cap (10) is equipped with an upper pressure spring (13). The upper pressure spring (13) presses the unsealing tube (9) to maintain the pressure relief unsealing liquid channel in a normally closed state. When the unsealing tube (9) is lifted, the pressure relief unsealing liquid channel opens. The radial anchor tooth hole and the outside of the body (1) are connected. After pressure relief, the upper pressure spring (13) pushes the body (1) to reset.

2. A hydraulic anchor as described in claim 1, characterized in that: The radial anchor holes are arranged in three rows, with the three rows of radial anchor holes arranged longitudinally.

3. A hydraulic anchor as described in claim 1, characterized in that: The anchor tooth (2) has a concave cross-section, and the protrusions on both sides of the anchor tooth (2) are tooth tips. The groove in the middle of the anchor tooth (2) is directly opposite the straightening body (3). The spring sheet (6) is installed between the groove in the middle of the anchor tooth (2) and the straightening body (3). The tooth tips extend from both sides of the straightening body (3).

4. A hydraulic anchor according to claim 1, characterized in that: The outer wall of the unsealing tube (9) is fixedly connected to a protruding ring (11), the pressure cap (10) slides and limits the protruding ring (11), and the upper pressure spring (13) is installed between the pressure cap (10) and the protruding ring (11).

5. A hydraulic anchor according to claim 1, characterized in that: The pressurized anchoring fluid channel includes a lower through hole (14), a central tube (7) and a lower connector (8) annulus, and a central tube (7) and body (1) annulus. The lower through hole (14) is radially opened on the outer wall of the central tube (7). The lower through hole (14) connects the central tube (7) and the lower connector (8) annulus. A conical seat is provided at the bottom of the central tube (7) and the lower connector (8). A conical piston (15) is installed in the conical seat. The conical piston (15) cooperates with the conical seat to achieve conical surface sealing. A lower pressure spring (16) is installed in the central tube (7) and the lower connector (8) annulus. The lower pressure spring (16) presses against the top of the conical piston (15). The central tube (7) and the lower connector (8) annulus is connected to the bottom of the radial anchor tooth hole through the central tube (7) and body (1) annulus.

6. A hydraulic anchor according to claim 1, characterized in that: The inner wall of the top end of the central tube (7) is threaded with an inner tube (17). The middle part of the inner tube (17) is a small diameter section. The small diameter section of the inner tube (17) and the inner wall of the central tube (7) form an annular cavity.

7. A hydraulic anchor according to claim 6, characterized in that: The pressure relief and anchor release channel includes an annular space between the central tube (7) and the body (1), a central through hole (18), an annular cavity between the inner tube (17) and the central tube (7), an upper through hole (19), an annular space between the release tube (9) and the body (1), an annular space between the release tube (9) and the pressure cap (10), and the outside of the body (1). The central through hole (18) is radially opened on the outer wall of the central tube (7), and the central through hole (18) connects the central tube (7) and the body (1). The body (1) has an annular cavity and the inner tube (17) and the central tube (7) annular cavity. The upper through hole (19) is radially opened on the outer wall of the central tube (7). The upper through hole (19) connects the inner tube (17) and the central tube (7) annular cavity and the unsealing tube (9) and the body (1) annular cavity. The unsealing tube (9) and the body (1) annular cavity are connected to the outside of the body (1) through the annular cavity between the unsealing tube (9) and the pressure cap (10).

8. A hydraulic anchor according to claim 7, characterized in that: The upper pressure spring (13) presses against the unsealing tube (9), the unsealing tube (9) closes the upper through hole (19), and the closed upper through hole (19) maintains the normally closed state of the pressure relief and anchor release fluid channel.

Images