Recoverable open hole anchoring packer

Abstract

The utility model discloses a recoverable open hole anchoring packer which comprises an upper connector, a central pipe, a piston body, a two-way hinge slip and a locking ring. One end of the central pipe is detachably connected with the upper connector, and a pressure transmitting hole is formed in the middle of the central pipe; the piston body is arranged on the outer wall of the central pipe in a sleeving manner, and the piston body is communicated with the pressure transmission hole; the two-way hinge slip is arranged on one side of the piston body, and after the piston body is pressed, the piston body abuts against the two-way hinge slip to be opened. Due to the fact that the two-way hinge slip, the piston body and the locking ring are arranged, the piston body extrudes the two-way hinge slip, two-way anchoring force is obtained, and anchoring reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field well completion, in particular to a recoverable open hole anchoring packer. Background Art

[0002] In many operations in open hole wells, it is necessary to anchor the open hole tools on the open hole well wall, and the open hole anchor packer can be used for suspension, temporary plugging, and stratum isolation. In actual operations, due to the large annulus between the pipe string and the open hole well wall, the rock strength and toughness of the open hole well wall cannot be compared with the steel of the casing, and the space for ordinary slips to lift is limited by the outer diameter. If used in open hole wells, the strength and toughness of the well wall are poor and cannot be better anchored to the well wall. The utility model patent with publication number CN204098848U publicly authorizes a toe-anchored open-hole external pipe packer, which constructs the basic structure of the packer by arranging an upper joint, a central pipe, a lower joint, a liner, a rubber tube, a cava seat and a cava; specifically, a tooth is arranged on the upper part of the liner, and a locking ring is arranged on the lower part of the upper joint, and the tooth and the locking ring are engaged with each other, which realizes the independent sealing and locking of the rubber tube, and can effectively prevent the problem of displacement of the sealing component after a slight displacement of the anchoring component due to insufficient anchoring force, which ultimately reduces the sealing performance.

[0003] However, in actual use, the above-mentioned toe-anchored open-hole external casing packer still does not solve the problem of slight displacement of the anchoring component due to insufficient anchoring force, that is, the anchoring reliability is still low. Utility Model Content

[0004] The utility model aims to overcome the above technical deficiencies, propose a retrievable open hole anchoring packer, and solve the technical problem of low anchoring reliability in the prior art.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, the utility model provides a recyclable open hole anchoring packer, comprising an upper joint, a center pipe, a piston body, a bidirectional hinged cava and a locking ring; one end of the center pipe is detachably connected to the upper joint, and a pressure transmission hole is opened in the middle of the center pipe; the piston body is sleeved on the outer wall of the center pipe, and the piston body is connected to the pressure transmission hole; the bidirectional hinged cava is arranged on one side of the piston body, and when the piston body is pressurized, it is stretched open as the piston body abuts against the bidirectional hinged cava; the locking ring is engaged with the other side of the piston body.

[0007] In some embodiments, the piston body includes an upper piston, a lower piston and a sealing cylinder. The upper piston and the lower piston are arranged on both sides of the central tube, and the sealing cylinder is sleeved on the outer sides of the upper piston and the lower piston and forms a piston cavity with the upper piston and the lower piston, and the pressure transmission hole is connected to the piston cavity.

[0008] In some embodiments, the outer side of the lower piston abuts against one side of the bidirectional hinge slip.

[0009] In some embodiments, the bidirectional hinge slip comprises an anchor claw support rod, an anchor claw and a pin shaft, the anchor claw support rod is connected to the lower piston via the pin shaft, the anchor claw is connected to the center tube via another pin shaft, the anchor claw support rod abuts against one side opposite to the anchor claw, and when the lower piston continues to move toward one side of the anchor claw, the anchor claw support rod abuts against the anchor claw and causes the anchor claw to open.

[0010] In some embodiments, the bidirectional hinged cava also includes an intermediate connecting sleeve, which is arranged on the outside of the central tube, and the anchor claw support rod and the anchor claw are symmetrically arranged on both sides of the intermediate connecting sleeve, and an anchor claw support rod and an anchor claw are provided on each side.

[0011] In some embodiments, the locking ring is a double-sided tooth structure.

[0012] In some embodiments, the teeth on one side of the locking ring are connected to the sealing tube, and the teeth on the other side of the locking ring are connected to the upper piston.

[0013] In some embodiments, one end of the central tube is threadedly connected to the upper joint.

[0014] In some embodiments, a sealing ring is embedded between the upper joint and the central tube.

[0015] In some embodiments, the sealing ring is an O-ring.

[0016] In a second aspect, the utility model also provides a retrievable open hole anchor packer.

[0017] Compared with the prior art, the utility model provides a retrievable open hole anchoring packer, which constructs a specific anchoring structure by arranging a two-way hinge cava and a piston body; further, the pressure transmission hole of the central tube is connected to the piston body, so that the operator can inject pressure into the piston body through the central tube and the pressure transmission hole in sequence, which makes one side of the piston body continuously abut against the two-way hinge cava and makes the two-way hinge cava open and exert a two-way anchoring force on the well wall, thereby greatly improving the anchoring reliability; further, the locking ring is engaged with the other side of the piston body, so that after the two-way hinge cava is opened, it can be sealed and locked by the locking ring, thereby ensuring the stability of the anchoring, that is, effectively improving the anchoring reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an isometric diagram of a retrievable open hole anchor packer provided by an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 The internal structure of Figure 1 (The two-way hinge slip is in the closed state);

[0020] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0021] Figure 4 yes Figure 1 The internal structure of Figure 2 (The two-way hinge slips are in the open state).

[0022] Description of reference numerals:

[0023] 100, upper joint; 200, center tube; 210, pressure transmission hole; 300, piston body; 310, upper piston; 320, lower piston; 330, sealing cylinder; 340, piston chamber; 400, two-way hinge slip; 410, anchor claw support rod; 420, anchor claw; 430, pin shaft; 440, middle connecting sleeve; 500, locking ring; 600, sealing ring; 610, O-ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] In order to solve the technical problem of low anchoring force reliability, the utility model provides a recoverable open-hole anchoring packer, which can achieve a significant improvement in anchoring force reliability.

[0026] It should be noted that the recoverable open hole anchored packer described in the utility model is used for but not limited to open hole wells, etc. For the convenience of explanation, in the utility model, only a recoverable open hole anchored packer applied to an open hole well is used as an example for explanation, and the principle of a recoverable open hole anchored packer applied to other types of equipment is substantially the same as that applied to an open hole well, which will not be repeated here.

[0027] See also Figure 1 - Figure 4 ,in Figure 1 This is a structural schematic diagram of a recoverable open hole anchor packer in one embodiment of the utility model, a recoverable open hole anchor packer, including an upper joint 100, a center pipe 200, a piston body 300, a two-way hinge cava 400 and a locking ring 500; one end of the center pipe 200 is detachably connected to the upper joint 100, and a pressure transmission hole 210 is opened in the middle of the center pipe 200; the piston body 300 is sleeved on the outer wall of the center pipe 200, and the piston body 300 is connected to the pressure transmission hole 210; the two-way hinge cava 400 is arranged on one side of the piston body 300, and when the piston body 300 is pressurized, it is stretched open as the piston body 300 abuts against the two-way hinge cava 400; the locking ring 500 is engaged with the other side of the piston body 300.

[0028] In the present embodiment, a specific anchoring structure and a locking structure are first constructed by providing a two-way hinge cava 400 and a locking ring 500; then, the pressure is continuously transmitted to the piston body 300 by utilizing the pressure transmission hole 210 of the central tube 200, so that the side of the piston body 300 close to the two-way hinge cava 400 continuously abuts against the two-way hinge cava 400 and forces the two-way hinge cava 400 to open, thereby realizing two-way anchoring and effectively ensuring the reliability of anchoring; in addition, since the locking ring 500 is engaged with the other side of the piston body 300, the locking ring 500 can be locked by engagement after the two-way hinge cava 400 is opened, thereby further ensuring the stability of the anchoring.

[0029] In one embodiment, see Figure 2 The piston body 300 includes an upper piston 310, a lower piston 320 and a sealing cylinder 330. The upper piston 310 and the lower piston 320 are respectively arranged on both sides of the central tube 200, and the sealing cylinder 330 is sleeved on the outer sides of the upper piston 310 and the lower piston 320 and forms a piston chamber 340 with the upper piston 310 and the lower piston 320. The pressure transmission hole 210 is connected to the piston chamber 340.

[0030] In this embodiment, the pressure transmission hole 210 is connected with the piston cavity 340 to ensure the correct transmission of pressure, and the upper piston 310 and the lower piston 320 move in opposite directions respectively after being pressurized. The upper piston 310 can play a role in sealing and improving pressure resistance, while the lower piston 320 specifically helps the two-way hinge cava 400 to open and realize two-way anchoring.

[0031] In one embodiment, see Figure 3 The outer side of the lower piston 320 abuts against one side of the two-way hinge cava 400.

[0032] In one embodiment, see Figure 2 , Figure 4 The two-way hinge slip 400 includes an anchor claw support rod 410, an anchor claw 420 and a pin 430. The anchor claw support rod 410 is connected to the lower piston 320 through the pin 430, and the anchor claw 420 is connected to the center pipe 200 through another pin 430. The anchor claw support rod 410 and the opposite side of the anchor claw 420 abut against each other, and when the lower piston 320 continues to move toward one side of the anchor claw 420, the anchor claw support rod 410 abuts against the anchor claw 420 and causes the anchor claw 420 to open.

[0033] In this embodiment, the fluke support rod 410 is not only used to abut against the fluke 420 to achieve expansion and anchoring, but also can play an effective auxiliary role through support, thereby helping to improve the anchoring reliability.

[0034] In one embodiment, see Figure 1 , Figure 2 , Figure 4 The bidirectional hinged cava 400 also includes an intermediate connecting sleeve 440, which is sleeved on the outside of the central tube 200. The anchor support rod 410 and the anchor 420 are symmetrically arranged on both sides of the intermediate connecting sleeve 440, and an anchor support rod 410 and an anchor 420 are arranged on each side.

[0035] In this embodiment, the anchor support rod 410 and the anchor 420 are symmetrically arranged along the two sides of the middle connecting sleeve 440, so that the purpose of bidirectional anchoring can be specifically achieved, thereby improving the anchoring reliability.

[0036] In one embodiment, see Figure 2 , the lock ring 500 is a double-sided tooth structure.

[0037] In this embodiment, the double-sided tooth structure helps the locking ring 500 to achieve locking and provide better sealing force.

[0038] In one embodiment, see Figure 3 The teeth on one side of the locking ring 500 are connected to the sealing cylinder 330 , and the teeth on the other side of the locking ring 500 are connected to the upper piston 310 .

[0039] In this embodiment, the locking ring 500 is locked after being meshed with the sealing cylinder 330 and the upper piston 310 and transmitted to a certain position, which facilitates locking and providing a sealing force.

[0040] In one embodiment, see Figure 1 One end of the central tube 200 is threadedly connected to the upper joint 100 .

[0041] In this embodiment, the threaded connection method is convenient for disassembly and future maintenance.

[0042] In one embodiment, see Figure 2 A sealing ring 600 is embedded between the upper joint 100 and the central pipe 200 .

[0043] In this embodiment, the sealing ring 600 can effectively improve the sealing performance.

[0044] In one embodiment, see Figure 2 , the sealing ring 600 is an O-ring 610 .

[0045] In this embodiment, the O-ring 610 can avoid periodic adjustment and also has a self-sealing effect.

[0046] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the utility model is described in detail:

[0047] First, the oil is pressurized through the oil pipe and enters the piston chamber 340 through the central pipe 200 and the pressure transmission hole 210 in sequence; then, under the action of the pressure, the upper piston 310 and the lower piston 320 move in opposite directions respectively, wherein the lower piston 320 continuously abuts against and squeezes the single-sided fluke support rod 410, while the fluke support rod 410 abuts against the fluke 420 and forces the fluke support rod 410 to open; similarly, the fluke support rod 410 on the other side and the adjacent fluke 420 are also forced to open. The expansion action is completed, that is, the two-way hinge cava 400 completes the two-way expansion at this time, providing a two-way anchoring force, and effectively improving the reliability of anchoring; in addition, since the locking ring 500 is engaged with the other side of the piston body 300, after the two-way hinge cava 400 is expanded, the locking ring 500 is locked after being engaged and transmitted to a certain position, and provides good locking force and sealing force, which helps to ensure the stability of anchoring, that is, the anchoring reliability of the recoverable open hole anchoring packer is greatly improved.

[0048] The above specific implementation methods of the utility model do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A retrievable open hole anchor packer, characterized in that: include: Upper joint; A central tube, one end of which is detachably connected to the upper joint, and a pressure transmission hole is provided in the middle of the central tube; A piston body, wherein the piston body is sleeved on the outer wall of the central tube and is connected with the pressure transmission hole; A two-way hinge slip, which is arranged on one side of the piston body and is opened when the piston body abuts against the two-way hinge slip when the piston body is compressed; A locking ring is engaged with the other side of the piston body.

2. A retrievable open hole anchor packer according to claim 1, characterized in that: The piston body includes an upper piston, a lower piston and a sealing cylinder. The upper piston and the lower piston are arranged on both sides of the central tube, and the sealing cylinder is sleeved on the outer sides of the upper piston and the lower piston and forms a piston cavity with the upper piston and the lower piston. The pressure transmission hole is connected to the piston cavity.

3. A retrievable open hole anchor packer according to claim 2, characterized in that: The outer side of the lower piston abuts against one side of the bidirectional hinge slip.

4. A retrievable open hole anchor packer according to claim 2, characterized in that: The two-way hinge slip comprises an anchor claw support rod, an anchor claw and a pin shaft, wherein the anchor claw support rod is connected to the lower piston through the pin shaft, the anchor claw is connected to the center pipe through another pin shaft, the anchor claw support rod abuts against one side opposite to the anchor claw, and when the lower piston continues to move toward one side of the anchor claw, the anchor claw support rod abuts against the anchor claw and causes the anchor claw to open.

5. A retrievable open hole anchor packer according to claim 4, characterized in that: The bidirectional hinge slip also includes a middle connecting sleeve, which is sleeved on the outside of the central tube. The anchor claw support rod and the anchor claw are symmetrically arranged on both sides of the middle connecting sleeve, and one anchor claw support rod and one anchor claw are arranged on each side.

6. A retrievable open hole anchor packer according to claim 2, characterized in that: The lock ring has a double-sided tooth structure.

7. A retrievable open hole anchor packer according to claim 6, characterized in that: The teeth on one side of the lock ring are connected to the sealing cylinder, and the teeth on the other side of the lock ring are connected to the upper piston.

8. The retrievable open hole anchor packer according to claim 1, characterized in that: One end of the central tube is threadedly connected to the upper joint.

9. The retrievable open hole anchor packer according to claim 1, characterized in that: A sealing ring is embedded between the upper joint and the central pipe.

10. A retrievable open hole anchor packer according to claim 9, characterized in that: The sealing ring is an O-type sealing ring.

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