Drilling liner hanger

Abstract

The invention relates to the technical field of drilling liner hangers, and discloses a drilling liner hanger which comprises a lifting nipple, a clamping seat is fixed to the top of a first piston, a slip mechanism is connected to the top of the clamping seat in a clamped mode, a taper sleeve mechanism is fixed to the bottom of a connecting sleeve, and a large rubber plug is fixed to the bottom of a center pipe. The drilling liner hanger and the clamping seat move upwards along with the first piston, the slip body is clamped into the opening, the extrusion block is extruded by the slip body, the copper shear pin is automatically disconnected, the extrusion block moves to drive the second piston to move, the third piston moves under the action of oil pressure, the locking block is finally clamped into the clamping groove, and the oblique teeth are clamped into the oblique angle groove. According to the device, the effect of tight and firm connection is conveniently achieved, the installation process of the device is simple and rapid, an operator can complete installation within a short time, the operation efficiency is improved, the problem that the design space of a small-gap well is insufficient can be solved through the embedded slip tail pipe hanger, and the enough annular open area and the enough inner drift diameter can be provided.

Description

Technical Field

[0001] The present invention relates to the technical field of liner hangers, in particular to a liner hanger. Background Art

[0002] Liner hangers are commonly used downhole tools in oil exploration and development. They can be divided into three types according to the different hanging methods: mechanical, hydraulic and hydraulic-mechanical double-acting. Among them, hydraulic liner hangers are the most widely used. Hydraulic liner hangers start the liner hanger cylinder by holding pressure in the tube, and the cylinder pushes the slip mechanism to achieve hanging.

[0003] The existing hydraulic liner hanger requires a large design space, resulting in a large outer diameter of the tool, making the tool unsuitable for some small clearance wells with insufficient design space. In addition, the assembly is not quick, convenient, tight and firm enough. To address the above problems, the existing equipment needs to be improved. Summary of the Invention

[0004] The object of the present invention is to provide a liner hanger to solve the problems proposed in the above background technology, that is, the existing hydraulic liner hanger requires a large design space, resulting in a large outer diameter of the tool, making the tool unsuitable for some small clearance wells with insufficient design space, and the assembly is not fast, convenient, tight and firm enough.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a tail pipe hanger, comprising a lifting pup joint, a screen cap is fixed to the bottom of the lifting pup joint, a screen cap is fixed to the bottom of the lifting pup joint, a return tube is fixed to the bottom of the return tube, a sealing sleeve is fixed to the bottom of the sealing sleeve, a packer rubber sleeve is fixed to the bottom of the packer rubber sleeve, a connecting sleeve is fixed to the bottom of the connecting sleeve, the bottom of the connecting sleeve is connected to the center tube through a connecting pipe, a liquid inlet hole is provided on the side of the connecting pipe, an oil cylinder is fixed to the outside of the connecting pipe, the oil cylinder is connected to the liquid inlet hole, a first piston is slidably connected to the oil cylinder, a clamping seat is fixed to the top of the first piston, a cava mechanism is engaged with the top of the clamping seat, a cone sleeve mechanism is fixed to the bottom of the connecting sleeve, and a large rubber plug is fixed to the bottom of the center tube.

[0006] Preferably, the slip mechanism includes a slip body, and the bottom of the slip body is snap-connected to the clamping seat, and an external thread is fixed on the outer side of the slip body.

[0007] Preferably, the two sides of the slip body are symmetrically provided with card slots, and the outer sides of the card slots are fixed with first sealing sheets, and the bottoms of the card slots are provided with beveled grooves.

[0008] Preferably, an air pressure channel is opened in the kava body, and a second sealing sheet is fixed on the top of the air pressure channel.

[0009] Preferably, the cone sleeve mechanism includes a cone sleeve body, and the cone sleeve body is fixed to the bottom of the connecting sleeve. An opening is provided at the bottom of the cone sleeve body, and the openings are evenly distributed circumferentially on the cone sleeve body. The openings are arranged in one-to-one correspondence with the slip bodies.

[0010] Preferably, a first oil groove is symmetrically provided on the two inner walls of the opening, and an extrusion mechanism is provided in the first oil groove, the extrusion mechanism includes a second piston, and the second piston is slidably connected in the first oil groove, an extrusion block is fixed on the outer side of the second piston, and the extrusion block is fixed in the first oil groove by copper shear nails.

[0011] Preferably, second oil grooves are symmetrically provided on two inner walls of the opening, and the second oil grooves are connected to the first oil grooves through a connecting channel.

[0012] Preferably, a locking mechanism is provided in the second oil groove, and the locking mechanism includes a third piston, the third piston is slidably connected in the second oil groove, and a locking block is fixed on the outer side of the third piston, and a bevel tooth is fixed on the bottom of the locking block.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The liner hanger can achieve the purposes of firm connection, easy installation and avoiding insufficient design space for small-gap wells. When the bottom of the device is sealed and hydraulic oil is passed into the device, the hydraulic oil enters the oil cylinder, the card seat moves upward together with the first piston, the slip body is stuck in the opening, the extrusion block is squeezed by the slip body, the copper shear nails are automatically disconnected, the movement of the extrusion block drives the movement of the second piston, and the third piston moves under the action of oil pressure. The locking block is finally stuck in the card groove, and the bevel teeth are stuck in the bevel groove, so as to achieve the effect of tight and firm connection. The installation process of the device is simple and fast. The operator can complete the installation in a relatively short time, which improves the working efficiency. The built-in slip liner hanger can avoid the problem of insufficient design space for small-gap wells and can also provide sufficient annular flow area and internal diameter.

[0015] 2. The liner hanger has a strong clamping force, high stability and prevents accidental falling off. The embedded slips can provide reliable suspension support. Even in high pressure, high temperature and complex downhole environments, it can ensure that the tubing will not slip, ensuring the safety of oil and gas well operations. It can effectively prevent the tubing from falling off due to unexpected situations during operation, reducing the risk of accidents. The embedded design of the slips and the cone sleeve body makes the slips less likely to be displaced or loosened by external interference during operation. This stability helps to maintain the accurate position of the tubing and provides a solid foundation for subsequent operations.

[0016] 3. The liner hanger has strong corrosion resistance and high reliability in emergency situations. The slips are usually made of corrosion-resistant materials and can be used for a long time in harsh downhole environments without corrosion damage, extending the service life of the hanger. In emergency situations, such as leaks or other sudden situations at the wellhead, the slips of the embedded slip hanger can quickly take effect to ensure safe control of the wellhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the connection structure of the connecting sleeve, connecting pipe, liquid inlet, oil cylinder, first piston, clamping seat, slip mechanism, cone sleeve mechanism and center pipe of the present invention;

[0019] Figure 3 This is a schematic diagram of the connection structure of the connecting sleeve, the clamping seat, the slip mechanism and the cone sleeve mechanism of the present invention;

[0020] Figure 4 For the present invention Figure 1 A in the middle is an enlarged structural diagram;

[0021] Figure 5 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0022] Figure 6 This is a schematic diagram of the connection structure of the second piston, the extrusion block and the copper shear pins of the present invention;

[0023] Figure 7 This is a schematic diagram of the connection structure of the third piston, locking block and helical teeth of the present invention.

[0024] In the figure: 1. lifting nipple; 2. screen cap; 3. tieback sleeve; 4. sealing sleeve; 5. packer rubber sleeve; 6. connecting sleeve; 7. connecting pipe; 8. liquid inlet hole; 9. oil cylinder; 10. first piston; 11. clamping seat; 12. slip mechanism; 1201. slip body; 1202. external thread; 1203. clamping groove; 1204. first sealing piece; 1205. bevel groove; 1206. air pressure channel; 1207. second sealing piece; 1 3. Cone sleeve mechanism; 1301. Cone sleeve body; 1302. Opening; 1303. First oil groove; 1304. Extrusion mechanism; 13041. Second piston; 13042. Extrusion block; 13043. Copper shear pin; 1305. Second oil groove; 1306. Connecting channel; 1307. Locking mechanism; 13071. Third piston; 13072. Locking block; 13073. Bevel teeth; 14. Center tube; 15. Large rubber plug. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] See also Figures 1 to 7 The present invention provides a technical solution: a tail pipe hanger, including a lifting pup joint 1, a screen cap 2 is fixed to the bottom of the lifting pup joint 1, a return tube 3 is fixed to the bottom of the screen cap 2, a sealing sleeve 4 is fixed to the bottom of the return tube 3, a packer rubber sleeve 5 is fixed to the bottom of the sealing sleeve 4, a connecting sleeve 6 is fixed to the bottom of the packer rubber sleeve 5, the bottom of the connecting sleeve 6 is connected to the center tube 14 through a connecting pipe 7, a liquid inlet hole 8 is opened on the side of the connecting pipe 7, an oil cylinder 9 is fixed to the outside of the connecting pipe 7, the oil cylinder 9 is connected to the liquid inlet hole 8, a first piston 10 is slidably connected in the oil cylinder 9, a clamping seat 11 is fixed to the top of the first piston 10, a slip mechanism 12 is engaged and connected to the top of the clamping seat 11, a cone sleeve mechanism 13 is fixed to the bottom of the connecting sleeve 6, and a large rubber plug 15 is fixed to the bottom of the center tube 14.

[0027] In this embodiment, Figure 1 、 Figure 2 and Figure 4 As shown, the cava mechanism 12 includes a cava body 1201, and the bottom of the cava body 1201 is snap-connected to the base 11. An external thread 1202 is fixed to the outside of the cava body 1201. When the first piston 10 and the base 11 move upward, the cava body 1201 moves upward accordingly, which facilitates assembly.

[0028] In this embodiment, Figure 3 and Figure 5 As shown, the card slots 1203 are symmetrically opened on both sides of the card slot 1203, and the first sealing piece 1204 is fixed on the outside of the card slot 1203, and the bottom of the card slot 1203 is opened with an angled groove 1205. The first sealing piece 1204 plays a role of sealing the card slot 1203. After the assembly operation is completed, the first sealing piece 1204 will be broken, and the component will enter the card slot 1203 and be stuck in the angled groove 1205, making the assembly effect tighter and firmer.

[0029] In this embodiment, Figure 3 and Figure 5 As shown, an air pressure channel 1206 is opened in the cava body 1201, and a second sealing piece 1207 is fixed on the top of the air pressure channel 1206. The second sealing piece 1207 seals the air pressure channel 1206. During the assembly process, the second sealing piece 1207 will be broken by the air pressure.

[0030] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the cone sleeve mechanism 13 includes a cone sleeve body 1301, and the cone sleeve body 1301 is fixed to the bottom of the connecting sleeve 6. An opening 1302 is provided at the bottom of the cone sleeve body 1301, and the openings 1302 are evenly distributed circumferentially on the cone sleeve body 1301. The openings 1302 are arranged in a one-to-one correspondence with the cava body 1201. The cava body 1201 moves up together with the clamping seat 11, and the cava body 1201 is finally clamped into the opening 1302, which facilitates assembly.

[0031] In this embodiment, Figure 3 and Figure 6 As shown, first oil grooves 1303 are symmetrically provided on the two inner walls of the opening 1302, and an extrusion mechanism 1304 is provided in the first oil groove 1303, the extrusion mechanism 1304 includes a second piston 13041, and the second piston 13041 is slidably connected in the first oil groove 1303, an extrusion block 13042 is fixed to the outside of the second piston 13041, and the extrusion block 13042 is fixed in the first oil groove 1303 by a copper shear nail 13043, when the cava body 1201 moves upward and extends into the opening 1302, the extrusion block 13042 is squeezed by the cava body 1201, the copper shear nail 13043 is automatically disconnected, the extrusion block 13042 moves, and the second piston 13041 slides in the first oil groove 1303, hydraulic oil is stored in the first oil groove 1303, and the corresponding components will move under the action of oil pressure.

[0032] In this embodiment, Figure 3 As shown, second oil grooves 1305 are symmetrically opened on the two inner walls of the opening 1302 , and the second oil groove 1305 is connected to the first oil groove 1303 through a connecting channel 1306 , and the connecting channel 1306 serves to connect the first oil groove 1303 and the second oil groove 1305 .

[0033] In this embodiment, Figure 3 and Figure 7 As shown, a locking mechanism 1307 is provided in the second oil groove 1305, and the locking mechanism 1307 includes a third piston 13071, the third piston 13071 is slidably connected in the second oil groove 1305, and a locking block 13072 is fixed to the outside of the third piston 13071, and a bevel tooth 13073 is fixed to the bottom of the locking block 13072. When the extrusion block 13042 is squeezed and moved, it will drive the second piston 13041 to move, and the third piston 13071 will move under the action of oil pressure, thereby driving the locking block 13072 to move, and the locking block 13072 will eventually be stuck in the card groove 1203, and the bevel tooth 13073 will eventually be stuck in the bevel groove 1205, so as to facilitate the completion of the assembly and locking operation.

[0034] The use method and advantages of the present invention: The working process of the tail pipe hanger is as follows:

[0035] like Figures 1 to 7 As shown: first, a ball is dropped into the device to seal it, and then hydraulic oil is passed into the device. The hydraulic oil enters the oil cylinder 9 through the liquid inlet hole 8, the first piston 10 slides upward, the card seat 11 moves upward, the slip body 1201 moves upward accordingly and is finally stuck in the opening 1302, the extrusion block 13042 is squeezed by the slip body 1201, the copper shear nail 13043 is automatically disconnected, the second piston 13041 moves with the extrusion block 13042, hydraulic oil is stored in the first oil groove 1303, the third piston 13071 and the locking block 13072 move, the locking block 13072 finally breaks through the first sealing piece 1204 and is stuck in the card groove 1203, the bevel tooth 13073 is stuck in the bevel groove 1205, and the second sealing piece 1207 is finally broken by the gas.

[0036] In summary, the liner hanger achieves the goals of firm connection, easy installation, avoiding insufficient space in small-gap well design, strong clamping force, high stability, prevention of accidental fall-off, strong corrosion resistance and high reliability in emergency situations, meeting people's usage needs.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

[0038] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the protection content of the present invention.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A liner hanger, comprising a lifting nipple (1), characterized in that: A screen cap (2) is fixed to the bottom of the lifting nipple (1), a tie-back tube (3) is fixed to the bottom of the screen cap (2), a sealing sleeve (4) is fixed to the bottom of the tie-back tube (3), a packer rubber tube (5) is fixed to the bottom of the sealing sleeve (4), a connecting sleeve (6) is fixed to the bottom of the packer rubber tube (5), the bottom of the connecting sleeve (6) is connected to the center tube (14) via a connecting tube (7), and a liquid inlet is provided on the side of the connecting tube (7). A hole (8) is formed in the connecting tube (7), an oil cylinder (9) is fixed on the outside of the connecting tube (7), the oil cylinder (9) is connected with the liquid inlet hole (8), a first piston (10) is slidably connected in the oil cylinder (9), a clamping seat (11) is fixed on the top of the first piston (10), a slip mechanism (12) is snap-connected on the top of the clamping seat (11), a cone sleeve mechanism (13) is fixed on the bottom of the connecting sleeve (6), and a large rubber plug (15) is fixed on the bottom of the center tube (14).

2. A liner hanger according to claim 1, characterized in that: The slip mechanism (12) comprises a slip body (1201), and the bottom of the slip body (1201) is snap-connected to the clamping seat (11), and an external thread (1202) is fixed on the outer side of the slip body (1201).

3. A liner hanger according to claim 2, characterized in that: The two sides of the slip body (1201) are symmetrically provided with card slots (1203), and a first sealing sheet (1204) is fixed on the outer side of the card slot (1203), and an oblique angle groove (1205) is provided at the bottom of the card slot (1203).

4. The liner hanger according to claim 2, characterized in that: An air pressure channel (1206) is provided in the slip body (1201), and a second sealing sheet (1207) is fixed on the top of the air pressure channel (1206).

5. The liner hanger according to claim 2, characterized in that: The cone sleeve mechanism (13) comprises a cone sleeve body (1301), and the cone sleeve body (1301) is fixed to the bottom of the connecting sleeve (6), an opening (1302) is provided at the bottom of the cone sleeve body (1301), and the openings (1302) are evenly distributed on the cone sleeve body (1301) in a circumferential direction, and the openings (1302) are arranged in a one-to-one correspondence with the slip body (1201).

6. The liner hanger according to claim 5, characterized in that: A first oil groove (1303) is symmetrically provided on the two inner walls of the opening (1302), and an extrusion mechanism (1304) is provided in the first oil groove (1303). The extrusion mechanism (1304) includes a second piston (13041), and the second piston (13041) is slidably connected in the first oil groove (1303). An extrusion block (13042) is fixed on the outer side of the second piston (13041), and the extrusion block (13042) is fixed in the first oil groove (1303) by means of copper shear nails (13043).

7. The liner hanger according to claim 6, characterized in that: Second oil grooves (1305) are symmetrically provided on the two inner walls of the opening (1302), and the second oil groove (1305) is connected to the first oil groove (1303) through a connecting channel (1306).

8. The liner hanger according to claim 7, characterized in that: A locking mechanism (1307) is provided in the second oil groove (1305), and the locking mechanism (1307) includes a third piston (13071), the third piston (13071) is slidably connected in the second oil groove (1305), and a locking block (13072) is fixed on the outer side of the third piston (13071), and a bevel tooth (13073) is fixed on the bottom of the locking block (13072).

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