A tailpipe hanger

Abstract

The application relates to the technical field of tailpipe hangers, and discloses a tailpipe hanger which comprises a lifting nipple, a first piston top of which is fixed with a clamping seat, the top of the clamping seat is clamped and connected with a slip mechanism, the bottom of a connecting sleeve is fixed with a taper sleeve mechanism, and the bottom of a central pipe is fixed with a large rubber plug. The tailpipe hanger is characterized in that the clamping seat moves upwards together 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 lock block is finally clamped into the clamping groove, the bevel gear is clamped into the bevel groove, and the effect of close and firm connection is achieved. The device is simple and fast to install, an operator can complete the installation within a short time, the operation efficiency is improved, the tailpipe hanger with the embedded slip can avoid the problem of insufficient design space of a small-gap well, and can also provide sufficient annular flow area and internal diameter.

Description

Technical Field

[0001] This invention relates to the field of tailpipe hanger technology, specifically to a tailpipe hanger. Background Technology

[0002] Tailpipe hangers are commonly used downhole tools in oil exploration and development. They can be divided into three types according to the different mounting methods: mechanical, hydraulic, and hydraulic-mechanical dual-acting. Among them, hydraulic tailpipe hangers are the most widely used. Hydraulic tailpipe hangers are activated by pressurizing the pipe, which in turn drives the slip mechanism to achieve mounting.

[0003] Existing hydraulic tailpipe hangers require a large design space, resulting in a large outer diameter of the tool. This makes the tool unsuitable for small-clearance wells with insufficient design space, and assembly is not quick, convenient, or secure enough. To address these issues, existing equipment needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a tailpipe hanger to solve the problems mentioned in the background art, such as the large design space required by existing hydraulic tailpipe hangers, resulting in a large outer diameter of the tool, making the tool unsuitable for some small-gap wells with insufficient design space, and the fact that the assembly is not quick, convenient, tight and secure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tailpipe hanger, comprising a lifting section, a screen cap fixed to the bottom of the lifting section, a return sleeve fixed to the bottom of the screen cap, a sealing sleeve fixed to the bottom of the return sleeve, a packer rubber sleeve fixed to the bottom of the sealing sleeve, a connecting sleeve fixed to the bottom of the packer rubber sleeve, the bottom of the connecting sleeve being connected to a central tube via a connecting pipe, an inlet hole being provided on the side of the connecting pipe, an oil cylinder fixed to the outside of the connecting pipe, the oil cylinder communicating with the inlet hole, a first piston slidably connected inside the oil cylinder, a retainer fixed to the top of the first piston, a slip mechanism engaging with the top of the retainer, a conical sleeve mechanism fixed to the bottom of the connecting sleeve, and a large rubber plug fixed to the bottom of the central tube.

[0006] Preferably, the slip mechanism includes a slip body, and the bottom of the slip body is engaged with the slip seat, and the outer side of the slip body is fixed with an external thread.

[0007] Preferably, the card body has symmetrical slots on both sides, and a first sealing piece is fixed to the outside of the slot, and an angled groove is formed at the bottom of the slot.

[0008] Preferably, the body of the Kava has an air pressure channel, and a second sealing plate is fixed to the top of the air pressure channel.

[0009] Preferably, the conical sleeve mechanism includes a conical sleeve body, which is fixed to the bottom of the connecting sleeve. The bottom of the conical sleeve body has an opening, which is evenly distributed circumferentially on the conical sleeve body. The openings correspond one-to-one with the slip body.

[0010] Preferably, the two inner walls of the opening are symmetrically provided with first oil grooves, and a pressing mechanism is provided in the first oil groove. The pressing mechanism includes a second piston, which is slidably connected in the first oil groove. A pressing block is fixed on the outside of the second piston, and the pressing block is fixed in the first oil groove by copper scissors.

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

[0012] Preferably, a locking mechanism is provided in the second oil tank, and the locking mechanism includes a third piston, which is slidably connected in the second oil tank, and a locking block is fixed on the outside of the third piston, and a helical tooth is fixed on the bottom of the locking block.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. This tailpipe hanger achieves a secure connection, is easy to install, and avoids insufficient design space in small-gap wells. When the bottom of the device is sealed and hydraulic oil is introduced into it, the hydraulic oil enters the oil cylinder, and the chuck moves upward with the first piston. The slip body engages in the opening, the compression block is squeezed by the slip body, and the copper shear pins automatically disconnect. The movement of the compression block drives the second piston to move, and the third piston moves under the action of oil pressure. The locking block finally engages in the slot, and the helical teeth engage in the beveled groove, facilitating a tight and secure connection. The installation process of this device is simple and quick, and operators can complete the installation in a short time, improving work efficiency. Moreover, the embedded slip tailpipe hanger can avoid the problem of insufficient design space in small-gap wells and can also provide sufficient annular flow area and inner diameter.

[0015] 2. This tailpipe hanger achieves high clamping force, high stability, and prevention of accidental detachment. The embedded slips provide reliable suspension support, ensuring that the tubing string will not slip even in high-pressure, high-temperature, and complex downhole environments, thus guaranteeing the safety of oil and gas well operations. It effectively prevents the tubing string 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 susceptible to displacement or loosening due to external interference during operation. This stability helps maintain the accurate position of the tubing string, providing a solid foundation for subsequent operations.

[0016] 3. This tailpipe hanger achieves strong corrosion resistance and high reliability in emergency situations. The slips are usually made of corrosion-resistant materials, which can be used for a long time in harsh downhole environments without corrosion damage, thus extending the service life of the hanger. In emergency situations, such as wellhead leakage or other sudden situations, the slips of the embedded slip hanger can quickly play a role to ensure the safe control of the wellhead. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

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

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

[0020] Figure 4 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0021] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B;

[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 diagram: 1. Lifting section; 2. Screen cap; 3. Return sleeve; 4. Sealing sleeve; 5. Packer rubber sleeve; 6. Connecting sleeve; 7. Connecting pipe; 8. Liquid inlet; 9. Oil cylinder; 10. First piston; 11. Slip holder; 12. Slip mechanism; 1201. Slip body; 1202. External thread; 1203. Slip groove; 1204. First sealing plate; 1205. Angled groove; 1206. Air pressure channel; 1207. Second sealing plate; 3. Conical sleeve mechanism; 1301. Conical 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. Helical tooth; 14. Central tube; 15. Large rubber stopper. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1 to 7 The present invention provides a technical solution: a tailpipe hanger, including a lifting section 1, a screen cap 2 fixed to the bottom of the lifting section 1, a return tube 3 fixed to the bottom of the screen cap 2, a sealing sleeve 4 fixed to the bottom of the return tube 3, a packer rubber tube 5 fixed to the bottom of the sealing sleeve 4, a connecting sleeve 6 fixed to the bottom of the packer rubber tube 5, the bottom of the connecting sleeve 6 being connected to the central tube 14 via a connecting pipe 7, an inlet hole 8 being provided on the side of the connecting pipe 7, an oil cylinder 9 fixed to the outside of the connecting pipe 7, the oil cylinder 9 communicating with the inlet hole 8, a first piston 10 being slidably connected inside the oil cylinder 9, a retainer 11 being fixed to the top of the first piston 10, a slip mechanism 12 being engaged with the top of the retainer 11, a conical sleeve mechanism 13 being fixed to the bottom of the connecting sleeve 6, and a large rubber plug 15 being fixed to the bottom of the central tube 14.

[0027] In this embodiment, as Figure 1 , Figure 2 and Figure 4 As shown, the slip mechanism 12 includes a slip body 1201, and the bottom of the slip body 1201 is engaged with the slip seat 11. The outer side of the slip body 1201 is fixed with an external thread 1202. When the first piston 10 and the slip seat 11 move upward, the slip body 1201 moves upward accordingly, which facilitates assembly.

[0028] In this embodiment, as Figure 3 and Figure 5 As shown, the card body 1201 has symmetrical slots 1203 on both sides, and a first sealing piece 1204 is fixed on the outside of the slot 1203. The bottom of the slot 1203 has an angled groove 1205. The first sealing piece 1204 seals the slot 1203. After the assembly operation is completed, the first sealing piece 1204 will be broken, and the component will enter the slot 1203 and be locked into the angled groove 1205, making the assembly effect more tight and firm.

[0029] In this embodiment, as Figure 3 and Figure 5 As shown, a pressure channel 1206 is provided inside the Kava body 1201, and a second sealing plate 1207 is fixed on the top of the pressure channel 1206. The second sealing plate 1207 blocks the pressure channel 1206. During the assembly process, the second sealing plate 1207 will be broken by the air pressure.

[0030] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the conical sleeve mechanism 13 includes a conical sleeve body 1301, which is fixed to the bottom of the connecting sleeve 6. An opening 1302 is provided at the bottom of the conical sleeve body 1301, and the openings 1302 are evenly distributed around the conical sleeve body 1301. The openings 1302 are correspondingly set with the slip body 1201. The slip body 1201 moves upward together with the slip seat 11, and the slip body 1201 is finally inserted into the opening 1302, which facilitates the completion of assembly.

[0031] In this embodiment, as Figure 3 and Figure 6 As shown, first oil grooves 1303 are symmetrically provided on the two inner walls of the opening 1302, and a pressing mechanism 1304 is provided in the first oil groove 1303. The pressing mechanism 1304 includes a second piston 13041, which is slidably connected in the first oil groove 1303. A pressing block 13042 is fixed on the outside of the second piston 13041, and the pressing block 13042 is fixed in the first oil groove 1303 by a copper shear pin 13043. When the slip body 1201 moves upward and extends into the opening 1302, the pressing block 13042 is pressed by the slip body 1201, the copper shear pin 13043 automatically disconnects, the pressing block 13042 moves, and the second piston 13041 slides in the first oil groove 1303. The first oil groove 1303 stores hydraulic oil, and the corresponding components will move under the action of oil pressure.

[0032] In this embodiment, as Figure 3 As shown, a second oil groove 1305 is 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. The connecting channel 1306 serves to connect the first oil groove 1303 and the second oil groove 1305.

[0033] In this embodiment, as 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 on the outside of the third piston 13071. A helical tooth 13073 is fixed on the bottom of the locking block 13072. When the pressing block 13042 is pressed and moved, it will drive the second piston 13041 to move. The third piston 13071 will move under the action of oil pressure, thereby driving the locking block 13072 to move. The locking block 13072 is finally locked into the slot 1203, and the helical tooth 13073 is finally locked into the angled groove 1205, which facilitates the completion of the assembly locking operation.

[0034] The method of use and advantages of this invention: The tailpipe hanger operates as follows:

[0035] like Figures 1 to 7 As shown: First, the ball is dropped into the device to seal it. Then, hydraulic oil is introduced into the device. The hydraulic oil enters the oil cylinder 9 through the inlet hole 8. The first piston 10 slides upward, the seat 11 moves upward, and the slip body 1201 moves upward and finally gets into the opening 1302. The squeezing block 13042 is squeezed by the slip body 1201, and the copper shear pin 13043 automatically disconnects. The second piston 13041 moves together with the squeezing block 13042. The first oil tank 1303 stores hydraulic oil. The third piston 13071 and the locking block 13072 move. The locking block 13072 finally breaks through the first sealing plate 1204 and gets into the slot 1203. The helical tooth 13073 gets into the beveled groove 1205. The second sealing plate 1207 is finally broken by the gas.

[0036] In summary, this tailpipe hanger achieves the goals of secure connection, easy installation, avoidance of insufficient design space in small gap wells, large clamping force, high stability, prevention of accidental detachment, strong corrosion resistance, and high reliability in emergency situations, thus meeting people's usage needs.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0038] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship 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 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 limiting the scope of protection of the present invention.

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

Claims

1. A tailpipe suspension device, comprising a lifting sub (1), characterized in that: A screen cap (2) is fixed to the bottom of the lifting section (1), a return sleeve (3) is fixed to the bottom of the screen cap (2), a sealing sleeve (4) is fixed to the bottom of the return sleeve (3), a packer sleeve (5) is fixed to the bottom of the sealing sleeve (4), a connecting sleeve (6) is fixed to the bottom of the packer sleeve (5), the bottom of the connecting sleeve (6) is connected to the central tube (14) through a connecting pipe (7), an inlet hole (8) is provided 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 inlet hole (8), and a first piston (10) is slidably connected inside the oil cylinder (9). A retainer (11) is fixed to the top of the piston (10), and a slip mechanism (12) is engaged with the top of the retainer (11). A conical 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 central tube (14). The slip mechanism (12) includes a slip body (1201), and the bottom of the slip body (1201) is engaged with the retainer (11). An external thread (1202) is fixed to the outside of the slip body (1201). The conical sleeve mechanism (13) includes a conical sleeve body (1301), and the conical sleeve body (1301) is fixed to the bottom of the connecting sleeve (6). An opening (1302) is provided at the bottom, and the openings (1302) are evenly distributed circumferentially on the cone sleeve body (1301). The openings (1302) are arranged one-to-one with the slip body (1201). The two inner walls of the openings (1302) are symmetrically provided with first oil grooves (1303), and a pressing mechanism (1304) is provided in the first oil grooves (1303). The pressing mechanism (1304) includes a second piston (13041), and the second piston (13041) is slidably connected in the first oil groove (1303). A pressing block (13042) is fixed on the outside of the second piston (13041), and the pressing block (13042) is pressed by a copper shear. The nail (13043) is fixed in the first oil groove (1303). The two inner walls of the opening (1302) are symmetrically provided with second oil grooves (1305), and the second oil grooves (1305) are connected to the first oil groove (1303) through the connecting channel (1306). The second oil groove (1305) is provided with a locking mechanism (1307), 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 outside of the third piston (13071). The bottom of the locking block (13072) is fixed with a helical tooth (13073).

2. The tailpipe hanger according to claim 1, characterized in that: The card body (1201) has symmetrical slots (1203) on both sides, and a first sealing piece (1204) is fixed on the outside of the slot (1203). The bottom of the slot (1203) has an angled groove (1205).

3. A tailpipe hanger according to claim 1, characterized in that: The Kawa body (1201) has an air pressure channel (1206) inside, and a second sealing plate (1207) is fixed to the top of the air pressure channel (1206).

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