A self-sealing steam injection string variable pitch device

Abstract

The present invention relates to the technical field of downhole auxiliary equipment, and particularly to a self-sealing steam injection string variable pitch device. A sealing cavity is fixedly connected to the lower end of the cavity bushing. A static pressure sealing ring is fixedly connected to the lower end surface of the sealing cavity. A sealing ring is fixedly connected to the lower end surface of the static pressure sealing ring. A thrust sleeve is fixedly connected to the lower end surface of the sealing ring. A sealing sleeve is fixedly connected to the lower end surface of the thrust sleeve. A piston guide sleeve is fixedly connected to the lower end surface of the sealing sleeve. A cone is connected to the lower end surface of the piston guide sleeve. By using the cavity bushing in cooperation with the sealing cavity, and the sealing ring, thrust sleeve and sealing sleeve in cooperation, and then through the variable diameter short joint braking piston running inside the piston guide sleeve, the present invention achieves flexible control of the overall device, enhances the practical performance of the overall device, and enhances the effect of sealing the annular space and compensating the stress of the pipe string.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole auxiliary equipment, and particularly to a self-sealing steam injection string variable pitch device. Background Art

[0002] A steam pipe string is a downhole tool used for sealing the annular space of a packer and compensating for the pipe string stress in the steam injection process of heavy oil wells. Most of them are operated by workers during downhole operations, bringing a lot of help and convenience to downhole work.

[0003] During the use of the existing self-sealing steam pipe string, since most of them are of an integral structure, friction will occur after the workers operate for too long, resulting in the insufficient smoothness of the facility use, thus affecting the workers' feel and work efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-sealing steam injection string variable pitch device for the deficiencies of the existing technology to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A self-sealing steam injection string variable pitch device includes a pipe. The top end of the pipe is fixedly connected with an upper joint. The lower surface of the pipe is slidably connected with a cavity compression sleeve. The lower end of the cavity compression sleeve is fixedly connected with a sealing cavity. The lower surface of the sealing cavity is fixedly connected with a static pressure sealing ring. The lower surface of the static pressure sealing ring is fixedly connected with a sealing ring. The lower surface of the sealing ring is fixedly connected with a thrust sleeve. The lower surface of the thrust sleeve is fixedly connected with a sealing sleeve. The lower surface of the sealing sleeve is fixedly connected with a piston guide sleeve. The lower surface of the piston guide sleeve is connected with a cone. The lower surface of the cone is connected with a cylinder block. The lower surface of the cylinder block is connected with a piston. The lower surface of the piston is connected with a coupling. The lower surface of the coupling is fixedly connected with a reduced-diameter nipple.

[0006] As a preferred technical solution of the present invention, the pipe is installed at the middle position between the upper joint and the cavity compression sleeve, and the upper joint and the cavity compression sleeve are located on the same vertical line, maximizing the control ability of the overall device and ensuring the practicability of the overall device.

[0007] As a preferred technical solution of the present invention, the sealing ring is installed below the end of the static pressure sealing ring, and the positions of the static pressure sealing ring and the sealing ring are located on the same vertical line, effectively strengthening the stability of each component and simultaneously enhancing the supporting force of the overall device.

[0008] As a preferred technical solution of the present invention, the thrust sleeve is located at the upper end of the sealing sleeve, while the piston guide sleeve is located at the lower end of the sealing sleeve. At the same time, the positions of the thrust sleeve and the piston guide sleeve are distributed at a vertical angle, which better strengthens the flexibility of the overall device and improves the user experience.

[0009] As a preferred technical solution of the present invention, the conical body and the cylinder block are both distributed on the same plane, and the position of the cylinder block is at the lower left diagonal of the conical body, which effectively strengthens the use effect of the overall device and increases the convenience of use.

[0010] As a preferred technical solution of the present invention, the coupling is located at the very end of the pipe. At the same time, the coupling and the reducer nipple are distributed at an oblique diagonal, which better protects the use of the overall device from being affected and strengthens the practicality of operating the overall device.

[0011] As a preferred technical solution of the present invention, the sealing ring, the thrust sleeve, and the piston guide sleeve are all located in the lower half of the surface of the pipe. At the same time, the sealing ring, the thrust sleeve, and the piston guide sleeve are all distributed on the same vertical line, which better strengthens the balance of the overall device and effectively enhances the flexibility of the overall device in use.

[0012] As a preferred technical solution of the present invention, the reducer nipple is located at the lower end of the coupling. At the same time, the angle of the reducer nipple is distributed at an oblique diagonal with the coupling, which more effectively enhances the operability of the overall device and ensures the firmness and stability during use.

[0013] As a preferred technical solution of the present invention, the positions of the conical body and the piston are respectively located at the upper and lower ends of the cylinder block. At the same time, the distance between the piston and the cylinder block is less than the distance between the conical body and the cylinder block, which maximally increases the controlability of the staff over the overall device, improves the experience of using the overall device, and reduces the operation difficulty of the staff.

[0014] As a preferred technical solution of the present invention, the cavity gland, the sealing ring, and the static pressure sealing ring are all on the surface of the same plane. At the same time, the position of the sealed cavity is outside the sealing ring and the static pressure sealing ring, which effectively strengthens the practical performance of the overall device and expands the initiative of the overall device.

[0015] As a preferred technical solution of the present invention, the thrust sleeve and the piston guide sleeve are both on the surface of the same plane. At the same time, the position of the sealing sleeve is outside the thrust sleeve and the piston guide sleeve, which more clearly and intuitively utilizes the kinetic energy during the operation of this part of the structure to connect the operation of the overall device in series and strengthens the initiative of the overall device.

[0016] The beneficial effects of the present invention are:

[0017] The self-sealing steam injection string variable pitch device uses a cavity bushing in cooperation with a sealing cavity, a sealing ring, a thrust sleeve and a sealing sleeve in cooperation, and a reduced-diameter nipple brakes a piston to run inside a piston guide sleeve, thereby achieving flexible control of the overall device, enhancing the practical performance of the overall device, and enhancing the effects of sealing ring sleeve space and pipe string stress compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a direct-view schematic diagram of the overall external structure of the present invention.

[0019] In the figure: 1. upper joint; 2. pipe; 3. cavity bushing; 4. sealing cavity; 5. sealing ring; 6. thrust sleeve; 7. sealing sleeve; 8. static pressure sealing ring; 9. cone; 10. cylinder block; 11. piston; 12. coupling; 13. reduced-diameter nipple; 14. piston guide sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figure 1-2 , in this embodiment: A self-sealing steam injection string variable pitch device includes a pipe 2, the top end of the pipe 2 is fixedly connected with an upper joint 1, which enhances the control ability of the overall device. The lower surface of the pipe 2 is slidably connected with a cavity bushing 3, which enhances the stability of each component. The lower end of the cavity bushing 3 is fixedly connected with a sealing cavity 4, which enhances the flexibility of the overall device. The lower surface of the sealing cavity 4 is fixedly connected with a static pressure sealing ring 8, which enhances the use effect of the overall device. The lower surface of the static pressure sealing ring 8 is fixedly connected with a sealing ring 5, which protects the use of the overall device from being affected. The lower surface of the sealing ring 5 is fixedly connected with a thrust sleeve 6, which enhances the balance of the overall device. The lower surface of the thrust sleeve 6 is fixedly connected with a sealing sleeve 7, which enhances the operability of the overall device. The lower surface of the sealing sleeve 7 is fixedly connected with a piston guide sleeve 14, which increases the controllability of the staff for the overall device. The lower surface of the piston guide sleeve 14 is connected with a cone 9, which enhances the practical performance of the overall device. The lower surface of the cone 9 is connected with a cylinder block 10, which enhances the motility of the overall device. The lower surface of the cylinder block 10 is connected with a piston 11, which stabilizes the range of the position and angle when all structures operate together. The lower surface of the piston 11 is connected with a coupling 12, which enhances the mechanical potential energy of the overall device during operation. The lower surface of the coupling 12 is fixedly connected with a reduced-diameter nipple 13, which enhances the durability of the overall device during use.

[0022] In this embodiment, the pipe 2 is installed at the middle position between the upper joint 1 and the cavity bushing 3, and the upper joint 1 and the cavity bushing 3 are on the same vertical line. The various components of the overall device are run-in through the matching during the use of the overall device, strengthening the coordination of the overall device during use; the sealing ring 5 is installed below the end of the static pressure sealing ring 8, and at the same time, the positions of the static pressure sealing ring 8 and the sealing ring 5 are on the same vertical line, further strengthening the matching strength of the overall device during use and avoiding the situation of asymmetric component matching during the use of the overall device; the thrust sleeve 6 is located at the upper end of the sealing sleeve 7, while the piston guide sleeve 14 is located at the lower end of the sealing sleeve 7. At the same time, the positions of the thrust sleeve 6 and the piston guide sleeve 14 are distributed at a vertical angle, jointly supporting the overall device according to the existing structure, strengthening the coordination performance of the overall device during use and enhancing the durability of the overall device during use; the cone 9 and the cylinder block 10 are both distributed on the same plane, and the position of the cylinder block 10 is at the lower left diagonal of the cone 9. By strengthening the flexible control ability of the overall device, the probability of the overall device malfunctioning during use is reduced; the position of the coupling 12 is at the very end of the pipe 2, and at the same time, the coupling 12 and the reducer nipple 13 are distributed diagonally, better enhancing the flexibility of the overall device and ensuring that it can still be used normally when reinstalled after disassembly; the sealing ring 5, the thrust sleeve 6, and the piston guide sleeve 14 are all located in the lower half of the surface of the pipe 2, and at the same time, the sealing ring 5, the thrust sleeve 6, and the piston guide sleeve 14 are all distributed on the same vertical line, using these structures to jointly carry out mechanical motion, thus ensuring that the possible malfunctions of the overall device are minimized during operation; the position of the reducer nipple 13 is at the lower end of the coupling 12, and at the same time, the angle of the reducer nipple 13 is diagonally distributed with the coupling 12, more powerfully strengthening the mechanical potential energy of the overall device during operation and saving the loss of force generated during the operation of the overall device; the positions of the cone 9 and the piston 11 are respectively at the upper and lower ends of the cylinder block 10, and at the same time, the distance between the piston 11 and the cylinder block 10 is less than the distance between the cone 9 and the cylinder block 10, strictly and clearly stabilizing the range of the positions and angles during the joint operation of all structures and avoiding the situation of mutual obstruction during the operation of the overall device; the cavity bushing 3, the sealing ring 5, and the static pressure sealing ring 8 are all on the surface of the same plane, and at the same time, the position of the sealed cavity 4 is outside the sealing ring 5 and the static pressure sealing ring 8, more clearly and intuitively using the kinetic energy during the operation of this part of the structure to connect the operation of the overall device and strengthening the initiative of the overall device; the thrust sleeve 6 and the piston guide sleeve 14 are both on the surface of the same plane, and at the same time, the position of the sealing sleeve 7 is outside the thrust sleeve 6 and the piston guide sleeve 14, effectively enhancing the practical performance of the overall device and expanding the initiative of the overall device.

[0023] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A variable pitch device for a self-sealing steam injection string, characterized in that: It includes a pipe (2), the top end of the pipe (2) is fixedly connected with an upper joint (1), the lower surface of the pipe (2) is slidably connected with a cavity bushing (3), the lower end of the cavity bushing (3) is fixedly connected with a sealed cavity (4), the lower surface of the sealed cavity (4) is fixedly connected with a static pressure sealing ring (8), the lower surface of the static pressure sealing ring (8) is fixedly connected with a sealing ring (5), the lower surface of the sealing ring (5) is fixedly connected with a thrust collar (6), the lower surface of the thrust collar (6) is fixedly connected with a sealing sleeve (7), the lower surface of the sealing sleeve (7) is fixedly connected with a piston guide sleeve (14), the lower surface of the piston guide sleeve (14) is connected with a cone (9), the lower surface of the cone (9) is connected with a cylinder block (10), the lower surface of the cylinder block (10) is connected with a piston (11), the lower surface of the piston (11) is connected with a coupling (12), the lower surface of the coupling (12) is fixedly connected with a reducing nipple (13). The thrust collar (6) and the piston guide sleeve (14) are on the same plane surface, and at the same time, the sealing sleeve (7) is located outside the thrust collar (6) and the piston guide sleeve (14), connecting the operation of the whole device in series; The cone (9) and the cylinder block (10) are both distributed on the same plane, and the cylinder block (10) is located at the lower left diagonal corner of the cone (9); The coupling (12) is located at the very end of the pipe (2), and at the same time, the coupling (12) and the reducing nipple (13) are diagonally distributed; The cone (9) and the piston (11) are respectively located at the upper and lower ends of the cylinder block (10), and at the same time, the distance between the piston (11) and the cylinder block (10) is less than the distance between the cone (9) and the cylinder block (10); 2. The variable pitch device of a self-sealing steam injection string according to claim 1, characterized in that: The pipe (2) is installed in the middle position between the upper joint (1) and the cavity bushing (3), and the upper joint (1) and the cavity bushing (3) are on the same vertical line; 3. The variable pitch device for a self-sealing steam injection string according to claim 1, characterized in that: The sealing ring (5) is installed below the end of the static pressure sealing ring (8), and at the same time, the positions of the static pressure sealing ring (8) and the sealing ring (5) are on the same vertical line; 4. A variable pitch device for a self-sealing steam injection string according to claim 1, characterized in that: The thrust collar (6) is located above the sealing sleeve (7), while the piston guide sleeve (14) is located below the sealing sleeve (7), and at the same time, the positions of the thrust collar (6) and the piston guide sleeve (14) are distributed at a vertical angle; 5. The variable pitch device for a self-sealing steam injection string according to claim 1, wherein: The sealing ring (5), the thrust collar (6) and the piston guide sleeve (14) are all located in the lower half part of the surface of the pipe (2), and at the same time, the sealing ring (5), the thrust collar (6) and the piston guide sleeve (14) are all distributed on the same vertical line; 6. The variable pitch device for a self-sealing steam injection string according to claim 1, characterized in that: The reducing nipple (13) is located at the lower end of the coupling (12), and at the same time, the angle of the reducing nipple (13) is diagonally distributed with the coupling (12); 7. A variable pitch device for a self-sealing steam injection string according to claim 1, characterized in that: The cavity bushing (3), the sealing ring (5) and the static pressure sealing ring (8) are all on the same plane surface, and at the same time, the sealed cavity (4) is located outside the sealing ring (5) and the static pressure sealing ring (8);

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