Casing short joint device

Abstract

The present invention discloses a cementing nipple device, which includes an outer cylinder. An annular protrusion is provided at the middle position of the inner wall, and the annular protrusion divides the inner part of the outer cylinder into two independent and connected connection areas; a convex ring is also formed in the inner area of the annular protrusion; there are two sets of connection components, which are symmetrically arranged at the upper and lower ends inside the outer cylinder, and each set of connection components is distributed at equal angles around the axis of the outer cylinder; the connection component is composed of a threaded piece, an adjusting plate, and a mounting plate; in the present invention, multiple arc-shaped threaded pieces are used to replace the original threaded structure. During connection, the threaded pieces can be closely attached to the pipeline through the threaded pieces to form a stable threaded connection with the pipeline. In the later separation, if the traditional upward rotation disassembly method fails, only need to continue to rotate the pipeline downward, press against the adjusting plate, and continue to apply a downward pressure force to easily break these threaded pieces, so that the threaded connection between the threaded pieces and the pipeline is destroyed, and the smooth separation of the pipeline can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum cementing equipment, and in particular relates to a cementing short-circuit device. Background Art

[0002] The cementing short-circuit device is a special device used in oil cementing operations. It is mainly used to connect casing and ensure the stability and sealing of casing during cementing. It forms a reliable connection between casings so that cement slurry can be evenly injected into the annular space between the wellbore and casing, thus completing the cementing operation.

[0003] In the complex and delicate process of cementing, a crucial link is to accurately connect the pipeline through a special casing structure and then insert it into the wellbore to perform cementing operations. This step not only requires a high degree of technical precision, but also requires ensuring the stability and sealing of the connection to effectively prevent well fluid leakage, ensure operational safety and the normal operation of subsequent oil wells. However, after the cementing task is successfully completed, the challenge is shifted to how to safely and efficiently separate the pipeline from the casing.

[0004] In actual operation, threaded connection is often used to achieve a tight connection between the pipe and the casing. This design is theoretically easy to install and disassemble. However, the reality is often not satisfactory, especially after being subjected to the test of high pressure, high temperature and corrosive environment underground for a long time, the threaded connection may have a problem of reduced fit due to wear, corrosion or over-tightening, and the pipe cannot be screwed outwards, but can be screwed inwards, making it impossible to separate and disassemble the pipe and casing. This "only in but not out" phenomenon not only seriously hinders the progress of subsequent work, but may also cause equipment damage due to forced separation, and even cause safety accidents. Summary of the invention

[0005] The object of the present invention is to provide a cementing short-circuit device to solve the problem that the pipe and the casing cannot be screwed up and separated in the existing cementing operation mentioned in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a cementing nipple device, including an outer cylinder, in the middle position of the inner wall, there is an annular protrusion, which divides the inner part of the outer cylinder into two independent and connected connection areas; a convex ring is also formed in the inner area of the annular protrusion; there are two sets of connection components, which are symmetrically arranged at the upper and lower ends inside the outer cylinder, and each set of connection components is equally angularly distributed around the axis of the outer cylinder; the connection component is composed of a threaded piece, an adjusting plate, and a mounting plate. Among them, the bottom of the mounting plate is fixedly arranged on the annular protrusion, and the threaded piece is arranged on the top of the mounting plate. The adjusting plate is entirely in the annular area between the threaded piece and the outer cylinder, and the top end of the adjusting plate is fixed to the top surface of the outer surface of the threaded piece, while the bottom end of the adjusting plate passes through the mounting plate by bending and extends horizontally towards the central area of the outer cylinder; the adjusting plate is fixedly connected to the mounting plate and the threaded piece; by pressing down the adjusting plate, the threaded piece is driven to be misaligned synchronously, so as to realize the separation of the threaded piece from the external pipeline; there is also a sealing spacer; one end of the sealing spacer is lapped on the convex ring, and the other end is on the connection component, and the sealing between the connection component and the outer cylinder is realized through the sealing spacer.

[0007] As a preferred technical solution in the present invention, a slot for the bottom of the adjusting plate to pass through is opened on the surface of the mounting plate. A welding point part is formed between the adjusting plate and the top surface of the slot. The rigid connection between the adjusting plate and the mounting plate is realized through the welding point part. A fixing piece is also fixed on the inner side surface of the adjusting plate, and the fixing piece is fixed to the bottom area of the threaded piece. An inclined part that abuts against the external pipeline is formed on the end surface of the horizontal end of the adjusting plate. In normal connection, the driving threshold of the external device is set, so that after the pipeline is connected to the threaded piece, when the upper ring is squeezed but the welding point part is not damaged, it stops. The inclined part is in contact with the pipeline by extrusion. When the traditional method of unscrewing and separating cannot be realized, when the pipeline is rotated, the pipeline will first squeeze the adjusting plate, so that part of the welding point part is first damaged. At this time, the rigid connection between the adjusting plate and the mounting plate is removed. At this time, under the continuous downward pressure of the pipeline, it will contact the inclined part. At this time, the whole adjusting plate moves towards the middle of the inner wall of the outer cylinder in an inclined direction, and the adjusting plate is pushed towards the outer cylinder through the inclined part. At this time, the adjusting plate drives the threaded piece to move synchronously through the fixing piece, so as to realize the separation of the threaded piece from the pipeline.

[0008] As a preferred technical solution in the present invention, the adjusting plate is integrally an arc-shaped plate body with two unequal slopes, and a corner point is formed in the upper region of the adjusting plate. This corner point contacts the inner wall of the outer cylinder, and an arc-shaped guide rod is provided in the included angle region formed by the corner point and the upper part of the threaded piece. The guide rod contacts the outer wall of the threaded piece, and a fixed block is fixed at one end of the guide rod. The fixed block is fixed on the inner wall of the outer cylinder. When the adjusting plate is pushed by the pipeline and moves towards the inner wall of the outer cylinder, the inner wall of the included angle region of the adjusting plate gradually abuts against the guide rod. At this time, the guide rod can force the upper region of the adjusting plate to produce slight deformation, that is, the upper region of the adjusting plate moves towards the inner wall of the outer cylinder. At this time, the threaded piece fixed to the top of the adjusting plate will also tilt towards the inner wall of the outer cylinder. At the same time, under the drive of the fixing piece, the whole threaded piece can be made to approach the outer cylinder. At this time, the separation of the threaded piece from the pipeline can be realized.

[0009] As a preferred technical solution in the present invention, the sealing spacer includes an upper ring, a lower ring, and partition blocks arranged at equal angles between the two. The partition blocks are located between every two adjacent connection components and abut against the side wall of the mounting plate, so as to seal the distance between every two adjacent connection components. The lower ring is located between the horizontal region of the adjusting plate and the convex ring and abuts against both of them respectively, so as to seal the gap existing between the whole connection component and the bottom region of the outer cylinder, achieving the purpose of preventing leakage. At the same time, when the adjusting plate is pressed down, the sealing spacer is always in a compressed state and its sealing performance is not affected. The upper ring is placed at the top position of the horizontal region of the adjusting plate. During installation, it can be extrusion-connected with the external pipeline to achieve sealing.

[0010] As a preferred technical solution in the present invention, the inner wall of the mounting plate is in a smooth curved surface shape and is in curved surface contact with the pipeline, so as to ensure that the subsequent separation of the pipeline is not affected. The inner wall of the bottom of the threaded piece has an inclined portion that extends towards the inner wall of the outer cylinder, so as to prevent the bottom from abutting against the pipeline when the threaded piece is tilted.

[0011] As a preferred technical solution in the present invention, the initial state of the threaded piece and the mounting plate is vertical to ensure normal connection, and the contact end surface of the mounting plate and the threaded piece is a flat connection, which is convenient for quickly adjusting the position of the threaded piece in the later stage.

[0012] As a preferred technical solution in the present invention, the convex ring is located in the middle of the annular protrusion, and the inner diameter of the convex ring is equal to the inner diameter of the sealing spacer.

[0013] As a preferred technical solution in the present invention, sealing rubber rings are also provided at both end faces of the outer cylinder. The vertical projection of the sealing rubber ring covers the entire vertical projection area of the threaded sheet, avoiding leakage areas in the threaded sheet. In actual use, the sealing rubber ring can be installed by means of glue bonding. The sealing of both ends of the outer cylinder is achieved through the sealing rubber ring, preventing the entry of external objects. At the same time, in cooperation with the sealing spacer ring, a double-sealing effect can be achieved.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] In the present invention, multiple arc-shaped threaded sheets are used to replace the original threaded structure. During connection, the threaded sheets can be closely attached to the pipeline through threading, forming a stable threaded connection with the pipeline. In the later separation process, if the traditional upward rotation and disassembly method fails, only need to continue to rotate the pipeline downward and press against the adjusting plate, and continue to apply a downward pressure force to easily break these threaded sheets, so that the threaded connection between the threaded sheets and the pipeline is destroyed, thus realizing the smooth separation of the pipeline. This design not only retains the stability of the threaded connection, but also makes the sleeve flexible and detachable. At the same time, in order to ensure the sealing performance during the connection process, a sealing spacer ring and a sealing rubber ring are also provided, which can be tightly filled between the threaded sheets, effectively blocking the possibility of well fluid penetration. Even in extreme working environments, the sealing rings of the entire connection system can be guaranteed. This design effectively solves the problem of disassembly of the traditional threaded structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the cementing nipple device;

[0017] Figure 2 is the cross-sectional view of the cementing nipple device;

[0018] Figure 3 is Figure 2 the enlarged schematic diagram of area A in

[0019] Figure 4 is Figure 2 the enlarged schematic diagram of area B in

[0020] Figure 5 is the structural schematic diagram of the connection assembly;

[0021] Figure 6 is the connection schematic diagram of the adjusting plate and the mounting plate;

[0022] Figure 7 is the structural schematic diagram of the sealing spacer ring.

[0023] In the figure:

[0024] 100. Outer cylinder; 101. Sealing rubber ring; 102. Convex ring; 103. Guide rod; 104. Fixed block;

[0025] 200. Connection assembly; 201. Threaded piece;

[0026] 202. Adjusting plate; 202a. Inclined part; 202b. Welding point part; 202c. Fixed piece;

[0027] 203. Mounting plate; 203a. Slot;

[0028] 300. Sealing spacer ring; 301. Upper ring; 302. Partition block; 303. Lower ring. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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.

[0030] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a cementing nipple device, including

[0031] An outer cylinder 100, with an annular protrusion provided at the middle position of the inner wall. This annular protrusion divides the inner part of the outer cylinder 100 into two independent and connected connection areas; a convex ring 102 is also formed in the inner area of the annular protrusion;

[0032] Two sets of connection assemblies 200 are provided and symmetrically placed at the upper and lower ends inside the outer cylinder 100. Each set of connection assemblies 200 is evenly distributed around the axis of the outer cylinder 100 at equal angles;

[0033] The connection assembly 200 is composed of a threaded piece 201, an adjusting plate 202, and a mounting plate 203. Among them, the bottom of the mounting plate 203 is fixedly provided on the annular protrusion, which can be specifically fixed by welding. The threaded piece 201 is arranged on the top of the mounting plate 203. The adjusting plate 202 is entirely in the annular area between the threaded piece 201 and the outer cylinder 100. During the later separation of the threaded piece 201, the adjusting plate 202 will also move within the annular area. The top end of the adjusting plate 202 is fixed to the top surface of the outer surface of the threaded piece 201, and the bottom end of the adjusting plate 202 passes through the mounting plate 203 by bending and horizontally extends towards the central area of the outer cylinder 100; the adjusting plate 202 is fixedly connected to the mounting plate 203 and the threaded piece 201; by pressing down the adjusting plate 202, the threaded piece 201 is driven to be misaligned synchronously, so as to realize the separation of the threaded piece 201 from the external pipeline, facilitating subsequent disassembly;

[0034] It further includes a sealing spacer 300; one end of the sealing spacer 300 is lapped on the convex ring 102, and the other end is on the connecting assembly 200, and the sealing between the connecting assembly 200 and the outer cylinder 100 is realized through the sealing spacer 300.

[0035] In this embodiment, a slot 203a for the bottom of the adjusting plate 202 to penetrate is formed on the surface of the mounting plate 203. A soldering point part 202b is formed between the adjusting plate 202 and the top surface of the slot 203a. The rigid connection between the adjusting plate 202 and the mounting plate 203 is realized through the soldering point part 202b. A fixing piece 202c is also fixed on the inner side surface of the adjusting plate 202. The fixing piece 202c is fixed to the bottom area of the threaded piece 201. An inclined part 202a that abuts against the external pipeline is formed on the end surface of the horizontal end of the adjusting plate 202. In normal connection, the driving threshold of the external device is set so that after the pipeline is connected to the threaded piece 201, when the upper ring 301 is squeezed but the soldering point part 202b is not damaged, it stops. The inclined part 202a is in extrusion contact with the pipeline. When the traditional method of screwing and separating cannot achieve disassembly, when the pipeline is rotated, the pipeline will first squeeze the adjusting plate 202, causing part of the soldering point part 202b to be damaged first. At this time, the rigid connection between the adjusting plate 202 and the mounting plate 203 is removed. At this time, during the continuous downward pressure of the pipeline, it will contact the inclined part 202a. At this time, the whole adjusting plate 202 moves towards the middle of the inner wall of the outer cylinder 100 in an inclined direction, and the adjusting plate 202 is pushed towards the outer cylinder 100 through the inclined part 202a. At this time, the adjusting plate 202 drives the threaded piece 201 to move synchronously through the fixing piece 202c, so as to realize the separation of the threaded piece 201 and the pipeline.

[0036] In this embodiment, the whole adjusting plate 202 is an arc-shaped plate body with two unequal slopes, and a corner point is formed in the upper area of the adjusting plate 202. The corner point contacts the inner wall of the outer cylinder 100, and an arc-shaped guide rod 103 is provided in the included angle area formed by the corner point and the upper part of the threaded piece 201. The guide rod 103 contacts the outer wall of the threaded piece 201. One end of the guide rod 103 is fixed with a fixing block 104, and the fixing block 104 is fixed on the inner wall of the outer cylinder 100. When the adjusting plate 202 is pushed by the pipeline and moves towards the inner wall of the outer cylinder 100, the adjusting plate 202 gradually abuts against the guide rod 103 in the included angle area. At this time, the guide rod 103 can force the upper area of the adjusting plate 202 to produce slight deformation, that is, the upper area of the adjusting plate 202 moves towards the inner wall direction of the outer cylinder 100. At this time, the threaded piece 201 fixed to the top of the adjusting plate 202 also inclines towards the inner wall of the outer cylinder 100. At the same time, under the drive of the fixing piece 202c, the whole threaded piece 201 moves closer to the outer cylinder 100. At this time, the separation of the threaded piece 201 and the pipeline can be realized.

[0037] In this embodiment, the sealing spacer 300 includes an upper ring 301, a lower ring 303, and spacer blocks 302 arranged at equal angles therebetween. The spacer blocks 302 are located between every two adjacent connecting components 200 and abut against the side wall of the mounting plate 203, thereby sealing the distance between every two adjacent connecting components 200. The lower ring 303 is located between the horizontal area of the adjusting plate 202 and the convex ring 102 and abuts against both of them respectively, thereby achieving the sealing of the gap existing between the entire connecting component 200 and the bottom area of the outer cylinder 100, achieving the purpose of preventing leakage. At the same time, when the adjusting plate 202 is pressed downward, the sealing spacer 300 is always in a compressed state and its sealing performance is not affected; the upper ring 301 is placed at the top position of the horizontal area of the adjusting plate 202. During installation, it can be extrusion-connected with an external pipeline and achieve sealing.

[0038] In this embodiment, the inner wall of the mounting plate 203 is a smooth curved surface and is in curved contact with the pipeline, so as to ensure that the separation of the pipeline in the later stage is not affected. The bottom inner wall of the threaded piece 201 has an inclined portion that extends toward the inner wall direction of the outer cylinder 100 to prevent the bottom from abutting against the pipeline when the threaded piece 201 is inclined.

[0039] In this embodiment, the initial state of the threaded piece 201 and the mounting plate 203 is vertical to ensure normal connection, and the contact end surface between the mounting plate 203 and the threaded piece 201 is a flat connection, which is convenient for quickly adjusting the position of the threaded piece 201 in the later stage.

[0040] In this embodiment, the convex ring 102 is located at the middle position of the annular protrusion, and the inner diameter of the convex ring 102 is equal to the inner diameter of the sealing spacer 300.

[0041] In this embodiment, sealing rubber rings 101 are also provided at both end faces of the outer cylinder 100. The vertical projection of the sealing rubber rings 101 covers the entire vertical projection area of the threaded piece 201 to prevent leakage areas in the threaded piece 201. In actual use, the sealing rubber rings 101 can be installed by gluing. The sealing of both ends of the outer cylinder 100 is achieved through the sealing rubber rings 101 to prevent the entry of external objects. At the same time, in cooperation with the sealing spacer 300, a double-sealing effect can be achieved to ensure that normal processing is not affected.

[0042] In the present invention, first refer to Figure 3 , set the rotation speed and time of the device for clamping the external pipeline, so that during the installation with the outer cylinder 100, the pipeline will first be threadedly connected to the threaded piece 201. During continuous downward rotation, the pipeline contacts and presses against the upper ring 301. At this time, when the pipeline rotates downward for the set time and the pipeline presses against the upper ring 301 but does not damage the state of the welding point portion 202b, stop. At this time, the sealing of the connection can be achieved;

[0043] In the later disassembly process, the device that externally clamps the pipeline rotates in the reverse direction to loosen the pipeline and achieve the separation of the pipeline from the outer cylinder 100. When the traditional upward rotation separation method cannot achieve disassembly, stop rotating the pipeline in the reverse direction and change to rotating the pipeline in the normal tightening direction. The pipeline will first squeeze the adjusting plate 202 through the upper ring 301, causing a part of the solder joint part 202b to be damaged under the downward pressure. At this time, the rigid connection between the adjusting plate 202 and the mounting plate 203 is removed. During the continuous downward rotation of the pipeline, it will contact the inclined part 202a, that is, the inclined part 202a is in extrusion contact with the pipeline. At this time, the whole adjusting plate 202 moves towards the middle of the inner wall of the outer cylinder 100 in an inclined direction. The width of the slot 203a is greater than the width of the horizontal part of the adjusting plate 202 to ensure the normal movement of the adjusting plate 202. During this period, the adjusting plate 202 is pushed towards the outer cylinder 100 through the inclined part 202a, and the adjusting plate 202 synchronously drives the threaded piece 201 through the fixing piece 202c, thereby realizing the preliminary separation of the threaded piece 201 from the pipeline;

[0044] Refer to Figure 4 , when the adjusting plate 202 is pushed by the pipeline and moves towards the inner wall of the outer cylinder 100, the whole adjusting plate 202 will move towards the middle area of the outer cylinder 100, that is, the position of the adjusting plate 202 towards the opening of the outer cylinder 100 will move towards the position inside the outer cylinder 100. At this time, the included angle area of the adjusting plate 202 gradually abuts against the guide rod 103. Specifically, refer to Figure 5 and Figure 6 , and under the limit of the guide rod 103, the adjusting plate 202 can force the upper area of the adjusting plate 202 to generate slight deformation, that is, the upper area of the adjusting plate 202 moves towards the inner wall of the outer cylinder 100. At this time, the threaded piece 201 fixed to the top of the adjusting plate 202 will also tilt towards the inner wall of the outer cylinder 100. With the drive of the fixing piece 202c, the whole threaded piece 201 moves closer to the outer cylinder 100. At this time, the separation of the threaded piece 201 from the pipeline can be achieved. Then, the separated pipeline can be directly pulled out or screwed out in both forward and reverse directions to complete the entire disassembly operation. At this time, the threaded piece 201 at the lower part of the outer cylinder 100 still maintains the normal connection with the lower pipeline and can be normally disassembled later.

[0045] Although the embodiments of the present invention have been shown and described (see the above detailed description), for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Cementing nipple device, comprising an outer cylinder (100), with an annular protrusion provided at the middle position of the inner wall; a convex ring (102) is also formed in the inner region of the annular protrusion; Characterized in that: There are two sets of connecting components (200), which are symmetrically arranged at the upper and lower ends inside the outer cylinder (100), and each set of connecting components (200) is equally angularly distributed around the axis of the outer cylinder (100); The connecting component (200) is composed of a threaded piece (201), an adjusting plate (202), and a mounting plate (203). Among them, the bottom of the mounting plate (203) is fixedly arranged on the annular protrusion, and the threaded piece (201) is arranged on the top of the mounting plate (203). The adjusting plate (202) is entirely located in the annular region between the threaded piece (201) and the outer cylinder (100), and the top end of the adjusting plate (202) is fixed to the top surface of the outer surface of the threaded piece (201), while the bottom end of the adjusting plate (202) passes through the mounting plate (203) through bending and extends horizontally towards the central region of the outer cylinder (100); the adjusting plate (202) is fixedly connected to the mounting plate (203) and the threaded piece (201); It further includes a sealing spacer (300); one end of the sealing spacer (300) is lapped on the convex ring (102), and the other end is located on the connecting component (200); A slot (203a) for the bottom of the adjusting plate (202) to penetrate is provided on the surface of the mounting plate (203). A welding point part (202b) is formed between the adjusting plate (202) and the top surface of the slot (203a). A fixing piece (202c) is also fixed on the inner side surface of the adjusting plate (202), and the fixing piece (202c) is fixed to the bottom region of the threaded piece (201). An inclined part (202a) that abuts against the external pipeline is formed on the end surface of the horizontal end of the adjusting plate (202); The adjusting plate (202) is an arc-shaped plate body with two unequal slopes as a whole, and a corner point is formed in the upper region of the adjusting plate (202). The corner point contacts the inner wall of the outer cylinder (100), and an arc-shaped guide rod (103) is provided in the included angle region formed by the corner point and the upper part of the threaded piece (201). The guide rod (103) contacts the outer wall of the threaded piece (201), and a fixing block (104) is fixed at one end of the guide rod (103), and the fixing block (104) is fixed on the inner wall of the outer cylinder (100).

2. The cementing nipple device according to claim 1, characterized in that: The sealing spacer (300) includes an upper ring (301), a lower ring (303), and partition blocks (302) equally angularly arranged between the two. The partition blocks (302) are located between every two adjacent connecting components (200) and abut against the side wall of the mounting plate (203). The lower ring (303) is located between the horizontal region of the adjusting plate (202) and the convex ring (102) and abuts against both of them respectively; the upper ring (301) is placed at the top position of the horizontal region of the adjusting plate (202).

3. The cementing nipple device according to claim 1, characterized in that: The inner wall of the mounting plate (203) is in a smooth curved surface shape, and the inner wall of the bottom of the threaded piece (201) has an inclined part that extends towards the inner wall of the outer cylinder (100).

4. The cementing nipple device according to claim 1, characterized in that: The initial state of the thread piece (201) and the mounting plate (203) is vertical, and the contact end face between the mounting plate (203) and the thread piece (201) is connected by a plane.

5. The cementing nipple device according to claim 1, characterized in that: The convex ring (102) is located at the middle position of the annular protrusion, and the inner diameter of the convex ring (102) is equal to the inner diameter of the sealing spacer (300).

6. The cementing nipple device according to claim 1, characterized in that: Sealing rubber rings (101) are further provided at both end faces of the outer cylinder (100), and the vertical projection of the sealing rubber ring (101) covers the vertical projection area of the entire thread piece (201).

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