Pipe end and pipe body double-seal threaded sleeve head suitable for multidirectional well conditions

Abstract

The invention relates to the technical field of connecting parts, and discloses a pipe end and pipe body double-seal threaded sleeve head suitable for multidirectional well conditions, the pipe end and pipe body double-seal threaded sleeve head comprises a threaded sleeve head and a pipe body, a connecting mechanism is arranged at the end, close to the threaded sleeve head, of the pipe body, a metal sealing piece is arranged in the threaded sleeve head, and the connecting mechanism comprises a threaded connector. The threaded connector is fixedly connected with the pipe body, and the threaded connector is in a circular truncated cone shape; the cone frustum sealing surface is arranged on the threaded connector; the ball sealing surface is arranged on the pipe body; the reinforcing assembly is arranged at the end, away from the pipe body, of the threaded connector. According to the sealing device, a first rigid sealing defensive line is formed through the cone frustum sealing face and the ball sealing face of the connecting mechanism, a fluid radial leakage channel is blocked by means of the attaching characteristic of the cone frustum-shaped threaded connector, the sealing effect of the sealing device is improved, and the sealing device meets the strict sealing requirements of complex well conditions such as a directional well and a horizontal well.

Description

Technical Field

[0001] This invention relates to the field of connecting component technology, and in particular to a double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions. Background Technology

[0002] The double-sealed threaded sleeve at both the pipe end and body, suitable for multi-directional well conditions, is a key connecting component in the oil and gas drilling and production field. Its core function is to achieve a reliable connection between the pipe end and the casing, while simultaneously preventing leakage of drilling fluid and formation fluids, and withstanding multi-directional composite loads such as downhole axial tension, radial pressure, and bending torque. Its application scenarios cover complex well conditions such as directional wells, horizontal wells, and ultra-deep wells.

[0003] Traditional joints often rely on a single thread seal or a single metal seal. Under multi-directional loads, the sealing surface is prone to relative sliding, leading to fluctuations in contact pressure. Especially under bending conditions, the sealing specific pressure drops significantly, and the probability of gas seal failure increases dramatically. At the same time, the expansion difference between steel and thread grease under high temperature environments will further weaken the contact pressure of the sealing surface and exacerbate the risk of leakage. To address these issues, a double-seal threaded sleeve for the pipe end and body, suitable for multi-directional well conditions, is proposed. Summary of the Invention

[0004] To overcome the above deficiencies, this invention provides a double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions. It aims to improve the problem that traditional pipe end and body threaded sleeves in the prior art rely on a single sealing structure. Under the combined loads of axial tension, radial pressure, and bending torque in multi-directional well conditions such as directional wells and horizontal wells, the sealing surface is prone to relative sliding, resulting in contact pressure fluctuations, a significant decrease in sealing specific pressure, and a substantial increase in the probability of gas seal failure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions, comprising a threaded sleeve and a pipe body, wherein a connecting mechanism is provided at one end of the pipe body near the threaded sleeve, and a metal sealing element is provided in the threaded sleeve, the connecting mechanism comprising: A threaded connector, which is fixedly connected to the pipe body, is frustum-shaped; A truncated cone sealing surface is provided on the threaded connector. A spherical sealing surface is provided on the pipe body; A reinforcing component is provided at the end of the threaded connector away from the pipe body. By connecting the threaded sleeve to the pipe body and the threaded connector to the threaded sleeve, after the threaded connector and the threaded sleeve are fully connected, the conical sealing surface and the inner wall of the threaded sleeve are tightly abutted, and the spherical sealing surface and the inner wall of the threaded sleeve are tightly abutted, forming a rigid seal.

[0006] As a further description of the above technical solution: The reinforcement component includes a connecting ring, a guide rod, and a connecting assembly. The connecting ring is fixedly connected to the guide rod, and the connecting assembly is located on the side of the connecting ring away from the guide rod.

[0007] As a further description of the above technical solution: The threaded connector has a groove on the side near the connecting ring, and a connecting spring is embedded in the groove and connected to the connecting ring. The guide rod is slidably connected to the groove. In the initial state of the connecting spring, the connecting ring and the threaded connector are separated. When the threaded connector is not fully threaded into the threaded sleeve, the rotation of the threaded connector will drive the connecting ring and the connecting assembly to rotate synchronously. After the connecting assembly abuts against the threaded sleeve, the threaded connector can continue to be connected into the threaded sleeve. The connecting spring is compressed until the connecting ring abuts against the threaded connector, so that the threaded connector can be fully connected into the threaded sleeve.

[0008] As a further description of the above technical solution: The connecting assembly includes a fixed ring, a slider, and an insert block. The fixed ring is rotatably connected to the connecting ring. The fixed ring has multiple sets of inner grooves, and the slider is slidably connected in the inner grooves. The insert block is fixedly connected to the slider, and the slider is elastically connected to the inner grooves by a return spring.

[0009] As a further description of the above technical solution: The threaded sleeve has a socket, and the edge of the socket and the end of the insert are both arc-shaped. The socket matches the insert. During the rotation of the fixed ring, when the insert is aligned with the socket, the insert is inserted into the socket under the action of the return spring. After the fixed ring abuts against the inner wall of the threaded sleeve, there is a large pressure, resulting in a large friction. As the threaded connector continues to rotate, the threaded connector can be fully inserted into the threaded sleeve.

[0010] As a further description of the above technical solution: The connecting ring has a notch.

[0011] As a further description of the above technical solution: The fixing ring has a protrusion elastically connected to the side near the notch.

[0012] As a further description of the above technical solution: The notch matches the protrusion, which is hemispherical. The connecting ring and the fixing ring rotate relative to each other, allowing the protrusion to move elastically into and out of the notch.

[0013] As a further description of the above technical solution: The metal seal is embedded in the threaded sleeve, and the metal seal is interference-fitted with the ball sealing surface.

[0014] As a further description of the above technical solution: The metal seal is elastic.

[0015] The present invention has the following beneficial effects: 1. In this invention, the first rigid sealing line is formed by the truncated cone sealing surface and the spherical sealing surface of the connecting mechanism. The fitting characteristics of the truncated cone threaded connector are used to block the radial leakage channel of the fluid and improve the sealing effect of the device.

[0016] 2. In this invention, by using a metal seal, the metal seal is interference-fitted with the ball sealing surface, and the metal seal tightly abuts against the ball sealing surface to form a good seal. With the help of the elasticity of the metal seal, it can adaptively deform to compensate for the small displacement of the sealing surface caused by multi-directional loads and high temperature, avoid contact pressure fluctuations, significantly reduce the risk of gas seal failure, and adapt to the stringent sealing requirements of complex well conditions such as directional wells and horizontal wells.

[0017] 3. In this invention, by using a connecting mechanism, before the threaded connector is fully threaded into the threaded sleeve, the rotation of the threaded connector will cause the connecting ring and the fixed ring to rotate synchronously. During the rotation of the fixed ring, when the insert block is aligned with the socket, the insert block is inserted into the socket under the action of the return spring. When the threaded connector continues to rotate, the connecting ring and the fixed ring will rotate relative to each other, ensuring that the threaded connector can be fully inserted into the threaded sleeve, thereby strengthening the connection between the threaded connector and the threaded sleeve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a double-sealed threaded sleeve for pipe end and pipe body suitable for multi-directional well conditions proposed in this invention. Figure 2 This is a partial three-dimensional structural diagram of a double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions proposed in this invention. Figure 3 This invention proposes a double-sealed threaded sleeve for the pipe end and body, suitable for multi-directional well conditions. Figure 2 Schematic diagram of structure A in the middle; Figure 4 This is a schematic diagram of a connection assembly structure for a double-sealed threaded sleeve at the pipe end and body, suitable for multi-directional well conditions, proposed in this invention. Figure 5 This is a partial cross-sectional view of a double-sealed threaded sleeve end for pipe body suitable for multi-directional well conditions proposed in this invention. Figure 6This invention proposes a double-sealed threaded sleeve for the pipe end and body, suitable for multi-directional well conditions. Figure 5 Schematic diagram of structure B in the middle; Figure 7 This is a schematic diagram of a connecting ring structure for a double-sealed threaded sleeve at the pipe end and body, suitable for multi-directional well conditions, as proposed in this invention. Figure 8 This is a schematic diagram of the fixing ring structure of a double-sealed threaded sleeve for pipe end and pipe body suitable for multi-directional well conditions proposed in this invention; Figure 9 This invention proposes a double-sealed threaded sleeve for the pipe end and body, suitable for multi-directional well conditions. Figure 5 Diagram of C in the middle.

[0019] Legend: 1. Threaded sleeve; 2. Pipe body; 3. Connecting mechanism; 4. Metal seal; 101. Socket; 31. Threaded connector; 32. Conical sealing surface; 33. Ball sealing surface; 34. Reinforcing component; 311. Groove; 341. Connecting ring; 342. Guide rod; 343. Connecting component; 3411. Notch; 3431. Retaining ring; 3432. Inner groove; 3433. Slider; 3434. Insert block; 3435. Protrusion. Detailed Implementation

[0020] 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.

[0021] Reference Figures 1-3 The present invention provides an embodiment of a double-sealed threaded sleeve for pipe end and pipe body suitable for multi-directional well conditions, comprising a threaded sleeve 1 and a pipe body 2, wherein a connecting mechanism 3 is provided at one end of the pipe body 2 near the threaded sleeve 1, and a metal sealing element 4 is provided in the threaded sleeve 1.

[0022] The connecting mechanism 3 includes a threaded connector 31, a frustum-shaped sealing surface 32, a spherical sealing surface 33, and a reinforcing component 34. The threaded connector 31 is fixedly connected to the pipe body 2. The threaded connector 31 is frustum-shaped. The frustum-shaped sealing surface 32 is disposed on the threaded connector 31, and the spherical sealing surface 33 is disposed on the pipe body 2. The reinforcing component 34 is disposed at the end of the threaded connector 31 away from the pipe body 2. By connecting the threaded sleeve 1 to the pipe body 2, the threaded connector 31 and the threaded sleeve 1 are threadedly connected. After the threaded connector 31 and the threaded sleeve 1 are fully connected, the frustum-shaped sealing surface 32 and the inner wall of the threaded sleeve 1 are tightly abutted, and the spherical sealing surface 33 and the inner wall of the threaded sleeve 1 are tightly abutted, forming a rigid seal, blocking the radial leakage channel of the fluid, and improving the sealing effect of the device.

[0023] Reference Figures 2-3 The reinforcing component 34 includes a connecting ring 341, a guide rod 342, and a connecting component 343. The connecting ring 341 is fixedly connected to the guide rod 342, and the connecting component 343 is located on the side of the connecting ring 341 away from the guide rod 342. By using the guide rod 342, the connecting ring 341 can move more stably when it moves away from or close to the threaded connector 31. The threaded connector 31 has a groove 311 on the side near the connecting ring 341. A connecting spring is embedded in the groove 311 and connected to the connecting ring 341. The guide rod 342 is slidably connected to the groove 311. In the initial state of the connecting spring, the connecting ring 341 is separated from the threaded connector 31. In this way, when the threaded connector 31 is not fully threaded into the threaded sleeve 1, the rotation of the threaded connector 31 will drive the connecting ring 341 and the connecting assembly 343 to rotate synchronously. After the connecting assembly 343 abuts against the threaded sleeve 1, the threaded connector 31 can continue to be connected into the threaded sleeve 1. The connecting spring is compressed until the connecting ring 341 abuts against the threaded connector 31, so that the threaded connector 31 can be fully connected into the threaded sleeve 1.

[0024] Reference Figure 4 , Figure 7 and Figure 8The connecting component 343 includes a retaining ring 3431, a slider 3433, and an insert 3434. The retaining ring 3431 is rotatably connected to the connecting ring 341. The retaining ring 3431 has multiple sets of inner grooves 3432, and the slider 3433 is slidably connected in the inner grooves 3432. The insert 3434 is fixedly connected to the slider 3433. The slider 3433 and the inner grooves 3432 are elastically connected by a return spring. The connecting ring 341 has a notch 3411. The side of the retaining ring 3431 near the notch 3411 is elastically connected to a protrusion 3435. The notch 3411 matches the protrusion 3435. The protrusion 3435 is hemispherical. Before the threaded connector 31 is fully threaded into the threaded sleeve 1, the protrusion 3435 is inserted into the notch 3431. In step 11, the rotation of the threaded connector 31 will cause the connecting ring 341 and the fixed ring 3431 to rotate synchronously. During the rotation of the fixed ring 3431, when the insert 3434 is aligned with the socket 101, the insert 3434 is inserted into the socket 101 under the action of the return spring. After the fixed ring 3431 abuts against the inner wall of the threaded sleeve 1, it has a large pressure and thus a large friction. When the threaded connector 31 continues to rotate, the connecting ring 341 and the fixed ring 3431 will rotate relative to each other, so that the protrusion 3435 can elastically move into and out of the recess 3411, ensuring that the threaded connector 31 can be fully inserted into the threaded sleeve 1, thereby strengthening the connection between the threaded connector 31 and the threaded sleeve 1.

[0025] Reference Figures 4-6 The threaded sleeve 1 has a socket 101. The edge of the socket 101 and the end of the insert 3434 are both arc-shaped. The socket 101 matches the insert 3434. In this way, it is easy for the insert 3434 to disengage from the socket 101, so as to separate the threaded sleeve 1 from the threaded connector 31.

[0026] Reference Figure 5 and Figure 9 The metal seal 4 is embedded in the threaded sleeve 1. The metal seal 4 is interference-fitted with the ball sealing surface 33. The metal seal 4 is elastic. Through the use of the metal seal 4, the metal seal 4 and the ball sealing surface 33 are interference-fitted, and the metal seal 4 tightly abuts against the ball sealing surface 33 to form a good seal. With the help of the elasticity of the metal seal 4, it can perform adaptive deformation to compensate for the small displacement of the sealing surface caused by multi-directional loads and high temperature, avoid contact pressure fluctuations, significantly reduce the risk of gas seal failure, and adapt to the stringent sealing requirements of complex well conditions such as directional wells and horizontal wells.

[0027] It should be noted that all standard parts used in this application can be purchased from the market, and the specific connection methods of each part are all conventional methods such as riveting and welding that are mature in the prior art. In addition, the standard parts are all conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art.

[0028] Working principle: In use, first align the threaded connector 31 at the end of the tube body 2 with the interface of the threaded sleeve 1, and rotate the tube body 2 to screw the threaded connector 31 into the threaded sleeve 1. At this time, the protrusion 3435 on the fixing ring 3431 is embedded in the recess 3411 of the connecting ring 341. The rotation of the threaded connector 31 will synchronously drive the connecting ring 341, the guide rod 342 and the fixing ring 3431 to rotate together. The guide rod 342 slides along the groove 311 to ensure smooth rotation.

[0029] As the threaded connector 31 continues to screw in, the retaining ring 3431 advances synchronously. When the insert 3434 aligns with the socket 101 of the threaded sleeve 1, the return spring in the inner groove 3432 releases its elastic force, pushing the slider 3433 to slide, allowing the insert 3434 to be precisely inserted into the socket 101. Continuing to rotate the tube body 2, the retaining ring 3431 abuts tightly against the inner wall of the threaded sleeve 1, increasing friction. As the threaded connector 31 rotates subsequently, the connecting ring 341 and the retaining ring 3431 rotate relative to each other. The protrusion 3435 elastically moves out of the recess 3411 and periodically engages and disengages with the rotation. Simultaneously, the connecting spring is compressed, and the guide rod 342 slides continuously along the groove 311 until the connecting ring 341 and the threaded connector 31 are fully engaged, and the threaded connector 31 is screwed into place.

[0030] After the threaded connector 31 is fully connected, the conical sealing surface 32 abuts tightly against the inner wall of the threaded sleeve 1, and the ball sealing surface 33 simultaneously fits against the inner wall of the threaded sleeve 1, forming the first rigid seal and blocking the radial leakage channel of the fluid. At the same time, through the use of the metal seal 4, the metal seal 4 and the ball sealing surface 33 are interference fit, and the metal seal 4 abuts tightly against the ball sealing surface 33 to form a good seal. With the help of the elastic effect of the metal seal 4, it can perform adaptive deformation to compensate for the small displacement of the sealing surface caused by multi-directional loads and high temperature.

[0031] In multi-directional well conditions such as directional and horizontal wells, when the joint is subjected to axial tension, radial pressure, and bending torque, the locking structure of the insert 3434 of the reinforcing component 34 and the socket 101 can prevent the threaded connector 31 from sliding relative to the threaded sleeve 1, and the preload of the connecting spring further disperses the load; the metal seal 4 continuously maintains the stability of the sealing pressure through elastic deformation, avoiding contact pressure fluctuations, and the dual seals work together to ensure no leakage.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions, comprising a threaded sleeve (1) and a pipe body (2), characterized in that: The tube body (2) is provided with a connecting mechanism (3) at one end near the threaded sleeve (1), and a metal seal (4) is provided in the threaded sleeve (1). The connecting mechanism (3) includes: A threaded connector (31) is fixedly connected to the pipe body (2), and the threaded connector (31) is frustoconical. A truncated cone sealing surface (32) is provided on the threaded connector (31); A ball sealing surface (33) is provided on the pipe body (2); A reinforcing component (34) is provided at the end of the threaded connector (31) away from the pipe body (2).

2. The double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 1, characterized in that: The reinforcement component (34) includes a connecting ring (341), a guide rod (342), and a connecting component (343). The connecting ring (341) is fixedly connected to the guide rod (342), and the connecting component (343) is disposed on the side of the connecting ring (341) away from the guide rod (342).

3. A double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 2, characterized in that: The threaded connector (31) has a groove (311) on the side near the connecting ring (341). A connecting spring is embedded in the groove (311) and is connected to the connecting ring (341). The guide rod (342) is slidably connected to the groove (311). In the initial state of the connecting spring, the connecting ring (341) is separated from the threaded connector (31).

4. A double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 2, characterized in that: The connecting assembly (343) includes a fixing ring (3431), a slider (3433), and an insert (3434). The fixing ring (3431) is rotatably connected to the connecting ring (341). The fixing ring (3431) has multiple sets of inner grooves (3432), and the slider (3433) is slidably connected in the inner groove (3432). The insert (3434) is fixedly connected to the slider (3433), and the slider (3433) is elastically connected to the inner groove (3432) through a return spring.

5. A double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 4, characterized in that: The threaded sleeve (1) has a socket (101) with the edge of the socket (101) and the end of the plug (3434) being arc-shaped, and the socket (101) and the plug (3434) are matched.

6. A double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 4, characterized in that: The connecting ring (341) has a notch (3411).

7. A double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 6, characterized in that: The fixing ring (3431) has a protrusion (3435) elastically connected to the side near the notch (3411).

8. A double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 7, characterized in that: The notch (3411) matches the protrusion (3435), which is hemispherical.

9. A double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 1, characterized in that: The metal seal (4) is embedded in the threaded sleeve (1), and the metal seal (4) is interference-fitted with the ball sealing surface (33).

10. A double-sealed threaded sleeve for pipe end and body suitable for multi-directional well conditions according to claim 9, characterized in that: The metal seal (4) is elastic.

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