Rotatable pressing joint

Abstract

The invention provides a rotatable pressing connector, and relates to the technical field of oil and gas well exploitation equipment.The rotatable pressing connector comprises a sealing rod and a rotating sleeve assembly, the rotating sleeve assembly is provided with a cylindrical rotating sleeve body, the rotating sleeve body is arranged outside the sealing rod in a sleeving mode and is in sealing running fit with the sealing rod, and the sealing rod is provided with a flow guide cavity penetrating in the axial direction; the outer side wall of the sealing rod is provided with a flow guide ring groove which is formed in the circumferential direction and matched with the rotating sleeve assembly in an aligned mode, the side wall of the rotating sleeve body is provided with a flow guide opening communicated with the flow guide ring groove, the flow guide opening is externally connected with an elbow pipe, the sealing rod is further provided with a pressure transmission hole, and one end of the pressure transmission hole is opened in the inner wall of the sealing rod. And the other end of the pressure transmission hole is opened at the bottom of the flow guide ring groove. According to the rotatable pressing connector, a pressing pipeline can be effectively prevented from being wound on a pressing pipe column, and damage to the pressing pipeline is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well production equipment, and particularly relates to a rotatable pressure application joint. Background Art

[0002] With the rapid development of shale oil and gas, shale oil and gas wells that have been exploited for a period of time gradually show typical production characteristics of large production decline amplitude and fast production decline. To solve the above problems, it is necessary to lower high-performance expansion pipes into shale oil and gas horizontal wells. Under the action of hydraulic pressure and mechanical force, the expansion pipes expand underground to seal the primary fracturing perforation section, reconstruct the wellbore integrity, provide good wellbore conditions for the refracturing technology, and subsequent re-perforation and fracturing can be carried out in the new wellbore according to the development requirements to realize the secondary development of shale oil and gas wells.

[0003] During the underground expansion operation, the inner pipe string connected to the expansion cone generally consists of tubing and drill pipes. A pressure application joint is installed on the inner pipe string, and the pressure application joint is then connected to a pressure application pipeline to carry out the pressure application and expansion of the expansion pipe. Since the position of the pressure application pipeline is fixed, when using a conventional pressure application joint, the pressure application pipeline often rotates and winds with the inner pipe string during the uncoupling process. It is only necessary to disassemble the pressure application pipeline in advance before each uncoupling. However, after the inner pipe string is lifted out of the wellhead each time, the pressure application joint is often at a high altitude, increasing the difficulty and safety risk of its disassembly. In addition, there may still be residual pressure in the pressure application pipeline, which also poses a safety hazard to the disassembly.

[0004] In view of this, based on years of production design experience in this field and related fields, the inventor of the present invention has designed a rotatable pressure application joint through repeated tests in order to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a rotatable pressure application joint, which can effectively prevent the pressure application pipeline from winding around the pressure application pipe string and avoid damage to the pressure application pipeline.

[0006] To achieve the above purpose, the present invention provides a rotatable pressure application joint. Among them, the rotatable pressure application joint includes a sealing rod and a rotating sleeve assembly. The rotating sleeve has a cylindrical rotating sleeve body. The rotating sleeve body is sleeved outside the sealing rod and is in sealed rotational cooperation with the sealing rod. The sealing rod has a diversion cavity that penetrates axially. The outer side wall of the sealing rod has a diversion ring groove that is opened in the circumferential direction and is in alignment and cooperation with the rotating sleeve assembly. The side wall of the rotating sleeve body is provided with a diversion port that communicates with the diversion ring groove. An elbow pipe is connected outside the diversion port. A pressure transmission hole is also opened on the sealing rod. One end of the pressure transmission hole opens at the inner wall of the sealing rod, and the other end of the pressure transmission hole opens at the bottom of the diversion ring groove.

[0007] Compared with the prior art, the present invention has the following features and advantages:

[0008] For the rotatable pressure application joint proposed by the present invention, its sealing rod can be connected to the pressure application pipe string, and the elbow pipe on the rotating sleeve assembly can be connected to the high-pressure pipeline, so as to divert the high-pressure fluid in the high-pressure pipeline into the pressure application pipe string for the expansion pipe pressure application effect. Moreover, the sealing rod and the rotating sleeve body are in sealed rotational cooperation, the sealing rod can rotate synchronously with the pressure application pipe string, while the rotating sleeve assembly can remain in a relatively static state, avoiding the entanglement of the high-pressure pipeline connected to the elbow pipe, reducing the construction safety hazards, and improving the operation efficiency. At the same time, the rotatable pressure application joint is connected to the high-pressure pipeline through the elbow pipe, avoiding the bending of the high-pressure pipeline, improving the service life of the high-pressure pipeline, and solving the problem of frequent disassembly and replacement of the high-pressure pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can, under the teachings of the present invention, select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention.

[0010] Figure 1 is a schematic structural diagram of the rotatable pressure application joint proposed by the present invention;

[0011] Figure 2 is a schematic structural diagram of the anti-rotation mechanism in the present invention.

[0012] DESCRIPTION OF THE REFERENCE NUMERALS

[0013] 100, rotatable pressure application joint; 10, sealing rod;

[0014] 11, diversion cavity; 12, diversion ring groove;

[0015] 13, pressure transmission hole; 14, limit step;

[0016] 20, rotating sleeve assembly; 21, diversion port;

[0017] 22, elbow pipe; 23, pipeline joint;

[0018] 24, first sealing ring; 25, bearing;

[0019] 26, second sealing ring; 30, compression nut;

[0020] 40, adjusting washer; 50, circlip;

[0021] 60. Anti-rotation mechanism; 61. Mounting ring;

[0022] 62. Connecting rod; 63. Pin;

[0023] 70. Pressure sensor. DETAILED DESCRIPTION

[0024] The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should all be considered to belong to the scope of the present invention.

[0025] like Figure 1 As shown, the present invention proposes a rotatable pressure joint 100, which includes a sealing rod 10 and a rotating sleeve assembly 20. The rotating sleeve assembly 20 has a cylindrical rotating sleeve body, which is sleeved outside the sealing rod 10 and cooperates with the sealing rod 10 in a sealing and rotating manner. The sealing rod 10 has a guide cavity 11 that passes through the axial direction, and the outer wall of the sealing rod 10 has a guide ring groove 12 that is opened along the circumferential direction and is aligned with the rotating sleeve body. The side wall of the rotating sleeve body is provided with a guide port 21 that is connected to the guide ring groove 12, and the guide port 21 is connected to an elbow pipe 22. The sealing rod 10 is also provided with a pressure transmission hole 13, one end of the pressure transmission hole 13 is opened to the inner wall of the sealing rod 10, and the other end of the pressure transmission hole 13 is opened to the bottom of the guide ring groove 12.

[0026] The rotatable pressure-pressing joint 100 proposed by the present invention has a sealing rod 10 that can be connected to the pressure-pressing pipe column, and the elbow pipe 22 on the rotating sleeve assembly 20 can be connected to the high-pressure pipeline, thereby diverting the high-pressure fluid in the high-pressure pipeline to the pressure-pressing pipe column to perform the expansion pipe pressure action, and the sealing rod 10 and the rotating sleeve body are sealed and rotated in cooperation, the sealing rod 10 can rotate synchronously with the pressure-pressing pipe column, and the rotating sleeve assembly 20 can remain in a relatively static state, avoiding the entanglement of the high-pressure pipeline connected to the elbow pipe 22, reducing construction safety hazards, and improving work efficiency. At the same time, the rotatable pressure-pressing joint 100 is connected to the high-pressure pipeline through the elbow pipe 22, avoiding the bending of the high-pressure pipeline, increasing the service life of the high-pressure pipeline, and solving the problem of frequent disassembly and replacement of the high-pressure pipeline.

[0027] In an optional embodiment of the present invention, one end of the elbow pipe 22 is fixed to the rotating sleeve body, and the other end of the elbow pipe 22 is sealed and connected to a pipeline joint 23. The pipeline joint 23 is a high-pressure resistant pipeline joint 23 and can be quickly connected to a high-pressure pipeline to improve operating efficiency.

[0028] Further, the pipeline joint 23 is threadedly connected to the elbow pipe 22, and a first sealing ring 24 is also provided between the pipeline joint 23 and the elbow pipe 22.

[0029] In an alternative example of this embodiment, the elbow pipe 22 and the rotating sleeve body are integrally formed.

[0030] In an alternative embodiment of the present invention, bearings 25 are respectively provided at both ends of the rotating sleeve body and are rotationally engaged with the sealing rod 10 through the bearings 25. A second sealing ring 26 is further provided between the rotating sleeve body and the sealing rod 10, and the second sealing ring 26 is located between the bearing 25 and the diversion ring groove 12.

[0031] Preferably, the bearing 25 is a tapered roller bearing to achieve the rotational engagement between the rotating sleeve body and the sealing rod 10.

[0032] In an alternative example of this embodiment, the rotatable pressure connection 100 further includes a compression nut 30 for installing the rotating sleeve assembly 20. A limiting step 14 is provided on the sealing rod 10 for mating with the compression nut 30. The limiting step 14 and the compression nut 30 are respectively located at both ends of the rotating sleeve body and are respectively in contact with the inner ring of the bearing 25. The compression nut 30 is threadedly engaged with the sealing rod 10. With the above structure, during installation, first, the rotating sleeve body is sleeved on the sealing rod 10 and abutted against the limiting step 14, and then the compression nut 30 is sleeved and tightened on the sealing rod 10, thereby realizing the quick installation of the rotating sleeve assembly 20.

[0033] In an alternative example, an adjusting washer 40 is further provided between the compression nut 30 and the adjacent bearing 25.

[0034] In an alternative example, the rotatable pressure connection 100 further includes an anti-rotation mechanism 60. The anti-rotation mechanism 60 has an installation ring 61 and two connecting rods 62. The installation ring 61 is detachably sleeved outside the rotating sleeve body. The two connecting rods 62 are symmetrically arranged on opposite sides of the installation ring 61. One end of the connecting rod 62 is fixedly connected to the outer edge of the installation ring 61, and the other end of the connecting rod 62 extends radially outward along the installation ring 61. The wellhead device limits the rotating sleeve assembly 20 through the connecting rod 62, further ensuring that the rotating sleeve assembly 20 does not rotate with the sealing rod 10.

[0035] In an alternative embodiment of the present invention, please refer to Figure 2 , the rotatable pressure connection 100 further includes an anti-rotation mechanism 60. The anti-rotation mechanism 60 has an installation ring 61 and two connecting rods 62. The installation ring 61 is detachably sleeved outside the rotating sleeve body. The two connecting rods 62 are symmetrically arranged on opposite sides of the installation ring 61. One end of the connecting rod 62 is fixedly connected to the outer edge of the installation ring 61, and the other end of the connecting rod 62 extends radially outward along the installation ring 61. The wellhead device limits the rotating sleeve assembly 20 through the connecting rod 62, further ensuring that the rotating sleeve assembly 20 does not rotate with the sealing rod 10.

[0036] In an alternative embodiment of the present invention, a plurality of pressure transmission holes 13 are formed in the sealing rod 10, and the plurality of pressure transmission holes 13 are evenly distributed along the circumferential direction of the sealing rod 10. With the above structure, the diversion cavity 11, the pressure transmission holes 13, the diversion ring groove 12 and the diversion port 21 are sequentially connected to form a high-pressure passage for diverting high-pressure fluid for expansion and pressure application.

[0037] In an alternative embodiment of the present invention, a male thread that can be connected to a pressure application pipe string is provided at one end of the sealing rod 10, and a pressure sensor 70 is installed at the other end of the sealing rod 10. The pressure sensor 70 monitors the pressure in the diversion cavity 11 and seals the diversion cavity 11. During the expansion operation, the pressure sensor 70 can monitor the pressure value in the diversion cavity 11 (high-pressure passage), and can also set a maximum pressure limit. When the working pressure exceeds the maximum pressure, an alarm is issued, and the operator can choose to suspend the operation according to the actual situation.

[0038] Please refer to Figure 1 、 Figure 2 , and the specific structure and implementation manner of the rotatable pressure application joint 100 proposed by the present invention will be described in detail in conjunction with an embodiment.

[0039] In this embodiment, the rotatable pressure application joint 100 is composed of a sealing rod 10, a rotating sleeve assembly 20, a second sealing ring 26 (axial), a first sealing ring 24 (radial), a pipeline joint 23, an anti-rotation mechanism 60, a pin 63, a bearing 25, an adjusting washer 40, a compression nut 30, a snap ring 50 and a pressure sensor 70. Two planes are milled on the upper shaft of the sealing rod 10, and four planes are milled on the upper end of the male thread at the lower end of the sealing rod 10 for use with a pipe wrench, and four pressure transmission holes 13 are evenly distributed in the middle of the sealing rod 10.

[0040] During installation, the sealing rod 10 is sleeved into the rotating sleeve body. The bearing 25 (tapered roller bearing) is installed at both ends of the rotating sleeve body, and an O-shaped second sealing ring 26 is installed between the sealing rod 10 and the rotating sleeve body. The adjusting washer 40 is installed behind the rotating sleeve body, and the compression nut 30 is threadedly connected to the sealing rod 10 behind the adjusting washer 40. The snap ring 50 (shaft snap ring) is fixed behind the compression nut 30 to prevent unthreading. The rotating sleeve assembly 20 has a downward elbow pipe 22 (when the pressure application joint is installed vertically, the pressure sensor 70 is upward, the male thread end of the sealing rod 10 is downward, and the elbow pipe 22 is downward). The elbow pipe 22 is threadedly connected to the pipeline joint 23, and the first sealing ring 24 is installed in the middle. After the elbow pipe 22 is connected to the high-pressure pipeline downward, the high-pressure pipeline will not be bent during the expansion operation when the drill string is lifted, improving the reliability of safe operation. The installation ring 61 of the anti-rotation mechanism 60 is sleeved into the rotating sleeve body and fixed in position by the pin 63. The installation ring 61 and the connecting rod 62 are connected by threads. The anti-rotation mechanism 60 can fix the entire rotatable pressure application joint 100 to prevent the whole from rotating when the pipe string is disassembled.

[0041] A pressure sensor 70 is installed at the upper end of the sealing rod 10, which can monitor the pressure value in the high-pressure passage during the expansion operation, and can also set the maximum pressure limit. When the working pressure exceeds the maximum pressure, an alarm is issued, and the operator can choose to suspend the operation according to the actual situation.

[0042] The rotatable pressure connection 100 proposed by the present invention is supported by a bearing mechanism between the sealing rod 10 and the rotating sleeve assembly 20. In this way, the rotating sleeve assembly 20 will not rotate during the rotation of the sealing rod 10. During the process of releasing the connection of the pressure pipe string, the high-pressure pipeline (pressure pipeline) will not rotate together with the disassembled pipe string and will not be wound around the pressure pipe string. There is no need to frequently disassemble the pressure pipeline, which improves the sealing performance between the pressure pipeline and the pipeline connection, can reduce the workload, improve the operation efficiency, and reduce the safety risk.

[0043] For the rotatable pressure connection 100 proposed by the present invention, the design of the elbow pipe 22 on the rotating sleeve assembly 20 can prevent the connected high-pressure pipeline from bending during operation, reduce the damage of high-pressure fluid to the pipeline, and improve the safety of the expansion operation.

[0044] For the rotatable pressure connection 100 proposed by the present invention, a pressure sensor 70 can be installed at the upper end of the sealing rod 10. The pressure sensor 70 can monitor the fluid pressure during the expansion operation and can alarm if an abnormal high pressure exceeds the set safety value.

[0045] Regarding the detailed explanations of the above various embodiments, their purposes are only to explain the present invention so as to better understand the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there are clear and opposite descriptions, these features should be understood to be applicable to any one of the embodiments and not limited to the described embodiments only.

Claims

1. A rotatable pressure joint, It is characterized in that The rotatable pressure joint includes a sealing rod and a rotating sleeve assembly, wherein the rotating sleeve has a cylindrical rotating sleeve body, which is sleeved outside the sealing rod and cooperates with the sealing rod in a sealing and rotating manner, the sealing rod has a guide cavity which passes through in the axial direction, the outer side wall of the sealing rod has a guide ring groove which is opened in the circumferential direction and cooperates with the rotating sleeve assembly, the side wall of the rotating sleeve body is provided with a guide port which is connected to the guide ring groove, an elbow pipe is connected to the outside of the guide port, and a pressure transmission hole is also provided on the sealing rod, one end of the pressure transmission hole opens to the inner wall of the sealing rod, and the other end of the pressure transmission hole opens to the bottom of the guide ring groove.

2. The rotatable pressure joint according to claim 1, It is characterized in that One end of the elbow pipe is fixedly connected to the rotating sleeve body, and the other end of the elbow pipe is sealed and connected to a pipeline joint.

3. The rotatable pressure joint according to claim 1, It is characterized in that The elbow pipe and the rotating body are formed in one piece.

4. The rotatable pressure joint according to claim 1, It is characterized in that Bearings are respectively arranged at both ends of the rotating sleeve body and are rotatably matched with the sealing rod through the bearings. A sealing ring is also arranged between the rotating sleeve body and the sealing rod, and the sealing ring is located between the bearing and the guide ring groove.

5. The rotatable pressure joint according to claim 4, It is characterized in that The rotatable pressing joint also includes a clamping nut for installing the rotating sleeve body. The sealing rod is provided with a limiting step that matches with the clamping nut. The limiting step and the clamping nut are respectively located at two ends of the rotating sleeve body and respectively abut against the inner ring of the bearing. The clamping nut is threadedly matched with the sealing rod.

6. The rotatable pressure joint according to claim 5, It is characterized in that An adjusting washer is also arranged between the clamping nut and the adjacent bearing.

7. The rotatable pressure joint according to claim 5, It is characterized in that The rotatable pressing joint further comprises an elastic retaining ring, which is sleeved outside the sealing rod and blocks an end of the compression nut away from the rotating sleeve body.

8. The rotatable pressure joint according to claim 1, It is characterized in that The rotatable pressing joint also includes an anti-rotation mechanism, which has a mounting ring and a connecting rod. The mounting ring is detachably mounted on the rotating sleeve body, one end of the connecting rod is fixedly connected to the outer edge of the mounting ring, and the other end of the connecting rod extends outward radially along the mounting ring.

9. The rotatable pressure joint according to claim 1, It is characterized in that One end of the sealing rod has a male buckle for connecting with a pressure column, and the other end of the sealing rod is connected with a pressure sensor, which monitors the pressure in the diversion cavity and closes the diversion cavity accordingly.

10. The rotatable pressure joint according to claim 1, It is characterized in that A plurality of the pressure transmission holes are formed in the sealing rod, and the plurality of the pressure transmission holes are uniformly distributed along the circumferential direction of the sealing rod.

Images