Air-tight seal leak detection tool for oil casing

Abstract

The utility model discloses an oil casing air-tight seal leak detection tool, which comprises a leak detection main body, a first sealing assembly, a second sealing assembly and a first detection port, and is characterized in that the leak detection main body is internally provided with a first air channel; a first moving area and a second moving area are arranged on the leak detection main body at intervals in a range corresponding to the first gas channel; the first sealing assembly and the second sealing assembly respectively correspond to the first moving area and the second moving area and can respectively reciprocate along the axial direction of the leak detection main body; a first space is formed between the first moving area and the first sealing assembly, and a second space is formed between the second moving area and the second sealing assembly; the first space and the second space are inflated and pressurized through the first gas channel, the first sealing assembly and the second sealing assembly move oppositely and deform to increase the radial size so as to abut against the inner wall of the sleeve, and a third space is formed between the first sealing assembly and the second sealing assembly; the first detection port is communicated with the first gas channel between the first moving area and the second moving area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole tools for oil and gas production, in particular to a casing gas seal leak detection tool. BACKGROUND

[0002] The gas seal detection technology plays a vital role in the oil and gas industry, which ensures the safety and efficiency of the oil and gas transportation process; with the continuous progress of oil and gas exploration technology, non-standard size casings are increasingly widely used in modern oil and gas wells, and the traditional gas seal detection tool has a complex structure and a cumbersome detection process of inflation and pressurization.

[0003] Further, in order to meet the growing market demand, improve the efficiency of detection work and simplify the gas seal detection process, the development of new gas seal detection tools is particularly urgent. CONTENT OF THE INVENTION

[0004] The present application provides a casing gas seal leak detection tool to solve the problem that the existing gas seal leak detection tool is only for standard casings and has a complex structure and a cumbersome detection process.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] The present application provides a casing gas seal leak detection tool, which comprises:

[0007] A leak detection main body, a hollow area is provided in the leak detection main body from the first end to a specified position along the axial direction thereof, forming a first gas passage; a first moving area and a second moving area are provided on the outer wall of the leak detection main body corresponding to the range of the first gas passage;

[0008] A first sealing assembly and a second sealing assembly, the first sealing assembly and the second sealing assembly are movably connected to the leak detection main body corresponding to the first moving area and the second moving area respectively; the first sealing assembly and the second sealing assembly can reciprocate along the axial direction of the leak detection main body in the first moving area and the second moving area respectively; a first space is formed between the first moving area and the first sealing assembly, and a second space is formed between the second moving area and the second sealing assembly;

[0009] The first gas passage is connected with the first space and the second space, and when the first gas passage is inflated and pressurized, the first sealing assembly and the second sealing assembly move away from each other and increase in radial size to abut against the inner wall of the casing, so as to form a third space between the first sealing assembly and the second sealing assembly;

[0010] A first detection port is located between the first moving area and the second moving area, and is in communication with the first gas channel, and is used to inflate the third space.

[0011] In some modified embodiments of the present application, the aforementioned oil casing gas seal leak detection tool further comprises a second detection port;

[0012] The second detection port is located between the first moving area and the second moving area and is spaced apart from the first detection port, and is in communication with the first gas channel, and is used to relieve pressure from the third space to the outside of the leak detection body through the first gas channel.

[0013] In some modified embodiments of the present application, the aforementioned oil casing gas seal leak detection tool, wherein the first moving area and the second moving area are respectively provided with a first spacing area and a second spacing area, and the inner wall of the first sealing assembly and the first spacing area are spaced apart to form the first space, and the inner wall of the second sealing assembly and the second spacing area are spaced apart to form the second space;

[0014] The first spacing area and the second spacing area are provided with a gas outlet, and the gas outlet is in communication with the first gas channel.

[0015] In some modified embodiments of the present application, the aforementioned oil casing gas seal leak detection tool, wherein the first sealing assembly comprises a first sliding sleeve and a first rubber tube;

[0016] The first sliding sleeve and the first rubber tube are sequentially arranged in the axial direction of the leak detection body away from the second sealing assembly, and the first sliding sleeve and the leak detection body form the first space;

[0017] The second sealing assembly is the same structure as the first sealing assembly.

[0018] In some modified embodiments of the present application, the aforementioned oil casing gas seal leak detection tool, wherein the leak detection body comprises an upper part and a lower part;

[0019] The upper part comprises a first body shaft, and the axial ends of the first body shaft are respectively provided with a first shaft body and a second shaft body, and the diameters of the first shaft body and the second shaft body are smaller than the diameter of the first body shaft; the first gas channel simultaneously penetrates the first shaft body, the first body shaft and the second shaft body;

[0020] The lower part comprises a second main shaft, a first end of the second main shaft is provided with a connecting groove for screwing the first shaft body; a second end of the second main shaft is connected with a third shaft body, the third shaft body has a smaller diameter than the second main shaft; the first gas channel penetrates the area between the connecting groove and the third shaft body;

[0021] The first moving area comprises a part of the first main shaft and a part of the second shaft body; the second moving area comprises a part of the second main shaft and a part of the third shaft body.

[0022] In some modified embodiments of the present application, the oil casing gas seal leak detection tool, wherein the connecting part of the first main shaft and the second shaft body, and the connecting part of the second main shaft and the third shaft body are provided with gas outlets.

[0023] In some modified embodiments of the present application, the oil casing gas seal leak detection tool, wherein the first end of the first main shaft towards the second shaft body is provided with a first sealing member around the axial direction of the first main shaft, the second shaft body is provided with a second sealing member around the axial direction of the second shaft body on the side of the gas outlet away from the first main shaft, the first sealing member and the second sealing member abut the inner wall of the first sealing assembly, and the first space is formed between the first sealing member and the second sealing member.

[0024] The second main shaft is provided with a third sealing member around the axial direction of the second main shaft towards the third shaft body, the third shaft body is provided with a fourth sealing member around the axial direction of the third shaft body on the side of the gas outlet away from the third shaft body, the third sealing member and the fourth sealing member abut the inner wall of the second sealing assembly, and the second space is formed between the third sealing member and the fourth sealing member.

[0025] In some modified embodiments of the present application, the oil casing gas seal leak detection tool, wherein at least one buffer groove is provided on the second main shaft between the connecting groove and the third shaft body, and the buffer groove is in communication with the connecting groove.

[0026] In some modified embodiments of the present application, the oil casing gas seal leak detection tool, wherein the first detection port and the second detection port are respectively provided with a first one-way valve and a second one-way valve, and the through directions of the first one-way valve and the second one-way valve are opposite.

[0027] In some modified embodiments of the present application, the oil casing gas seal leak detection tool further comprises a joint, a first cap, a second cap and a lead angle.

[0028] The first sealing cap and the joint are sequentially arranged on the side of the first sealing assembly away from the second sealing assembly, and the joint is provided with a through hole for connecting the first gas passage;

[0029] The second sealing cap and the guide are sequentially arranged on the side of the second sealing assembly away from the first sealing assembly.

[0030] Compared with the prior art, the oil casing gas seal leak detection tool provided by the application sets movable first and second sealing assemblies outside the leak detection body, fills the first and second spaces with gas through the first gas passage to drive the first and second sealing assemblies to move and deform to increase the radial size, and then when the leak detection tool works inside the pipeline, the first and second sealing assemblies can be located on the two sides of the connection to abut against the inner wall of the pipeline to form a third space, and then the first detection port is used to fill the third space with gas to detect the gas tightness of the connection; the overall structure is simple and the detection process is simple, and only the first gas passage is needed to fill the detection tool with gas. Thus, the problem of the prior art that the gas seal leak detection tool is only suitable for standard oil casings and has a complex structure and a tedious detection process is solved. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like or corresponding elements refer to like or corresponding parts throughout the several views, in which:

[0032] Figure 1 A structural schematic diagram of the oil casing gas seal leak detection tool provided by the present embodiment is schematically shown;

[0033] Figure 2 A structural schematic diagram of the oil casing gas seal leak detection tool provided by the present embodiment in a detection state is schematically shown;

[0034] Figure 3 A structural schematic diagram of the upper part of the oil casing gas seal leak detection tool provided by the present embodiment is schematically shown;

[0035] Figure 4 A structural schematic diagram of the lower part of the oil casing gas seal leak detection tool provided by the present embodiment is schematically shown;

[0036] Figure 5 A radial cross-sectional schematic diagram of the lower part provided by the present embodiment is schematically shown;

[0037] Figure 6 A structural diagram of the first sliding sleeve in the first sealing assembly of the oil casing gas seal leak detection tool provided by the present embodiment is schematically shown;

[0038] Figure 7 A structure diagram of a first rubber sleeve in a first sealing assembly of the oil casing gas sealing leak detection tool is shown schematically;

[0039] Figure 8 A structure diagram of a joint of the oil casing gas sealing leak detection tool is shown schematically;

[0040] Figure 9 A structure diagram of a lead-in of the oil casing gas sealing leak detection tool is shown schematically;

[0041] Figure 10 A structure diagram of a first cap of the oil casing gas sealing leak detection tool is shown schematically;

[0042] Brief Description of the Drawings: first sealing assembly 1, first space 11, second space 12, third space 13, gas outlet 14, first sliding sleeve 15, first rubber sleeve 16, hard ring 17, second sealing assembly 2, second sliding sleeve 21, second rubber sleeve 22, first detection port 3, second detection port 31, first one-way valve 32, second one-way valve 33, first gas passage 4, joint 5, through hole 51, first cap 6, second cap 7, lead-in 8, upper part 9, first main shaft 91, first shaft body 92, second shaft body 93, first sealing member 94, second sealing member 95, lower part 10, second main shaft 101, connecting groove 102, third shaft body 103, third sealing member 104, fourth sealing member 105, buffer groove 106, first moving area a, second moving area b. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and so that the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0044] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the common meanings understood by those skilled in the art to which the present application belongs.

[0045] The technical solutions of the embodiments of the present application are to solve the above technical problems, and the general idea is as follows:

[0046] Embodiment 1

[0047] Reference is made to the accompanying drawings Figure 1 and the accompanying drawings Figure 2The oil casing gas seal leak detection tool provided by the embodiment comprises a leak detection body, a first sealing assembly 1, a second sealing assembly 2 and a first detection port 3. A hollow area is arranged in the leak detection body from the first end to a specified position along the axial direction of the leak detection body, forming a first gas passage 4. First and second moving areas a and b are arranged on the outer wall of the leak detection body at intervals corresponding to the first gas passage 4. The first and second sealing assemblies 1 and 2 are movably sleeved on the leak detection body corresponding to the first and second moving areas a and b, respectively. The first and second sealing assemblies a and b can reciprocate along the axial direction of the leak detection body in the first and second moving areas a and b, respectively. A first space 11 is formed between the first moving area a and the first sealing assembly 1, and a second space 12 is formed between the second moving area b and the second sealing assembly 2. The first gas passage 4 is connected to the first and second spaces 11 and 12. When the first and second spaces 11 and 12 are inflated and pressurized through the first gas passage 4, the first and second sealing assemblies 1 and 2 move away from each other and increase in radial size to abut against the inner wall of the casing, so as to form a third space 13 between the first and second sealing assemblies 1 and 2.

[0048] The first detection port 3 is located between the first and second moving areas a and b and is connected to the first gas passage 4, so as to exhaust the third space 13.

[0049] It can be understood that, in order to solve the problems of the existing gas seal leak detection tool, which is only applicable to standard oil casings and has a complex structure and a tedious detection process, the oil casing gas seal leak detection tool provided by the embodiment can act and detect inside the pipeline, mainly at the connection between two pipelines. The first and second sealing assemblies 1 and 2 are located on the two sides of the connection, respectively. The cooperation of the first gas passage 4, the first and second spaces 11 and 12 enables the first and second sealing assemblies 1 and 2 to move and deform during the movement and abut against the inner wall of the pipeline when the first and second spaces 11 and 12 are inflated and pressurized through the first gas passage 4. Thus, the third space 13 is formed between the two sealing assemblies, the leak detection body, the first and second sealing assemblies 1 and 2 and the connection between the two pipelines. The gas tightness detection of the connection between the two pipelines can be completed by inflating and pressurizing the third space 13 through the first detection port 3.

[0050] In the embodiment, the leak detection tool is applied inside the pipeline and can be used for gas seal detection of a large-size casing with a diameter of 435 mm. The casing is shown in FIG. 1, and the leak detection tool is shown in FIG. 2. Figure 8 , FIG. 3 and FIG. 4. Figure 9 and FIG. 5. Figure 10The oil casing gas seal leak detection tool also comprises a joint 5, a first cap 6, a second cap 7 and a lead-in 8; the joint 5, the first cap 6, the first sealing element 1, the second sealing element 2, the second cap 7 and the lead-in 8 are sequentially arranged along the axial direction of the leak detection body; the joint 5, the first cap 6, the second cap 7 and the lead-in 8 are all structural components that can be easily understood by those skilled in the art, and will not be described here; the joint 5, the first cap 6, the second cap 7 and the lead-in 8 can all be sleeved on the leak detection body through threads, the joint 5 serves as a carrier or medium for connecting the leak detection tool to the equipment on the well or outside the pipeline, and a lifting ring 51 or a lifting hook can be arranged on the joint 5, and a through hole 51 can be arranged on the joint 5 for connecting the inflation and pressure charging pipeline to the first gas passage 4; the lead-in 7 serves as a structure for the leak detection tool to enter the well or the inside of the pipeline first, and has a guiding function through a conical head or a pointed head; the first cap 6 and the second cap 7 serve as limiters for the first sealing assembly 1 and the second sealing assembly 2 respectively, and are threadedly locked on the leak detection body, the first sealing assembly 1 and the second sealing assembly 2 abut against the first cap 6 and the second cap 7 respectively when moving away from each other, and there are no pressure control rings or other structures between the first cap 6 and the first sealing assembly 1 and between the second cap 7 and the second sealing assembly 2, which not only reduces the overall length of the leak detection tool but also reduces the overall weight of the leak detection tool, thereby reducing the difficulty of lifting and running in.

[0051] The leak detection body is a rigid structure, which can be a shaft structure or a cylinder structure, and the radial cross-sectional shape is not limited, which can be circular or rectangular and can be designed and adjusted according to the actual matching pipeline; the leak detection body in this embodiment can be an integral structure or a split connection and matching structure, for example: the first part matches the first sealing assembly 1, the first cap 6 and the joint 5, and the second part matches the second sealing assembly 2, the second cap 7 and the lead-in 8. The shape and length of the first gas passage 4 are not limited here and can be designed and adjusted as needed, as long as the first gas passage 4 is continuous from the joint 5 to the position where the second sealing assembly 2 is located. The first moving area a and the second moving area b are arranged at intervals between the first cap 6 and the second cap 7, and the interval between them can be realized by a stepped section on the leak detection body, for example: the middle part of the leak detection body has a stepped section with a larger diameter, and the rest has a smaller diameter, so that the joint 5, the first cap 6, the second cap 7 and the lead-in 8 are all sleeved on the position with a smaller diameter to ensure that the overall tool has a consistent outer surface height, the first cap 6 has a spacing with the stepped section, the second cap 7 also has a spacing with the stepped section, and the first moving area a and the second moving area b are formed at the spacing positions respectively, and the first sealing assembly 1 and the second sealing assembly 2 are also sleeved at the spacing positions respectively.

[0052] The first sealing assembly 1 and the second sealing assembly 2 are movably sleeved on the leak detection main body, and the first sealing assembly 1 and the second sealing assembly 2 can include a deformable structure, for example, a rubber tube. When the first sealing assembly 1 and the second sealing assembly 2 are driven to move along the axial direction of the leak detection main body, the rubber tube is extruded and deformed to increase the diameter and abut against the inner wall of the pipeline. Of course, the rubber tube can recover the deformation to realize repeated use when the pressure is released. The first space 11 and the second space 12 can be formed by sealing members protruding from the outer surface of the leak detection main body at both ends of the first moving area a and both ends of the second moving area b, supporting the sealing assemblies to form the spaces and sealing the spaces to ensure the driving of the first sealing assembly 1 and the second sealing assembly 2. It is not difficult to understand that the first moving area a and the second moving area b are provided with gas outlets 14 in communication with the first gas channel 1, so that the first gas channel 4 can communicate with the first space 11 and the second space 12.

[0053] The shape and size of the first detection port 3 are not limited here and can be designed and adjusted according to actual needs. The first detection port 3 can be arranged at a position between the first moving area a and the second moving area b without affecting the control of the two sealing assemblies and can also realize the inflation and pressurization of the third space 13 after the two sealing assemblies abut against the pipe wall. For example, the first detection port 3 can be arranged on the stepped section of the leak detection main body as described above, so that the third space 13 can be directly and quickly inflated and pressurized by the first gas channel 4 after the two sealing assemblies are deformed to form the third space 13, and the pipeline outside or outside the well can be used for gas detection or pressure detection for gas seal detection. Specifically, the first gas channel 4 inflates and pressurizes the first space 11 and the second space 13 to drive the first sealing assembly 1 and the second sealing assembly 2 to move and deform to abut against the inner wall of the pipeline to form the third space 13. When the first sealing assembly 1 and the second sealing assembly 2 can no longer move, the first gas channel 4 inflates and pressurizes the third space 13 through the first detection port 3 to detect the gas seal of the pipeline connection.

[0054] According to the above, the oil casing gas seal leak detection tool provided by the present application is provided with movable first sealing assembly 1 and second sealing assembly 2 outside the leak detection main body. The first gas channel 4 inflates and pressurizes the first space 11 and the second space 12 to drive the first sealing assembly 1 and the second sealing assembly 2 to move and deform to increase the radial size. Then, when the leak detection tool works inside the pipeline, the first sealing assembly 1 and the second sealing assembly 2 can be located on both sides of the connection to abut against the inner wall of the pipeline to form the third space 13, and the first detection port 3 is used to inflate and pressurize the third space 13 to detect the gas tightness of the connection. The overall structure is simple and the detection process is simple, which only needs to inflate and pressurize the detection tool through the first gas channel 4. Thus, the problem of the existing gas seal leak detection tool being only suitable for standard oil casing and having a complex structure and a tedious detection process is solved.

[0055] Further, referring to the accompanying drawings Figure 1 and the accompanying drawings Figure 4 , the oil casing gas seal leak detection tool provided by the embodiment further includes a second detection port 31 in specific implementation; the second detection port 31 is located between the first moving area a and the second moving area b and is arranged in a spaced manner with the first detection port 3, the second detection port 31 is in communication with the first gas channel 4, and is used for pressure relief of the third space 13 to the outside of the leak detection main body through the first gas channel 4.

[0056] It can be understood that in order to realize the oil casing gas seal detection, the second detection port 31 is further arranged in the embodiment, and the arrangement form of the second detection port 31 can refer to the first detection port 3, which will not be repeated here; the gas flow directions of the second detection port 31 and the first detection port 3 are different, the first detection port 3 is used for charging gas and pressure in the direction from the first gas channel 4 to the third space 13, and the second detection port 31 is used for discharging gas and pressure from the third space 13 to the outside of the leak detection tool through the first gas channel 4, thereby realizing the whole process of pressure charging and pressure relief of the gas seal detection. Correspondingly, in order to realize the gas discharge control in different directions of the two detection ports, referring to the accompanying drawings Figure 5 , the first one-way valve 32 and the second one-way valve 33 can be respectively arranged in the first detection port 3 and the second detection port 31 in the embodiment, the conduction directions of the first one-way valve 32 and the second one-way valve 33 are opposite; and it can be understood that the pressure bearing of the first one-way valve 32 is greater than the pressure at which the two sealing assemblies can be driven to move.

[0057] Further, referring to the accompanying drawings Figure 1 , the accompanying drawings Figure 6 and the accompanying drawings Figure 7 , the oil casing gas seal leak detection tool provided by the embodiment further includes a second detection port 31 in specific implementation; the second detection port 31 is located between the first moving area a and the second moving area b and is arranged in a spaced manner with the first detection port 3, the second detection port 31 is in communication with the first gas channel 4, and is used for pressure relief of the third space 13 to the outside of the leak detection main body through the first gas channel 4.

[0058] It can be understood that, in order to realize the driving deformation and recovery deformation of the two sealing assemblies, the first sealing assembly 1 is arranged in the form of including a first sliding sleeve 15 and a first rubber cylinder 16 in the embodiment; the first sliding sleeve 15 is a rigid annular structure, which can move in the first moving area a and extrude the first rubber cylinder 16 so that the diameter of the first rubber cylinder 16 increases; and in order to ensure the service life of the first rubber cylinder 16, a hard ring 17 can be arranged at each of the axial ends of the first rubber cylinder 16 in the embodiment, the hard ring 17 is a rigid structure, which is in abutment with the first sliding sleeve 15, and when the first sliding sleeve 15 is driven to move, the extrusion force is transmitted to the first rubber cylinder 16 through the hard ring 17, the first rubber cylinder 16 receives the force, the damage risk is reduced, and the service life is effectively prolonged; correspondingly, the second sealing assembly 2 can include a second sliding sleeve 21, a second rubber cylinder 22 and a hard ring 17. And in order to realize the movement of the first sliding sleeve 15 and the second sliding sleeve 21, the gas outlet 14 can be arranged corresponding to the first sliding sleeve 15 and the second sliding sleeve 21 in the embodiment.

[0059] Further, with reference to the accompanying drawings Figure 3 and the accompanying drawings Figure 4 , the oil casing gas sealing leak detection tool provided by the embodiment, in specific implementation, the leak detection body includes an upper part 9 and a lower part 10; the upper part 9 includes a first body shaft 91, the axial ends of the first body shaft 91 are respectively provided with a first shaft body 92 and a second shaft body 93, the diameters of the first shaft body 92 and the second shaft body 93 are both smaller than the diameter of the first body shaft 91; the first gas channel 4 simultaneously penetrates the first shaft body 92, the first body shaft 91 and the second shaft body 93; the lower part 10 includes a second body shaft 101, the first end of the second body shaft 101 is provided with a connecting groove 102 for screwing the first shaft body 92; the second end of the second body shaft 101 is connected with a third shaft body 103, the diameter of the third shaft body 103 is smaller than the diameter of the second body shaft 101; the first gas channel 4 penetrates the area between the connecting groove 102 and the third shaft body 103;

[0060] , wherein the first moving area a includes part of the first body shaft 91 and part of the second shaft body 93; the second moving area b includes part of the second body shaft 101 and part of the third shaft body 103.

[0061] It can be understood that, in order to reduce the installation difficulty of the leak detection tool as a whole, the leak detection body is provided in the form of an upper part 9 and a lower part 10 in the embodiment; the upper part 9 and the lower part 10 are both rigid shaft body structures, and the upper part 9 and the lower part 10 can be connected by thread locking. Specifically, a connecting groove 102 is arranged on the lower part 10, and an inner thread is arranged on the inner side wall of the connecting groove 102. An outer thread is arranged on the first shaft body 92 of the upper part 9, so that the two can be threadedly connected to form the leak detection body. In the embodiment, the diameter of the second main shaft 101 is equal to the diameter of the first main shaft 91, so that after the first shaft body 91 is locked into the connecting groove 102, the first main shaft 91 and the second main shaft 101 are in abutment. Correspondingly, the second shaft body 93 is used to carry the first sealing assembly 1, the first union cap 6 and the joint 5, and the third shaft body 103 is used to carry the second sealing assembly 2, the second union cap 7 and the angle piece 8, so that the first gas passage 4 penetrates through the entire structure of the upper part 9 and is connected to penetrate through the lower part 10 to the position corresponding to the second moving area b. The first detection port 3 and the second detection port 31 can be arranged on the outer wall of the second main shaft 101. Correspondingly, with reference to the accompanying drawings, Figure 6 In the embodiment, the inner wall of the first sliding sleeve 15 is in the form of a T-shaped cylinder, so that it can be partially sleeved on the first main shaft 91 and partially sleeved on the second shaft body 93. Thus, the first space 11 can be at a position corresponding to the first main shaft 91, at a position corresponding to the second shaft body 93, or at a position where the first main shaft 91 and the second shaft body 93 meet, for example, with reference to the accompanying drawings, Figure 3 The larger diameter part of the first sliding sleeve 15 covers part of the first main shaft 91 and part of the second shaft body 93, and a space, i.e., the first space 11, is formed between the first sliding sleeve 15 and the second shaft body 93 at the position corresponding to the second shaft body 93. The arrangement mode corresponding to the lower part 10 can be the same. It can be understood that the first moving area a corresponding to the first sliding sleeve 15 is included in the area where the first sliding sleeve 15 covers the first main shaft 91, and the second sliding sleeve 21 is the same. Details are not described here.

[0062] Further, with reference to the accompanying drawings, Figure 4 The oil casing gas seal leak detection tool provided in the embodiment is provided with a gas outlet 14 at the connection between the first main shaft 91 and the second shaft body 93 and at the connection between the second main shaft 101 and the third shaft body 103 in specific implementation.

[0063] It can be understood that, in order to reduce the difficulty of structural arrangement, the gas outlet is arranged at the variable diameter part in the embodiment, thereby effectively extending the size of the first space 11 and the second space 12 in the axial direction of the leak detection body, reducing the difficulty of arranging the gas outlet 14 and the difficulty of arranging the first space 11 and the second space 12. Correspondingly, with reference to the accompanying drawings, Figure 4, the first main shaft 91 is provided with a first sealing member 94 around its axial direction towards one end of the second shaft body 93, the second shaft body 93 is provided with a second sealing member 95 around its axial direction on the side of the outlet 14 away from the first main shaft 91, the first sealing member 94 and the second sealing member 95 both abut the inner wall of the first sealing assembly 1 to form a first interval region, i.e. the first space 11, between the first sealing member 94 and the second sealing member 95, and the outlet 14 is in the first space 11. Referring to the accompanying drawings Figure 3 , the second main shaft 101 is provided with a third sealing member 104 around its axial direction towards one end of the third shaft body 103, the third shaft body 103 is provided with a fourth sealing member 105 around its axial direction on the side of the outlet 14 away from the third shaft body 103, the third sealing member 104 and the fourth sealing member 105 both abut the inner wall of the second sealing assembly 2 to form a second interval region, i.e. the second space 12, between the third sealing member 104 and the fourth sealing member 105.

[0064] Further, referring to the accompanying drawings Figure 5 , the oil casing gas sealing leak detection tool provided by the embodiment, in specific implementation, the second main shaft 101 between the connecting groove 102 and the third shaft body 103 is provided with at least one buffer groove 106, the buffer groove 106 is in communication with the connecting groove 102.

[0065] It can be understood that, in order to improve the overall safety of the leak detection tool, the buffer groove 106 is arranged on the second main shaft 101 between the connecting groove 102 and the third shaft body 103 in the embodiment, the shape and size of the buffer groove 106 are not limited here, which can be Figure 5 cylindrical or other arbitrary shapes as long as it does not interfere with the first gas passage 4, the first one-way valve 32 and the second one-way valve 33; the arrangement of the buffer groove 106 can buffer the pressure charging and pressure releasing, reduce the impact of rapid pressure charging or pressure releasing on the lower part 10, the upper part 9, the outlet 14 and even the detection port, improve the safety and prolong the service life of the tool.

[0066] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A tubing-casing gas-tight leak detection tool characterized by, It comprises: A leak detection body, a hollow area is provided in the leak detection body from the first end to a specified position along the axial direction thereof, forming a first gas passage; a first moving area and a second moving area are provided on the outer wall of the leak detection body and spaced apart corresponding to the range of the first gas passage; A first sealing assembly and a second sealing assembly, the first sealing assembly and the second sealing assembly are movably sleeved in the leak detection body corresponding to the first moving area and the second moving area respectively; the first sealing assembly and the second sealing assembly can reciprocate along the axial direction of the leak detection body in the first moving area and the second moving area respectively; a first space is formed between the first moving area and the first sealing assembly, and a second space is formed between the second moving area and the second sealing assembly; The first gas passage is connected with the first space and the second space, and when the first gas passage is inflated and pressurized into the first space and the second space, the first sealing assembly and the second sealing assembly move away from each other and increase in radial size to abut against the inner wall of the sleeve, so as to form a third space between the first sealing assembly and the second sealing assembly; A first detection port, the first detection port is located between the first moving area and the second moving area, and the first detection port is connected with the first gas passage, and is used for inflating the third space.

2. The oil casing gas seal leak detection tool according to claim 1, further comprising a second detection port; The second detection port is located between the first moving area and the second moving area and is spaced apart from the first detection port, the second detection port is connected with the first gas passage, and is used for pressure relief from the third space to the outside of the leak detection body through the first gas passage.

3. The oil casing gas seal leak detection tool according to claim 1, wherein: The first moving area and the second moving area are respectively provided with a first spacing area and a second spacing area, the inner wall of the first sealing assembly and the first spacing area are spaced apart to form the first space, and the inner wall of the second sealing assembly and the second spacing area are spaced apart to form the second space; Wherein, the first spacing area and the second spacing area are provided with an air outlet, and the air outlet is connected with the first gas passage.

4. The oil casing gas seal leak detection tool according to claim 1, wherein: The first sealing assembly comprises a first sliding sleeve and a first rubber tube; The first sliding sleeve and the first rubber tube are sequentially arranged in the axial direction of the leak detection body away from the second sealing assembly, and the first sliding sleeve and the leak detection body form the first space; Wherein, the second sealing assembly and the first sealing assembly are the same structure.

5. The oil casing gas seal leak detection tool according to claim 1, wherein: The leak detection body comprises an upper part and a lower part; ​ The upper part comprises a first main shaft, axial ends of the first main shaft are respectively provided with a first shaft body and a second shaft body, diameters of the first shaft body and the second shaft body are smaller than a diameter of the first main shaft; the first gas channel penetrates the first shaft body, the first main shaft and the second shaft body; The lower part comprises a second main shaft, a first end of the second main shaft is provided with a connecting groove for screwing the first shaft body; a second end of the second main shaft is connected with a third shaft body, a diameter of the third shaft body is smaller than a diameter of the second main shaft; the first gas channel penetrates a region between the connecting groove and the third shaft body; The first moving region comprises a part of the first main shaft and a part of the second shaft body; the second moving region comprises a part of the second main shaft and a part of the third shaft body.

6. The oil casing gas seal leak detection tool according to claim 5, characterized in that: The connecting positions of the first main shaft and the second shaft body and the connecting positions of the second main shaft and the third shaft body are respectively provided with gas outlets.

7. The oil casing gas seal leak detection tool according to claim 6, characterized in that: An end of the first main shaft towards the second shaft body is provided with a first sealing member around an axial direction thereof, the second shaft body is provided with a second sealing member around an axial direction thereof on a side of the second shaft body away from the first main shaft, the first sealing member and the second sealing member abut against an inner wall of the first sealing assembly, and the first sealing member and the second sealing member form the first space therebetween; An end of the second main shaft towards the third shaft body is provided with a third sealing member around an axial direction thereof, the third shaft body is provided with a fourth sealing member around an axial direction thereof on a side of the third shaft body away from the second main shaft, the third sealing member and the fourth sealing member abut against an inner wall of the second sealing assembly, and the third sealing member and the fourth sealing member form the second space therebetween.

8. The oil casing gas seal leak detection tool according to claim 5, characterized in that: At least one buffer groove is arranged on the second main shaft between the connecting groove and the third shaft body, and the buffer groove is in communication with the connecting groove.

9. The oil casing gas seal leak detection tool according to claim 2, characterized in that: First and second one-way valves are respectively arranged in the first detection port and the second detection port, and the first one-way valve and the second one-way valve are opposite in the direction of conduction.

10. The oil casing gas seal leak detection tool according to claim 1, characterized in that: It further comprises a joint, a first cap, a second cap and a lead angle; The first cap and the joint are sequentially arranged on a side of the first sealing assembly away from the second sealing assembly, and the joint is provided with a through hole for connecting the first gas channel; The second cap and the lead angle are sequentially arranged on a side of the second sealing assembly away from the first sealing assembly.

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