A pressure testing device and method for a hydraulic expansion permanent completion tool

Abstract

The application provides a pressure testing device and method of a hydraulic expansion solid completion tool, and belongs to the technical field of oil and gas solid completion tools. The device comprises a lower joint, and a liquid injection joint is connected to the lower joint. Alternatively, the pressure testing device comprises a lower joint, one end of the lower joint is connected with an upper blind plate, an upper pressure bearing plate is sleeved in the pipe wall of the lower joint, a first cover plate is arranged outside the lower joint, the upper pressure bearing plate and the upper blind plate, and a lower blind plate and a lower pressure bearing plate are further included, and a second cover plate is arranged outside the lower blind plate and the lower pressure bearing plate. The application is suitable for sealing test of a rubber tube part and a pipe string connection buckle, and can test the pressure sealing capacity of the rubber tube at 35 MPa, so that the use site working condition can be met under normal use condition. In addition, the tool thread will not be damaged due to repeated disassembly and pressure sealing head during the pressure testing process.

Description

Technical Field

[0001] This invention belongs to the technical field of oil and gas cementing and completion tools, specifically relating to a pressure testing device and method for a hydraulic expansion cementing and completion tool. Background Technology

[0002] Currently, the pressure testing methods for similar devices are quite outdated. The conventional testing method involves installing a cap at the front end and pressurizing it. After the liquid enters the rubber tube through the flow hole, a pressure-bearing and sealing test is performed on the rubber tube. In addition, hemp rope is wrapped around the expansion part of the rubber tube to prevent excessive expansion. However, this pressure testing method can only test the sealing ability of the rubber tube under low pressure (generally 5MPa), while the pressure in actual field applications is higher than 5MPa. Obviously, this pressure testing method cannot meet the requirements of field use. Furthermore, when testing the overall sealing performance, it is necessary to connect the caps at the upper and lower ends to test the seal. During the test, the threads need to be repeatedly disassembled, which can easily damage the tool threads. In addition, disassembling the threads consumes a lot of manpower and resources, making the pressure testing process too cumbersome.

[0003] Chinese patent publication CN104655413A discloses a test device for a casing external packer, including a test outer tube, which is a hollow tubular column. Both ends of the test outer tube are fixedly connected to fastening plug I and fastening plug II via threads to form a sealed cavity. A test casing external packer is installed inside the cavity of the test outer tube, and the lower end of the casing external packer is sealed and connected to a plug to form a sealed space. A pump connector connected to a pressure testing pump is mounted on fastening plug II. A test connecting pipe is sealed and connected through the inner hole of fastening plug I. One end of the test connecting pipe is placed inside the test outer tube, and the other end is placed outside the fastening plug I. The top end of the test connecting pipe placed outside the fastening plug I is connected to a connector with a needle valve. This device can effectively separate components, ensuring normal construction, and can effectively complete the simulation test before the casing external packer is applied in the field. It is simple to operate, highly reliable, and can ensure that the casing external packer achieves its intended use in the field after the test.

[0004] Chinese patent publication CN104655413A discloses a packer sealing performance testing device. The device involves placing a packer in a test wellbore, setting the packer with a loading nut, and simultaneously sealing the test wellbore. A pressure regulating pump is used to input the test medium into the test wellbore. The test medium is then introduced into one side of the packer in the test wellbore through a first water injection pipe and into the other side of the packer through a second water injection pipe, thus testing the packer's sealing performance.

[0005] Neither of the above two test devices is suitable for sealing tests of the expanded parts of the rubber sleeve and the joints of the tubing. Therefore, there is an urgent need to develop a pressure testing device with high pressure-bearing sealing capacity that is suitable for sealing tests of the expanded parts of the rubber sleeve and the joints of the tubing. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art and provide a pressure testing device and method for hydraulic expansion cementing completion tools. This device is suitable for sealing tests of the expansion part of the rubber sleeve and the sealing tests of the tubing connection buckle. It can also test the pressure-bearing sealing capacity of the rubber sleeve at 35MPa, ensuring that it can meet the on-site working conditions under normal use. In addition, the tool threads will not be damaged due to repeated disassembly and pressure testing of the end cap during the pressure test.

[0007] This invention is achieved through the following technical solution:

[0008] In a first aspect, the present invention provides a pressure testing device for a hydraulic expansion cementing completion tool, the pressure testing device comprising a lower connector and an injection connector connected to the lower connector;

[0009] Alternatively, the pressure testing device includes a lower connector, one end of which is connected to an upper blind plate; an upper pressure plate is sleeved in the middle of the pipe wall of the lower connector, and a first cover plate is provided outside the lower connector, the upper pressure plate, and the upper blind plate; it also includes a lower blind plate and a lower pressure plate, and a second cover plate is provided outside the lower blind plate and the lower pressure plate.

[0010] A further improvement of the present invention is that,

[0011] One end of the lower connector is welded with a union joint, and the other end of the lower connector has an external thread on the pipe wall, and a sealing surface is provided on the outside of the external thread;

[0012] The lower connector has a raised connecting part in the middle of its pipe wall, and the raised connecting part has a connecting thread.

[0013] A further improvement of the present invention is that,

[0014] The injection connector is a sleeve structure with one end open and the other end closed. The open end of the injection connector is provided with an internal thread, which matches the external thread on the lower connector.

[0015] The sealed end of the injection connector has multiple flow holes along the circumferential direction on the pipe wall, and also has an annular flow groove. The flow groove is connected to the multiple flow holes, and the multiple flow holes are connected to the inner cavity of the injection connector.

[0016] A further improvement of the present invention is that,

[0017] The pressure testing device also includes a limiting device, which is a ring with threads on its outer end face. During the pressure test, the limiting device contacts the end face of the closed end of the injection connector, and the limiting device is connected to the bottom end of the functional part of the hydraulic expansion cementing completion tool via threads.

[0018] A further improvement of the present invention is that,

[0019] The upper pressure plate is a sleeve with threads on its inner wall. The upper pressure plate is sleeved on the protruding connecting part of the lower connector and connected by threads.

[0020] A further improvement of the present invention is that,

[0021] The upper blind plate is a sleeve with threads on its inner wall, and the threads on the inner wall of the upper blind plate match the external threads on the lower connector; and a sealing surface is provided on the outer diameter end face of the tube wall of the upper blind plate.

[0022] A further improvement of the present invention is that,

[0023] The outer end face of the lower blind plate is provided with a sealing surface.

[0024] A further improvement of the present invention is that,

[0025] The first cover plate is fixed by a first retaining ring;

[0026] The second cover plate is fixed by a second retaining ring.

[0027] A further improvement of the present invention is that,

[0028] The first cover plate and the second cover plate have the same structure. Both are cylindrical structures with a limiting step at one end, cut into two semi-cylindrical structures from the middle line, and the limiting step limits the upper or lower pressure plate.

[0029] In a second aspect, the present invention provides a pressure testing method for a hydraulic expansion cementing and completion tool, wherein the pressure testing device described above is used to perform a pressure-bearing and sealing test on the rubber sleeve portion and the tubing connection buckle of the hydraulic expansion cementing and completion tool.

[0030] A further improvement of the present invention is that,

[0031] The pressure-bearing seal test of the rubber sleeve of the hydraulic expansion cementing completion tool includes the following steps:

[0032] (1) Wrap a layer of resin fiber material evenly around the outside of the rubber tube, and then put an outer sleeve on the outer layer;

[0033] (2) Connect the limiting device to the bottom of the functional part by thread, connect the liquid injection connector to the lower connector by thread, and then directly insert the liquid injection connector into the bottom sealing surface of the functional part, and the end face of the liquid injection connector is in contact with the limiting device.

[0034] (3) Connect the pipeline to the union joint and start pressurizing. The water flows through the lower joint cavity, the inner cavity of the injection joint, the flow hole and the flow groove into the cavity of the rubber sleeve to conduct a pressure sealing test.

[0035] A further improvement of the present invention is that,

[0036] In step (3), during the pressure sealing test, when the rubber sleeve is pressurized to 35 MPa, the pump is stopped and the pressure is stabilized. If there is no obvious pressure drop at this time, it proves that the pressure sealing ability of the rubber sleeve is good. Otherwise, it proves that the pressure sealing ability of the rubber sleeve is poor.

[0037] A further improvement of the present invention is that,

[0038] The pressure sealing test of the tubing connection threads of hydraulic expansion cementing completion tools includes the following steps:

[0039] (1) Close the injection hole channel of the rubber sleeve through the plug seat;

[0040] (2) Install the pressure testing device into the hydraulic expansion cementing completion tool;

[0041] (3) Connect the pipeline to the union joint and start pressurization. Water flows through the lower joint into the cavity of the hydraulic expansion cementing tool to conduct a pressure sealing test.

[0042] A further improvement of the present invention is that,

[0043] The specific operation in step (2) is as follows:

[0044] First, connect the upper blind flange to the lower connector by thread and seal with a sealing ring. Then, install the upper blind flange onto the sealing surface of one end of the hydraulic expansion cementing tool. Next, connect the upper pressure plate to the protruding connection part of the lower connector so that the upper pressure plate contacts the end face of one end of the hydraulic expansion cementing tool. Cover with the first cover plate and limit the upper pressure plate by the limiting step of the first cover plate. The first cover plate is fixed by the first fixing ring.

[0045] The second step is to install the lower blind flange onto the sealing surface of the other end of the hydraulic expansion cementing tool, then bring the lower bearing plate into contact with the other end face of the hydraulic expansion cementing tool, and cover it with the second cover plate. The lower bearing plate is limited by the limiting step of the second cover plate, and the second cover plate is fixed by the second solid ring.

[0046] A further improvement of the present invention is that,

[0047] In step (3), the pressure sealing test is specifically as follows:

[0048] With the upper and lower blind flanges sealing the connection, water can completely enter the tubing of the hydraulic expansion cementing tool. If no pressure drop occurs, it indicates that the tubing connection is well sealed. If fluid leakage or pressure drop occurs between the tubing connections, it indicates that the seal is poor.

[0049] Compared with the prior art, the beneficial effects of the present invention are:

[0050] This invention provides an apparatus and method for hydraulic expansion cementing and completion tools. The apparatus is simple to operate and employs a segmented pressure testing principle. First, the sealing capability of the rubber sleeve is tested. Further testing of the sleeve's sealing performance involves wrapping it with an outer layer of resin fiber material and then adding an outer casing. This ensures both a high-pressure testing scheme and prevents damage to the rubber sleeve during the testing process. After the initial test, a non-destructive pressure test is used to test the sealing performance of the tubing connection buckles of the entire apparatus. This test process does not damage the buckles at either end of the apparatus, maximizing the integrity of the device. This invention optimizes the pressure testing apparatus for hydraulic expansion cementing and completion tools to the greatest extent possible and proposes a segmented, non-destructive pressure testing method.

[0051] (1) Simple and quick operation: The pressure testing device of the present invention adopts the principle of segmented pressure testing. The lower connector is installed to test the sealing of the rubber sleeve part of the hydraulic expansion cementing and completion tool. Then, the pipe string connection buckle of the entire hydraulic expansion cementing and completion tool is tested for sealing. This avoids the secondary repeated pressure testing of the pipe string connection buckle and greatly improves the pressure testing efficiency.

[0052] (2) The pressure test process closely matches the on-site usage requirements: Compared with conventional pressure test methods, the pressure test device of this invention verifies the high-pressure sealing performance of the rubber tube and effectively prevents the rubber tube from over-expanding.

[0053] (3) Reasonable structural design and easy disassembly: In the pressure test process, the present invention does not use the pressure test head with connecting buckle, thus avoiding repeated disassembly of the head during the pressure test process and causing damage to the tool threads. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the installation structure for the sealing test of the rubber sleeve portion of the hydraulic expansion well completion tool of the present invention;

[0055] Figure 2 This is a structural diagram of the injection connector;

[0056] Figure 3 This is a structural diagram of the lower connector;

[0057] Figure 4 This is a structural schematic diagram of the cover plate;

[0058] Figure 5This is a schematic diagram of the installation structure for the sealing test of the tubing connection buckle of the hydraulic expansion well completion tool of the present invention.

[0059] In the diagram, 1. Lower connector, 1-1. External thread, 1-2. Sealing surface, 1-3. Connecting thread, 2. Injection connector, 3. Limiting device, 4. Functional part, 5. Sleeve part, 6. Resin fiber material, 7. Outer sleeve, 8. Upper pressure plate, 9. First fixing ring, 10. First cover plate, 11. Upper blind plate, 12. Second fixing ring, 13. Second cover plate, 14. Lower blind plug, 15. Lower pressure plate, 16. Flow hole, 17. Flow groove. Detailed Implementation

[0060] The present invention will now be described in further detail with reference to the accompanying drawings:

[0061] This invention provides a pressure testing device that can quickly and conveniently test hydraulic expansion well completion tools, and can test the pressure-bearing and sealing capacity of the rubber sleeve at 35MPa, ensuring that it can meet the on-site working conditions under normal use; in addition, the tool threads will not be damaged due to repeated disassembly and pressure testing of the end cap during the pressure test.

[0062] This invention provides a pressure testing device for hydraulic expansion cementing completion tools, the structure of which is illustrated in the following embodiment:

[0063]

Example 1

[0064] A pressure device for a hydraulic expansion cementing completion tool, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes: a lower connector 1 and a liquid injection connector 2.

[0065] One end of the lower connector 1 is welded with a union joint, and the other end of the lower connector 1 is connected to the injection connector 2.

[0066] Furthermore, such as Figure 3 As shown, the lower connector 1 has an external thread 1-1 on the pipe wall at one end, and a sealing surface 1-2 on the outside of the external thread 1-1. The injection connector 2 is connected to the external thread 1-1 and sealed by a sealing ring, which ensures good sealing performance while guaranteeing the test pressure strength; and / or, the lower connector 1 has a raised connecting part in the middle of the pipe wall, and the raised connecting part has a connecting thread 1-3.

[0067] Furthermore, such as Figure 2As shown, the injection connector 2 is a sleeve structure with one open end and the other closed. The open end of the injection connector 2 has an internal thread, which matches the external thread 1-1 on the lower connector 1. The closed end of the injection connector 2 has multiple flow holes 16 circumferentially arranged on its wall, and also an annular flow groove 17. The flow groove 17 is connected to all the flow holes 16, and all the flow holes 16 are connected to the inner cavity of the injection connector 2. Since the cavity of the lower connector 1 is connected to the inner cavity of the injection connector 2, and the multiple flow holes 16 are also connected to the inner cavity of the injection connector 2, water entering the lower connector 1 can flow through the multiple flow holes 16 into the flow groove 17. The position of the flow groove 17 corresponds to the position of the injection hole in the rubber sleeve, and thus flows into the rubber sleeve cavity.

[0068] The purpose of designing the flow channel 17 is to ensure that in actual testing, it is not necessary to align the flow holes on the injection connector 2 with the injection holes of the rubber sleeve. It is sufficient to ensure that the injection connector 2 is installed in place. During the pressure test, the liquid will flow into the injection hole of the rubber sleeve through the flow channel 17.

[0069] Generally, the rubber sleeve of a hydraulic expansion cementing completion tool has four circumferentially arranged inlet holes. If a flow channel is not designed, when the injection connector 2 is installed, it is necessary to ensure that the flow channel of the injection connector is connected to the inlet hole of the rubber sleeve, which makes the installation difficult. However, if a flow channel is designed, this situation is not a concern. Regardless of whether they are aligned, the liquid will enter the inlet hole through the flow channel, ensuring the testing efficiency of the testing process.

[0070] The pressure testing device also includes a limiting device 3, which is a ring with threads on its outer end face. During the pressure test, the limiting device 3 contacts the end face of the sealed end of the injection connector 2 and is connected to the bottom of the functional part of the hydraulic expansion cementing tool through threads, thus playing a limiting role.

[0071] The hydraulic expansion well completion tool mainly consists of a functional part and a rubber sleeve part. The bottom of the functional part has a sealing surface, into which the injection connector is inserted to achieve a sealing function. The injection connector can be directly inserted into the sealing surface of the functional part to achieve a seal. In actual testing, because the inlet hole of the rubber sleeve part is set perpendicular to the sealing surface of the functional part, the injection connector 2 will not experience lateral displacement during the pressure test. Therefore, the end face of the injection connector 2 only needs to contact the limiting device 3, without the need for a threaded connection; the limiting device 3 is connected to the bottom of the functional part by a thread.

[0072] This invention provides a pressure testing method for hydraulic expansion cementing and completion tools. The method uses the aforementioned pressure testing device to test the rubber sleeve portion of the hydraulic expansion cementing and completion tool. An embodiment of the method is as follows:

[0073]

Example 2

[0074] Hydraulic expansion completion tools mainly consist of functional parts (different tools have different functional structures) and a rubber sleeve. The method for conducting a pressure-bearing and sealing test on the rubber sleeve using the aforementioned pressure testing device for hydraulic expansion completion tools specifically includes the following steps:

[0075] (1) Install the quick pressure testing device for the rubber sleeve section;

[0076] (2) A layer of resin fiber material 6 is evenly wrapped around the outside of the rubber tube 5. The thickness of the resin fiber material 6 is about 1.5-2mm. Then, an outer sleeve 7 is put on the outer layer to ensure the expansion gap and avoid damage caused by excessive expansion of the rubber tube. At the same time, the device is easy to disassemble after the pressure test is completed.

[0077] It should be noted that ensuring the expansion gap requires the inner diameter of the outer sleeve 7 to be larger than the outer diameter of the rubber tube (about 8mm is sufficient). Since the rubber tube will compress the outer sleeve when it expands, if the resin fiber material is not installed, the entire device will be difficult to remove after the test, and irreversible damage will be caused to the rubber tube. The role of the resin limiting material is to ensure the expansion gap while avoiding damage caused by excessive expansion of the rubber tube, and the device is easy to disassemble after the pressure test.

[0078] (3) Connect the limiting device 3 to the bottom of the functional part by thread, then insert the liquid injection connector 2 directly into the bottom sealing surface of the functional part 4, connect the pipeline on the union connector to start pressurization, and the water flows through the cavity of the lower connector 1, the inner cavity of the liquid injection connector 2, the flow hole 16 and the flow groove 17 into the cavity of the rubber sleeve part 5 to conduct a pressure sealing test.

[0079] When the pressure in the rubber sleeve reaches 35 MPa, the pump is stopped and the pressure is stabilized. If there is no significant pressure drop at this point, it proves that the pressure-bearing and sealing capacity of the rubber sleeve is good. Conversely, if there is no significant pressure drop, it proves that the pressure-bearing and sealing capacity of the rubber sleeve is poor.

[0080] In this invention, when testing the seal of the rubber sleeve, the lower connector is first connected to the injection connector, and the other end of the lower connector is connected to the pressure testing line to start pressurization. The liquid enters the flow channel and flow groove of the injection connector through the lower connector, and then enters the rubber sleeve through the injection channel. At this time, the rubber sleeve expands and seals, thus completing the seal test of the rubber sleeve. During the pressure test of the rubber sleeve, in order to ensure that the rubber sleeve is not damaged during the expansion process, a layer of resin fiber material is wrapped around the outside of the rubber sleeve before the outer sleeve is put on. This satisfies the high pressure test requirements of the rubber sleeve while ensuring that the rubber sleeve is not damaged during the pressure test.

[0081] The present invention also provides a pressure testing device for a hydraulic expansion well completion tool, the structure of which is described in the following embodiment:

[0082]

Example 3

[0083] like Figure 5As shown, a pressure testing device for a hydraulic expansion well completion tool includes a lower connector 1.

[0084] One end of the lower connector 1 is welded with a union joint, and the other end is connected to an upper blind flange 11. An upper pressure plate 8 is sleeved in the middle of the pipe wall of the lower connector 1.

[0085] A first cover plate 10 is provided outside the lower connector 1, the upper pressure plate 8 and the upper blind plate 11, and the first cover plate 10 is fixed by a first fixing ring 9;

[0086] The device also includes a lower blind plate 14 and a lower pressure plate 15. A second cover plate 13 is provided outside the lower blind plate 14 and the lower pressure plate 15. The second cover plate 13 is fixed by a second fixing ring 12.

[0087] The lower connector 1 is welded to a union connector for pressure testing. When testing the sealing of each connector, the lower connector 1 is connected to the upper pressure plate 8 by threads. When under pressure, the force exerted on the lower connector 1 is transferred to the first cover plate 10 through the upper pressure plate 8.

[0088] During the pressurization process, the internal pressure acting on the upper blind plate 11 and the lower blind plate 14 is transferred to the first cover plate 10 and the second cover plate 13 through the upper bearing plate 8 and the lower bearing plate 15. The first cover plate 10 and the second cover plate 13 are then limited by the first fixing ring 9 and the second fixing ring 12, respectively. At this time, the internal pressure is converted into the test of the external force.

[0089] Furthermore, such as Figure 3 As shown, the lower connector 1 has an external thread 1-1 on the pipe wall at one end, and a sealing surface 1-2 is provided on the outside of the external thread 1-1. The upper blind plate 11 is connected to the external thread 1-1 and sealed by a sealing ring, which ensures good sealing performance while guaranteeing the test pressure strength; and / or, the lower connector 1 has a raised connecting part in the middle of the pipe wall, and the raised connecting part is provided with a connecting thread 1-3. The upper pressure plate 8 is a sleeve with threads on the inner wall. The upper pressure plate 8 is sleeved on the raised connecting part of the lower connector 1 and connected by threads.

[0090] Furthermore, the upper blind plate 11 is a sleeve with threads on its inner wall. The threads on the upper blind plate 11 match the external threads on the lower connector 1, and a sealing surface is provided on the outer diameter end face of the pipe wall of the upper blind plate 11. In actual testing, the upper blind plate 11 needs to be inserted into the sealing surface of one end of the hydraulic expansion well completion tool. Its function is to maintain the seal during the testing process.

[0091] Furthermore, the first cover plate 10 and the second cover plate 13 have the same structure, such as... Figure 4 As shown, all are cylindrical structures with a limiting step at one end, cut into two semi-cylindrical structures from the middle line, and the limiting step is used to limit the upper or lower pressure plate.

[0092] The cover plate has a variable diameter at both ends. After processing, it is cut open at the axial center with wire cutting to ensure that the upper and lower pressure plates are well limited during installation. After the cover plate is installed, a fixing ring is hooped on the outer layer to limit the displacement of the cover plate during the pressure process.

[0093] The upper and lower pressure plates are respectively limited by the first cover plate 10 and the second cover plate 13 to ensure that the pressure generated during the pressure test is transferred to the first cover plate 10 and the second cover plate 13 through the upper and lower pressure plates respectively. The first cover plate 10 and the second cover plate 13 are fixed by the first fixing ring 9 and the second fixing ring 12 respectively to ensure that the first cover plate 10 and the second cover plate 13 will not have large displacement due to excessive pressure.

[0094] Furthermore, a sealing surface is provided on the outer end face of the lower blind flange 14, so that when the lower blind flange 14 is installed on the rear sealing surface of the hydraulic expansion completion tool, it is sealed by a sealing ring.

[0095] During the pressure test, the lower blind flange 14 is inserted into the rear sealing surface of the hydraulic expansion completion tool to maintain the seal during the test. Then, the lower bearing plate 15 is brought into contact with the lower blind flange 14 and the rear end face of the hydraulic expansion completion tool, and then locked between the diameter of the second cover plate 13. In this way, the lower blind flange 14 can also play a good limiting role during the actual pressure test. The pressure generated by the pressure test will act on the lower bearing plate, and the lower bearing plate 15 will then act on the second cover plate 13 and then be transmitted to the second fixing ring 12. In this way, the internal pressure during the pressure test is converted into mechanical energy, avoiding stress on the tubing connection buckle and protecting the integrity of the device.

[0096] This invention provides a pressure testing method for hydraulic expansion cementing and completion tools. The method uses the aforementioned pressure testing device to test the connection threads of the hydraulic expansion cementing and completion tool string. An embodiment of the method is as follows:

[0097]

Example 4

[0098] The method for conducting pressure tests on tubing connection couplings using the aforementioned rapid pressure testing device specifically includes the following steps:

[0099] (1) Close the injection hole channel of the rubber sleeve through the plug seat;

[0100] (2) Install the above-mentioned pressure testing device into the hydraulic expansion cementing completion tool;

[0101] The specific steps are as follows:

[0102] First, connect the upper blind flange 11 to the lower connector 1 by thread and seal it with a sealing ring. Then, install the upper blind flange 11 onto the sealing surface of one end of the hydraulic expansion cementing tool. Since the outer diameter end face of the upper blind flange 11 is designed with a sealing surface, its function is to maintain the seal during the test. Then, connect the upper pressure plate 8 to the protruding connection part of the lower connector 1 so that the upper pressure plate contacts the end face of one end of the hydraulic expansion cementing tool. Cover with the first cover plate 10 and limit the upper pressure plate 8 by the limiting step of the first cover plate 10. The first cover plate 10 is fixed by the first fixing ring 9.

[0103] The second step is to install the lower blind flange 14 onto the sealing surface of the other end of the hydraulic expansion cementing tool, then to bring the lower pressure plate 15 into contact with the other end face of the hydraulic expansion cementing tool and the lower blind flange 14, and then cover it with the second cover plate 13. The lower pressure plate 14 is limited by the limiting step of the second cover plate 13, and the second cover plate 13 is fixed by the second fixing ring 12.

[0104] The purpose of this design is to ensure that the pipe joints at both ends are not subjected to external forces when testing the seal of the entire set of pipe joints, thus preventing damage to the joints during the pressure test.

[0105] (3) Connect the pipeline to the union joint and start pressurization. Water flows through the lower joint 1 into the cavity of the hydraulic expansion cementing tool to conduct a pressure sealing test.

[0106] The pressure sealing test specifically includes:

[0107] With the sealing of the upper blind flange 11 and the lower blind flange 14, water completely enters the tubing of the hydraulic expansion cementing tool. At this time, the water is completely inside the tubing. If no pressure drop occurs, it means that the tubing connection is well sealed. If liquid leakage and pressure drop occur between the tubing connections, it means that the seal is not good.

[0108] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0109] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0110] The above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the specific embodiments of the present invention. Therefore, the foregoing description is only a preferred option and is not restrictive.

Claims

1. A pressure testing device for a hydraulic expansion cementing completion tool, characterized in that, The pressure testing device includes a lower connector, on which a liquid injection connector is connected. The liquid injection connector is a sleeve structure with one end open and the other end closed. The cavity of the lower connector is connected to the inner cavity of the liquid injection connector. The liquid injection connector is inserted into the sealing surface of the functional part of the hydraulic expansion well completion tool to achieve sealing. A layer of resin fiber material is uniformly wrapped around the outside of the rubber sleeve part, and an outer sleeve is also fitted on the outer layer. Alternatively, the pressure testing device includes a lower connector, one end of which is connected to an upper blind plate. The outer diameter end face of the upper blind plate is provided with a sealing surface. The upper blind plate is inserted into the sealing surface of one end of the hydraulic expansion completion tool to achieve a seal. An upper pressure plate is sleeved in the middle of the lower connector's pipe wall. A first cover plate is provided outside the lower connector, the upper pressure plate, and the upper blind plate. It also includes a lower blind plate and a lower pressure plate. A second cover plate is provided outside the lower blind plate and the lower pressure plate. The first cover plate and the second cover plate have the same structure. They are both cylindrical structures with a limiting step at one end. The limiting step limits the upper or lower pressure plate. The cover plate has a variable diameter at both ends.

2. The pressure testing device for a hydraulic expansion cementing completion tool according to claim 1, characterized in that, One end of the lower connector is welded with a union joint, and the other end of the lower connector has an external thread on the pipe wall, and a sealing surface is provided on the outside of the external thread; The lower connector has a raised connecting part in the middle of its pipe wall, and the raised connecting part has a connecting thread.

3. The pressure testing device for a hydraulic expansion cementing completion tool according to claim 2, characterized in that, The injection connector has an internal thread at one end of its opening, and the internal thread matches the external thread on the lower connector. The sealed end of the injection connector has multiple flow holes along the circumferential direction on the pipe wall, and also has an annular flow groove. The flow groove is connected to the multiple flow holes, and the multiple flow holes are connected to the inner cavity of the injection connector.

4. The pressure testing device for a hydraulic expansion cementing completion tool according to claim 3, characterized in that, The pressure testing device also includes a limiting device, which is a ring with threads on its outer end face. During the pressure test, the limiting device contacts the end face of the closed end of the injection connector, and the limiting device is connected to the bottom end of the functional part of the hydraulic expansion cementing completion tool via threads.

5. The pressure testing device for a hydraulic expansion cementing completion tool according to claim 2, characterized in that, The upper pressure plate is a sleeve with threads on its inner wall. The upper pressure plate is sleeved on the protruding connecting part of the lower connector and connected by threads.

6. The pressure testing device for a hydraulic expansion cementing completion tool according to claim 5, characterized in that, The upper blind plate is a sleeve with threads on its inner wall, and the threads on the inner wall of the upper blind plate match the external threads on the lower connector.

7. The pressure testing device for a hydraulic expansion cementing completion tool according to claim 6, characterized in that, The outer end face of the lower blind plate is provided with a sealing surface.

8. The pressure testing device for a hydraulic expansion cementing completion tool according to claim 7, characterized in that, The first cover plate is fixed by a first retaining ring; The second cover plate is fixed by a second retaining ring.

9. A pressure testing method for a hydraulic expansion cementing completion tool, characterized in that, The pressure testing device described in any one of claims 1-8 is used to conduct a pressure-bearing and sealing test on the rubber sleeve portion and tubing connection of the hydraulic expansion cementing completion tool.

10. The pressure testing method for a hydraulic expansion cementing completion tool according to claim 9, characterized in that, The pressure-bearing seal test of the rubber sleeve of the hydraulic expansion cementing completion tool includes the following steps: (1) Wrap a layer of resin fiber material evenly around the outside of the rubber tube, and then put an outer sleeve on the outer layer; (2) Connect the limiting device to the bottom of the functional part by thread, connect the liquid injection connector to the lower connector by thread, and then directly insert the liquid injection connector into the bottom sealing surface of the functional part, and the end face of the liquid injection connector is in contact with the limiting device. (3) Connect the pipeline to the union joint and start pressurizing. The water flows through the lower joint cavity, the inner cavity of the injection joint, the flow hole and the flow groove into the cavity of the rubber sleeve to conduct a pressure sealing test.

11. The pressure testing method for a hydraulic expansion cementing completion tool according to claim 10, characterized in that, In step (3), during the pressure sealing test, when the rubber sleeve is pressurized to 35 MPa, the pump is stopped and the pressure is stabilized. If there is no obvious pressure drop at this time, it proves that the pressure sealing ability of the rubber sleeve is good. Otherwise, it proves that the pressure sealing ability of the rubber sleeve is poor.

12. The pressure testing method for a hydraulic expansion cementing completion tool according to claim 9, characterized in that, The pressure sealing test of the tubing connection threads of hydraulic expansion cementing completion tools includes the following steps: (1) Close the injection hole channel of the rubber sleeve through the plug seat; (2) Install the pressure testing device into the hydraulic expansion cementing completion tool; (3) Connect the pipeline to the union joint and start pressurization. Water flows through the lower joint into the cavity of the hydraulic expansion cementing tool to conduct a pressure sealing test.

13. The pressure testing method for a hydraulic expansion cementing completion tool according to claim 12, characterized in that, The specific operation in step (2) is as follows: First, connect the upper blind flange to the lower connector by thread and seal with a sealing ring. Then, install the upper blind flange onto the sealing surface of one end of the hydraulic expansion cementing tool. Next, connect the upper pressure plate to the protruding connection part of the lower connector so that the upper pressure plate contacts the end face of one end of the hydraulic expansion cementing tool. Cover with the first cover plate and limit the upper pressure plate by the limiting step of the first cover plate. The first cover plate is fixed by the first fixing ring. The second step is to install the lower blind flange onto the sealing surface of the other end of the hydraulic expansion cementing tool, then bring the lower bearing plate into contact with the other end face of the hydraulic expansion cementing tool, and cover it with the second cover plate. The lower bearing plate is limited by the limiting step of the second cover plate, and the second cover plate is fixed by the second solid ring.

14. The pressure testing method for a hydraulic expansion cementing completion tool according to claim 13, characterized in that, In step (3), the pressure sealing test is specifically as follows: With the upper and lower blind flanges sealing the connection, water can completely enter the tubing of the hydraulic expansion cementing tool. If no pressure drop occurs, it indicates that the tubing connection is well sealed. If fluid leakage or pressure drop occurs between the tubing connections, it indicates that the seal is poor.

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