Dual-channel pressure detection device and method for holding controller holding capacity test

Abstract

The application relates to a double-channel pressure detection device and method for pressure maintaining controller pressure maintaining capacity testing, which comprises a high-pressure container, a threaded pressure ring and a bushing sealing block. The bushing sealing block comprises a sealing main body part and a circular ring part. A first sealing element is arranged between the sealing main body part and the inner wall of the high-pressure container. The circular ring part is used for mounting a valve seat of the pressure maintaining controller, the valve seat can be mounted in the circular ring part, the sealing main body part is provided with a middle through hole and an overflow hole, the inner end of the overflow hole is shielded by the bottom end face of the valve seat, and the inner end face of the sealing main body part is provided with a second sealing element. When the valve seat is mounted in the circular ring part, the second sealing element can be in contact with the bottom of the valve seat. The application has the advantages of strong adaptability and low cost. By replacing non-pressure-bearing bushing sealing blocks with different inner diameters, the testing adaptability of multi-size pressure maintaining controllers can be realized, exclusive tooling is not needed, the device is small in size, light in weight, space-saving, the material and processing cost is greatly reduced, the testing preparation period is shortened, and the testing efficiency of multi-specification products is improved.

Description

Technical Field

[0001] This invention relates to the field of deep in-situ pressure-holding coring technology, and in particular to a dual-channel pressure detection device and method for testing the pressure-holding capacity of a pressure-holding controller. Background Technology

[0002] Exploiting deep resources is not only a major national need but also a core task of the major deep-earth strategy. Compared to shallow resource extraction, deep rock masses face a complex in-situ environment characterized by "high temperatures, high humidity, high pore water pressure, and high temperature," making their nonlinear mechanical behavior more pronounced under these conditions. High geothermal temperatures and high pore water pressure significantly impact the physical and mechanical properties and deformation processes of rock masses. Especially under the coupled effects of high pressure and high temperature, the rheological properties and plastic instability behavior of rock masses differ greatly from those under conventional environments, directly affecting the safe and efficient development of deep resources. Deep in-situ pressure-maintaining coring technology, by acquiring and maintaining pressure-maintained core samples in their in-situ state while simultaneously measuring core composition and state information on-site, is considered one of the most effective means of assessing the properties of conventional and unconventional reservoirs. The pressure-maintaining controller is the core component of deep in-situ pressure-maintaining coring, and its pressure-maintaining capacity and sealing performance are crucial to this technology.

[0003] Two challenges have consistently arisen during the testing of pressure holding controllers: First, when the pressure holding controller is mounted on a test chamber or fixture for testing, the valve seat sealing surface of the pressure holding controller must match the sealing surface of the test platform. Therefore, traditional testing methods can only be implemented by customizing a dedicated test chamber or fixture for a single-size pressure holding controller. Figure 1 As shown, the device is not only bulky and occupies a lot of experimental space, but also has high processing costs and a long cycle. Secondly, when the pressure holding controller leaks, it is impossible to accurately identify whether the leak source is the valve cover or the valve seat, which brings great difficulties to the seal failure analysis and structural optimization. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a dual-channel pressure detection device and method for testing the pressure holding capacity of a pressure holding controller.

[0005] This invention is achieved through the following technical solution:

[0006] The dual-channel pressure testing device for testing the pressure holding capacity of a pressure holding controller provided in this application includes a high-pressure vessel with an installation cavity and a liquid cavity, a threaded pressure ring that can be threadedly connected to the high-pressure vessel, and a bushing sealing block that can be installed in the installation cavity of the high-pressure vessel. The outer wall of the high-pressure vessel has a medium hole communicating with the liquid cavity; the inner wall of the high-pressure vessel has an inner wall step for limiting one end of the bushing sealing block and the pressure holding controller; the threaded pressure ring is used to limit the other end of the bushing sealing block; the bushing sealing block includes an integrally manufactured sealing body and a circular ring, and there is a first... A sealing element; the circular ring portion is used to install the valve seat of the pressure holding controller, and the valve seat sealing ring can seal and cooperate with the inner circular surface of the circular ring portion; the sealing body portion has a through hole and an overflow hole, the inner ends of the through hole and the overflow hole are connected to the interior of the circular ring portion, and the outer ends of the through hole and the overflow hole are connected to the outer end face of the bushing sealing block. When the valve seat is installed in the circular ring portion, the inner end of the through hole can communicate with the interior of the valve seat, and the inner end of the overflow hole is blocked by the bottom end face of the valve seat; a second sealing element is installed on the inner end face of the sealing body portion, and the overflow hole is located around the second sealing element. When the valve seat is installed in the circular ring portion, the second sealing element can contact the bottom of the valve seat.

[0007] Optionally, the outer diameter of the sealing body of the bushing sealing block is larger than the outer diameter of the circular ring, and a third sealing element is installed on the inner end face of the sealing body of the bushing sealing block, with the inner end opening of the overflow hole located between the second and third sealing elements.

[0008] Optionally, the first seal is an O-ring + PEEK retaining ring assembly. Preferably, the PEEK retaining ring is located outside the O-ring.

[0009] Optionally, the second seal may include an O-ring.

[0010] Optionally, the third seal is a metal C-ring.

[0011] Optionally, a guide groove is provided at the outer end of the overflow hole.

[0012] Optionally, a guide groove is provided at the outer end of the through hole.

[0013] Optionally, the high-pressure container is cylindrical, with an installation cavity at each end and a liquid cavity in the middle. Both ends of the high-pressure container are equipped with bushing sealing blocks and threaded pressure rings.

[0014] The dual-channel pressure detection method for testing the pressure holding capacity of a pressure holding controller provided in this application includes the following steps:

[0015] S1. Select the bushing sealing block with the corresponding inner diameter according to the outer diameter of the pressure holding controller to be tested, and install the first sealing element and the second sealing element onto the bushing sealing block.

[0016] S2, After closing the pressure holding controller, place it into the circular ring of the bushing sealing block, so that the valve seat and the second seal are tightly fitted. Install the bushing sealing block and the pressure holding controller into the high pressure vessel, and fix the threaded pressure ring to the high pressure vessel thread.

[0017] S3, inject test medium at a preset pressure through the medium hole of the high-pressure vessel. The test medium enters the area above the pressure holding controller to maintain the pressure holding state. Observe the liquid discharge from the overflow hole and the through hole.

[0018] If liquid is discharged only from the central through hole, it is determined that the valve cover is leaking; if liquid is discharged only from the overflow hole, it is determined that the valve seat is leaking; if liquid is discharged from both the overflow hole and the central through hole, it is determined that both the valve cover and the valve seat are leaking; if no liquid is discharged from either the overflow hole or the central through hole, the pressure holding performance of the pressure holding controller is determined to be qualified.

[0019] Compared with the prior art, this application has at least the following beneficial effects:

[0020] 1. This application has strong adaptability and low cost: by replacing non-pressure bushing sealing blocks with different inner diameters, it can achieve test adaptation of pressure holding controllers of multiple sizes. There is no need to customize special tooling. The device is small in size, light in weight, and saves space. Material and processing costs are greatly reduced, while the test preparation cycle is shortened and the test efficiency of multi-specification products is improved.

[0021] 2. This application enables precise identification of leak locations: by isolating the leak area through a seal and combining the dual-channel design of the overflow hole and the through hole, the leak source of the valve cover and valve seat can be quickly and accurately distinguished, providing accurate data support for seal failure analysis and product structure optimization, and significantly shortening the problem investigation and optimization cycle;

[0022] 3. This application features reliable sealing and stable testing: The O-ring + PEEK retaining ring assembly optimizes the sealing structure, preventing deformation and overflow of the sealing components and improving sealing reliability; the matching design of the metal C-ring and the threaded pressure ring ensures that there is no displacement or loosening during the pressure holding controller test, resulting in high accuracy and good repeatability of test results.

[0023] 4. This application is easy to operate and highly practical: the device has a simple structure, convenient assembly and testing steps, requires no complicated operating skills, and can be widely used in the production inspection, factory testing and performance verification of pressure holding controllers during the research and development process, with a wide range of applications.

[0024] Of course, implementing any of the embodiments of the present invention does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a dedicated test fixture for a single-size pressure holding controller in the prior art;

[0027] Figure 2 This is a schematic diagram of the dual-channel pressure detection device of the present invention used for testing the pressure holding capacity of pressure holding controllers of different sizes in an embodiment. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. It should also be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0030] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to 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.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 based on the specific circumstances.

[0032] Please see Figure 2 This embodiment discloses a dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller, comprising a high-pressure container 1, a threaded pressure ring 2, and a bushing sealing block 3. The high-pressure container 1 has an installation cavity for mounting the threaded pressure ring 2 and the bushing sealing block 3, and a liquid cavity for storing high-pressure liquid, the installation cavity and the liquid cavity being in communication. The outer wall of the high-pressure container 1 has a medium hole 11, which communicates with the liquid cavity.

[0033] The inner end of the bushing sealing block 3 is restricted by the inner wall step of the high pressure vessel 1, and the outer end of the bushing sealing block 3 is restricted by the threaded pressure ring 2. The threaded pressure ring 2 is threadedly connected to the high pressure vessel 1. Through the combined action of the threaded pressure ring 2 and the inner wall step, the bushing sealing block 3 is fixedly installed.

[0034] The bushing sealing block 3 includes an integrally manufactured sealing body and a circular ring 30. There is a first sealing element 4 between the sealing body and the inner wall of the high-pressure vessel 1, which is used to achieve a seal between the outer circular surface of the bushing sealing block 3 and the inner circular surface of the high-pressure vessel 1.

[0035] The circular ring 30 is used to install the valve seat 71 of the pressure holding controller 7. The valve seat 71 can be installed in the circular ring 30, and the valve seat sealing ring 73 of the valve seat 71 can be sealed and fitted with the inner circular surface of the circular ring 30 of the corresponding size.

[0036] The sealing body has a central through hole 31 and an overflow hole 32. The inner end of the central through hole 31 is connected to the interior of the circular ring 30, and the outer end of the central through hole 31 is connected to the outer end face of the bushing sealing block 3. When the valve seat 71 is installed in the circular ring 30, the central through hole 31 is connected to the interior of the valve seat 71.

[0037] The inner end of the overflow hole 32 is connected to the interior of the circular ring 30, and the outer end of the overflow hole 32 passes through the outer end face of the bushing sealing block 3. When the valve seat 71 is installed in the circular ring 30, the inner end of the overflow hole 32 is blocked by the bottom end face of the valve seat 71.

[0038] A second sealing element 5 is installed on the inner end face of the sealing body, and the inner opening of the overflow hole 32 is located on the periphery of the second sealing element 5. When the valve seat 71 is installed in the circular ring portion 30, the second sealing element 5 contacts the bottom of the valve seat 71 to isolate the leakage area of ​​the valve seat from the leakage area of ​​the valve cover. The overflow hole 32 corresponds to the bottom sealing area of ​​the valve seat 71 and is used to drain the liquid leaking from the valve seat 71; the through hole 31 corresponds to the area below the valve cover 72 and is used to drain the liquid leaking from the valve cover 72. Therefore, the overflow hole 32 can be used to detect whether the valve seat 71 is leaking, and the through hole 31 is used to detect whether the valve cover 72 is leaking.

[0039] In some embodiments, the outer diameter of the sealing body portion of the bushing sealing block 3 is larger than the outer diameter of the circular ring portion 30, and a third sealing element 6 is installed on the inner end face of the sealing body portion of the bushing sealing block 3. The inner end opening of the overflow hole 32 is located between the second sealing element 5 and the third sealing element 6. The third sealing element 6 is used to make sealing contact with the inner wall step of the high-pressure vessel 1 to seal between the bushing sealing block 3 and the high-pressure vessel 1.

[0040] In some embodiments, the first seal 4 includes an O-ring + PEEK retainer assembly. Preferably, the PEEK retainer is located outside the O-ring to prevent the O-ring from deforming and overflowing under pressure, thereby improving sealing reliability.

[0041] In some embodiments, the second seal 5 includes an O-ring.

[0042] In some embodiments, the third seal 6 is a metal C-ring. Preferably, the metal C-ring 4 is made of stainless steel and has a compression sealing function.

[0043] The bushing seal block 3 is a non-pressure-bearing structure. By replacing the bushing seal block 3 with different inner diameters, it can be adapted to pressure holding controllers 7 of different sizes.

[0044] This invention features a compact structure, small size, and low cost. It can be quickly adapted to pressure holding controllers of various sizes, while also enabling precise location of leakage sources. This provides a reliable basis for seal failure analysis and structural optimization, significantly improving testing efficiency and accuracy.

[0045] In some embodiments, the overflow hole 32 has a diameter of 3 mm, and the through hole 31 has a diameter of 20 mm. In some embodiments, a guide groove is provided at the outer end of the overflow hole 32 and the through hole 31 to facilitate the rapid discharge and observation of leaked liquid.

[0046] In some embodiments, the high-pressure container 1 is cylindrical, with an installation cavity at each end and a liquid cavity in the middle. Both ends of the high-pressure container 1 are equipped with bushing sealing blocks 3, which can simultaneously test two pressure holding controllers 7, resulting in higher working efficiency.

[0047] Based on the aforementioned dual-channel pressure detection device for testing the pressure holding capacity of pressure holding controllers, this embodiment discloses a method for testing the pressure holding capacity of pressure holding controllers of different sizes, comprising the following steps:

[0048] S1. Based on the outer diameter of the pressure holding controller 7 to be tested, select the bushing sealing block 3 with the corresponding inner diameter, install the first sealing element 4 into the side sealing surface of the bushing sealing block 3, and at the same time install the second sealing element 5 in the corresponding contact area at the bottom of the valve seat 71.

[0049] S2, after closing the pressure holding controller 7, place it into the circular ring 30 of the bushing sealing block 3, so that the valve seat 71 is tightly fitted with the second sealing element 5, install the bushing sealing block 3 and the pressure holding controller 7 into the high pressure container 1, and fix the threaded pressure ring 2 to the high pressure container 1 by threads. The valve cover 7 is pressed and kept closed by the axial inner wall step of the high pressure container 1, and the pressure holding controller 7 is pressed and fixed in the high pressure container 1, completing the pre-test assembly;

[0050] S3, inject test medium at a preset pressure through medium hole 11 of high pressure container 1. The test medium enters the area above pressure holding controller 7 and maintains pressure holding state. Observe the liquid discharge of overflow hole 32 and central through hole 31.

[0051] S4. If liquid is discharged only from the central through hole 31, it is determined that the valve cover 72 is leaking; if liquid is discharged only from the overflow hole 32, it is determined that the valve seat 71 is leaking; if liquid is discharged from both the overflow hole 32 and the central through hole 31, it is determined that both the valve cover 72 and the valve seat 71 are leaking; if no liquid is discharged from either the overflow hole 32 or the central through hole 31, the pressure holding performance of the pressure holding controller 7 is determined to be qualified.

[0052] In some embodiments, the test medium in step S3 is water, oil, or other liquids.

[0053] In some embodiments, in step S2, the pressure holding controller 7 is kept closed in ways including but not limited to the following two: Method 1, closing the valve cover 72 and spot welding a metal baffle 8 onto the valve seat 71 to prevent the valve cover 72 from coming off. Method 2, adding a preload spring, such as... Figure 1 As shown.

[0054] In some embodiments, in step S4, collection containers can be set at the outlets of overflow hole 32 and through hole 31 respectively, and the leakage situation can be quickly determined by observing whether there is liquid in the collection containers.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller, characterized in that, include: A high-pressure vessel having an installation cavity and a liquid cavity; A threaded pressure ring that can be threaded into a high-pressure vessel; A bushing sealing block that can be installed in the mounting cavity of a high-pressure vessel; The outer wall of the high-pressure vessel has a medium hole that communicates with the liquid cavity; The inner wall of the high-pressure vessel has an inner wall step for limiting one end of the bushing sealing block, and the threaded pressure ring is used to limit the other end of the bushing sealing block. The bushing sealing block includes an integrally manufactured sealing body and a circular ring. The circular ring is used to install the valve seat of the pressure holding controller, and the valve seat sealing ring of the valve seat can seal and cooperate with the inner circular surface of the circular ring. The sealing body has a central through hole and an overflow hole. The inner ends of the central through hole and the overflow hole are connected to the interior of the circular ring. The outer ends of the central through hole and the overflow hole are connected to the outer end face of the bushing sealing block. When the valve seat is installed in the circular ring, the inner end of the central through hole can communicate with the interior of the valve seat, and the inner end of the overflow hole is blocked by the bottom end face of the valve seat. There is a first sealing element between the sealing body and the inner wall of the high-pressure vessel, and a second sealing element is installed on the inner end face of the sealing body. The overflow hole is located around the second sealing element. When the valve seat is installed in the circular ring, the second sealing element can contact the bottom of the valve seat.

2. The dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller according to claim 1, characterized in that, The outer diameter of the sealing body of the bushing sealing block is larger than the outer diameter of the circular ring. A third sealing element is installed on the inner end face of the sealing body of the bushing sealing block, and the inner end opening of the overflow hole is located between the second sealing element and the third sealing element.

3. The dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller according to claim 1, characterized in that, The first sealing element is an O-ring + PEEK retaining ring assembly.

4. The dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller according to claim 3, characterized in that, The PEEK retaining ring is located outside the O-ring.

5. The dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller according to claim 1, characterized in that, The second seal includes an O-ring.

6. The dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller according to claim 2, characterized in that, The third sealing element is a metal C-ring.

7. The dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller according to claim 1, characterized in that, A guide groove is provided at the outer end of the overflow hole.

8. The dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller according to claim 1, characterized in that, A flow guide groove is provided at the outer end of the through hole.

9. The dual-channel pressure detection device for testing the pressure holding capacity of a pressure holding controller according to claim 1, characterized in that, The high-pressure container is cylindrical, with an installation cavity at each end and a liquid cavity in the middle. Both ends of the high-pressure container are equipped with bushing sealing blocks and threaded pressure rings.

10. A dual-channel pressure detection method for testing the pressure holding capacity of a pressure holding controller, characterized in that, The dual-channel pressure detection device for testing the pressure holding capacity of the pressure holding controller, as described in any one of claims 1-9, is adopted. Includes the following steps: S1. Select the bushing sealing block with the corresponding inner diameter according to the outer diameter of the pressure holding controller to be tested, and install the first sealing element and the second sealing element onto the bushing sealing block. S2, After closing the pressure holding controller, place it into the circular ring of the bushing sealing block, so that the valve seat and the second seal are tightly fitted. Install the bushing sealing block and the pressure holding controller into the high pressure vessel, and fix the threaded pressure ring to the high pressure vessel thread. S3, inject test medium at a preset pressure through the medium hole of the high-pressure vessel. The test medium enters the area above the pressure holding controller to maintain the pressure holding state. Observe the liquid discharge from the overflow hole and the through hole. If liquid is discharged only from the central through hole, it is determined that the valve cover is leaking; if liquid is discharged only from the overflow hole, it is determined that the valve seat is leaking; if liquid is discharged from both the overflow hole and the central through hole, it is determined that both the valve cover and the valve seat are leaking; if no liquid is discharged from either the overflow hole or the central through hole, the pressure holding performance of the pressure holding controller is determined to be qualified.

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