A magnetron multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device and testing method

Abstract

The present application relates to a kind of magnetic control multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device and testing method, including base, annular guide rail installed on base, coring fixing device installed on annular guide rail, for driving coring fixing device to carry out ring movement in turn to adjust coring angle of coring tool, linear drive mechanism for driving the axial movement of the central rod of coring tool.Liquid is transported to the inside of coring tool by liquid supply system and circulates without stopping, the environment inside coring tool is modulated into preset deep environment, then by adjusting pump pressure and liquid composition inside liquid supply system, the triggering effect and self-sealing capacity of magnetic control self-triggering are tested under different deep downhole environments and different coring angles, and the initial pre-tightening force required by pressure-maintaining controller under different liquid environments can also be verified.The present application can monitor the application effect of magnetic control technical scheme in different environments, and is beneficial to the application of magnetic control technical scheme in engineering.

Description

Technical Field

[0001] This invention relates to the technical field of pressure-holding core sampling, and in particular to a magnetically controlled multidirectional pressure-holding core sampling self-triggering and self-sealing monitoring device and testing method. Background Technology

[0002] The pressure holding controller is a core component in pressure holding coring technology. In deep earth and deep sea coring processes, it often fails due to the resistance of the fluid environment (drilling fluid, seawater, etc.), which triggers its failure or causes the initial self-sealing to fail, ultimately leading to the failure of the entire pressure holding process.

[0003] To address this, our team innovatively developed a magnetically controlled multidirectional pressure-holding coring technology. For example, Chinese patent document CN214576847U discloses a coring device that relies on magnetic triggering to achieve pressure holding. This device features a second magnetic component on the valve disc, a first magnetic component on the outer cylinder corresponding to the second magnetic component that generates a repulsive force, and a third magnetic component on the valve seat that generates an attractive force. Magnetic force enhances the self-triggering force of the pressure-holding controller, enabling it to overcome fluid resistance and its own weight to achieve self-triggering, as well as self-sealing after triggering, thus achieving pressure holding. However, in complex fluid environments, due to variations in drilling fluid flow rate and the influence of high temperature and high pressure, the application effect of the magnetic control technology in different environments cannot be monitored, affecting its application in engineering projects. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a magnetically controlled multidirectional pressure-holding core sampling self-triggering and self-sealing monitoring device and testing method.

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

[0006] This application provides a magnetically controlled multidirectional pressure-holding coring self-triggering and self-sealing monitoring device, including a base, an annular guide rail mounted on the base, a coring fixing device mounted on the annular guide rail and movable circumferentially along the annular guide rail, an annular drive mechanism for driving the coring fixing device to perform annular movement and thereby adjusting the coring angle of the coring device, and a linear drive mechanism for driving the center rod of the coring device to move axially. The coring fixing device is used to install and fix the coring device.

[0007] Optionally, the core-collecting and fixing device includes a movable stage, a support rod, a support platform, and a clamping mechanism. The movable stage is connected to an annular guide rail and can move circumferentially along the annular guide rail under the action of the circumferential drive mechanism. The bottom of the support rod is connected to the movable stage, and the top of the support rod is connected to the support platform. The clamping mechanism is mounted on the support platform for clamping and fixing the core collector.

[0008] Optionally, the support platform has a through hole adapted to the core extractor.

[0009] The core sampler includes an outer cylinder, a core cylinder, a pressure holding controller, and a central rod. The pressure holding controller includes a valve seat and a valve disc. The valve seat is installed inside the outer cylinder, and one side of the valve disc is connected to one end of the valve seat. A first magnetic element is provided on the valve disc, and a second magnetic element that generates a repulsive force against the first magnetic element is installed on the outer cylinder at the position corresponding to the first magnetic element.

[0010] The linear drive mechanism includes a vertical guide rail, a vertical slider that slides with the vertical guide rail, and a drive device. The drive device is connected to the vertical slider. A sensor integration structure is provided at the upper end of the central rod, and a pressure sensor is integrated in the sensor integration structure. The back of the sensor integration structure is connected to the vertical slider, the front of the sensor integration structure holds the central rod, and the end of the central rod contacts the pressure sensor.

[0011] Optionally, a sealing ring is installed on the valve seat.

[0012] Optionally, the valve seat has a third set of magnetic elements for generating an attractive force on the first magnetic element.

[0013] This application provides a magnetically controlled multi-directional pressure-holding core sampling self-triggering and self-sealing test method, which adopts a liquid supply system and the above-mentioned magnetically controlled multi-directional pressure-holding core sampling self-triggering and self-sealing monitoring device. The liquid supply system includes a water tank, a pump group, a control valve group and a matching pipeline system. The upper liquid inlet of the core sampler is connected to the water tank through a liquid inlet pipe, and the lower liquid outlet of the core sampler is connected to the water tank through a liquid outlet pipe.

[0014] The magnetic self-triggered test method includes the following steps:

[0015] With the pressure holding controller open, the core cylinder is located inside the valve seat, and the core sampler is adjusted to any angle via the circumferential drive mechanism;

[0016] Adjust the pump speed to start circulating the liquid environment through the liquid supply system. After circulating for a period of time, the center rod is lifted by the linear drive mechanism. Then observe the pump pressure parameters of the liquid supply system. If the pump pressure increases significantly, it means that the pressure holding controller has achieved self-trigger closure; otherwise, it has not achieved self-trigger.

[0017] Then change the pump speed and repeat the above steps to test the magnetic self-triggering effect at different core angles under different flow rate environments.

[0018] The magnetic self-sealing test method includes the following steps: Based on magnetic self-triggering, observe the pump pressure change. If the pump pressure continues to increase, it indicates that the initial self-sealing has been achieved; otherwise, the initial self-sealing has not been achieved.

[0019] The initial self-sealing force test includes the following steps: After self-triggering, the linear drive mechanism moves the central rod downward, causing the core cylinder to press back onto the closed valve, forming an initial pre-tightening. Since the core cylinder is connected to the central rod, a pressure sensor at the top of the central rod displays the pressure. Then, liquid is continuously added to the core extractor through the liquid supply system, and the pump pressure is observed. If the pump pressure slowly decreases, it indicates that the initial sealing force is insufficient, and it can be adjusted again. The initial range of the initial pre-tightening force is determined using the least binary method. Then, the above cycle is repeated every 1N to find the ideal initial pre-tightening force value, thereby deducing the required magnetic force for the magnetically controlled self-sealing and optimizing the magnetic control technology. Under the ideal initial pre-tightening force, the pressure holding controller can achieve initial sealing.

[0020] Preferably, the water tank is equipped with a heating device.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] This application can verify the self-triggering and self-sealing effects of a magnetically controlled pressure-holding controller under different in-situ environments in deep reservoirs, including different corrosive liquids, different drilling fluid flow rates, different temperatures, and different pressures. It can also test the initial self-sealing force and monitor the application effect of the magnetically controlled technology solution in different environments, which is beneficial to the application of the magnetically controlled technology solution in engineering. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a perspective view of a magnetically controlled multi-directional pressure-holding core sampling self-triggering and self-sealing monitoring device in the embodiment;

[0025] Figure 2 This is a longitudinal sectional view of a magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device in the embodiment;

[0026] Figure 3 for Figure 2 Sectional view at point AA;

[0027] Figure 4 This is a three-dimensional view of the core-retrieving fixing device and the core-retrieving tool in the embodiment;

[0028] Figure 5 This is a cross-sectional view of the core extractor when the pressure holding controller is turned on in the embodiment;

[0029] Figure 6 This is a schematic diagram of the core extractor and liquid supply system in the embodiment;

[0030] Figure 7 This is a cross-sectional view of the core extractor after the pressure holding controller self-triggers closure in the embodiment;

[0031] Figure 8 This is a cross-sectional view of the core sampler when the core cylinder is back-pressed onto the closed valve disc during the verification of the initial self-sealing force in the example. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] like Figures 1 to 3As shown in the figure, the magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device disclosed in this embodiment includes a base 1, an annular guide rail 2, a coring fixing device 3, an annular drive mechanism, a linear drive mechanism 4, and a coring device 5. The axis of the annular guide rail 2 is parallel to the horizontal plane.

[0037] Among them, such as Figure 5 As shown, the core sampler 5 includes an outer cylinder 51, a core cylinder 52, a pressure holding controller, and a center rod 53. The pressure holding controller includes a valve seat 54 and a valve disc 55. The valve seat 54 is installed inside the outer cylinder 51 and has a sealing ring. One side of the valve disc 55 is connected to one end of the valve seat 54. The valve disc 55 is provided with a first magnetic element 56. A second magnetic element 57 that generates a repulsive force against the first magnetic element 56 is installed on the outer cylinder 51 at the position corresponding to the first magnetic element 56. The valve seat 54 has a third magnetic element group 58 that generates an attractive force against the first magnetic element 56. In the initial state, the core cylinder 52 is located inside the valve seat 54, and the valve disc 55 is confined between the core cylinder 52 and the outer cylinder 51.

[0038] The second magnetic component 57, the first magnetic component 56, and the third magnetic component group 58 are permanent magnets.

[0039] It is worth noting that the third magnetic component group 58 can have different arrangements to generate different magnetic forces. This is conventional technology in the field and will not be elaborated further here.

[0040] The annular guide rail 2 is mounted on the base 1, and the axis of the annular guide rail 2 is parallel to the horizontal plane.

[0041] The core-taking fixing device 3 is mounted on the annular guide rail 2 and can move circumferentially along the annular guide rail 2. The circumferential driving mechanism is connected to the core-taking fixing device 3 to drive the core-taking fixing device 3 to move circumferentially along the annular guide rail 2.

[0042] The core extractor 5 and the linear drive mechanism 4 are mounted on the core extraction fixing device 3. The linear drive mechanism 4 is used to drive the central rod 53 of the core extractor 5 to move linearly.

[0043] The linear drive mechanism 4 includes a vertical guide rail, a vertical slider that slides with the vertical guide rail, and a drive device. The drive device is connected to the vertical slider and is used to drive the vertical slider to move up and down along the vertical guide rail. The center rod 53 is connected to the vertical slider.

[0044] The driving device can be a linear motor, a pneumatic cylinder, or a hydraulic cylinder, etc., which are conventional technologies in this field and will not be described in detail here.

[0045] In some embodiments, the circumferential drive mechanism includes a stepper motor 71 mounted on the core-retrieving fixing device 3 and a gear 72 connected to the output of the stepper motor. There is an annular toothed rail 73 on the annular guide rail 2. The gear 72 meshes with the annular toothed rail 73. The rotation of the stepper motor 71 drives the gear 72 to rotate. The gear 72 moves along the annular toothed rail 73, which drives the core retriever 5 to rotate in the vertical plane, thereby adjusting the core-retrieving angle.

[0046] In some embodiments, such as Figure 4 As shown, the core-retrieving fixing device 3 includes a movable stage 31, a support rod 32, a support platform 33, and a clamping mechanism 34. The movable stage 31 is slidably connected to the annular guide rail 2 and can move annularly along the annular toothed track 73 under the action of the circumferential drive mechanism. The bottom of the support rod 32 is connected to the movable stage 31, and the top of the support rod 32 is connected to the support platform 33. The clamping mechanism 34 is mounted on the support platform 33 to clamp and fix the core extractor 5. The support platform 33 has a through hole adapted to the core extractor 5. The core extractor 5 is installed in the through hole and fixed by the clamping mechanism 34, so that it can rotate with the core-retrieving fixing device 3 along the circumferential drive mechanism to realize the adjustment of the core-retrieving angle. The support platform 33 has a linear guide rail, and the linear guide rail has a linear slider. The top of the center rod 53 is connected to the linear slider.

[0047] In some embodiments, support rods 32 are connected to both sides of the support platform 33, and the upper ends of the support rods 32 are connected to the support platform 33 via a rotating shaft. The axis of the rotating shaft is perpendicular to the axis of the annular guide rail 2. Rotating the support platform 33 around the rotating shaft can adjust the centering angle. In conjunction with the circumferential adjustment of the annular guide rail 2 and the circumferential drive mechanism, the simulation of centering at any angle can be achieved. Of course, the support platform 33 is equipped with a rotary drive motor 35, which is connected to the rotating shaft. The rotary drive motor 35 can drive the support platform 33 to rotate around the rotating shaft.

[0048] The operating method of the magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device is as follows:

[0049] Experimental preparation: A separate fluid supply system is required to simulate the downhole environment. For example... Figure 6 As shown, the liquid supply system includes a water tank 6, a pump set, a control valve set, and a supporting piping system. Different liquids can be placed in the water tank 6. Preferably, the water tank is equipped with a heating device, which can simulate different reservoir environments. The upper inlet of the core extractor 5 is connected to the water tank 6 via an inlet pipe, and the lower outlet of the core extractor 5 is connected to the water tank 6 via an outlet pipe. By continuously circulating the liquid into the core extractor 5, the internal environment of the core extractor 5 is modulated into a preset deep-earth environment, allowing the following three experiments to be performed:

[0050] Experiment 1: Verifying the magnetic self-triggering and self-sealing function of the pressure holding controller: By adjusting the pump pressure, the triggering effect of the magnetic self-triggering was tested under different liquid flow rates and core angles. Specifically, the following steps were included:

[0051] First, such as Figure 5 As shown, the pressure holding controller is turned on, the core cylinder 52 is located in the valve seat 54, and the core sampler 5 is adjusted to any angle through the circumferential drive mechanism and the rotary drive motor 35.

[0052] Then, the liquid environment is circulated through the liquid supply system until the internal pressure of the core extractor 5 matches the preset environmental parameters, which should generally be greater than 2 hours. Then, the magnetic self-triggering effect is tested by pulling the center rod 53 through the linear drive mechanism 4. Then, the pump pressure parameters of the liquid supply system are observed. If the pump pressure increases significantly, it means that self-triggering and self-sealing have been achieved, because only when both self-triggering and self-sealing are achieved will the pump pressure increase significantly. Otherwise, it means that the magnetic control technology has failed.

[0053] Self-triggering principle: such as Figure 7 As shown, when the core cylinder 52 is raised above the valve disc 55, the valve disc 55 loses the restriction of the core cylinder 52, and the repulsive force of the second magnetic element 57 on the first magnetic element 56 causes the valve disc 55 to close and rotate; when the valve disc 55 rotates to a certain angle, the first magnetic element 56 is attracted by the third magnetic element group 58, causing the valve disc 55 to quickly close with the valve seat 54.

[0054] Experiment 3: Verification of Initial Self-Sealing Force: Integrating a permanent magnet on the valve seat 54 weakens its ultimate pressure resistance. Therefore, when integrating a permanent magnet, it is generally desirable for its size to be as small as possible. However, the size of the permanent magnet determines the self-sealing performance of the pressure holding controller. Since the sealing performance of the valve seat sealing ring after heating may affect the magnitude of the initial self-sealing force, it is necessary to verify how much initial preload the pressure holding controller requires in different liquid environments to achieve self-sealing. Therefore, without installing the third magnetic component group 58, the self-triggering action is completed first, and then the linear drive mechanism 4 drives the central rod 53 to move downward, causing the core cylinder 52 to press back onto the closed valve disc 55, forming the initial preload. Figure 8As shown; because the core cylinder 52 is connected to the central rod 53, the central rod 53 has a sensor integrated structure 8 at its top. The pressure sensor is integrated into the sensor integrated structure 8. The back of the sensor integrated structure 8 is connected to the vertical slider by a thread, and the front is clamped to the central rod 53 by a clamp. The end of the central rod 53 is in contact with the pressure sensor, which can display the pressure; the initial force of the pressure sensor is 0. When lifted, the pressure sensor will not be compressed; when pressed down, the pressure sensor is in contact with the end of the central rod 53, and the displayed value is the magnitude of the initial pre-tightening force. Then, the liquid supply system continues to add liquid to the inside of the core extractor 5, and the pump pressure is observed. If the pump pressure slowly decreases, it indicates that the initial sealing force is insufficient. The linear drive mechanism 4 can be used again to drive the central rod 53 down to increase the pressure of the core cylinder 52 on the valve disc 55. The initial value range of the initial pre-tightening force is determined by the least binary method, and then the above cycle is repeated every 1N to find the ideal initial pre-tightening force value. Under the action of the ideal initial pre-tightening force, the pressure holding controller can achieve the initial seal. The required magnetic force for magnetic self-sealing can be deduced by using the ideal initial preload value, thus optimizing the magnetic control technology.

[0055] The required initial self-sealing force is verified by measuring the pressure sensor value on the central rod 53. The magnetic field direction of the third magnetic component 58 is adjusted, and a safety factor is added to ensure that the initial self-sealing force F = central rod * safety factor Q.

[0056] The safety factor is usually 1-3; preferably, the safety factor is 1.5.

[0057] This application can verify the self-triggering and self-sealing effects of the pressure holding controller under different liquids, drilling fluid flow rates, temperatures, and pressures, and can test the initial self-sealing force. It can also monitor the application effect of the magnetic control technology solution in different environments, which is beneficial to the application of the magnetic control technology solution in engineering.

[0058] 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 magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device, characterized in that, include: Base (1); An annular guide rail (2) is mounted on the base (1); A core-fixing device (3) is installed on the annular guide rail (2) and can move circumferentially along the annular guide rail (2). The core-fixing device (3) is used to install and fix the core extractor (5). A circumferential drive mechanism for driving the core-collecting fixing device (3) to perform circumferential movement and thereby adjusting the core-collecting angle of the core-collecting device (5); A linear drive mechanism (4) for axially moving the central rod (53) of the core extractor (5); and The liquid supply system includes a water tank (6), a pump group, a control valve group and a matching pipeline system. The water tank (6) may or may not be equipped with a heating device. The upper inlet of the core extractor (5) is connected to the water tank (6) through an inlet pipe, and the lower outlet of the core extractor (5) is connected to the water tank (6) through an outlet pipe. The composition of the liquid in the water tank (6) can be changed, and the flow rate of the liquid supply system can be changed, so as to test the magnetic self-triggering effect under different flow rates, different liquid compositions, and different core angles.

2. The magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device according to claim 1, characterized in that, The core-fixing device (3) includes a movable stage (31), a support rod (32), a support platform (33), and a clamping mechanism (34). The movable stage (31) is connected to the annular guide rail (2) and can move in a ring along the annular guide rail (2) under the action of the circumferential drive mechanism. The bottom of the support rod (32) is connected to the movable platform (31), and the top of the support rod (32) is connected to the support platform (33). The clamping mechanism (34) is mounted on the support platform (33) for clamping and fixing the core extractor (5).

3. The magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device according to claim 2, characterized in that, The support platform (33) has a through hole that is compatible with the core extractor (5).

4. The magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device according to claim 2, characterized in that, It also includes a rotary drive motor (35), the upper end of the support rod (32) is rotatably connected to the support platform (33) through a rotary shaft, and the axis of the rotary shaft is perpendicular to the axis of the annular guide rail (2); the rotary drive motor (35) is connected to the rotary shaft, and the rotary drive motor (35) can drive the support platform (33) to rotate around the rotary shaft.

5. A magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device according to any one of claims 1-4, characterized in that, It also includes a core extractor (5), which includes an outer cylinder (51), a core cylinder (52), a magnetic pressure holding controller, and a center rod (53). The magnetic pressure holding controller includes a valve seat (54) and a valve disc (55). The valve seat (54) is installed inside the outer cylinder (51), and one side of the valve disc (55) is connected to one end of the valve seat (54). A first magnetic element (56) is provided on the valve disc (55), and a second magnetic element (57) that generates a repulsive force on the first magnetic element (56) is installed on the outer cylinder (51) at the position corresponding to the first magnetic element (56). The linear drive mechanism (4) includes a vertical guide rail, a vertical slider that slides with the vertical guide rail, and a drive device, wherein the drive device is connected to the vertical slider. The upper end of the central rod (53) is provided with a sensor integration structure (8), in which the pressure sensor is integrated; the back of the sensor integration structure (8) is connected to the vertical slider, the front of the sensor integration structure (8) holds the central rod (53), and the end of the central rod (53) is in contact with the pressure sensor.

6. The magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device according to claim 5, characterized in that, A sealing ring is installed on the valve seat (54).

7. The magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device according to claim 5, characterized in that, The valve seat (54) has a third magnetic element group (58) for generating an attractive force on the first magnetic element (56).

8. A magnetically controlled multi-directional pressure-holding core sampling self-triggering and self-sealing test method, characterized in that, The magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing monitoring device as described in any one of claims 5-7 is used. The magnetically controlled self-triggering test method includes the following steps: When the pressure holding controller is turned on, the core cylinder (52) is located inside the valve seat (54). The core sampler (5) is adjusted to a certain angle by the circumferential drive mechanism to simulate the core sampling condition. Adjust the pump pressure and start circulating the liquid environment through the liquid supply system until the pressure inside the core extractor is consistent with the preset environmental parameters. Then, drive the center rod (53) to lift through the linear drive mechanism (4). Then observe the pump pressure parameters of the liquid supply system. If the pump pressure increases significantly, it means that the pressure holding controller has achieved self-triggering and self-sealing. Otherwise, it means that the magnetic control closure has failed. Then, change the pump pressure and the liquid composition in the water tank (6), repeat the above steps, and test the magnetic self-triggering effect at different sampling angles under different flow rates and different liquid composition environments.

9. The magnetically controlled multi-directional pressure-holding core sampling self-triggering and self-sealing test method according to claim 8, characterized in that, The magnetic self-sealing test method includes the following steps: Based on magnetic self-triggering, observe the pump pressure change. If the pump pressure continues to increase, it indicates that self-triggering and initial self-sealing have been achieved; otherwise, initial self-sealing has not been achieved.

10. A magnetically controlled multi-directional pressure-holding coring self-triggering and self-sealing test method according to claim 8 or 9, characterized in that, It also includes testing the initial self-sealing force, and the method for testing the initial self-sealing force includes the following steps: Remove the third magnetic group (58) on the valve seat (54). After the magnetic self-trigger is completed, the linear drive mechanism (4) drives the central rod (53) to move down, so that the core cylinder (52) is pressed back onto the closed valve disc (55) to form an initial pre-tightening. Since the core cylinder (52) is connected to the central rod (53), the pressure sensor at the upper end of the central rod (53) can display the pressure. Then, the liquid is added to the inside of the core extractor (5) through the liquid supply system. The pump pressure is observed. If the pump pressure decreases slowly, it indicates that the initial sealing force is insufficient and needs to be adjusted again. The initial range of the initial pre-tightening force is determined by the least dichotomy method. Then, the above cycle is carried out once for each increase of 1N in the initial self-sealing force until the pressure holding controller achieves the initial seal.

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