Magnetic control multidirectional pressure-maintaining coring self-triggering self-sealing monitoring device and testing method

Abstract

The invention relates to a magnetic control multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device and a testing method. Comprising a base, an annular guide rail installed on the base, a coring fixing device installed on the annular guide rail, and a linear driving mechanism used for driving the coring fixing device to move in the annular direction so as to adjust the coring angle of the coring device and driving a center rod of the coring device to move in the axial direction. Liquid is conveyed into the coring device through the liquid supply system and continuously circulates, the environment in the coring device is modulated into a preset deep ground environment, and then the triggering effect and the self-sealing capacity of magnetic control self-triggering in different deep underground environments and different coring angles are tested by adjusting the pump pressure and liquid components in the liquid supply system. And the initial pre-tightening force required by the pressure maintaining controller in different liquid environments can be verified. The application effect of the magnetic control technical scheme in different environments can be monitored, and the application of the magnetic control technical scheme in engineering is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of pressure-maintaining coring, and in particular to a magnetically controlled multi-directional pressure-maintaining coring self-triggering and self-sealing monitoring device and a testing method. Background Art

[0002] The pressure-maintaining controller is the core component of the pressure-maintaining coring technology. During the deep-earth and deep-sea coring process, the pressure-maintaining controller often fails to trigger or the initial self-sealing fails due to the resistance of the contacting fluid environment (drilling fluid, seawater, etc.), which eventually leads to the failure of the entire pressure-maintaining controller.

[0003] To this end, our team has innovatively developed a magnetically controlled multi-directional pressure-maintaining coring technology, such as the Chinese patent document CN214576847U, which discloses a coring device that relies on magnetic triggering to maintain pressure. A second magnetic part is provided on the valve disc, and a first magnetic part that generates a repulsive force on the second magnetic part is installed on the outer cylinder at a position corresponding to the second magnetic part. A third magnetic part that generates an attractive force on the second magnetic part is provided on the valve seat. The self-triggering force of the pressure-maintaining controller is enhanced by magnetic force, so that it can not only overcome fluid resistance and its own gravity to achieve self-triggering, but also achieve self-sealing after triggering, thereby achieving pressure maintenance. However, in a complex fluid environment, due to changes in the flow rate of the drilling fluid and the influence of the high temperature and high pressure environment on it, it is impossible to monitor the application effect of the magnetic control technology solution in different environments, which affects its application in engineering. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a magnetically controlled multi-directional pressure-maintaining coring self-triggering and self-sealing monitoring device and a testing method.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present application provides a magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device, comprising a base, an annular guide rail installed on the base, a coring fixture installed on the annular guide rail and movable circumferentially along the annular guide rail, a circumferential drive mechanism for driving the coring fixture to move circumferentially and thereby adjust the coring angle of the coring device, and a linear drive mechanism for driving the center rod of the coring device to move axially, wherein the coring fixture is used to install and fix the coring device.

[0007] Optionally, the coring and fixing device includes a movable table, a support rod, a support platform and a clamping mechanism. The movable table is connected to the annular guide rail and can move in a circular motion along the annular guide rail under the action of the annular driving mechanism; the bottom of the support rod is connected to the movable table, and the top of the support rod is connected to the support platform. The clamping mechanism is installed on the support platform for clamping and fixing the coring device.

[0008] Optionally, a through hole adapted to the corer is provided on the support platform.

[0009] The corer includes an outer tube, a core tube, a pressure-maintaining controller and a center rod. The pressure-maintaining controller includes a valve seat and a valve flap. The valve seat is installed in the outer tube, and one side of the valve flap is connected to one end of the valve seat. A first magnetic component is provided on the valve flap, and a second magnetic component that generates a repulsive force on the first magnetic component is installed on the outer tube at a position corresponding to the first magnetic component.

[0010] The linear drive mechanism includes a vertical guide rail, a vertical slider slidingly matched with the vertical guide rail, and a drive device, and the drive device is connected to the vertical slider; a sensor integrated structure is provided at the upper end of the center rod, and the pressure sensor is integrated in the sensor integrated structure; the back of the sensor integrated structure is connected to the vertical slider, the front of the sensor integrated structure clamps the center rod, and the end of the center rod is in contact with the pressure sensor.

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

[0012] Optionally, a third magnetic component group is provided on the valve seat for generating suction force on the first magnetic component.

[0013] The present application provides a magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing testing method, which adopts a liquid supply system and the magnetically controlled multi-directional pressure-maintaining coring self-triggering 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 coring device is connected to the water tank through a liquid inlet pipeline, and the lower liquid outlet of the coring device is connected to the water tank through a liquid outlet pipeline.

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

[0015] The pressure-maintaining controller is turned on, the core barrel is located in the valve seat, and the coring device is adjusted to any angle through the annular drive mechanism;

[0016] Adjust the pump speed and start circulating the liquid environment through the liquid supply system. After a period of circulation, the central 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-maintaining controller has achieved self-triggering closure; otherwise, self-triggering has not been achieved.

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

[0018] Among them, the magnetically controlled self-sealing test method includes the following steps: based on the magnetically controlled self-triggering, observing the change of pump pressure, if the pump pressure continues to increase, it means that the initial self-sealing is achieved; otherwise, the initial self-sealing is not achieved.

[0019] Among them, the test of the initial self-sealing force includes the following steps: after the self-triggering is completed, the center rod is driven downward by the linear drive mechanism to make the core barrel press back on the closed valve disc to form the initial preload; because the core barrel is connected to the center rod, there is a pressure sensor at the top of the center rod to display the pressure; then the liquid is continued to be added to the corer through the liquid supply system, and the pump pressure is observed. If the pump pressure slowly decreases, it means that the initial sealing force is insufficient and can be adjusted again; the initial value range of the initial preload force is determined by the least dichotomy method, and then the above cycle is carried out every 1N to find the ideal initial preload force value, thereby inferring the size of the magnetic force required for magnetically controlled self-sealing and optimizing the magnetic control technology. Under the action of the ideal initial preload force, the pressure-maintaining controller can achieve initial sealing.

[0020] Preferably, a heating device is provided in the water tank.

[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 the magnetic control pressure maintaining controller in different deep reservoir in-situ environments including different corrosive liquids, different drilling fluid flow rates, different temperatures, and different pressure environments, and can test the initial self-sealing force. It can 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A three-dimensional diagram of a magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device in an embodiment;

[0025] Figure 2 It is a longitudinal cross-sectional view of a magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device in an embodiment;

[0026] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0027] Figure 4 A three-dimensional diagram of the coring fixture and the coring device in the embodiment;

[0028] Figure 5 is a cross-sectional view of the corer when the pressure-maintaining controller in the embodiment is turned on;

[0029] Figure 6 A schematic diagram of a coring device and a liquid supply system in an embodiment;

[0030] Figure 7 It is a cross-sectional view of the coring device after the pressure-maintaining controller is self-triggered and closed in the embodiment;

[0031] Figure 8 This is a cross-sectional view of the corer when the core barrel is back-pressed on the closed valve disc when verifying the initial self-sealing force in the embodiment. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figures 1 to 3As shown, the present embodiment discloses a magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device, comprising a base 1, an annular guide rail 2, a coring fixture 3, an annular drive mechanism, a linear drive mechanism 4 and a coring device 5, wherein the axis of the annular guide rail 2 is parallel to the horizontal plane.

[0037] Among them, Figure 5 As shown, the coring device 5 includes an outer cylinder 51, a core cylinder 52, a pressure-maintaining controller, and a center rod 53. The pressure-maintaining controller includes a valve seat 54 and a valve flap 55. The valve seat 54 is installed in the outer cylinder 51. A sealing ring is installed on the valve seat 54. One side of the valve flap 55 is connected to one end of the valve seat 54. A first magnetic member 56 is provided on the valve flap 55. A second magnetic member 57 that generates a repulsive force on the first magnetic member 56 is installed at a position corresponding to the first magnetic member 56 on the outer cylinder 51. A third magnetic member group 58 for generating an attractive force on the first magnetic member 56 is provided on the valve seat 54. In the initial state, the core cylinder 52 is located in the valve seat 54, and the valve flap 55 is confined between the core cylinder 52 and the outer cylinder 51.

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

[0039] It is worth noting that the third magnetic member group 58 can have different arrangements to generate different magnetic attraction forces, which is a conventional technique in the art and will not be described in detail here.

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

[0041] The coring fixture 3 is installed on the annular guide rail 2 and can move circumferentially along the annular guide rail 2 . The circumferential driving mechanism is connected to the coring fixture 3 to drive the coring fixture 3 to move circumferentially along the annular guide rail 2 .

[0042] The coring tool 5 and the linear drive mechanism 4 are installed on the coring fixture 3 , and the linear drive mechanism 4 is used to drive the central rod 53 of the coring tool 5 to move linearly.

[0043] The linear drive mechanism 4 includes a vertical guide rail, a vertical slider slidably matched 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 may be a linear motor, a cylinder or a hydraulic cylinder, etc. This is conventional technology in the art and will not be described in detail here.

[0045] In some embodiments, the circumferential drive mechanism includes a stepper motor 71 installed on the coring fixture 3 and a gear 72 connected to the output of the stepper motor. There is an annular rack 73 on the annular guide rail 2, and the gear 72 is meshed with the annular rack 73. The rotation of the stepper motor 71 drives the gear 72 to rotate. The gear 72 meshes with the annular rack 73 and moves, which can drive the coring device 5 to rotate in the vertical plane, thereby adjusting the coring angle.

[0046] In some embodiments, Figure 4 As shown, the coring fixture 3 includes a movable platform 31, a support rod 32, a support platform 33 and a clamping mechanism 34. The movable platform 31 is slidably connected to the annular guide rail 2 and can be circularly moved along the annular rack rail 73 under the action of the annular 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 installed on the support platform 33 for clamping and fixing the coring tool 5. There is a through hole on the support platform 33 that is adapted to the coring tool 5. The coring tool 5 is installed in the through hole and fixed by the clamping mechanism 34, so that it can rotate along the annular drive mechanism with the coring fixture 3 to achieve the adjustment of the coring angle. There is a linear guide on the support platform 33, and there is a linear slider on the linear guide. 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 through a rotating shaft. The axis of the rotating shaft is perpendicular to the axis of the annular guide rail 2. The support platform 33 can be rotated around the rotating shaft to adjust the coring angle. In combination with the annular guide rail 2 and the annular drive mechanism, the simulation of coring conditions at any angle can be achieved. Of course, the support platform 33 is equipped with a rotating drive motor 35, which is connected to the rotating shaft, and the supporting platform 33 can be driven to rotate around the rotating shaft through the rotating drive motor 35.

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

[0049] Experimental preparation: A fluid supply system is required to simulate the underground environment. Figure 6 As shown, the liquid supply system includes a water tank 6, a pump group, a control valve group and a matching pipeline system. Different liquids can be replaced in the water tank 6. Preferably, a heating device is provided in the water tank, and different reservoir environments can be simulated by heating. The upper liquid inlet of the corer 5 is connected to the water tank 6 through a liquid inlet pipeline, and the lower liquid outlet of the corer 5 is connected to the water tank 6 through a liquid outlet pipeline. By transporting the liquid to the inside of the corer 5 and circulating it continuously, the environment inside the corer 5 is modulated into a preset deep-earth environment, and then the following three experiments can be completed:

[0050] Experiment 1: Verify the magnetically controlled self-triggering and self-sealing function of the pressure-maintaining controller: By adjusting the pump pressure, test the triggering effect of the magnetically controlled self-triggering at different coring angles under different liquid flow rates. Specifically, the following steps are included:

[0051] First, if Figure 5 As shown, the pressure-maintaining controller is turned on, the core barrel 52 is located in the valve seat 54, and the coring device 5 is adjusted to any angle through the annular drive mechanism and the rotary drive motor 35;

[0052] Then, the liquid environment is circulated through the liquid supply system. After the internal pressure of the corer 5 is consistent with the preset environmental parameters, which should generally be greater than 2 hours, the magnetic control self-triggering effect is tested, and the center rod 53 is driven to be pulled 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 are achieved, because only when self-triggering and self-sealing are achieved, the pump pressure will increase significantly; otherwise, it means that the magnetic control technology has failed.

[0053] Self-triggering principle: Figure 7 As shown, when the core barrel 52 is lifted to a position higher than the valve flap 55 and the valve flap 55 loses the limit of the core barrel 52, the repulsive force of the second magnetic component 57 on the first magnetic component 56 causes the valve flap 55 to close and rotate; when the valve flap 55 rotates to a certain angle, the first magnetic component 56 is attracted by the third magnetic component group 58, causing the valve flap 55 to quickly close with the valve seat 54.

[0054] Experiment 3: Verify the initial self-sealing force: Since integrating a permanent magnet on the valve seat 54 will weaken its ultimate pressure resistance, when integrating a permanent magnet, it is often hoped that the size of the permanent magnet is as small as possible. However, the size of the permanent magnet determines the self-sealing performance of the pressure maintaining controller. Since the sealing performance of the valve seat sealing ring after heating may affect the size of the initial self-sealing force, it is necessary to verify how much initial pre-tightening force the pressure maintaining controller needs 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 center rod 53 is driven downward by the linear drive mechanism 4, so that the core barrel 52 is pressed back on the closed valve disc 54 to form an initial pre-tightening, such as Figure 8As shown; because the core barrel 52 is connected to the center rod 53, there is a sensor integrated structure 8 at the top of the center rod 53. The pressure sensor is integrated in the sensor integrated structure 8. The back of the sensor integrated structure 8 is connected to the vertical slider by threads, and the front is clamped by a clamp to clamp the center rod 53. The end of the center rod 53 contacts the pressure sensor, and the pressure sensor can display the pressure; the initial force of the pressure sensor is 0. When lifting, the pressure sensor will not be pressed; when pressing down, the pressure sensor contacts the end of the center rod 53, and the displayed value is the initial preload force. Then, the liquid is continued to be added to the corer 5 through the liquid supply system, and the pump pressure is observed. If the pump pressure decreases slowly, it means that the initial sealing force is insufficient. The center rod 53 can be driven downward again through the linear drive mechanism 4 to increase the pressure of the core barrel 52 on the valve disc 54; the initial value range of the initial preload force is determined by the minimum dichotomy method, and then the above cycle is carried out every 1N to find the ideal initial preload force value. Under the action of the ideal initial preload force, the pressure holding controller can achieve initial sealing. The ideal initial preload value can be used to infer the magnetic force required for magnetically controlled self-sealing, thereby optimizing the magnetically controlled technology.

[0055] The required initial self-sealing force is verified by the value of the pressure sensor on the center rod 53, and the magnetic field direction of the third magnetic component 58 is adjusted, and the safety factor is increased to make Finitial self-sealing force magnetic force = Fcenter rod*Qsafety factor

[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-maintaining controller under different liquids, different drilling fluid flow rates, different temperatures, and different pressure environments, and can test the initial self-sealing force. It can 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 only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device, characterized in that: include: Base (1); An annular guide rail (2) mounted on the base (1); A coring fixture (3) installed on the annular guide rail (2) and capable of circumferentially moving along the annular guide rail (2), the coring fixture (3) being used to install and fix a coring device (5); A circumferential driving mechanism for driving the coring fixture (3) to perform circumferential movement and thereby adjusting the coring angle of the coring device (5); A linear drive mechanism (4) is used for driving a center rod (53) of a corer (5) to move axially.

2. A magnetically controlled multi-directional pressure-maintaining coring self-triggering and self-sealing monitoring device according to claim 1, characterized in that: The coring fixing device (3) comprises a movable table (31), a support rod (32), a support platform (33) and a clamping mechanism (34); the movable table (31) is connected to the annular guide rail (2) and can be moved in an annular manner along the annular guide rail (2) under the action of the annular driving mechanism; The bottom of the support rod (32) is connected to the movable platform (31), the top of the support rod (32) is connected to the support platform (33), and the clamping mechanism (34) is installed on the support platform (33) for clamping and fixing the corer (5).

3. A magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device according to claim 2, characterized in that: A through hole adapted to the corer (5) is provided on the supporting platform (33).

4. The magnetically controlled multi-directional pressure-maintaining coring self-triggering and self-sealing monitoring device according to claim 2 is 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) via 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 (5) 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-maintaining coring self-triggering and self-sealing monitoring device according to any one of claims 1 to 4, characterized in that: The corer (5) also includes an outer tube (51), a core tube (52), a magnetic control pressure-maintaining controller and a center rod (53); the magnetic control pressure-maintaining controller includes a valve seat (54) and a valve flap (55); the valve seat (54) is installed in the outer tube (51); one side of the valve flap (55) is connected to one end of the valve seat (54); a first magnetic component (56) is provided on the valve flap (55); a second magnetic component (57) for generating a repulsive force on the first magnetic component (56) is installed at a position on the outer tube (51) corresponding to the first magnetic component (56); The linear drive mechanism (4) comprises a vertical guide rail, a vertical slider slidably matched with the vertical guide rail, and a drive device, wherein the drive device is connected to the vertical slider; A sensor integrated structure (8) is provided at the upper end of the central rod (53), and the pressure sensor is integrated in the sensor integrated structure (8); the back of the sensor integrated structure (8) is connected to the vertical slider, the front of the sensor integrated structure (8) clamps the central rod (53), and the end of the central rod (53) contacts the pressure sensor.

6. A magnetically controlled multi-directional pressure-maintaining 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-maintaining coring self-triggering and self-sealing monitoring device according to claim 5 is characterized in that: The valve seat (54) is provided with a third magnetic component group (58) for generating a suction force on the first magnetic component (56).

8. A magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing test method, characterized in that: A magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing monitoring device and a liquid supply system as described in any one of claims 1 to 7 are used, wherein the liquid supply system comprises a water tank (6), a pump group, a control valve group and a matching pipeline system, and a heating device may or may not be provided in the water tank (6); the upper liquid inlet of the coring device (5) is connected to the water tank (6) through a liquid inlet pipeline, and the lower liquid outlet of the coring device (5) is connected to the water tank (6) through a liquid outlet pipeline; The magnetic control self-triggering test method includes the following steps: The pressure-maintaining controller is turned on, the core barrel (52) is located in the valve seat (54), and the coring device (5) is adjusted to a certain angle through the annular driving mechanism to simulate the coring condition; The pump pressure is adjusted, and the liquid environment is circulated through the liquid supply system until the pressure inside the corer is consistent with the preset environmental parameters, and the central rod (53) is driven to rise 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 the pressure-maintaining controller has achieved self-triggering and self-sealing; otherwise, it means that the magnetic control closure has failed; Then, the pump pressure and the liquid composition in the water tank (6) are changed, and the above steps are repeated to test the magnetic control self-triggering effect at different coring angles under different flow rates and different liquid composition environments.

9. A magnetically controlled multi-directional pressure-maintaining coring self-triggering and self-sealing monitoring device according to claim 8, characterized in that: The magnetically controlled self-sealing test method includes the following steps: based on the magnetically controlled self-triggering, observing the pump pressure change, if the pump pressure continues to increase, it means that self-triggering and initial self-sealing are achieved; otherwise, the initial self-sealing is not achieved.

10. A magnetically controlled multi-directional pressure-maintaining coring self-triggering self-sealing testing method according to claim 8 or 9, characterized in that: It also includes testing the initial self-sealing force, and the initial self-sealing force method includes the following steps: The third magnetic group (58) on the valve seat (54) is removed. After the magnetic control self-triggering is completed, the central rod (53) is driven downward by the linear drive mechanism (4), so that the core barrel (52) is pressed back on the closed valve disc (54) to form an initial pre-tightening. Since the core barrel (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, liquid is continuously added to the corer (5) through the liquid supply system, and 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 value range of the initial preload force is determined by the least dichotomy method, and then the above cycle is carried out once for each increase of 1N in the initial self-sealing force until the pressure-maintaining controller achieves initial sealing.

Images