A method of using a coring transfer device suitable for use with a subsea in situ testing system

Abstract

The application discloses a kind of suitable for the use method of coring transfer device of seabed in-situ testing system, belong to sampling equipment technical field, suitable for the coring transfer device of seabed in-situ testing system include casing, coring mechanism and transfer mechanism;Wherein, coring mechanism is located in casing and is connected with transfer mechanism, coring mechanism is configured to drive transfer mechanism to make linear reciprocating movement;Transfer mechanism includes first shell, first linear drive assembly, coring barrel and piston plate, one end of first shell is connected with coring mechanism, coring barrel is connected with the other end of first shell and is open to the direction of back to first shell, coring barrel is configured to be able to enter and exit casing, piston plate is slidably arranged in coring barrel, one end of first linear drive assembly is connected with first shell, the other end is connected with piston plate, to drive piston plate reciprocating sliding in coring barrel, realize the coring and transfer of core sample, core sample is transferred to the test cabin of seabed in-situ testing system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sampling equipment, in particular to a use method of a coring transfer device suitable for a seabed in-situ test system. BACKGROUND

[0002] Seabed natural gas hydrate is a new type of seabed resource, and the seabed reserves are very huge. The global seabed natural gas hydrate reserves are about twice the existing natural gas and oil reserves, and have broad development prospects. For countries with tight oil resources, exploring and developing seabed natural gas hydrate resources as alternative energy has become a major strategic decision.

[0003] At present, seabed drilling machine technology has significantly improved drilling efficiency and reduced cost by realizing large-depth butt joint of drill pipes and pressure core sampling, and has become a key technical support for reducing cost and increasing efficiency in natural gas hydrate exploration and development. The hydrate core in-situ triaxial mechanical property test system based on the seabed drilling machine can realize low disturbance transfer and stress state simulation of the hydrate core at the seabed, so as to obtain the stress-strain relationship of the core sample under in-situ conditions, and understand the mechanical response and failure mechanism of the hydrate in the mining process, thereby providing technical support for the stability study of the mechanical strength of hydrate sediments, the safety evaluation of hydrate development environment, and the environmental evaluation.

[0004] In related technologies, the current sampling equipment cannot realize the transfer of the hydrate core to the test cabin of the hydrate core in-situ triaxial mechanical property test system integrated with the seabed drilling machine, which limits the detection efficiency and data accuracy of hydrate exploration, and restricts the improvement of comprehensive analysis capability of hydrate. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a use method of a coring transfer device suitable for a seabed in-situ test system, which can realize coring and transfer of core samples, so as to transfer the core samples to the test cabin of the seabed in-situ test system, thereby improving the detection efficiency and data accuracy, and improving the comprehensive analysis capability of hydrate.

[0006] The use method of the coring transfer device suitable for the seabed in-situ test system according to the first aspect of the present application, the coring transfer device suitable for the seabed in-situ test system comprises: a casing, a coring mechanism and a transfer mechanism;

[0007] The core-taking mechanism is located inside the housing and connected to the transfer mechanism. The core-taking mechanism is configured to drive the transfer mechanism to move linearly back and forth. The transfer mechanism includes a first housing, a first linear drive assembly, a core-taking cylinder, and a piston plate. One end of the first housing is connected to the core-taking mechanism, and the core-taking cylinder is connected to the other end of the first housing and is open in the direction away from the first housing. The core-taking cylinder is configured to be able to enter and exit the housing. The piston plate is slidably disposed inside the core-taking cylinder. One end of the first linear drive assembly is connected to the first housing, and the other end is connected to the piston plate to drive the piston plate to slide back and forth inside the core-taking cylinder.

[0008] The usage methods of the coring transfer device suitable for seabed in-situ testing systems include:

[0009] After drilling, a coring and transfer device suitable for the seabed in-situ testing system is placed in the drill string and connected to the drill string.

[0010] The control mechanism drives the transfer mechanism to move along the first direction, so as to drive the core tube to extend out of the casing and penetrate into the formation, and controls the first linear drive assembly to drive the piston plate to move in the opposite direction to the core tube along the first direction, so as to generate negative pressure at the opening of the core tube and allow the core sample to enter the core tube.

[0011] Control the operation of the core-collecting mechanism to drive the core-collecting cylinder and piston plate to move together in the opposite direction of the first direction into the machine housing;

[0012] Move the coring transfer device suitable for the seabed in-situ testing system so that the coring transfer device suitable for the seabed in-situ testing system is aligned with the test chamber of the seabed in-situ testing system.

[0013] The operation of the first linear drive assembly is controlled to cause the piston plate to be displaced relative to the core tube in the first direction, so as to push the core sample out of the core tube and into the test chamber.

[0014] The method of using the coring transfer device for an in-situ seabed testing system according to an embodiment of the present invention has at least the following beneficial effects: In the initial state, both the coring cylinder and the piston plate are located inside the housing, with the piston plate located at the end of the coring cylinder furthest from the first housing. When sampling is required, the coring mechanism operates and drives the transfer mechanism to extend linearly, so that the coring cylinder extends out of the housing and penetrates into the formation. In conjunction with the operation of the first linear drive assembly, the coring cylinder is displaced relative to the piston plate in a direction away from the first housing, generating negative pressure at the opening of the coring cylinder, allowing the core sample to enter the coring cylinder and preventing the core sample from falling out. Then, the coring mechanism operates to drive the coring... The cylinder and piston plate move synchronously into the housing to improve the stability of core sample transfer within the cylinder. Then, the core transfer device suitable for the seabed in-situ testing system can be transferred and aligned with the test chamber of the system. The first linear drive assembly then operates, displacing the piston plate relative to the cylinder away from the first housing, thus pushing the core sample through the cylinder and into the test chamber. In other words, this core transfer device for the seabed in-situ testing system can achieve core sample collection and transfer, thereby transferring the core sample to the test chamber of the seabed in-situ testing system, improving detection efficiency and data accuracy, and enhancing the comprehensive analysis capabilities of hydrates.

[0015] According to some embodiments of the present invention, the first linear drive assembly includes a first lead screw motor, a first lead screw, and a first slider. A first cavity is provided inside the first housing. One end of the first lead screw passes through the core-taking cylinder and is connected to the piston plate. The other end of the first lead screw passes through the first cavity. The first lead screw motor is located in the first cavity and is drivenly connected to the first lead screw to drive the first lead screw in and out of the first cavity, thereby causing the piston plate to be displaced relative to the core-taking cylinder. The first slider is slidably connected to the first housing and connected to the first lead screw.

[0016] According to some embodiments of the present invention, the first linear drive assembly further includes a plurality of first guide rods that are parallel to each other, the first guide rods being disposed in the first cavity and connected to the first housing, and the plurality of first guide rods being slidably connected to the first slider.

[0017] According to some embodiments of the present invention, the transfer mechanism further includes a first sliding sleeve, which is connected to one end of the first housing near the core tube, and a first lead screw passes through the first sliding sleeve and is slidably connected to the first sliding sleeve.

[0018] According to some embodiments of the present invention, the core-taking mechanism includes a second housing, a second lead screw motor, a second lead screw, and a second slider. The second housing has a second cavity. One end of the second lead screw is connected to the first housing, and the other end passes through the second cavity. The second lead screw motor is located in the second cavity and is drivenly connected to the second lead screw to drive the second lead screw in and out of the second cavity. The second slider is slidably connected to the second housing and connected to the second lead screw.

[0019] According to some embodiments of the present invention, the core-taking mechanism further includes a plurality of parallel second guide rods, which are disposed in the second cavity and connected to the second housing, and the plurality of second guide rods are slidably connected to the second slider.

[0020] According to some embodiments of the present invention, the core-taking mechanism further includes a second sliding sleeve, which is connected to one end of the second housing near the transfer mechanism, and a second lead screw passes through the second sliding sleeve and is slidably connected to the second sliding sleeve.

[0021] According to some embodiments of the present invention, the housing has a core-taking channel, the outer peripheral surfaces of the first housing and the second housing are adapted to the inner peripheral surface of the core-taking channel, and the first housing is capable of sliding along the core-taking channel.

[0022] According to some embodiments of the present invention, and controlling the first linear drive assembly to drive the piston plate to generate a reverse displacement relative to the core barrel along a first direction, includes:

[0023] Control the operation of the first linear drive assembly to move the piston plate from the end of the core-retrieving cylinder away from the core-retrieving mechanism to the end closer to the core-retrieving mechanism; and / or,

[0024] Controlling the operation of the first linear drive assembly to cause the piston plate to displace relative to the core-taking cylinder along a first direction includes:

[0025] Control the operation of the first linear drive assembly to drive the piston plate from the end of the core-retrieving cylinder near the core-retrieving mechanism to the end away from the core-retrieving mechanism.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 This is a schematic diagram of the structure of a coring and transfer device for an in-situ seabed testing system according to an embodiment of the present invention in its initial state;

[0029] Figure 2 This is a schematic diagram of the structure of a coring transfer device for a seabed in-situ testing system according to an embodiment of the present invention, in which the coring cylinder extends out of the housing and the piston plate moves to the end of the coring cylinder near the coring mechanism.

[0030] Figure 3 This is a schematic diagram of the structure of a core transfer device for a seabed in-situ testing system according to an embodiment of the present invention, in which both the core cylinder and the piston plate are inserted into the housing;

[0031] Figure 4This is a schematic diagram of the structure of a core transfer device for a seabed in-situ testing system according to an embodiment of the present invention, showing the piston plate moving relative to the core cylinder to the end away from the core collection mechanism.

[0032] Figure 5 This is a flowchart illustrating the usage method of a coring and transfer device suitable for an in-situ seabed testing system according to an embodiment of the present invention.

[0033] Figure 6 This is a flowchart illustrating the control process for the displacement of the piston plate relative to the core cylinder in a core transfer device for an in-situ seabed testing system, according to an embodiment of the present invention.

[0034] Icon labels:

[0035] 100. Core-taking mechanism; 110. Second housing; 120. Second lead screw motor; 130. Second lead screw; 140. Second slider; 150. Second guide rod; 160. Second sliding sleeve;

[0036] 200. Transfer mechanism; 210. First housing; 220. First linear drive assembly; 221. First lead screw motor; 222. First lead screw; 223. First slider; 224. First guide rod; 225. First sliding sleeve; 230. Core tube; 240. Piston plate;

[0037] 300. Housing; 310. Core extraction channel. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying 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, and therefore should not be construed as a limitation of this invention.

[0040] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0041] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0042] Reference Figures 1 to 4 As shown, a coring and transfer device for an in-situ seabed testing system according to an embodiment of the present invention includes: a housing 300, a coring mechanism 100, and a transfer mechanism 200.

[0043] Reference Figure 1 , Figure 2 and Figure 3 As shown, the core sampling mechanism 100 is disposed within and connected to the housing 300, which provides support for the core sampling mechanism 100. The housing 300 has a sampling end. The core sampling mechanism 100 is connected to the transfer mechanism 200, and is configured to drive the transfer mechanism 200 to perform linear reciprocating movement, thereby driving the end of the transfer mechanism 200 to enter and exit the sampling end of the housing 300.

[0044] Reference Figure 1 , Figure 2 and Figure 3 As shown, the transfer mechanism 200 includes a first housing 210, a first linear drive assembly 220, a core-taking cylinder 230, and a piston plate 240. One end of the first housing 210 is connected to the core-taking mechanism 100. The core-taking cylinder 230 is connected to the other end of the first housing 210 and is open in the direction away from the first housing 210. The core-taking cylinder 230 is configured to be able to enter and exit the housing 300. The piston plate 240 is slidably disposed inside the core-taking cylinder 230. One end of the first linear drive assembly 220 is connected to the first housing 210, and the other end is connected to the piston plate 240 to drive the piston plate 240 to reciprocate within the core-taking cylinder 230.

[0045] Reference Figure 1 As shown, in the initial state, the core-taking cylinder 230 and piston plate 240 of the transfer mechanism 200 are both located inside the housing 300, and the piston plate 240 is located at the end of the core-taking cylinder 230 away from the core-taking mechanism 100, so as to close the opening of the core-taking cylinder 230.

[0046] Reference Figure 2As shown, when the coring transfer device for the seabed in-situ testing system needs to take samples, the coring mechanism 100 can operate and drive the transfer mechanism 200 to extend linearly, so that the coring cylinder 230 extends out of the housing 300 and penetrates into the formation. The first linear drive component 220 operates, driving the piston plate 240 to move relative to the coring cylinder 230 towards the first housing 210, so that the opening of the coring cylinder 230 opens and a negative pressure is generated at the opening of the coring cylinder 230, so that the core sample enters the coring cylinder 230, thereby improving the coring rate and preventing the core sample from falling out.

[0047] Reference Figure 3 As shown, after sampling, the core transfer device suitable for the seabed in-situ testing system can control the operation of the core mechanism 100 to drive the core cylinder 230 and piston plate 240 to move synchronously into the housing 300, so as to improve the stability of the core sample transfer in the core cylinder 230.

[0048] Reference Figure 4 As shown, the core transfer device suitable for the seabed in-situ testing system is then transferred and aligned with the test chamber of the seabed in-situ testing system. Then, the first linear drive assembly 220 operates, causing the piston plate 240 to displace relative to the core tube 230 in a direction away from the first housing 210, so as to push the core sample out of the core tube 230 and into the test chamber.

[0049] Reference Figure 1 , Figure 2 and Figure 3 As shown, the core transfer device suitable for the seabed in-situ testing system can collect and transfer core samples, thereby transferring the core samples to the test chamber of the seabed in-situ testing system to improve detection efficiency and data accuracy, and enhance the comprehensive analysis capability of hydrates.

[0050] Reference Figure 1 , Figure 2 and Figure 3 As shown, it can be understood that the first linear drive assembly 220 includes a first lead screw motor 221, a first lead screw 222 and a first slider 223. The first housing 210 is provided with a first cavity, the first cavity has a first outlet, one end of the first lead screw 222 passes through the core tube 230 and is connected to the piston plate 240, and the other end of the first lead screw 222 passes through the first cavity, that is, the first lead screw 222 passes through the first outlet.

[0051] Reference Figure 1 , Figure 2 and Figure 4As shown, the first lead screw motor 221 is located in the first cavity and connected to the first housing 210. The first slider 223 is slidably connected to the first housing 210 and connected to the first lead screw 222 to restrict the rotation of the first lead screw 222. The first lead screw motor 221 is located in the first cavity and is connected to the first lead screw 222 for transmission, so that the first lead screw 222 moves linearly back and forth along the axial direction of the first outlet to drive the piston plate 240 to move linearly back and forth along the core-taking cylinder 230, and the piston plate 240 and the core-taking cylinder 230 generate relative displacement.

[0052] Reference Figure 1 , Figure 2 and Figure 3 As shown, it can be understood that the first linear drive assembly 220 also includes a plurality of parallel first guide rods 224. The first guide rods 224 are disposed within the first cavity and connected to the first housing 210, and the plurality of first guide rods 224 are slidably connected to the first slider 223. Taking the two ends of the housing 300 arranged in the vertical direction as an example, the length direction of the first guide rods 224 is arranged in the vertical direction.

[0053] Reference Figure 1 , Figure 2 and Figure 3 As shown, the first guide rod 224 is disposed in the first cavity. The first slider 223 abuts against the first guide rod 224 to restrict the rotation of the first slider 223. The end of the first lead screw 222 is fixedly connected to the first slider 223 to restrict the rotation of the first lead screw 222. With the cooperation of the first lead screw motor 221 driving the first lead screw 222, the first lead screw 222 is driven to move linearly in the up and down direction, which can improve the movement stability of the first lead screw 222.

[0054] Reference Figure 2 , Figure 3 and Figure 4 As shown, specifically, the first lead screw motor 221 includes a first rotary driver and a first nut. The first nut is threadedly connected to the first lead screw 222. The first rotary driver is used to drive the first nut to rotate. Through the relative rotation of the first nut and the first lead screw 222, the first lead screw 222 is driven to move up and down.

[0055] Reference Figure 1 , Figure 2 and Figure 3As shown, it can be understood that the transfer mechanism 200 also includes a first sliding sleeve 225, which is connected to one end of the first housing 210 near the core tube 230. The first lead screw 222 passes through the first sliding sleeve 225 and is slidably connected to the first sliding sleeve 225. By the mutual abutment between the outer peripheral surface of the first lead screw 222 and the inner peripheral surface of the first sliding sleeve 225, the straightness of the movement of the first lead screw 222 is improved, and the radial deformation of the first lead screw 222 is reduced, so as to achieve stable support for the first lead screw 222.

[0056] Reference Figure 1 , Figure 2 and Figure 3 As shown, it can be understood that the core extraction mechanism 100 includes a second housing 110, a second lead screw motor 120, a second lead screw 130, and a second slider 140. The second housing 110 is provided with a second cavity. One end of the second lead screw 130 is connected to the first housing 210, and the other end passes through the second cavity. The second cavity has a second opening, and the other end of the second lead screw 130 passes through the second outlet.

[0057] Reference Figure 1 , Figure 2 and Figure 3 As shown, the second lead screw motor 120 is located in the second cavity and connected to the second housing 110. The second slider 140 is slidably connected to the second housing 110 and connected to the second lead screw 130 to restrict the rotation of the second lead screw 130. The second lead screw motor 120 is located in the second cavity and is connected to the second lead screw 130 for transmission, so that the second lead screw 130 moves linearly reciprocally along the axial direction of the second outlet, causing the first housing 210 to be displaced along the housing 300, thereby driving the transfer mechanism 200 to move linearly reciprocally along the housing.

[0058] Reference Figure 2 , Figure 3 and Figure 4 As shown, it can be understood that the core-taking mechanism 100 also includes a plurality of parallel second guide rods 150. The second guide rods 150 are disposed in the second cavity and connected to the second housing 110. The plurality of second guide rods 150 are slidably connected to the second slider 140. Taking the two ends of the housing 300 as being in the vertical direction, the length direction of the second guide rods 150 is set along the vertical direction.

[0059] Reference Figure 1 , Figure 2 and Figure 3As shown, the second guide rod 150 is disposed in the second cavity. The second slider 140 abuts against the second guide rod 150 to restrict the rotation of the second slider 140. The end of the second lead screw 130 is fixedly connected to the second slider 140 to restrict the rotation of the second lead screw 130. In conjunction with the second lead screw motor 120 driving the second lead screw 130, the second lead screw 130 is driven to move linearly in the up and down direction, which can improve the movement stability of the second lead screw 130.

[0060] Reference Figure 1 , Figure 2 and Figure 3 As shown, specifically, the second lead screw motor 120 includes a second rotary driver and a second nut. The second nut is threadedly connected to the second lead screw 130. The second rotary driver is used to drive the second nut to rotate. Through the relative rotation of the second nut and the second lead screw 130, the second lead screw 130 is driven to move up and down.

[0061] Reference Figure 1 , Figure 2 and Figure 3 As shown, it can be understood that the core-taking mechanism 100 also includes a second sliding sleeve 160. The second sliding sleeve 160 is connected to one end of the second housing 110 near the transfer mechanism 200. The second lead screw 130 passes through the second sliding sleeve 160 and is slidably connected to the second sliding sleeve 160. By the mutual abutment between the outer peripheral surface of the second lead screw 130 and the inner peripheral surface of the second sliding sleeve 160, the straightness of the movement of the second lead screw 130 is improved, and the radial deformation of the second lead screw 130 is reduced, so as to achieve stable support for the second lead screw 130.

[0062] Reference Figure 1 , Figure 2 and Figure 3 As shown, it can be understood that the housing 300 has a core extraction channel 310, the outer peripheral surfaces of the first housing 210 and the second housing 110 are in contact with the inner peripheral surfaces of the core extraction channel 310, and the first housing 210 is configured to slide along the core extraction channel 310.

[0063] Reference Figure 2 , Figure 3 and Figure 4 As shown, the second housing 110 can be fixedly connected to the housing 300, and in conjunction with the connection of the second lead screw motor 120 and the second lead screw 130, it drives the first housing 210 to slide along the core extraction channel 310. The outer peripheral surface of the first housing 210 is adapted to the cross-section of the core extraction channel 310. The mutual abutment between the first housing 210 and the core extraction channel 310 improves the stability of the first housing 210 moving along the core extraction channel 310.

[0064] Reference Figure 1 , Figure 2 and Figure 3As shown, it can be understood that the first lead screw 222 and the second lead screw 130 are each provided with two annular sealing grooves in the middle, and annular sealing rings are provided in the annular sealing grooves so that the first lead screw 222 and the second lead screw 130 remain sealed during movement, which helps to prevent external liquid from entering the first cavity and the second cavity.

[0065] Reference Figure 5 and Figure 6 As shown, it is understood that the coring transfer device suitable for the seabed in-situ testing system also includes a connecting cylinder, which is arranged vertically through the system. The two ends of the connecting cylinder are connected to the coring cylinder 230 and the first housing 210 respectively, so that the coring cylinder 230 can be located at the sampling end of the housing 300 in the initial state, and the inner cavity of the coring cylinder 230 can be used to accommodate the first sliding sleeve 225.

[0066] Reference Figure 5 As shown, a method for using a coring and transfer device suitable for a seabed in-situ testing system according to an embodiment of the present invention is applied to the coring and transfer device suitable for a seabed in-situ testing system in any of the above embodiments; the method for using the coring and transfer device suitable for a seabed in-situ testing system includes:

[0067] Step S100: After drilling, place the core transfer device suitable for the seabed in-situ testing system into the drill string and connect it to the drill string.

[0068] In step S200, the core sampling mechanism 100 is controlled to drive the transfer mechanism 200 to move along the first direction, so as to drive the core sampling cylinder 230 to extend out of the housing 300 and penetrate into the formation. The first linear drive assembly 220 is controlled to drive the piston plate 240 to move in the opposite direction to the core sampling cylinder 230 along the first direction, so as to generate negative pressure at the opening of the core sampling cylinder 230, so that the core sample enters the core sampling cylinder 230.

[0069] Step S300: Control the operation of the core extraction mechanism 100 to drive the core extraction cylinder 230 and the piston plate 240 to move together in the opposite direction of the first direction into the housing 300.

[0070] Step S400: Move the coring transfer device suitable for the seabed in-situ testing system so that the coring transfer device suitable for the seabed in-situ testing system is aligned with the test chamber of the seabed in-situ testing system.

[0071] In step S500, the first linear drive assembly 220 is controlled to operate, causing the piston plate 240 to be displaced relative to the core tube 230 in the first direction, so as to push the core sample out of the core tube 230 and into the test chamber.

[0072] Reference Figure 1 and Figure 5As shown, in step S100, the subsea drilling rig drills a hole to prepare for coring. A drill string is installed in the hole, and the drill string has a hollow channel leading to the stratum. Then, the coring transfer device suitable for the subsea in-situ testing system can be used by an underwater winch to place the coring transfer device suitable for the subsea in-situ testing system into the drill string in the hole through an armored cable, so that the coring transfer device suitable for the subsea in-situ testing system can be slowly moved down along the hollow channel.

[0073] Reference Figure 1 and Figure 5 As shown, the annular seat at the top of the coring transfer device for the in-situ seabed testing system aligns with the suspension seat on the drill string. Then, the coring transfer device for the in-situ seabed testing system can be used to eject the chuck on the coring transfer device to the chuck chamber on the drill string, thereby achieving the positioning and connection between the coring transfer device for the in-situ seabed testing system and the drill string, and restricting the rotation of the coring transfer device for the in-situ seabed testing system.

[0074] Reference Figure 2 and Figure 5 As shown, in step S200, the coring transfer device suitable for the seabed in-situ testing system can be powered by an armored cable. By controlling the operation of the coring mechanism 100, the transfer mechanism 200 can be driven to move downward, so that the coring cylinder 230 extends downward out of the housing 300 and penetrates into the formation. The first linear drive component 220 is controlled to drive the piston plate 240 to move in the opposite direction to the coring cylinder 230 in the first direction, so that a negative pressure is generated at the lower end of the coring cylinder 230, so that the core sample can enter the coring cylinder 230 and keep the core sample inside the coring cylinder 230, reducing the risk of the core sample falling out.

[0075] Reference Figure 3 and Figure 5 As shown, in step S300, after the core is taken, the core transfer device suitable for the seabed in-situ testing system can control the operation of the core taking mechanism 100 to drive the core taking cylinder 230 and the piston plate 240 to move together in the opposite direction of the first direction and enter the housing 300, so that the core taking cylinder 230 carries the rock core sample to the inside of the housing 300.

[0076] Reference Figure 3 and Figure 5As shown, in step S400, the method of using the coring transfer device suitable for the seabed in-situ testing system is to move the coring transfer device suitable for the seabed in-situ testing system by driving the underwater winch device, and move the coring transfer device suitable for the seabed in-situ testing system onto the seabed drilling rig, so that the coring cylinder 230 is aligned with the test chamber of the seabed in-situ testing system.

[0077] Reference Figure 4 and Figure 5 As shown, in step S500, the method of using the core transfer device suitable for the seabed in-situ testing system can drive the first linear drive component 220 to operate, so that the piston plate 240 is displaced relative to the core tube 230 in a direction away from the core mechanism 100, so as to push the core sample out of the core tube 230 and into the test chamber, maintaining the original, undisturbed true state of the sample, so as to obtain the stress-strain relationship under in-situ conditions, thereby improving the detection efficiency and data accuracy, and enhancing the comprehensive analysis capability of hydrates.

[0078] It should be noted that, in the appendix Figure 1 , Figure 2 , Figure 3 and Figure 4 In the middle, the X direction is the first direction or the downward direction.

[0079] Reference Figure 4 and Figure 6 Understandably, in the method of using the coring transfer device applicable to the seabed in-situ testing system, in step S200, controlling the first linear drive assembly 220 to drive the piston plate 240 to generate a displacement relative to the coring cylinder 230 in the opposite direction in the first direction includes the following steps:

[0080] Step S210: Control the first linear drive assembly 220 to operate, driving the piston plate 240 to move from the end of the core-taking cylinder 230 away from the core-taking mechanism 100 to the end closer to the core-taking mechanism 100.

[0081] In step S500, controlling the first linear drive assembly 220 to operate, causing the piston plate 240 to be displaced relative to the core-taking cylinder 230 along a first direction, includes the following steps:

[0082] In step S510, the first linear drive assembly 220 is controlled to operate, driving the piston plate 240 to move from the end of the core-taking cylinder 230 close to the core-taking mechanism 100 to the end away from the core-taking mechanism 100.

[0083] In step S210, initially, the piston plate 240 is located at the end of the core cylinder 230 away from the core-taking mechanism 100 to close the opening of the core cylinder 230. During the core-taking process, the core-taking mechanism 100 operates, driving the core cylinder 230 to move away from the core-taking mechanism 100. The method of using this core-taking transfer device for the seabed in-situ testing system involves controlling the operation of the first linear drive assembly 220 to drive the piston plate 240 from the end of the core cylinder 230 away from the core-taking mechanism 100 to the end closer to the core-taking mechanism 100, thereby opening the opening of the core cylinder 230. The movement of the piston plate 240 relative to the core cylinder 230 creates a negative pressure at the opening of the core cylinder 230, thus enabling the sampling of the core sample.

[0084] In step S510, the control method can push the core sample out of the core tube 230 and into the test chamber, maintaining the original, undisturbed true state of the sample to obtain the stress-strain relationship under in-situ conditions, thereby improving detection efficiency and data accuracy and enhancing the comprehensive analysis capability of hydrates.

[0085] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for using a coring and transfer device suitable for in-situ seabed testing systems, characterized in that, The coring and transfer device suitable for the seabed in-situ testing system includes: a housing (300), a coring mechanism (100), and a transfer mechanism (200); The core-taking mechanism (100) is located inside the housing (300) and connected to the transfer mechanism (200). The core-taking mechanism (100) is configured to drive the transfer mechanism (200) to move linearly back and forth. The transfer mechanism (200) includes a first housing (210), a first linear drive assembly (220), a core-taking cylinder (230), and a piston plate (240). One end of the first housing (210) is connected to the core-taking mechanism (100). The core-taking cylinder (230) is connected to the other end of the first housing (210) and is open in a direction away from the first housing (210). The core-taking cylinder (230) is configured to be able to enter and exit the housing (300). The piston plate (240) is slidably disposed in the core-taking cylinder (230). One end of the first linear drive assembly (220) is connected to the first housing (210), and the other end is connected to the piston plate (240) to drive the piston plate (240) to reciprocate within the core-taking cylinder (230). The first linear drive assembly (220) includes a first lead screw motor (221), a first lead screw (222), and a first slider (223). The first housing (210) has a first cavity. One end of the first lead screw (222) passes through the core-taking cylinder (230) and is connected to the piston plate (240). The other end of the first lead screw (222) passes through the first cavity. The first lead screw motor (221) is located in the first cavity and is connected to the first lead screw (222) for transmission, so as to drive the first lead screw (222) to enter and exit the first cavity, so as to cause the piston plate (240) to move relative to the core-taking cylinder (230). The first slider (223) is slidably connected to the first housing (210) and connected to the first lead screw (222). The core extraction mechanism (100) includes a second housing (110), a second lead screw motor (120), a second lead screw (130), and a second slider (140). The second housing (110) has a second cavity. One end of the second lead screw (130) is connected to the first housing (210), and the other end passes through the second cavity. The second lead screw motor (120) is located in the second cavity and is connected to the second lead screw (130) for driving the second lead screw (130) in and out of the second cavity. The second slider (140) is slidably connected to the second housing (110) and connected to the second lead screw (130). The method of using the coring and transfer device suitable for seabed in-situ testing systems includes: After drilling, the coring and transfer device suitable for the seabed in-situ testing system is placed in the drill string and connected to the drill string. The core sampling mechanism (100) is controlled to drive the transfer mechanism (200) to move along a first direction, so as to drive the core tube (230) to extend out of the housing (300) and penetrate into the formation, and the first linear drive assembly (220) is controlled to drive the piston plate (240) to move relative to the core tube (230) in the opposite direction of the first direction, so as to generate negative pressure at the opening of the core tube (230) and allow the core sample to enter the core tube (230); Control the operation of the core-taking mechanism (100) to drive the core-taking cylinder (230) and the piston plate (240) to move together in the opposite direction of the first direction into the housing (300); Move the coring transfer device suitable for the seabed in-situ testing system so that the coring transfer device suitable for the seabed in-situ testing system is aligned with the test chamber of the seabed in-situ testing system. The first linear drive assembly (220) is controlled to operate, causing the piston plate (240) to be displaced relative to the core tube (230) along the first direction, so as to push the core sample out of the core tube (230) and into the test chamber.

2. The method of using the coring and transfer device for in-situ seabed testing systems according to claim 1, characterized in that, The first linear drive assembly (220) further includes a plurality of parallel first guide rods (224), which are disposed in the first cavity and connected to the first housing (210). The plurality of first guide rods (224) are slidably connected to the first slider (223).

3. The method of using the coring and transfer device for in-situ seabed testing systems according to claim 1, characterized in that, The transfer mechanism (200) further includes a first sliding sleeve (225), which is connected to one end of the first housing (210) near the core tube (230). The first lead screw (222) passes through the first sliding sleeve (225) and is slidably connected to the first sliding sleeve (225).

4. The method of using the coring and transfer device for in-situ seabed testing systems according to claim 1, characterized in that, The core-taking mechanism (100) further includes a plurality of parallel second guide rods (150), which are disposed in the second cavity and connected to the second housing (110). The plurality of second guide rods (150) are slidably connected to the second slider (140).

5. The method of using the coring and transfer device for in-situ seabed testing systems according to claim 1, characterized in that, The core-taking mechanism (100) further includes a second sliding sleeve (160), which is connected to one end of the second housing (110) near the transfer mechanism (200). The second lead screw (130) passes through the second sliding sleeve (160) and is slidably connected to the second sliding sleeve (160).

6. The method of using the coring and transfer device for in-situ seabed testing systems according to claim 1, characterized in that, The housing (300) has a core extraction channel (310), the outer peripheral surfaces of the first housing (210) and the second housing (110) are adapted to the inner peripheral surface of the core extraction channel (310), and the first housing (210) is capable of sliding along the core extraction channel (310).

7. The method of using the coring and transfer device for in-situ seabed testing systems according to claim 1, characterized in that, The control of the first linear drive assembly (220) to drive the piston plate (240) to displace relative to the core barrel (230) in the opposite direction of the first direction includes: Controlling the first linear drive assembly (220) to operate, causing the piston plate (240) to move from the end of the core-taking cylinder (230) away from the core-taking mechanism (100) to the end closer to the core-taking mechanism (100); and / or, The control of the first linear drive assembly (220) to operate, causing the piston plate (240) to displace relative to the core-taking cylinder (230) along the first direction, includes: Control the operation of the first linear drive assembly (220) to drive the piston plate (240) to move from the end of the core-taking cylinder (230) close to the core-taking mechanism (100) to the end away from the core-taking mechanism (100).

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