Clamp and system for ct testing sediment samples for hydrates

Abstract

The application provides a holder and system for CT testing hydrate-bearing sediment samples, and relates to the technical field of seabed survey. The holder comprises a storage cavity and a heat conduction cavity; the inside of the storage cavity is used for storing hydrate-bearing sediment samples; the storage cavity is provided with a pressurizing joint; wherein the pressurizing joint is used for flowing pressurizing medium into the storage cavity, so that the pressure in the storage cavity is equivalent to the in-situ pressure of the hydrate-bearing sediment samples; the heat conduction cavity is wrapped outside the storage cavity and is not communicated with the storage cavity; wherein the heat conduction cavity is used for containing heat conduction medium, so that the temperature in the storage cavity is equivalent to the in-situ temperature of the hydrate-bearing sediment samples through the heat exchange of the heat conduction medium. The pressure and temperature in the storage cavity can simulate the in-situ pressure and temperature of the hydrate-bearing sediment samples, so that the hydrate-bearing sediment samples can be stored in the storage cavity for a long time, and the problem of sample distortion is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of seabed survey, and in particular to a holder and a system for CT testing of hydrate-containing sediment samples. Background Art

[0002] To further explore key issues such as gas hydrate accumulation mechanisms, reservoir evaluation, and safe and efficient extraction, obtaining authentic deep-sea sediment core samples containing gas hydrates and conducting precise analytical testing is crucial. However, gas hydrates exist in extremely low-temperature and high-pressure environments, and the sampling process can easily trigger phase transitions and hydrate decomposition. This complex sampling environment creates uncertainty in current gas hydrate core testing.

[0003] During the coring process, it is necessary to ensure that the core samples are always kept at in-situ (original position) temperature and pressure conditions to avoid distortion caused by phase transitions of hydrates within the sample due to changes in temperature and / or pressure. In addition, due to the limited conditions at the offshore coring site, large, high-precision testing equipment is usually not available. Therefore, the collected samples need to be analyzed and tested in onshore laboratories using analytical methods such as industrial computed tomography (industrial CT) to perform three-dimensional structural reconstruction of deep-sea sediment core samples, thereby more accurately analyzing the distribution characteristics of natural gas hydrates within the sample.

[0004] Currently, the simple clamps of movable cabinet-type CT equipment used for temporary on-site testing of offshore coring cannot carry out long-term fidelity testing under in-situ temperature and pressure conditions, nor can they transfer samples to an off-site onshore laboratory for testing using large-scale, high-precision industrial CT. Summary of the Invention

[0005] The purpose of the present application is to overcome the defects of the prior art and provide a holder and a CT testing system for CT testing of hydrate-containing sediment samples to solve the problems in the prior art.

[0006] To solve the above problems, a first aspect of an embodiment of the present application provides a holder for CT testing of hydrate-containing sediment samples, comprising a storage chamber and a heat conduction chamber;

[0007] The interior of the storage chamber is used to store the hydrate-containing sediment sample; the storage chamber is provided with a pressurizing joint; wherein the pressurizing joint is used to supply a pressurized medium to flow into the storage chamber so that the pressure in the storage chamber is equivalent to the in-situ pressure of the hydrate-containing sediment sample;

[0008] The heat-conducting cavity is wrapped around the outside of the storage cavity and is not connected to the storage cavity; wherein, the heat-conducting cavity is used to accommodate a heat-conducting medium, so that the temperature in the storage cavity is equivalent to the in-situ temperature of the hydrate-containing sediment sample through heat exchange with the heat-conducting medium.

[0009] In a possible embodiment, an inner cylinder is further included, wherein the inner cylinder includes a base layer and a reinforcing layer for enhancing compressive strength, the storage cavity is located inside the base layer, and the reinforcing layer is sleeved on the outside of the base layer, wherein both the base layer and the reinforcing layer can be penetrated by the imaging medium used in CT testing.

[0010] In a possible embodiment, the base layer and the reinforcement layer are coaxially arranged, wherein the outer wall of the base layer is in contact with the inner wall of the reinforcement layer; the base layer includes a metal layer, and the reinforcement layer includes a carbon fiber layer;

[0011] The inner cavity of the base layer includes a first connecting section, a middle section, and a second connecting section that are connected in sequence, wherein the first connecting section and the second connecting section are respectively arranged at both ends of the middle section; a first mounting seat is provided in the first connecting section, and a second mounting seat is provided in the second connecting section, wherein the pressurizing joint is provided on the first mounting seat, and an opening is provided in the second mounting seat, wherein the opening is connected to the storage cavity, and the opening is used to allow the hydrate-containing sediment sample to enter the storage cavity.

[0012] In one possible embodiment, the first connecting section includes a first conical cavity and a first cylindrical cavity that are interconnected and coaxial, and the second connecting section includes a second conical cavity and a second cylindrical cavity that are interconnected and coaxial, wherein the first conical cavity and the second conical cavity are both adjacent to and connected to the middle section, and the contraction directions of the first conical cavity and the second conical cavity are both toward the middle section;

[0013] The first mounting seat includes a first conical portion and a first cylindrical portion that are coaxially arranged, wherein the first conical portion is inserted into the first conical cavity and fits against the inner wall of the first conical cavity, and the first cylindrical portion is fixed in the first cylindrical cavity;

[0014] The second mounting seat includes a coaxially arranged second conical portion and a second cylindrical portion, wherein the second conical portion is inserted into the second conical cavity and fits against the inner wall of the second conical cavity, and the second cylindrical portion is fixed in the second cylindrical cavity.

[0015] In one possible embodiment, a first pressing cap is fixed in the inner cavity of the first mounting seat, and the first pressing cap includes a central hole; the pressurized joint includes a base, a plug portion, and a head portion connected in sequence, the plug portion is plugged into the central hole, and the base and the head portion are placed at both ends of the central hole and are both located outside the central hole, wherein the cross-sectional area of ​​the base is larger than the cross-sectional area of ​​the central hole;

[0016] The second mounting seat includes a connecting flange located outside the second connecting section.

[0017] In a possible implementation manner, a switch device is provided on one side of the opening, and the switch device is used to open or close the opening;

[0018] The switch device includes a pneumatic ball valve, an air source and a solenoid valve. The pneumatic ball valve includes a valve body and a valve core arranged in the valve body. One end of the valve body is opposite to the storage chamber.

[0019] The air source is connected to the valve body through an air path; wherein, the air source is used to deliver air flow to the air path to drive the valve core, so that the pneumatic ball valve is opened or closed; the solenoid valve is used to control the on-off of the air path.

[0020] In a possible implementation manner, a first sealing ring is provided on an outer wall of the base, and the first sealing ring is used to seal a gap between the base and the first mounting seat;

[0021] A second sealing ring is provided on the end surface of the connecting flange close to the switch device, and the second sealing ring is used to seal the gap between the connecting flange and the switch device.

[0022] In a possible embodiment, the heat conducting chamber further comprises an outer cylinder, wherein the outer cylinder is sleeved on the outside of the inner cylinder, wherein the heat conducting chamber is located between the inner wall of the outer cylinder and the outer wall of the inner cylinder;

[0023] The outer cylinder is provided with an injection port and an exhaust port, both of which are connected to the heat conduction cavity; wherein the injection port is used for allowing the heat conduction medium to flow into the heat conduction cavity, and the exhaust port is used for allowing the heat conduction medium to flow out of the heat conduction cavity.

[0024] A second aspect of the present application provides a CT testing system, including:

[0025] a holder as described above for CT testing of sediment samples containing hydrates;

[0026] a pressure regulating device for injecting a pressurized medium at a constant pressure into the storage chamber of the holder;

[0027] The temperature regulating device is used to inject a constant temperature heat-conducting medium into the heat-conducting cavity of the clamp.

[0028] In one possible embodiment, the device further includes a pressure sensor, a temperature sensor, and a control device, wherein the pressure sensor is used to monitor in real time the pressure of the pressurized medium injected into the storage chamber by the pressure regulating device, and the temperature sensor is used to monitor in real time the temperature inside the heat transfer chamber, wherein the pressure regulating device, the temperature regulating device, the pressure sensor, and the temperature sensor are all electrically connected to the control device;

[0029] The control device is configured to send a first control signal to the pressure regulating device based on the pressure signal monitored by the pressure sensor, so as to control the flow rate and flow rate of the pressurized medium injected into the storage chamber by the pressure regulating device, so that the pressure in the storage chamber is always equivalent to the in-situ pressure of the hydrate-containing sediment sample;

[0030] The control device is further configured to send a second control signal to the temperature regulating device based on the temperature signal monitored by the temperature sensor, so as to control the flow rate and flow rate of the heat transfer medium injected into the heat transfer cavity by the temperature regulating device, so that the temperature in the heat transfer cavity is always equivalent to the in-situ temperature of the hydrate-containing sediment sample.

[0031] The beneficial effects of this application include:

[0032] The present application proposes a holder for CT testing of hydrate-containing sediment samples, comprising a storage chamber and a heat transfer chamber. By injecting a pressurized medium into the storage chamber through a pressurized joint, the pressure within the storage chamber can be brought to a level comparable to the in-situ pressure of the hydrate-containing sediment sample. By injecting a heat transfer medium into the heat transfer chamber, which surrounds the storage chamber, the temperature within the storage chamber can be brought to a level comparable to the in-situ temperature of the hydrate-containing sediment sample.

[0033] The pressure and temperature within the storage chamber simulate the in-situ pressure and temperature of hydrate-containing sediment samples, allowing them to be stored for extended periods without causing sample distortion. A gripper can be used to transfer the hydrate-containing sediment samples to a roadside laboratory, where industrial CT can be used to reconstruct the 3D structure of the sample within the storage chamber, enabling accurate analysis of the distribution characteristics of natural gas hydrates within the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A cross-sectional view of a holder for CT testing of hydrate-containing sediment samples is shown;

[0036] Figure 2 shows a cross-sectional view of a base layer;

[0037] Figure 3 shows a cross-sectional view of a first mounting base;

[0038] Figure 4 shows a cross-sectional view of a second mounting base;

[0039] Figure 5 shows a cross-sectional view of a pressurized joint;

[0040] Figure 6 A schematic diagram of a CT testing system is shown.

[0041] Description of main component symbols:

[0042] 10-holder; 11-storage chamber; 111-pressurized joint; 1111-base; 1112-connecting portion; 1113-head; 12-heat conduction chamber; 13-inner cylinder; 131-base layer; 1311-first connecting section; 1312-middle section; 1313-second connecting section; 1314-first mounting seat; 1315-second mounting seat; 1316-opening; 132-reinforcement layer; 1331-first conical cavity; 1332-first cylindrical cavity; 1341-second conical cavity; 1342-second cylindrical cavity; 1351-first conical portion; 1352-first cylindrical portion; 1 361-second conical portion; 1362-second cylindrical portion; 1371-first pressure cap; 1381-connecting flange; 141-pneumatic ball valve; 1411-valve body; 1412-valve core; 1413-upper flange; 1414-lower flange; 142-air source; 143-solenoid valve; 151-first sealing ring; 152-second sealing ring; 160-outer cylinder; 161-injection port; 162-exhaust port; 170-fidelity transfer device; 181-pressure regulating device; 182-temperature regulating device; 183-pressure sensor; 184-temperature sensor; 185-control device. DETAILED DESCRIPTION

[0043] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0045] In this application, the full name of CT is Computed Tomography, and its Chinese name is electronic computer tomography.

[0046] Example

[0047] See Figure 1 In an embodiment, a holder 10 for CT testing of a hydrate-containing sediment sample is provided, comprising a storage chamber 11 and a heat transfer chamber 12 .

[0048] The interior of the storage chamber 11 is used to store the hydrate-containing sediment sample.

[0049] The storage chamber 11 is provided with a pressurizing connector 111. This connector 111 is used to allow a pressurized medium to flow into the storage chamber 11, thereby ensuring that the pressure within the storage chamber 11 is comparable to the in-situ pressure of the hydrate-containing sediment sample. The pressurized medium is the fluid in the deep-sea environment where the hydrate-containing sediment sample resides.

[0050] The heat transfer chamber 12 surrounds the storage chamber 11 and is not connected to the storage chamber 11. The heat transfer chamber 12 is used to accommodate a heat transfer medium. Heat exchange with the heat transfer medium allows the temperature within the storage chamber 11 to be comparable to the in-situ temperature of the hydrate-containing sediment sample. The heat transfer medium can be a liquid, such as water, to reduce costs.

[0051] In this embodiment, the pressure within the storage chamber 11 is set to P1, the in-situ pressure of the hydrate-containing sediment sample is set to P0, the temperature within the storage chamber 11 is set to T1, and the in-situ temperature of the hydrate-containing sediment sample is set to T0. The pressure within the storage chamber 11 being equivalent to the in-situ pressure of the hydrate-containing sediment sample means that P1 = P0 ± P2; the temperature within the storage chamber 11 being equivalent to the in-situ temperature of the hydrate-containing sediment sample means that T1 = T0 ± T2. P2 is the pressure compensation value, and T2 is the temperature compensation value. P2 and T2 can be obtained through experiments or other means.

[0052] When the pressure in the storage chamber 11 is P1 and the temperature is T1, the storage chamber 11 reaches the conditions for storing the hydrate-containing sediment sample, wherein the hydrate-containing sediment sample can be stored in the storage chamber 11 for a long time with high fidelity under these conditions, and the hydrate in the sample will not undergo phase change.

[0053] In this embodiment, the holder 10 also includes an inner tube 13, which comprises a base layer 131 and a reinforcing layer 132 for enhancing compressive strength. The storage chamber 11 is located within the base layer 131, and the reinforcing layer 132 is positioned over the base layer 131. Both the base layer 131 and the reinforcing layer 132 are permeable to the imaging medium used in CT testing. The reinforcing layer 132 effectively enhances the durability of the inner tube 13, preventing cracking or deformation of the inner tube 13 due to excessive pressure within the storage chamber 11. The imaging medium can be X-rays.

[0054] The base layer 131 and the reinforcement layer 132 have the same cross-sectional shape. In this embodiment, the base layer 131 and the reinforcement layer 132 are both circular in cross-sectional shape, and both are hollow in interior. In other embodiments, the cross-sectional shape of the base layer 131 and the reinforcement layer 132 may be polygonal, etc.

[0055] The base layer 131 and the reinforcement layer 132 are coaxially arranged, wherein the outer wall of the base layer 131 is in contact with the inner wall of the reinforcement layer 132 .

[0056] In this embodiment, the base layer 131 is a metal layer, and the reinforcement layer 132 is a carbon fiber layer. The base layer 131 can be made of a metal material such as aluminum alloy, thereby increasing its strength. The thickness of both the base layer 131 and the reinforcement layer 132 must be controlled within a certain range, both to reduce costs and to prevent thickness from affecting CT imaging.

[0057] like Figure 2 As shown, the inner cavity of the base layer 131 includes a first connecting segment 1311 , a middle segment 1312 and a second connecting segment 1313 that are connected in sequence, wherein the first connecting segment 1311 and the second connecting segment 1313 are respectively disposed at two ends of the middle segment 1312 .

[0058] A hollow first mounting seat 1314 is disposed within the first connecting section 1311, and a second mounting seat 1315 is disposed within the second connecting section 1313. The first mounting seat 1314 is provided with a pressurized connector 111, and the second mounting seat 1315 is connected to a switch device. The inner cavity of the first mounting seat 1314 is connected to the storage chamber 11 and is coaxial.

[0059] In this embodiment, an opening 1316 is provided through the second mounting base 1315. The opening 1316 is connected to and coaxial with the storage chamber 11. The opening 1316 is used to allow the hydrate-containing sediment sample to enter the storage chamber 11. Specifically, a switch device is provided at one end of the opening 1316 away from the storage chamber 11. The switch device is used to open or close the opening 1316. Figure 6 The switch device includes a pneumatic ball valve 141, an air source 142, and a solenoid valve 143. The pneumatic ball valve 141 includes a valve body 1411 and a valve core 1412 disposed within the valve body 1411. One end of the valve body 1411 faces the storage chamber 11. The air source 142 is connected to the valve body 1411 via an air circuit. The air source 142 is used to deliver air into the air circuit to drive the valve core 1412, thereby opening or closing the pneumatic ball valve 141. The solenoid valve 143 is used to control the on / off state of the air circuit.

[0060] like Figure 2 As shown, the first connecting section 1311 includes a first conical cavity 1331 and a first cylindrical cavity 1332 that are connected and coaxial, and the second connecting section 1313 includes a second conical cavity 1341 and a second cylindrical cavity 1342 that are connected and coaxial, wherein the first conical cavity 1331 and the second conical cavity 1341 are both adjacent to and connected with the middle section 1312, and the contraction directions of the first conical cavity 1331 and the second conical cavity 1341 are both toward the middle section 1312.

[0061] like Figure 3 As shown, the first mounting seat 1314 includes a coaxially arranged first conical portion 1351 and a first cylindrical portion 1352. The first conical portion 1351 is inserted into the first conical cavity 1331 and fits against the inner wall of the first conical cavity 1331, while the first cylindrical portion 1352 is fixed in the first cylindrical cavity 1332.

[0062] The first conical portion 1351 and the first conical cavity 1331 can be assembled by interference fit, thereby achieving a sealing effect, thereby preventing leakage of the pressurized medium filled in the storage cavity 11. In order to improve the sealing effect, sealant or the like can be filled in the gap between the first conical portion 1351 and the first conical cavity 1331.

[0063] The first cylindrical portion 1352 and the first cylindrical cavity 1332 can be fixedly connected by means of a threaded connection or the like. Specifically, the outer wall of the first cylindrical portion 1352 is provided with an external thread, and the inner wall of the first cylindrical cavity 1332 is provided with a corresponding internal thread. During assembly, the first mounting seat 1314 is inserted into the first connecting section 1311 of the base layer 131 and rotated relative to the base layer 131, thereby locking the external thread of the first cylindrical portion 1352 with the internal thread of the first cylindrical cavity 1332. During the relative rotation process, the first mounting seat 1314 is inserted deeper into the first connecting section 1311, thereby making the first conical portion 1351 and the first conical cavity 1331 fit more tightly.

[0064] like Figure 4 As shown, the second mounting seat 1315 includes a coaxially arranged second conical portion 1361 and a second cylindrical portion 1362. The second conical portion 1361 is inserted into the second conical cavity 1341 and fits against the inner wall of the second conical cavity 1341, and the second cylindrical portion 1362 is fixed in the second cylindrical cavity 1342.

[0065] The assembly method between the second mounting seat 1315 and the second connecting section 1313 can refer to the assembly method between the first mounting seat 1314 and the first connecting section 1311 described above, and will not be repeated here.

[0066] like Figure 1 As shown, a first pressing cap 1371 is fixed in the inner cavity of the first mounting seat 1314, and the first pressing cap 1371 includes a center hole. Figure 5 As shown, the pressurized connector 111 comprises a base 1111, a plug portion 1112, and a head portion 1113, which are sequentially connected. The plug portion 1112 is inserted into the center hole, with the base 1111 and head portion 1113 positioned at opposite ends of the center hole and both located outside the center hole. The cross-sectional area of ​​the base 1111 is larger than that of the center hole. The plug portion 1112 is fixedly connected to the center hole, and the fixed connection between the plug portion 1112 and the center hole can be achieved through an interference fit.

[0067] like Figure 1 and Figure 4 As shown, the second mounting base 1315 includes a connecting flange 1381 located outside the second connecting section 1313, and the connecting flange 1381 is fixedly connected to the upper flange 1413 of the pneumatic ball valve 141. The connecting flange 1381 and the upper flange 1413 of the pneumatic ball valve 141 can be fixedly connected by bolts or other means.

[0068] In this embodiment, a first sealing ring 151 is provided on the outer wall of the base 1111. This first sealing ring 151 is used to seal the gap between the base 1111 and the first mounting seat 1314. A second sealing ring 152 is provided on the end surface of the connecting flange 1381, which is close to the switch device. This second sealing ring 152 is used to seal the gap between the connecting flange 1381 and the upper flange 1413 of the pneumatic ball valve 141. The provision of the first and second sealing rings 151, 152 improves the sealing performance of the storage chamber 11, preventing leakage of the pressurized medium within the storage chamber 11, thereby maintaining a stable pressure within the storage chamber 11.

[0069] In this embodiment, the holder 10 further includes an outer cylinder 160, which is sleeved onto the outer surface of the inner cylinder 13. The heat transfer cavity 12 is located between the inner wall of the outer cylinder 160 and the outer wall of the inner cylinder 13. The outer cylinder 160 is also permeable to the imaging medium used in CT testing. To reduce costs, the outer cylinder 160 can be made of materials such as plastic.

[0070] To facilitate the circulation of the heat transfer medium, the outer cylinder 160 is provided with an inlet 161 and an outlet 162, both of which are connected to the heat transfer cavity 12. The inlet 161 allows the heat transfer medium to flow into the heat transfer cavity 12, while the outlet 162 allows the heat transfer medium to flow out of the heat transfer cavity 12. The temperature of the heat transfer medium entering the inlet 161 can be T1. After the heat transfer medium circulates within the heat transfer cavity 12 for a period of time, the temperature within the storage cavity 11 stabilizes at T1 due to heat transfer.

[0071] The hydrate-containing sediment sample is pre-stored in a fidelity transfer device 170. This device is used for temporary storage of the hydrate-containing sediment sample. The pressure and temperature within the device are comparable to the in-situ pressure and temperature of the hydrate-containing sediment sample, respectively. In the accompanying drawings, the fidelity transfer device 170 is represented by a circle. The structure of the fidelity transfer device 170 can be referenced to existing designs.

[0072] Before transferring the hydrate-containing sediment sample from the fidelity transfer device 170 to the storage chamber 11 of the holder 10, the storage chamber 11 is first primed for storage of the hydrate-containing sediment sample using a pressurized medium and a heat-conducting medium. The flange of the fidelity transfer device 170 is connected to the lower flange 1414 of the pneumatic ball valve 141. The pneumatic ball valve 141 is then opened, and the hydrate-containing sediment sample in the fidelity transfer device 170 is moved into the storage chamber 11 using a push rod and other devices. The pressure and temperature within the storage chamber 11 of the holder 10 are monitored in real time. Finally, the pneumatic ball valve 141 is closed using the solenoid valve 143 and air source 142. After the internal pressure of the fidelity transfer device 170 is released, the connection between the pneumatic ball valve 141 and the fidelity transfer device 170 is disconnected. The holder 10 is then transferred to a large, high-precision industrial CT stage in an onshore laboratory, allowing for off-site CT testing of the hydrate-containing sediment sample.

[0073] See Figure 6 In this embodiment, a CT testing system is also proposed, including:

[0074] The holder 10 mentioned above;

[0075] a pressure regulating device 181 for injecting a pressurized medium at a constant pressure into the storage chamber 11 of the holder 10;

[0076] The temperature regulating device 182 is used to inject a constant temperature heat-conducting medium into the heat-conducting cavity 12 of the holder 10 .

[0077] Furthermore, the CT testing system also includes a pressure sensor 183, a temperature sensor 184 and a control device 185. The pressure sensor 183 is used to monitor in real time the pressure of the pressurized medium injected into the storage chamber 11 by the pressure regulating device 181, and the temperature sensor 184 is used to monitor in real time the temperature inside the heat conduction chamber 12. The pressure regulating device 181, the temperature regulating device 182, the pressure sensor 183 and the temperature sensor 184 are all electrically connected to the control device 185.

[0078] The pressure regulating device 181 may be a constant pressure air injection pump, the temperature regulating device 182 may be a constant temperature water bath, and the control device 185 may be a single chip microcomputer, a computer, etc.

[0079] In this embodiment, the control device 185 is configured to send a first control signal to the pressure regulating device 181 based on the pressure signal monitored by the pressure sensor 183, so as to control the flow rate and flow velocity of the pressurized medium injected into the storage chamber 11 by the pressure regulating device 181, so that the pressure in the storage chamber 11 is always equivalent to the in-situ pressure of the hydrate-containing sediment sample.

[0080] The control device 185 is also used to send a second control signal to the temperature regulating device 182 based on the temperature signal monitored by the temperature sensor 184, so as to control the flow rate and flow rate of the heat-conducting medium injected into the heat-conducting cavity 12 by the temperature regulating device 182, so that the temperature in the heat-conducting cavity 12 is always equivalent to the in-situ temperature of the hydrate-containing sediment sample.

[0081] Before conducting CT testing, the in-situ seafloor coring environment within the storage chamber 11 of the holder 10 must be reconstructed in advance. First, the injection port 161 and discharge port 162 of the holder 10 are positioned adjacent to corresponding interfaces on the temperature control device 182. The circulating water temperature is set to the in-situ seafloor coring environment temperature. The external circulation of the temperature control device 182 is activated. After the temperature sensor 184 measures the temperature within the heat transfer chamber 12 and reaches the in-situ seafloor coring temperature and stabilizes for a period of time, the pressurized connector 111 on the holder 10 is connected to the pressure control device 181. Deep-sea environmental fluid is injected into the storage chamber 11 to the in-situ seafloor coring pressure conditions, and the injection pump is set to constant pressure tracking. After ensuring that the temperature and pressure conditions within the storage chamber 11 are consistent with those of the fidelity transfer device 170, the hydrate-containing sediment sample within the fidelity transfer device 170 can be transferred to the storage chamber 11 of the CT holder 10.

[0082] Afterwards, the temperature and pressure inside the storage chamber 11 of the holder 10 are monitored in real time, and the pressure regulating device 181 and the temperature regulating device 182 are used to achieve long-term and stable tracking compensation of the temperature and pressure of the hydrate-containing sediment sample.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0084] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A holder for CT testing of sediment samples containing hydrates, characterized in that: including a storage cavity and a heat conduction cavity; The interior of the storage chamber is used to store a hydrate-containing sediment sample; wherein the hydrate-containing sediment sample is pre-stored in a fidelity transfer device, and the pressure and temperature inside the fidelity transfer device are respectively equivalent to the in-situ pressure and in-situ temperature of the hydrate-containing sediment sample; before the hydrate-containing sediment sample in the fidelity transfer device is transferred to the storage chamber, the storage chamber is first subjected to the action of a pressurizing medium and a heat-conducting medium to achieve a condition suitable for storing the hydrate-containing sediment sample; The storage chamber is provided with a pressurizing joint, wherein the pressurizing joint is used to supply a pressurized medium to flow into the storage chamber, so that the pressure in the storage chamber is equivalent to the in-situ pressure of the hydrate-containing sediment sample; The heat-conducting cavity is wrapped around the outside of the storage cavity and is not connected to the storage cavity; wherein the heat-conducting cavity is used to accommodate a heat-conducting medium, so that the temperature in the storage cavity is equivalent to the in-situ temperature of the hydrate-containing sediment sample through heat exchange with the heat-conducting medium; The device further comprises an inner cylinder, the inner cylinder comprising a base layer and a reinforcing layer for enhancing compressive strength, the storage cavity being located inside the base layer, and the reinforcing layer being sleeved outside the base layer, wherein both the base layer and the reinforcing layer can be penetrated by an imaging medium used in CT testing; The base layer and the reinforcement layer are coaxially arranged, wherein the outer wall of the base layer is in contact with the inner wall of the reinforcement layer; the base layer includes a metal layer, and the reinforcement layer includes a carbon fiber layer.

2. The holder for CT testing of hydrate-containing sediment samples according to claim 1, characterized in that: The inner cavity of the base layer includes a first connecting section, a middle section, and a second connecting section that are connected in sequence, wherein the first connecting section and the second connecting section are respectively arranged at both ends of the middle section; a first mounting seat is provided in the first connecting section, and a second mounting seat is provided in the second connecting section, wherein the pressurizing joint is provided on the first mounting seat, and an opening is provided in the second mounting seat, wherein the opening is connected to the storage cavity, and the opening is used to allow the hydrate-containing sediment sample to enter the storage cavity.

3. The holder for CT testing of hydrate-containing sediment samples according to claim 2, characterized in that: The first connecting section includes a first conical cavity and a first cylindrical cavity that are connected and coaxial, and the second connecting section includes a second conical cavity and a second cylindrical cavity that are connected and coaxial, wherein the first conical cavity and the second conical cavity are both adjacent to and connected to the middle section, and the contraction directions of the first conical cavity and the second conical cavity are both toward the middle section; The first mounting seat includes a first conical portion and a first cylindrical portion that are coaxially arranged, wherein the first conical portion is inserted into the first conical cavity and fits against the inner wall of the first conical cavity, and the first cylindrical portion is fixed in the first cylindrical cavity; The second mounting seat includes a coaxially arranged second conical portion and a second cylindrical portion, wherein the second conical portion is inserted into the second conical cavity and fits against the inner wall of the second conical cavity, and the second cylindrical portion is fixed in the second cylindrical cavity.

4. The holder for CT testing of hydrate-containing sediment samples according to claim 3, characterized in that: A first pressing cap is fixed in the inner cavity of the first mounting seat, and the first pressing cap includes a central hole; the pressurized joint includes a base, a plug-in portion, and a head portion connected in sequence, the plug-in portion is plugged into the central hole, and the base and the head portion are placed at both ends of the central hole and are both located outside the central hole, wherein the cross-sectional area of ​​the base is larger than the cross-sectional area of ​​the central hole; The second mounting seat includes a connecting flange located outside the second connecting section.

5. The holder for CT testing of hydrate-containing sediment samples according to claim 4, characterized in that: A switch device is provided on one side of the opening, and the switch device is used to open or close the opening; The switch device includes a pneumatic ball valve, an air source and a solenoid valve. The pneumatic ball valve includes a valve body and a valve core arranged in the valve body. One end of the valve body is opposite to the storage chamber. The air source is connected to the valve body through an air path; wherein, the air source is used to deliver air flow to the air path to drive the valve core, so that the pneumatic ball valve is opened or closed; the solenoid valve is used to control the on-off of the air path.

6. The holder for CT testing of hydrate-containing sediment samples according to claim 5, characterized in that: A first sealing ring is provided on the outer wall of the base, and the first sealing ring is used to seal the gap between the base and the first mounting seat; A second sealing ring is provided on the end surface of the connecting flange close to the switch device, and the second sealing ring is used to seal the gap between the connecting flange and the switch device.

7. The holder for CT testing of hydrate-containing sediment samples according to claim 2, characterized in that: It also includes an outer cylinder, which is sleeved on the outside of the inner cylinder, wherein the heat conduction cavity is located between the inner wall of the outer cylinder and the outer wall of the inner cylinder; The outer cylinder is provided with an injection port and an exhaust port, both of which are connected to the heat conduction cavity; wherein the injection port is used for allowing the heat conduction medium to flow into the heat conduction cavity, and the exhaust port is used for allowing the heat conduction medium to flow out of the heat conduction cavity.

8. CT test system, characterized in that, include: The holder for CT testing of hydrate-containing sediment samples according to any one of claims 1 to 7; a pressure regulating device for injecting a pressurized medium at a constant pressure into the storage chamber of the holder; The temperature regulating device is used to inject a constant temperature heat-conducting medium into the heat-conducting cavity of the clamp.

9. The CT testing system according to claim 8, characterized in that: The device further comprises a pressure sensor, a temperature sensor, and a control device, wherein the pressure sensor is used to monitor in real time the pressure of the pressurized medium injected into the storage cavity by the pressure regulating device, and the temperature sensor is used to monitor in real time the temperature inside the heat transfer cavity, wherein the pressure regulating device, the temperature regulating device, the pressure sensor, and the temperature sensor are all electrically connected to the control device; The control device is configured to send a first control signal to the pressure regulating device based on the pressure signal monitored by the pressure sensor, so as to control the flow rate and flow rate of the pressurized medium injected into the storage chamber by the pressure regulating device, so that the pressure in the storage chamber is always equivalent to the in-situ pressure of the hydrate-containing sediment sample; The control device is further configured to send a second control signal to the temperature regulating device based on the temperature signal monitored by the temperature sensor, so as to control the flow rate and flow rate of the heat transfer medium injected into the heat transfer cavity by the temperature regulating device, so that the temperature in the heat transfer cavity is always equivalent to the in-situ temperature of the hydrate-containing sediment sample.

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