Hydrate core in-situ dissociation test apparatus and method

Abstract

The application discloses a hydrate core in-situ decomposition test device, which comprises a support assembly, a decomposition mechanism, a temperature and pressure control mechanism and a gas-liquid separation treatment mechanism; the support assembly is arranged in a shipborne laboratory; the decomposition mechanism is communicated with a pressure maintaining transfer device; the temperature and pressure control mechanism controls the temperature and pressure of the decomposition mechanism; and the gas-liquid separation treatment mechanism separates the decomposition products of the core and stores them; the hydrate core in-situ decomposition test device provided by the application is convenient for in-situ decomposition test of a hydrate core, so that the data of the hydrate core can be accurately and rapidly obtained. The application further provides a hydrate core in-situ decomposition test method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrate core decomposition, in particular to a hydrate core in-situ decomposition test device and method. BACKGROUND

[0002] Natural gas hydrate has the characteristics of wide distribution, large resource quantity, high energy density, clean and environmental protection, etc., and is the strategic commanding point of future global energy development; China's natural gas hydrate resource reserves are extremely rich, attaches great importance to the development and utilization of natural gas hydrate, and has made it an important content of development strategy planning and energy technology revolution, and the industrialization development of natural gas hydrate is of great significance to guarantee national energy resource security and improve energy structure.

[0003] At present, the decomposition test and productivity test of natural gas hydrate are still mainly based on artificially prepared hydrate core samples, which leads to a gap between the test results and the actual engineering, and more accurate quasi-in-situ test data is needed for comparison and correction. The natural gas hydrate core sample obtained by the coring tool has the characteristics of easy decomposition and difficult storage, and cannot be transported to the land laboratory for test, which leads to the difficulty of hydrate core in-situ decomposition test. SUMMARY

[0004] The purpose of the present application is to provide a hydrate core in-situ decomposition test device and method to solve the above-mentioned problems existing in the prior art, and to facilitate the in-situ decomposition test of natural gas hydrate core, so as to accurately and quickly obtain the data of hydrate core.

[0005] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0006] The application provides a hydrate core in-situ decomposition test device, which comprises a support assembly, a decomposition mechanism, a temperature and pressure control mechanism and a gas-liquid separation processing mechanism; the support assembly is arranged in a shipborne laboratory; the decomposition mechanism is arranged on the support assembly and comprises a transfer assembly and a reaction cylinder arranged coaxially; the reaction cylinder is provided with an exhaust port and a liquid discharge port communicating with the inside; one end of the transfer assembly is used for communicating with a pressure retention transfer device, and the other end of the transfer assembly communicates with one end of the reaction cylinder, and the other end of the reaction cylinder is sealed; the transfer assembly is used for making one end of the reaction cylinder communicate with the pressure retention transfer device so that the core can enter the reaction cylinder from the pressure retention transfer device, and the transfer assembly is also used for blocking one end of the reaction cylinder from the pressure retention transfer device; the temperature and pressure control mechanism is arranged on the support assembly and comprises a temperature control assembly, a pressure control assembly and an overflow assembly; the temperature control assembly is used for controlling the temperature in the reaction cylinder; the pressure control assembly communicates with the inside of the reaction cylinder and is used for regulating and controlling the pressure in the reaction cylinder; the overflow assembly has an overflow channel, the overflow channel communicates with the exhaust port and the liquid discharge port, and the overflow assembly has a gas-liquid outlet communicating with the overflow channel; the overflow assembly is used for making the gas discharged from the exhaust port and the liquid discharged from the liquid discharge port enter the overflow channel and be discharged through the gas-liquid outlet, and the overflow assembly can also regulate and control the overflow pressure in the overflow channel; the gas-liquid separation processing mechanism is arranged on the support assembly and comprises a gas-liquid separation component, a gas storage assembly, a liquid storage assembly and a vacuum pumping assembly; the gas-liquid separation component communicates with the gas-liquid outlet; the gas-liquid separation component has a gas outlet and a liquid outlet communicating with the gas storage assembly and the liquid storage assembly respectively; the vacuum pumping assembly communicates with the gas storage assembly; and the vacuum pumping assembly is used for pumping vacuum in the gas storage assembly, the gas-liquid separation component and the space between the gas-liquid separation component and the overflow assembly.

[0007] Preferably, the transfer assembly comprises a clamp and a ball valve; one end of the ball valve is fixedly connected with the clamp and communicates with the clamp; the other end of the ball valve fixedly communicates with the reaction cylinder and is circumferentially sealed; the clamp is used for communicating with the pressure retention transfer device; the ball valve is used for controlling the on-off between the reaction cylinder and the pressure retention transfer device; one end of the reaction cylinder away from the transfer assembly is provided with a cylinder end cover; a filter screen is arranged in the reaction cylinder close to the cylinder end cover; the exhaust port is arranged on the upper side of the reaction cylinder; the liquid discharge port is arranged on the lower side of the reaction cylinder; and the filter screen is arranged on the side of the exhaust port and the liquid discharge port close to the transfer assembly.

[0008] Preferably, the temperature control assembly comprises a refrigeration device, a coil pipe and a first temperature monitoring component, the refrigeration device is arranged on the support assembly, the coil pipe is used for spirally winding on the outer wall of the reaction cylinder, the refrigeration device is in communication with the coil pipe, the refrigeration device is used for refrigerating cooling liquid and circulating the cooling liquid into the coil pipe, and the first temperature monitoring component is used for monitoring the temperature information of the cooling liquid in the refrigeration device.

[0009] Preferably, the pressure control assembly comprises an overflow valve and a communication valve in communication with the inside of the reaction cylinder, the overflow valve is used for controlling the upper limit of the pressure in the reaction cylinder, and the inside of the reaction cylinder is used for being in communication with the outside through the communication valve and being pressurized or depressurized.

[0010] Preferably, the overflow assembly comprises a back pressure valve and an adjusting component, the back pressure valve has the overflow channel and the gas-liquid outlet, the back pressure valve is in communication with the gas outlet and the liquid outlet, the adjusting component is connected with the back pressure valve and is used for adjusting and controlling the overflow pressure in the overflow channel, the reaction cylinder is provided with a first pressure monitoring component for monitoring the internal pressure, and the gas-liquid outlet of the back pressure valve is provided with a second pressure monitoring component for monitoring the pressure of the gas-liquid outlet.

[0011] Preferably, the gas-liquid separation component is arranged as a gas-liquid separator, the gas storage assembly is arranged as a gas storage tank, the vacuum pumping assembly is arranged as a vacuum pump, the gas-liquid separator, the gas storage tank and the vacuum pump are all arranged on the support assembly, and the bottom of the gas storage tank is further provided with a blowdown port; the gas storage tank is provided with a second temperature monitoring component and a third pressure monitoring component for monitoring the temperature and the pressure in the inside of the gas storage tank, respectively.

[0012] Preferably, the liquid storage assembly comprises a plurality of liquid storage tanks arranged side by side and vertically, each of the liquid storage tanks is arranged on the support assembly, the liquid outlet is in communication with each of the liquid storage tanks through an inclined water inlet pipe, the height of the communication ports of the plurality of liquid storage tanks and the water inlet pipe gradually increases along the fluid flow direction in the water inlet pipe, and each of the liquid storage tanks is provided with a liquid level monitoring component for monitoring the internal liquid level.

[0013] Preferably, the device further comprises a data acquisition control mechanism and a terminal control mechanism, both of which are arranged on the support assembly; the data acquisition control mechanism is in communication connection with the first temperature monitoring component and the refrigeration device, and is used for receiving the cooling liquid temperature information in the refrigeration device and controlling the action of the refrigeration device; the data acquisition control mechanism is also in communication connection with the first pressure monitoring component, the second pressure monitoring component and the adjusting component, and is used for receiving the pressure information inside the reaction cylinder and the pressure information of the gas-liquid outlet and controlling the action of the adjusting component; the data acquisition control mechanism is also in communication connection with the second temperature monitoring component and the third pressure monitoring component, and is used for receiving the temperature and pressure information in the gas storage tank; the data acquisition control mechanism is also in communication connection with each liquid level monitoring component, and is used for receiving the liquid level information in each liquid storage tank; the data acquisition control mechanism is also in communication connection with the vacuum pumping assembly, and is used for controlling the action of the vacuum pumping assembly; the data acquisition control mechanism is also in communication connection with the terminal control mechanism, the terminal control mechanism is used for receiving and displaying the monitoring information of the first pressure monitoring component, the second pressure monitoring component, the second temperature monitoring component, the third pressure monitoring component and the liquid level monitoring component sent by the data acquisition control mechanism, and the terminal control mechanism can receive external control instructions and send them to the data acquisition control mechanism to control the action of the refrigeration device, the adjusting component and the vacuum pumping assembly.

[0014] Preferably, the device further comprises a walking and lifting assembly arranged on the support assembly, which is used for supporting the support assembly to walk and adjusting the height of the decomposition mechanism for docking with the pressure maintaining and transferring device.

[0015] The application also provides a hydrate core in-situ decomposition test method based on the above-mentioned hydrate core in-situ decomposition test device, which comprises the following steps:

[0016] Docking one end of the transfer assembly with the pressure maintaining and transferring device;

[0017] Controlling the transfer assembly to block the reaction cylinder from the pressure maintaining and transferring device, controlling the overflow assembly to block the overflow channel, controlling the temperature inside the reaction cylinder to maintain at a preset temperature by the temperature control assembly, and pressurizing the inside of the reaction cylinder to the same pressure as the inside of the pressure maintaining and transferring device by the pressure control assembly;

[0018] The transfer assembly is controlled to make the reaction cylinder communicate with the pressure maintaining transfer device, to transfer the core in the pressure maintaining transfer device to the reaction cylinder, the transfer assembly is controlled to make the reaction cylinder block the pressure maintaining transfer device, and the vacuumizing assembly is used to vacuumize the gas storage assembly, the gas-liquid separation component and the gas-liquid separation component and the flow-through assembly.

[0019] The flow-through pressure in the flow-through channel is gradually reduced, and then the pressure in the reaction cylinder is gradually reduced, the hydrate in the core is gradually decomposed, and enters the gas-liquid separation component through the gas outlet and the liquid outlet to be separated, the separated gas enters the gas storage assembly to be stored, and the separated liquid enters the liquid storage assembly to be stored.

[0020] The present application has the following technical effects compared with the prior art:

[0021] The hydrate core in-situ decomposition test device provided by the present application is supported by the support assembly, so as to be arranged in a shipborne laboratory, to quickly perform decomposition test of natural gas hydrate without manually prepared hydrate and transferred core. First, one end of the transfer assembly is connected with the pressure maintaining transfer device. Then, the transfer assembly is controlled to make the reaction cylinder block the pressure maintaining transfer device, the flow-through assembly is controlled to block the flow-through channel, to create a sealed environment in the reaction cylinder, so as to facilitate temperature and pressure control. The temperature control assembly is used to control the internal temperature of the reaction cylinder to be maintained at a preset temperature, such as an in-situ temperature. The pressure control assembly is used to pressurize the internal reaction cylinder to the same pressure as the pressure maintaining transfer device, to create an in-situ environment of the core in the reaction cylinder. Then, the transfer assembly is controlled to make the reaction cylinder communicate with the pressure maintaining transfer device, to transfer the core in the pressure maintaining transfer device to the reaction cylinder, the transfer assembly is controlled to make the reaction cylinder block the pressure maintaining transfer device, to realize pressure maintaining transfer of the core, and the vacuumizing assembly is used to vacuumize the gas storage assembly, the gas-liquid separation component and the gas-liquid separation component and the flow-through assembly, to avoid that components existing in the subsequent pipeline or mechanism affect the content of the core decomposition product, and to facilitate the core decomposition product in the reaction cylinder to be extracted after vacuumizing. Then, the flow-through pressure in the flow-through channel is gradually reduced, and then the pressure in the reaction cylinder is gradually reduced, the hydrate in the core is gradually decomposed, and enters the gas-liquid separation component through the gas outlet and the liquid outlet to be separated, the separated gas enters the gas storage assembly to be stored, and the separated liquid enters the liquid storage assembly to be stored, to facilitate key parameters such as hydrate core gas production and liquid production to be quickly obtained, and to facilitate subsequent exploration of the decomposition mechanism of the in-situ obtained hydrate core sample.

[0022] The application further provides a hydrate core in-situ decomposition test method, which can transfer the core under pressure and quickly carry out in-situ decomposition experiments on the hydrate core, so as to quickly obtain key parameters such as the gas production and liquid production of the hydrate core, and facilitate subsequent exploration of the decomposition mechanism of the in-situ obtained hydrate core sample. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0024] Figure 1 A structural schematic view of a hydrate core in-situ decomposition test device provided for Embodiment One is shown in the figure.

[0025] Figure 2 A structural schematic view of a support assembly provided for Embodiment One is shown in the figure.

[0026] Figure 3 A structural schematic view of a decomposition mechanism provided for Embodiment One is shown in the figure.

[0027] Figure 4 A structural schematic view of a temperature and pressure control mechanism provided for Embodiment One is shown in the figure.

[0028] Figure 5 A structural schematic view of a gas-liquid separation treatment mechanism provided for Embodiment One is shown in the figure.

[0029] Figure 6 A structural schematic view of a liquid storage assembly provided for Embodiment One is shown in the figure.

[0030] Figure 7 A communication connection schematic view of a data acquisition control mechanism provided for Embodiment One is shown in the figure.

[0031] In the figure:

[0032] 1 - support assembly; 101 - aluminum profile; 102 - connecting piece; 103 - lower support plate; 104 - upper support plate; 105 - first support block; 106 - second support block; 107 - mounting bracket;

[0033] 2 - decomposition mechanism; 201 - hoop; 202 - hoop interface; 203 - ball valve body; 204 - ball valve switch handle; 205 - cylinder pressure ring flange; 206 - reaction cylinder; 207 - core sample tube; 208 - exhaust port; 209 - cylinder end cover; 210 - end cover sealing ring; 211 - liquid discharge port; 212 - filter screen; 213 - first sealing ring;

[0034] 3-temperature and pressure control mechanism; 301-refrigeration device; 302-first temperature monitoring component; 303-coil pipe; 304-overflow valve; 305-communication valve; 306-first pressure monitoring component; 307-first fixed support; 308-stepping motor; 309-coupling; 310-back pressure valve; 311-second pressure monitoring component; 312-gas-liquid outlet;

[0035] 4-gas-liquid separation processing mechanism; 401-liquid outlet; 402-gas-liquid separation component; 403-second fixed support; 404-gas outlet; 405-gas storage assembly; 406-second temperature monitoring component; 407-third pressure monitoring component; 408-third fixed support; 409-waste outlet; 410-vacuum pumping assembly; 411-fourth fixed support; 412-liquid level monitoring component; 413-height difference gasket; 414-upper end cover; 415-water inlet pipe; 416-liquid storage tank; 417-second sealing ring; 418-lower end cover;

[0036] 5-data acquisition control mechanism; 6-terminal control mechanism; 7-walking and lifting assembly. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] The present application aims to provide a hydrate core in-situ decomposition test device and method to solve the problems in the prior art and facilitate in-situ decomposition test of natural gas hydrate cores to accurately and quickly obtain data of the hydrate cores.

[0039] To make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0040] Embodiment one

[0041] The present embodiment provides a hydrate core in-situ decomposition test device, please refer to Figures 1-7, including a support assembly 1, a decomposition mechanism 2, a temperature and pressure control mechanism 3, and a gas-liquid separation treatment mechanism 4; the support assembly 1 is arranged in a shipborne laboratory; the decomposition mechanism 2 is arranged on the support assembly 1 and includes a transfer assembly and a reaction cylinder 206 arranged coaxially, the reaction cylinder 206 is provided with an exhaust port 208 and a liquid discharge port 211 communicating with the inside; one end of the transfer assembly is arranged in communication with a pressure maintaining transfer device, the other end of the transfer assembly is arranged in communication with one end of the reaction cylinder 206, and the other end of the reaction cylinder 206 is sealed; the transfer assembly is arranged to make one end of the reaction cylinder 206 communicate with the pressure maintaining transfer device so that the core can enter the reaction cylinder 206 from the pressure maintaining transfer device, and the transfer assembly is also arranged to block one end of the reaction cylinder 206 from the pressure maintaining transfer device; the temperature and pressure control mechanism 3 is arranged on the support assembly 1 and includes a temperature control assembly, a pressure control assembly, and an overflow assembly; the temperature control assembly is arranged to control the temperature in the reaction cylinder 206; the pressure control assembly is arranged in communication with the inside of the reaction cylinder 206 and is arranged to regulate the pressure in the reaction cylinder 206; the overflow assembly has an overflow channel therein, the overflow channel is in communication with the exhaust port 208 and the liquid discharge port 211, and the overflow assembly has a gas-liquid outlet 312 connected with the overflow channel, the overflow assembly is arranged to make the gas discharged from the exhaust port 208 and the liquid discharged from the liquid discharge port 211 enter the overflow channel and be discharged through the gas-liquid outlet 312, and the overflow assembly is also arranged to regulate the overflow pressure in the overflow channel; the gas-liquid separation treatment mechanism 4 is arranged on the support assembly 1 and includes a gas-liquid separation component 402, a gas storage assembly 405, a liquid storage assembly, and a vacuum pumping assembly 410, the gas-liquid separation component 402 is in communication with the gas-liquid outlet 312, the gas-liquid separation component has a gas outlet 404 and a liquid outlet 401 in communication with the gas storage assembly 405 and the liquid storage assembly respectively; the vacuum pumping assembly 410 is in communication with the gas storage assembly, and the vacuum pumping assembly 410 is arranged to pump vacuum between the gas storage assembly, the gas-liquid separation component 402, and the overflow assembly.

[0042] The whole support is carried out through the support assembly 1, so that the decomposition test of the natural gas hydrate is quickly carried out in the shipborne laboratory without the artificial preparation of the hydrate and the transfer of the core; first, one end of the transfer assembly is connected with the pressure maintaining transfer device; then the transfer assembly is controlled to block the reaction cylinder 206 and the pressure maintaining transfer device, the flow assembly is controlled to block the flow channel, a sealed environment is created in the reaction cylinder 206, temperature control is facilitated, the temperature inside the reaction cylinder 206 is controlled by the temperature control assembly to be maintained at a preset temperature such as an in-situ temperature, the reaction cylinder 206 is pressurized to the same pressure as the pressure in the pressure maintaining transfer device by the pressure control assembly, and an in-situ environment of the core is created in the reaction cylinder 206; then the transfer assembly is controlled to communicate the reaction cylinder 206 and the pressure maintaining transfer device, the core in the pressure maintaining transfer device, i.e. the cut core sample tube 207, is pressure-maintained and transferred to the reaction cylinder 206, the transfer assembly is controlled to block the reaction cylinder 206 and the pressure maintaining transfer device, the pressure-maintained transfer of the core is realized, and the subsequent gas storage assembly, the gas-liquid separation component 402 and the gas-liquid separation component 402 and the flow assembly are vacuumized by the vacuumizing assembly 410, so that the components existing in the subsequent pipelines or mechanisms do not affect the content of the core decomposition product, and the subsequent vacuumization facilitates the extraction of the core decomposition product in the reaction cylinder 206; then the flow pressure in the flow channel is gradually reduced, the pressure in the reaction cylinder 206 is gradually reduced, the hydrate in the core is gradually decomposed, and enters the gas-liquid separation component 402 through the exhaust port 208 and the liquid discharge port 211 for separation, the separated gas enters the gas storage assembly 405 for storage, and the separated liquid enters the liquid storage assembly for storage, so that the key parameters such as the hydrate core gas production and liquid production are quickly obtained, and the decomposition mechanism of the in-situ obtained hydrate core sample is explored.

[0043] In an optional solution of the embodiment, preferably, referring to Figure 3 , the transfer assembly includes a clamp 201 and a ball valve, one end of the ball valve is fixedly connected with the clamp 201 and is in communication, the other end of the ball valve is fixedly connected with the reaction cylinder 206 and is in circumferential sealing; the clamp 201 is used for communicating with the pressure maintaining transfer device, and the ball valve is used for controlling the on-off between the reaction cylinder 206 and the pressure maintaining transfer device; the end of the reaction cylinder 206 away from the transfer assembly is sealingly provided with a cylinder end cover 209, a filter screen 212 is arranged in the reaction cylinder 206 close to the cylinder end cover 209, the exhaust port 208 is arranged on the upper side of the reaction cylinder 206, the liquid discharge port 211 is arranged on the lower side of the reaction cylinder 206, and the filter screen 212 is arranged on the side of the exhaust port 208 and the liquid discharge port 211 close to the transfer assembly.

[0044] Specifically, the hoop 201 is provided with a hoop interface 202 aligned with the pressure-maintaining transfer device and fixed by the hoop 201; the ball valve comprises a ball valve body 203 and a ball valve switch handle 204, and a reaction cylinder 206 is installed on the right side of the ball valve body 203 through a cylinder body pressing ring flange 205, the side wall of the reaction cylinder 206 is provided with through holes for respectively installing an exhaust port 208 and a liquid discharge port 211, the exhaust port 208 is used for discharging gas generated in the hydrate decomposition process, and the liquid discharge port 211 is used for discharging liquid generated in the hydrate decomposition process, and the two are connected to two inlets of the overflow assembly through pipelines; a filter screen 212 is installed at the right side step of the reaction cylinder 206 and fixed through a cylinder body end cover 209, used for filtering mud, sand and other foreign matters carried out in the hydrate decomposition process to prevent the subsequent pipeline from being blocked; the ball valve switch handle 204 is used for closing the ball valve body 203 after the core sample tube 207 is transferred to form a sealed environment, and a first sealing ring 213 is installed at the connection between the reaction cylinder 206 and the ball valve body 203, and an end cover sealing ring 210 is installed at the connection between the reaction cylinder 206 and the cylinder body end cover 209, used for sealing.

[0045] In addition, the reaction cylinder 206 can be used for in-situ decomposition test of hydrate core sample tubes 207 of different sizes and pressure ranges, the diameter of the core sample tube 207 ranges from 0 to 45 mm, the length ranges from 0 to 300 mm, and the pressure ranges from 0 to 35 MPa, wherein the size of the reaction cylinder 206 is greater than that of the core sample tube 207.

[0046] In an optional solution of the embodiment, preferably, as shown in Figure 4 , the temperature control assembly comprises a refrigeration device 301, a coil pipe 303 and a first temperature monitoring component 302, the refrigeration device 301 is arranged on the support assembly 1, and the coil pipe 303 is used for being spirally wound on the outer wall of the reaction cylinder 206; the refrigeration device 301 is in communication with the coil pipe 303, the refrigeration device 301 is used for refrigerating the cooling liquid and circulating the cooling liquid into the coil pipe 303, and the first temperature monitoring component 302 is used for monitoring the temperature information of the cooling liquid in the refrigeration device 301.

[0047] Specifically, the refrigeration device 301 is arranged as an external circulation type refrigeration device for refrigerating the cooling liquid, and the first temperature monitoring component 302 such as a temperature sensor is used for monitoring the temperature of the cooling liquid in real time, a water pump in the refrigeration device 301 pumps out the cooling liquid, the reaction cylinder 206 is cooled through the coil pipe 303, and the temperature in the reaction cylinder 206 is maintained.

[0048] In an optional solution of the embodiment, preferably, as shown in Figure 4The pressure control assembly comprises an overflow valve 304 and a communication valve 305, the overflow valve 304 is used to control the upper limit of the pressure in the reaction cylinder 206, and the inside of the reaction cylinder 206 is used to communicate with the outside through the communication valve 305 and be pressurized or depressurized; specifically, the communication valve 305 is arranged as a ball valve for water injection, pressure and pressure release in the reaction cylinder 206.

[0049] In an optional solution of the embodiment, preferably, referring to Figure 4 The overflow assembly comprises a back pressure valve 310 and an adjusting component, the back pressure valve 310 has an overflow channel and a gas-liquid outlet 312, the back pressure valve 310 communicates with the gas outlet 208 and the liquid outlet 211, and the adjusting component is connected with the back pressure valve 310 and used to regulate the overflow pressure in the overflow channel; the reaction cylinder 206 is provided with a first pressure monitoring component 306 for monitoring the internal pressure, and the gas-liquid outlet 312 of the back pressure valve 310 is provided with a second pressure monitoring component 311 for monitoring the pressure at the gas-liquid outlet 312.

[0050] Specifically, the adjusting component is arranged as a stepper motor 308, the first pressure monitoring component 306 such as a pressure sensor is installed on the cylinder end cover 209 and used to detect the internal pressure of the reaction cylinder 206, the back pressure valve 310 is installed on the first fixed support 307, the first fixed support 307 is installed on the support assembly 1, connected with the stepper motor 308 through the shaft coupling 309, and the second pressure monitoring component 311 such as a pressure sensor is installed on the gas-liquid outlet 312 of the back pressure valve 310, the data acquisition control mechanism 5 can control the rotation angle of the stepper motor 308 through the pressure values fed back by the first pressure monitoring component 306 and the second pressure monitoring component 311, thereby adjusting the opening pressure value of the back pressure valve 310, gradually reducing the internal pressure of the reaction cylinder 206, and the gas-liquid outlet 312 of the back pressure valve 310 is connected to the inlet of the gas-liquid separation component 402 through a pipeline.

[0051] In an optional solution of the embodiment, preferably, referring to Figure 5 The gas-liquid separation component 402 is arranged as a gas-liquid separator, the gas storage assembly 405 is arranged as a gas storage tank, and the vacuum extraction assembly 410 is arranged as a vacuum pump, the gas-liquid separator, the gas storage tank and the vacuum pump are all arranged on the support assembly 1, and the gas storage tank is further provided with a blowdown port 409; the gas storage tank is provided with a second temperature monitoring component 406 and a third pressure monitoring component 407 for monitoring the internal temperature and pressure of the gas storage tank, respectively.

[0052] Specifically, the gas-liquid separation component 402 is installed on the second fixed support 403, after the gas-liquid two-phase flow is separated by the gas-liquid separation component 402, the liquid enters the liquid storage assembly through the liquid outlet 401, and the gas flows into the gas storage tank through the gas outlet 404, the gas storage tank is installed on the third fixed support 408, the tank body of the gas storage tank is installed with the second temperature monitoring component 406 such as a temperature sensor and the third pressure monitoring component 407 and a pressure sensor, for monitoring the temperature and pressure in the gas storage tank in real time; the blowdown port 409 of the gas storage tank is installed at the lower end of the gas storage tank, for discharging the liquid flowing into the gas storage tank, and the gas storage tank is connected to the vacuum pump through the pipeline, for pumping the pipeline and the container of the system to a vacuum state before the reaction.

[0053] In an optional solution of the embodiment, preferably, referring to Figure 5 and Figure 6 , the liquid storage assembly includes a plurality of liquid storage tanks 416 arranged side by side and vertically, each of the liquid storage tanks 416 is arranged on the support assembly 1, the liquid outlet 401 is communicated with each of the liquid storage tanks 416 through an inclined water inlet pipe 415, the communication ports of the plurality of liquid storage tanks 416 and the water inlet pipe 415 gradually increase in height along the fluid flow direction (i.e. from right to left) in the water inlet pipe 415, after the gas-liquid two-phase flow is separated by the gas-liquid separator, the liquid flows into the water inlet pipe 415 through the liquid outlet 401, and the liquid is sequentially introduced into each of the liquid storage tanks 416; each of the liquid storage tanks 416 is provided with a liquid level monitoring component 412 for monitoring the internal liquid level. Figure 6

[0054] Specifically, the liquid storage tank 416 is installed on the fourth fixed support 411, there are four liquid storage tanks 416, the height difference of each of the liquid storage tanks 416 is formed by the height difference gasket 413, and the liquid storage tanks 416 gradually increase from right to left. Figure 6 The liquid storage tank 416 on the right side stores liquid to a certain liquid level, and the subsequent liquid storage tanks 416 are sequentially stored, so as to improve the utilization rate of the liquid storage tank 416; the liquid level monitoring component 412 is a capacitive liquid level sensor, each of the liquid storage tanks 416 is composed of the capacitive liquid level sensor, the upper end cover 414, the tank body and the lower end cover 418, the connection portions of the upper end cover 414 and the lower end cover 418 and the tank body are provided with the second sealing ring 417, and the capacitive liquid level sensor is fixed on the upper end cover 414 through threads, for monitoring the liquid level height in the liquid storage tank 416 in real time.

[0055] In an optional solution of the embodiment, preferably, referring to Figure 2 ​The hydrate core in-situ decomposition test device provided by the embodiment further comprises a walking and lifting assembly 7 arranged on the support assembly 1, which is used to support the walking of the support assembly 1 and can adjust the height of the decomposition mechanism 2 to be connected with the pressure maintaining and transferring device; specifically, the walking and lifting assembly 7 is arranged as six height adjustment form wheels on the lower side of the support assembly 1, and the adjustment range is ±12 mm, which can finely adjust the ground clearance of the decomposition mechanism 2 to be aligned when connected with the pressure maintaining and transferring device.

[0056] In the optional solution of the embodiment, preferably, referring to Figure 7 The hydrate core in-situ decomposition test device provided by the embodiment further comprises a data acquisition control mechanism 5 arranged on the support assembly 1; the data acquisition control mechanism 5 is in communication connection with the first temperature monitoring part 302 and the refrigeration device 301, and is used to receive the cooling liquid temperature information in the refrigeration device 301 and control the action of the refrigeration device 301 to realize the temperature control function; the data acquisition control mechanism 5 is also in communication connection with the first pressure monitoring part 306, the second pressure monitoring part 311 and the adjusting part, and is used to receive the pressure information in the reaction cylinder 206 and the pressure information of the gas-liquid outlet 312 and control the action of the adjusting part to realize the pressure control function; the data acquisition control mechanism 5 is also in communication connection with the second temperature monitoring part 406 and the third pressure monitoring part 407, and is used to receive the temperature and pressure information in the gas storage tank, so as to calculate the total gas production according to the volume, temperature, pressure, gas compression factor and ideal gas constant of the gas storage tank, then through the differentiation of the total gas production with respect to the reaction time, the instantaneous gas production rate is obtained, and the average gas production rate is obtained by dividing the total gas production by the reaction time, so as to realize the gas production and gas production rate measurement function; the data acquisition control mechanism 5 is also in communication connection with each liquid level monitoring part 412, and is used to receive the liquid level information in each liquid storage tank 416, calculate the liquid volume in a single liquid storage tank 416 according to the liquid level value and the inner diameter of the liquid storage tank 416, calculate the total liquid production by superimposing the liquid volumes in the four liquid storage tanks 416 and subtracting the initial liquid volume injected into the system, then through the differentiation of the total liquid production with respect to the reaction time, the instantaneous liquid production rate is obtained, and the average liquid production rate is obtained by dividing the total liquid production by the reaction time, so as to realize the liquid production and liquid production rate measurement function; the data acquisition control mechanism 5 is also in communication connection with the vacuum pumping assembly 410 and is used to control the action of the vacuum pumping assembly 410 to realize the vacuum pumping function; wherein the data acquisition control mechanism 5 can be arranged as a control cabinet.

[0057] The hydrate core in-situ decomposition test device provided by the embodiment further comprises a terminal control mechanism 6 arranged on the support assembly 1, the data acquisition control mechanism 5 is further in communication connection with the terminal control mechanism 6, the terminal control mechanism 6 is used for receiving and displaying the monitoring information of the first pressure monitoring component 306, the second pressure monitoring component 311, the second temperature monitoring component 406, the third pressure monitoring component 407 and the liquid level monitoring component 412 sent by the data acquisition control mechanism 5, and the terminal control mechanism 6 can receive external control instructions and send them to the data acquisition control mechanism 5 to control the actions of the refrigeration device 301, the adjusting component and the vacuum pumping assembly 410; specifically, the terminal control mechanism 6 is arranged as a computer terminal, comprising an upper computer and a PC and a display, the data acquisition control mechanism 5 communicates with the PC and the display through an RS485 communication module, transmits the collected and processed data to the PC, the PC runs the upper computer and displays the data on the display.

[0058] In addition, the display can be arranged as a user display interface, on which data and test review can be performed as required, the current temperature value and the target temperature value of the cooling liquid can be displayed, the start and stop of the refrigeration device 301 can be controlled, the temperature interval can be set, the refrigeration temperature curve can be displayed, the opening or closing or opening and closing degree of the back pressure valve 310 can be controlled, the pressure value of each pressure sensor can be displayed, the start and stop of the vacuum pumping assembly 410 can be controlled, the temperature value of the gas storage tank can be displayed, etc., the liquid level value of the liquid storage tank 416 can be displayed, etc.; in addition, through the control of the pre-set program of the terminal control mechanism 6, the operator can quickly and efficiently complete a large number of in-situ decomposition tests of hydrate core sample tubes.

[0059] In the optional solution of the embodiment, more preferably, referring to Figure 2 , the support assembly 1 comprises aluminum profiles 101, connecting pieces 102, a lower support plate 103, an upper support plate 104, first support blocks 105, a second support block 106 and mounting brackets 107, the support assembly 1 is divided into two layers, the aluminum profiles 101 are fixedly connected through the connecting pieces 102 such as angle steels between the aluminum profiles 101 and between the aluminum profiles 101 and the lower support plate 103 and the upper support plate 104; the upper support plate 104 is provided with two first support blocks 105 and a second support block 106, used for placing the decomposition mechanism 2, the base of the decomposition mechanism 2 is 700 mm away from the ground, and six height adjusting Forma wheels are arranged at the lowermost end of the support assembly 1; the data acquisition control mechanism 5 is arranged on the lower support plate 103, and the terminal control mechanism 6 is arranged on the mounting bracket 107.

[0060] Further, the hydrate core in-situ decomposition test device provided by the embodiment can expand to complete various hydrate test related tests, such as performing a traditional hydrate synthesis and decomposition test, generating different types of hydrates in the reaction cylinder by controlling the synthesis conditions, and then performing a hydrate decomposition test under different conditions, to explore the synthesis and decomposition mechanism of hydrates in the laboratory. The hydrate gas composition analysis experiment can also be performed by connecting an external gas composition analyzer.

[0061] Embodiment two

[0062] The embodiment provides a test method based on the hydrate core in-situ decomposition test device provided in the embodiment one, comprising:

[0063] One end of the transfer assembly is connected to the pressure maintaining transfer device; specifically, the pressure maintaining transfer device and the decomposition mechanism 2 are initially connected, the height of the decomposition mechanism 2 is adjusted by fine-tuning the height of the Fomar wheel, and the coaxiality of the two hoop interfaces 2022 is ensured, and then fixed by the hoop 201;

[0064] The transfer assembly is controlled to block the reaction cylinder 206 and the pressure maintaining transfer device, the overflow assembly is controlled to block the overflow channel, the temperature inside the reaction cylinder 206 is controlled by the temperature control assembly to maintain at a preset temperature, and the reaction cylinder 206 is pressurized to the same pressure as the pressure maintaining transfer device by the pressure control assembly; specifically, the ball valve switch handle 204 is opened, the back pressure valve 310 is controlled to be in a completely closed state by the terminal control mechanism 6, water is filled into the reaction cylinder 206 through the small ball valve, the refrigeration device 301 is started, the refrigeration temperature interval is set, the temperature inside the reaction cylinder 206 is maintained at a preset value, and the internal pressure is pressurized to the same pressure value as the pressure maintaining transfer device;

[0065] The transfer assembly is controlled to connect the reaction cylinder 206 and the pressure maintaining transfer device, so that the core is pressure maintained and transferred into the reaction cylinder 206, the transfer assembly is controlled to block the reaction cylinder 206 and the pressure maintaining transfer device, and the subsequent gas storage assembly, the gas-liquid separation part 402 and the gas-liquid separation part 402 and the overflow assembly are vacuumized by the vacuumizing assembly 410; specifically, the ball valve switch handle 204 is opened, the reaction cylinder 206 and the pressure maintaining transfer device are connected, the cut core sample pipe 207 is pressure maintained and transferred into the reaction cylinder 206 by the pressure maintaining transfer device, the ball valve switch handle 204 is closed, and the vacuum pump is started to vacuumize the subsequent pipeline and container of the back pressure valve 310 to a vacuum state;

[0066] The overcurrent pressure in the overcurrent passage is gradually reduced, and then the pressure in the reaction cylinder 206 is gradually reduced, the hydrate in the core is gradually decomposed, and enters the gas-liquid separation component 402 through the exhaust port 208 and the liquid discharge port 211 for separation, the separated gas enters the gas storage assembly 405 for storage, and the separated liquid enters the liquid storage assembly for storage; specifically, the back pressure valve 310 is opened for pressure reduction by controlling the terminal control mechanism 6, the hydrate in the core sample tube 207 is gradually decomposed, the products are separated by the gas-liquid separation component 402, the gas flows into the gas tank, the liquid flows into the liquid tank 416, and the real-time temperature, pressure and liquid level values are recorded by the temperature sensor and the pressure sensor, so as to carry out subsequent data processing.

[0067] The principles and implementation manners of the present application are described by applying specific examples in the present application, and the above embodiment description is only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In summary, the content of the present application should not be understood as a limitation of the present application.

Claims

1. An in-situ decomposition test apparatus for hydrate cores, characterized in that: include: Support assembly for installation in shipboard laboratories; The decomposition mechanism, mounted on the support assembly, includes a transfer assembly and a reaction cylinder arranged coaxially. The reaction cylinder is provided with an exhaust port and a liquid drain port that communicate with the interior. One end of the transfer assembly is connected to the pressure-holding transfer device, and the other end of the transfer assembly is connected to one end of the reaction cylinder, the other end of the reaction cylinder being sealed. The transfer assembly is used to connect one end of the reaction cylinder to the pressure-holding transfer device so that the core can enter the reaction cylinder from the pressure-holding transfer device, and the transfer assembly is also used to block one end of the reaction cylinder from the pressure-holding transfer device. The transfer assembly includes a clamp and a ball valve. One end of the ball valve is fixedly connected to and communicates with the clamp, and the other end of the ball valve is fixedly connected to and circumferentially sealed with the reaction cylinder. The clamp is used to communicate with the pressure-holding transfer device, and the ball valve is used to control the connection and disconnection between the reaction cylinder and the pressure-holding transfer device. A temperature and pressure control mechanism, mounted on the support assembly, includes a temperature control component, a pressure control component, and a flow control component. The temperature control component controls the temperature inside the reaction chamber. The pressure control component communicates with the interior of the reaction chamber and regulates the internal pressure. The flow control component has a flow channel that communicates with both the exhaust port and the liquid outlet. The flow control component also has a gas-liquid outlet communicating with the flow channel. The flow control component allows gas discharged from the exhaust port and liquid discharged from the liquid outlet to enter the flow channel and exit through the gas-liquid outlet. Furthermore, the flow control component can regulate the flow pressure within the flow channel. The flow control component includes a back pressure valve and a regulating component. The back pressure valve has the flow channel and the gas-liquid outlet, and is communicated with both the exhaust port and the liquid outlet. The regulating component is connected to the back pressure valve and regulates the flow pressure within the flow channel. and A gas-liquid separation processing mechanism, disposed on the support assembly, includes a gas-liquid separation component, a gas storage component, a liquid storage component, and a vacuuming component. The gas-liquid separation component is connected to the gas-liquid outlet and has a gas outlet and a liquid outlet respectively connected to the gas storage component and the liquid storage component. The vacuuming component is connected to the gas storage component and is used to create a vacuum between the gas storage component, the gas-liquid separation component, and the flow-through component.

2. The in-situ decomposition test apparatus for hydrate cores according to claim 1, characterized in that: The reaction cylinder is sealed with a cylinder end cap at the end opposite to the transfer assembly. A filter screen is provided inside the reaction cylinder near the cylinder end cap. The exhaust port is located on the upper side of the reaction cylinder, and the liquid discharge port is located on the lower side of the reaction cylinder. The filter screen is located on the side of the exhaust port and the liquid discharge port near the transfer assembly.

3. The in-situ decomposition test apparatus for hydrate cores according to claim 1, characterized in that: The temperature control assembly includes a refrigeration device, a coil, and a first temperature monitoring component. The refrigeration device is mounted on the support assembly, and the coil is used to spirally wind around the outer wall of the reaction vessel. The refrigeration device is connected to the coil and is used to cool the coolant and circulate the coolant into the coil. The first temperature monitoring component is used to monitor the temperature information of the coolant in the refrigeration device.

4. The in-situ decomposition test apparatus for hydrate cores according to claim 1, characterized in that: The pressure control assembly includes an overflow valve and a connecting valve connected inside the reaction chamber. The overflow valve is used to control the upper pressure limit inside the reaction chamber, and the inside of the reaction chamber is used to connect with the outside world through the connecting valve to pressurize or depressurize.

5. The in-situ decomposition test apparatus for hydrate cores according to claim 3, characterized in that: The reaction cylinder is equipped with a first pressure monitoring component for monitoring the internal pressure, and the gas-liquid outlet of the back pressure valve is equipped with a second pressure monitoring component for monitoring the pressure at the gas-liquid outlet.

6. The in-situ decomposition test apparatus for hydrate cores according to claim 5, characterized in that: The gas-liquid separation component is configured as a gas-liquid separator, the gas storage component is configured as a gas storage tank, and the vacuum pump is configured as a vacuum pump. The gas-liquid separator, the gas storage tank, and the vacuum pump are all mounted on the support assembly, and a drain port is also provided at the bottom of the gas storage tank. The gas storage tank is equipped with a second temperature monitoring component and a third pressure monitoring component, which are used to monitor the internal temperature and pressure of the gas storage tank, respectively.

7. The in-situ decomposition test apparatus for hydrate cores according to claim 6, characterized in that: The liquid storage assembly includes multiple parallel and vertically arranged liquid storage tanks, each of which is mounted on the support assembly. The liquid outlet is connected to each of the liquid storage tanks via an inclined water inlet pipe. The height of the connection between the multiple liquid storage tanks and the water inlet pipe gradually increases along the direction of fluid flow in the water inlet pipe. Each of the aforementioned storage tanks is equipped with a liquid level monitoring component for monitoring the internal liquid level.

8. The in-situ decomposition test apparatus for hydrate cores according to claim 7, characterized in that: It also includes a data acquisition and control mechanism and a terminal control mechanism, both of which are mounted on the support assembly. The data acquisition and control mechanism is communicatively connected to the first temperature monitoring component and the refrigeration device, and is used to receive the coolant temperature information in the refrigeration device and control the operation of the refrigeration device. The data acquisition and control mechanism is also communicatively connected to the first pressure monitoring component, the second pressure monitoring component, and the regulating component, and is used to receive the pressure information inside the reaction cylinder and the pressure information at the gas-liquid outlet and control the operation of the regulating component. The data acquisition and control mechanism is also communicatively connected to the second temperature monitoring component and the third pressure monitoring component, and is used to receive the temperature and pressure information inside the gas storage tank. The data acquisition and control mechanism is also communicatively connected to each of the liquid level monitoring components, and is used to receive the liquid level information in each of the liquid storage tanks. The data acquisition and control mechanism is also communicatively connected to the vacuum assembly, and is used to control the operation of the vacuum assembly. The data acquisition and control mechanism is also communicatively connected to the terminal control mechanism. The terminal control mechanism is used to receive and display the monitoring information of the first pressure monitoring component, the second pressure monitoring component, the second temperature monitoring component, the third pressure monitoring component, and the liquid level monitoring component sent by the data acquisition and control mechanism. The terminal control mechanism can also receive external control commands and send them to the data acquisition and control mechanism to control the operation of the refrigeration device, the regulating component, and the vacuum assembly.

9. The in-situ decomposition test apparatus for hydrate cores according to claim 1, characterized in that: It also includes a walking and lifting assembly, which is disposed on the support assembly. The walking and lifting assembly is used to support the movement of the support assembly and can adjust the height of the disassembly mechanism for docking with the pressure holding and transfer device.

10. A method for in-situ decomposition testing of hydrate core samples, characterized in that: Based on the in-situ decomposition test apparatus for hydrate cores as described in any one of claims 1-9, comprising: Connect one end of the transfer component to the pressure-holding transfer device; The transfer assembly is controlled to block the reaction cylinder from the pressure-holding transfer device, the flow-through assembly is controlled to block the flow-through channel, the temperature control assembly controls the internal temperature of the reaction cylinder to be maintained at a preset temperature, and the pressure control assembly pressurizes the internal temperature of the reaction cylinder to the same pressure as that of the pressure-holding transfer device. Control the transfer assembly to connect the reaction cylinder with the pressure-holding transfer device, so that the core is transferred to the reaction cylinder under pressure. Control the transfer assembly to disconnect the reaction cylinder from the pressure-holding transfer device, and use the vacuum assembly to evacuate the gas storage assembly, gas-liquid separation component, and the gas-liquid separation component and the flow assembly. The flow pressure in the flow channel is gradually reduced, thereby gradually reducing the pressure in the reaction cylinder. The hydrates in the core gradually decompose and enter the gas-liquid separation component through the exhaust port and the liquid outlet for separation. The separated gas enters the gas storage component for storage, and the separated liquid enters the liquid storage component for storage.

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