Natural gas hydrate microwave heating simulation shaft and using method thereof

Abstract

The invention relates to the technical field of natural gas hydrate heating, and discloses a natural gas hydrate microwave heating simulation wellbore and a using method thereof, which solve the problem of poor simulation effect, the natural gas hydrate microwave heating simulation wellbore comprises a frame body, a simulation wellbore is fixed at the top of the frame body, and a water tank is arranged at the front end of the simulation wellbore; a gas tank and a methane box are fixed to the rear end of the simulation shaft through pipelines, a stirring pipe is arranged in the simulation shaft, a plurality of stirring rods are arranged outside the stirring pipe, a stabilizing disc is further arranged at the top of the frame body, a low-light generator is arranged at the right end of the stabilizing disc, an antenna is fixed to the right end of a pressure sensor, and a drill rod is fixed to the rear end of the antenna. A drill bit is arranged at the right end of the drill rod; the device generates microwaves through the low-light generator, the microwaves are transmitted to the antenna through the waveguide, the antenna further generates an electromagnetic field to heat the natural gas hydrate in the simulation shaft, gas production decomposition of the natural gas hydrate is promoted, and therefore the simulation effect is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas hydrate heating, and particularly relates to a microwave heating simulation wellbore for natural gas hydrates and a using method thereof. Background Technique

[0002] Natural gas hydrate is a non-stoichiometric clathrate compound formed by natural gas and water under certain low temperature and high pressure conditions, and is also known as "flammable ice". The microwave heating technology of natural gas hydrate (flammable ice) is a newly emerging mining method in recent years. Its core principle is to utilize the electromagnetic interaction between microwaves and the hydrate reservoir, and convert microwave energy into heat energy through dielectric loss and ion conduction, thereby promoting the decomposition of hydrates. In order to better understand the microwave heating method, it is usually necessary to simulate this method.

[0003] However, when the existing simulation devices are in use, methane gas will be discharged into the air, thus wasting resources. At the same time, the existing simulation devices can only simulate one situation during use, resulting in a small scope of use. Therefore, the present invention proposes a microwave heating simulation wellbore for natural gas hydrates and a using method thereof to solve the above problems. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a microwave heating simulation wellbore for natural gas hydrates and a using method thereof, effectively solving the problems raised in the above background technique.

[0005] To achieve the above object, the present invention provides the following technical solution: A microwave heating simulation wellbore for natural gas hydrates, including a frame body, a simulation wellbore is fixed at the top of the frame body, a water tank is arranged at the front end of the simulation wellbore, a radiator is fixed at the left end of the water tank through a pipeline, a filter box is fixed at the left end of the radiator through a pipeline, the rear end of the filter box is fixedly connected to the simulation wellbore through a pipeline, a gas tank is fixed at the rear end of the simulation wellbore through a pipeline, a methane tank is arranged at the left end of the gas tank, a sealing pipe is fixed at the right end of the simulation wellbore, a stirring pipe is arranged at the left end of the sealing pipe, an adapter shaft is arranged inside the stirring pipe, a plurality of groups of stirring rods are arranged outside the adapter shaft, a rack is fixed at the bottom of the adapter shaft, the bottom of the rack is meshed with a gear, a stone moving plate is arranged inside the simulation wellbore, a flow dividing plate is slidably connected to the simulation wellbore, a material dividing rack is arranged at the bottom of the flow dividing plate, and the bottom of the material dividing rack is meshed with a material dividing gear. A stabilizing plate is further arranged at the top of the frame body, a proximity rod is fixed at the right end of the stabilizing plate, a low-light generator is fixed at the right end of the proximity rod, a pressure sensor is fixed at the right end of the low-light generator through a waveguide, an antenna is fixed at the right end of the pressure sensor, a drill rod is fixed at the rear end of the proximity rod, and a drill bit is arranged at the right end of the drill rod.

[0006] Preferably, a plurality of support rods are fixed to the bottom of the frame body, a controller is fixed to the top of the frame body, a power supply is fixed to the left end of the controller, a connecting plate is fixed to the bottom of the frame body, a plurality of stone moving rods are fixed to the top of the connecting plate, the telescopic end of each stone moving rod is slidably connected to the frame body, the top of each stone moving rod is fixedly connected to the stone moving plate, a box door is fastened to the top of the simulated wellbore by bolts, a temperature sensor is also fixed to the bottom of the frame body, and a pressure sensor is fixed to the right end of the temperature sensor.

[0007] Preferably, a replacement motor is fixed to the top of the frame body, the replacement motor is rotationally connected to the stabilizing disc, a stabilizing ring is fixed to the right end of the stabilizing disc by a plurality of connecting bars, a positioning ring is slidably connected to the outside of the stabilizing disc and the stabilizing ring, the bottom of the positioning ring is fixedly connected to the frame body, and a locking block is fixed to the inner side of each positioning ring.

[0008] Preferably, a displacement sensor is also fixed to the right end of the stabilizing disc, a camera is fixed to the front end of the displacement sensor, a drill pipe positioning block is fixed to the rear side of the fixed end of the drill pipe, the drill pipe positioning block is slidably connected to the connecting bar outside it, a drill pipe motor is fixed to the right end of the drill pipe, the drill pipe motor is rotationally connected to the drill bit, a close rod positioning block is fixed to the telescopic end of the close rod, the close rod positioning block is slidably connected to the connecting bar in front of it, and a protective pipe is arranged outside the antenna and fixedly connected to the pressure sensor.

[0009] Preferably, a water pump is also fixed to the top of the frame body, the water pump is fixedly connected to the water tank through a pipeline, a water valve is fixed to the rear end of the water pump, a clean water flowmeter is arranged at the rear end of the water valve, a water outlet valve is fixed to the bottom of the front end of the simulated wellbore, a water outlet flowmeter is arranged at the front end of the water outlet valve, the front end of the water outlet valve is fixedly connected to the filter box through a pipeline, a filter plate is slidably connected to the inside of the filter box, a throttle valve is arranged at the left end of the radiator, a secondary flowmeter is arranged at the left end of the throttle valve, and a one-way valve is arranged between the water tank and the radiator.

[0010] Preferably, a gas valve is fixed to the rear end of the simulated wellbore through a pipeline, an air pump is fixed to the rear end of the gas valve through a pipeline, the air pump is fixedly connected to the gas tank through a pipeline, an air outlet valve is also fixed to the rear end of the simulated wellbore, a methane valve is arranged at the right end of the air outlet valve, a methane pump is connected to the front end of the methane valve through a pipeline, the methane pump is fixedly connected to the methane tank, an exhaust valve is also fixed to the front end of the methane tank, an infrared methane sensor is fixed to the front end of the exhaust valve through a pipeline, a methane outlet valve is fixed to the front end of the infrared methane sensor through a pipeline, and the front end of the methane outlet valve is fixedly connected to the simulated wellbore.

[0011] Preferably, a positioning block is fixed at the front end of the simulation wellbore. Two sealing shafts are slidably connected to the positioning block. A sealing spring is arranged outside each sealing shaft. A sealing block is fixed at the top of each sealing shaft. The sealing block is in close fit with the material distribution rack. A positioning strip is also fixed at the front end of the simulation wellbore. The positioning strip is rotatably connected to the material distribution gear inside it. A material distribution motor is fixed at the left end of the positioning strip. The material distribution motor is rotatably connected to the material distribution gear. A sealing groove is also arranged on the simulation wellbore. The flow dividing plate is slidably connected to the sealing groove. A tangential plate is fixed at the rear end of the flow dividing plate.

[0012] Preferably, a stirring motor is arranged at the right end of the simulation wellbore and is fixedly connected to the sealing pipe. A moving rod is rotatably connected to the left end of the stirring motor. Two bearings are fixed outside the fixed end of the moving rod. The outer ring of the bearing is fixedly connected to the sealing pipe. A sealing ring is slidably connected to the outside of the telescopic end of the moving rod. A stabilizing plate is fixed outside the sealing ring. The stabilizing plate is slidably connected to the stabilizing groove inside the sealing pipe.

[0013] Preferably, the telescopic end of the sealing pipe is fixedly connected to the stirring pipe. A glass plate is fixed at the left end of the stirring pipe. A protective ring is arranged outside the glass plate and is fixedly connected to the stirring pipe. An internal camera is fixed inside the stirring pipe. A secondary displacement sensor is fixed at the front end of the internal camera. A number of positioning cabins are arranged on the stirring pipe. Two sliding rings are fixed inside the stirring pipe through a connecting block. Each sliding ring is slidably connected to the matching shaft inside it. A number of matching rods are fixed outside the matching shaft. A reversing ring is fixed outside each matching rod. Each reversing ring is rotatably connected to the stirring rod at one end of it. Each stirring rod is rotatably connected to the stirring pipe through a rotating shaft. A stabilizing bar is rotatably connected outside the gear. The stabilizing bar is fixedly connected to the stirring pipe. A motor is fixed at the front end of the stabilizing bar. The motor is rotatably connected to the gear. A connecting disc is fixed at the left end of the matching shaft. A positioning cavity is also arranged inside the simulation wellbore.

[0014] The present invention also provides a usage method of a simulation wellbore for microwave heating of natural gas hydrate. Based on the simulation wellbore for microwave heating of natural gas hydrate as described above, it includes the following steps: Step 1: The staff opens the box door and further places mineral particles on the top of the flow dividing plate. At this time, if it is necessary to simulate the layered state of the core and natural gas hydrate, the controller controls the clear water in the water tank to be conveyed into the simulation wellbore. At this time, the temperature inside the simulation wellbore can be monitored through the temperature sensor. When the water temperature inside the simulation wellbore reaches the required temperature, when the clear water temperature is relatively high, the controller controls the clear water inside the simulation wellbore to flow through the radiator for cooling and then be conveyed back into the simulation wellbore. At this time, the controller controls the methane gas in the methane tank to be conveyed to the bottom of the flow dividing plate according to the required proportion; Step 2: The further controller controls the extension of the moving rod, so that the stirring pipe moves into the interior of the simulated wellbore. The further controller controls the motor to work, so that the adapter shaft moves leftward, so that the long end of the stirring rod rotates to the vertical. At this time, the controller controls the stirring motor to work, so as to stir methane and water. After stirring is completed, the stirring pipe resets. At this time, the controller controls the gas in the gas tank to be transported into the interior of the simulated wellbore, so as to increase the pressure inside the simulated wellbore, so that methane and water form natural gas hydrates; Step 3: The further controller controls the feeding motor to make the feeding gear rotate, so that the diverter plate moves, so that the mineral particles reach the top of the natural gas hydrate, so as to simulate the layering situation. Further pressurization by the gas tank can simulate the underwater environment; Step 4: Further, when it is necessary to simulate the situation of mixing of mineral particles and natural gas hydrates, the controller first controls the mineral particles to fall into the interior of the simulated wellbore. At this time, the controller controls the clear water in the water tank and the methane in the methane tank to enter the interior of the simulated wellbore, and further repeats the stirring and pressurization work to form natural gas hydrates; Step 5: Further, the controller controls the sealing plate to open. At this time, the controller controls the stable plate to rotate, so that the drill bit is aligned with the hole at the left end of the simulated wellbore. At this time, the controller controls the drill pipe and the drill pipe motor to cooperate to drill a hole at the lower end of the diverter plate. When the displacement sensor monitors that the drilling size of the drill bit is consistent with the length of the protective pipe, the drilling stops. Further, the controller controls the replacement motor to make the protective pipe parallel to the drilled hole. At this time, the controller controls the close rod to make the protective pipe enter the drilled hole, and the whole device is sealed due to the action of the pressure sensor; Step 6: At this time, the controller controls the micro-light generator to work, so that the waveguide transmits microwaves to the antenna, so that the electromagnetic field generated by the antenna heats the natural gas hydrates in the simulated wellbore, promoting the gas production and decomposition of the natural gas hydrates. At this time, the internal environment of the simulated wellbore can be monitored by the secondary displacement sensor. When the temperature sensor monitors that the temperature inside the simulated wellbore is relatively high, the controller controls the water in the water tank to enter the interior of the frame to cool down. When the pressure sensor monitors that the pressure inside the simulated wellbore is too high, the methane outlet valve, the infrared methane sensor and the exhaust valve open. If the infrared methane sensor detects methane gas, the controller controls the exhaust valve to close, and the methane flows back into the methane tank; Step 7: When the simulation is completed, the controller controls the whole device to reset. Further, the controller controls the stone moving plate to rise, so as to transport the mineral particles to the diverter plate. At this time, due to the movement of the diverter plate, the mineral particles can be transported to the top of the diverter plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This device can transport the clear water inside the water tank to the inside of the simulated wellbore through the cooperation of a water pump and a water valve, thus facilitating the synthesis of natural gas hydrate while cooling the simulated wellbore, ensuring the simulation effect. Further, the water inside the simulated wellbore can be discharged through the water outlet valve and then enter the filter tank. Further, the impurities in the sewage can be filtered through the filter plate. Further, the filtered clear water can be transported to the radiator through the throttle valve to cool the clear water, and then the clear water flows back into the water tank, realizing resource recycling while ensuring the simulation effect, thus saving resources. At the same time, this device can simulate different environments, thus expanding the application range of the entire device; This device can transport the gas inside the gas tank to the inside of the simulated wellbore through an air pump and an air valve, thus changing the internal pressure of the simulated wellbore, simulating the underwater environment while facilitating the generation of natural gas hydrate. The methane pump and the methane valve cooperate to transport the methane gas inside the methane tank to the inside of the simulated wellbore. At the same time, the gas can be discharged through the methane outlet valve. At the same time, the methane concentration in the pipeline can be monitored through the infrared methane sensor. When the methane concentration is low, the exhaust valve opens to discharge the air. When the methane concentration is high, the exhaust valve closes and the methane gas flows back into the methane tank, thus facilitating the next simulation; This device can drive the gear to rotate through the motor, thus driving the gear to move along the rack, driving the adapter shaft to move, driving the adapter rod to move, and driving the stirring rod to rotate, thus facilitating the stirring rod to stir the mixture of clear water and methane. At the same time, the moving rod can be driven to rotate through the stirring motor to ensure the stirring effect. At the same time, the stirring tube can be driven to move by the telescopic movement of the moving rod to ensure the accuracy of stirring, thus improving the mixing efficiency and ensuring the mixing effect. At the same time, the distance between the stirring tube and the left end of the inner wall of the simulated wellbore can be monitored through the internal camera to ensure the accuracy of stirring; This device can drive the distributing gear to rotate along the distributing rack through the distributing motor, thus moving the flow dividing plate to facilitate the transportation of mineral particles. At the same time, the sealing plate can be driven to move through the sealing rod to facilitate the entry of the protective tube. At the same time, the stone moving plate can be driven to rise and fall through the stone moving rod to facilitate the transportation of mineral particles; This device uses a displacement sensor to monitor the distance between the drill bit and the stabilizing plate to judge the drilling depth. When the pressure sensor detects pressure with the simulated wellbore, it is judged that the simulated wellbore is sealed to ensure the sealing effect. The microwave generator generates microwaves and transmits the microwaves to the antenna through the waveguide. Further, the antenna generates an electromagnetic field to heat the natural gas hydrate in the simulated wellbore, promoting the gas production and decomposition of the natural gas hydrate. At the same time, the stabilizing plate is rotated through the replacement motor to realize commutation. Description of the Drawings

[0016] The accompanying drawings are used to provide a further understanding of the present invention and form a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0017] In the accompanying drawings: Figure 1 is a schematic diagram of the whole device; Figure 2 is a top view schematic diagram of the whole device; Figure 3 is a schematic diagram of the right end of the whole device; Figure 4 is a schematic diagram of the rear end of the whole device; Figure 5 is a schematic diagram of the bottom of the whole device; Figure 6 is a schematic diagram of the inside of the filter box of the device; Figure 7 is a schematic diagram of the right end of the stabilizing disk of the device; Figure 8 is a schematic diagram of the rear end of the simulation box of the device; Figure 9 is a schematic diagram of the inside of the simulation box of the device; Figure 10 is a schematic diagram of the bottom of the flow dividing plate of the device; Figure 11 is a schematic diagram of the sealing block of the device; Figure 12 is a sectional view schematic diagram of the simulation box of the device; Figure 13 is a schematic diagram of the inside of the protective tube of the device; Figure 14 is a schematic diagram of the outside of the stirring tube of the device; Figure 15 is a schematic diagram of the inside of the sealing tube of the device; Figure 16 is a schematic diagram of the stabilizing plate of the device; Figure 17 is a schematic diagram of the inside of the stirring tube of the device; Figure 18 is a schematic diagram of the left end of the inside of the stirring tube of the device; Figure 19 is a schematic diagram of the bottom of the fitting shaft of the device; Figure 20 is a schematic diagram of the stirring rod of the device.

[0018] In the figure: 1 - frame; 2 - gas tank; 3 - sealing pipe; 4 - water tank; 5 - simulated wellbore; 6 - drill pipe; 7 - replacement motor; 8 - proximity rod; 9 - stirring pipe; 101 - controller; 102 - power supply; 103 - support rod; 104 - connecting plate; 105 - stone moving rod; 106 - stone moving plate; 107 - temperature sensor; 108 - air pressure sensor; 201 - methane tank; 202 - air pump; 203 - air valve; 204 - outlet valve; 205 - methane outlet valve; 206 - infrared methane sensor; 207 - exhaust valve; 208 - methane valve; 209 - methane pump; 301 - stirring motor; 302 - moving rod; 303 - bearing; 304 - stabilizing plate; 305 - stabilizing groove; 306 - sealing ring; 401 - radiator; 402 - filter box; 403 - check valve; 404 - throttle valve; 405 - auxiliary flowmeter; 406 - water pump; 407 - water valve; 408 - clean water flowmeter; 409 - outlet water valve; 410 - outlet water flowmeter; 411 - filter plate; 501 - box door; 502 - diverter plate; 503 - sealing rod; 504 - sealing plate; 505 - positioning groove; 506 - sealing groove; 507 - tangential plate; 508 - feeding rack; 509 - feeding gear; 510 - feeding motor; 511 - positioning bar; 512 - sealing block; 513 - sealing shaft; 514 - sealing spring; 515 - positioning block; 601 - drill pipe positioning block; 602 - drill pipe motor; 603 - drill bit; 701 - stabilizing disc; 702 - positioning ring; 703 - locking block; 704 - connecting bar; 705 - stabilizing ring; 706 - displacement sensor; 707 - camera; 801 - low - light generator; 802 - waveguide; 803 - pressure sensor; 804 - protective pipe; 805 - proximity rod positioning block; 806 - antenna; 901 - stirring rod; 902 - glass plate; 903 - protective ring; 904 - positioning cabin; 905 - commutation ring; 906 - positioning cavity; 907 - adapter rod; 908 - adapter shaft; 909 - connecting block; 910 - slip ring; 911 - connecting disc; 912 - motor; 913 - stabilizing bar; 914 - auxiliary displacement sensor; 915 - internal camera; 916 - gear; 917 - rack. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0020] Embodiment 1, consisting of Figures 1 - 3 , Figure 5 , Figure 8 , Figure 10 ,Figure 12 、 Figures 18 - 19Provided is a microwave heating simulation wellbore for natural gas hydrates of the present invention, including a frame body 1. The frame body 1 is made of alloy material and is used to support the entire device. A simulation wellbore 5 is fixed at the top of the frame body 1. The inner layer of the simulation wellbore 5 is made of microwave-penetrating material, the outer layer is a high-strength metal casing, and the middle layer is filled with carbon fiber reinforced polymer, taking into account both microwave transmission and mechanical support. The simulation wellbore 5 facilitates the simulation of the seabed environment. A water tank 4 is provided at the front end of the simulation wellbore 5, and the water tank 4 is used to hold the required clear water. A radiator 401 is fixed to the left end of the water tank 4 through a pipeline, and the radiator 401 cools the clear water discharged from the simulation wellbore 5. A filter box 402 is fixed to the left end of the radiator 401 through a pipeline, and the filter box 402 is used to filter impurities in the water. The rear end of the filter box 402 is fixedly connected to the simulation wellbore 5 through a pipeline. A gas tank 2 is fixed to the rear end of the simulation wellbore 5 through a pipeline, and the gas tank 2 is used to hold the gas to be pressurized. A methane tank 201 is provided at the left end of the gas tank 2, and the methane tank 201 is used to hold the required methane gas. A sealing pipe 3 is fixed to the right end of the simulation wellbore 5. The sealing pipe 3 is made of alloy material and is used to position the stirring motor 301. A stirring pipe 9 is provided at the left end of the sealing pipe 3. The stirring pipe 9 is made of alloy material and is used to position the stirring rod 901. An adapter shaft 908 is provided inside the stirring pipe 9. The adapter shaft 908 is made of alloy material and is used to position the adapter rod 907. A number of groups of stirring rods 901 are provided outside the adapter shaft 908. The stirring rods 901 are made of alloy material and are used to stir the mixture of clear water and methane. A rack 917 is fixed to the bottom of the adapter shaft 908, and the rack 917 can drive the stirring rod 901 to rotate by moving, so as to facilitate the stirring of the stirring rod 901. The bottom of the rack 917 is meshed with a gear 916, and the gear 916 can drive the rack 917 to rotate. A stone moving plate 106 is provided inside the simulation wellbore 5, and the stone moving plate 106 facilitates the transportation of mineral particles to the shunt plate 502. A shunt plate 502 is slidably connected to the simulation wellbore 5. The shunt plate 502 is made of alloy material and is used to hold mineral particles. A feeding rack 508 is provided at the bottom of the shunt plate 502, and the bottom of the feeding rack 508 is meshed with a feeding gear 509. The feeding gear 509 can drive the shunt plate 502 to move by rotating. A stabilizing disk 701 is also provided at the top of the frame body 1. The stabilizing disk 701 is slidably connected to the frame body 1 and is used to position the drill rod 6 and the proximity rod 8. A proximity rod 8 is fixed to the right end of the stabilizing disk 701. The proximity rod 8 is telescopic, so as to drive the micro-light generator 801 to move. A micro-light generator 801 is fixed to the right end of the proximity rod 8, and the micro-light generator 801 is used to generate microwaves.On the right end of the low-light generator 801, a pressure sensor 803 is fixed through a waveguide 802. When the pressure sensor 803 detects pressure between it and the simulated wellbore 5, it is determined that the simulated wellbore 5 is sealed, thus ensuring the sealing effect. An antenna 806 is fixed to the right end of the pressure sensor 803. The antenna 806 generates an electromagnetic field to heat the natural gas hydrate in the simulated wellbore 5, promoting the gas production and decomposition of the natural gas hydrate. A drill pipe 6 is fixed to the rear end of the proximity rod 8. The drill pipe 6 is telescopic, so that the drill pipe motor 602 can be moved. A drill bit 603 is provided at the right end of the drill pipe 6. The drill bit 603 is used for drilling in the natural gas hydrate. All valves of this device are one-way valves.

[0021] Embodiment 2, based on Embodiment 1, consists of Figure 4 、 Figure 7Given that several support rods 103 are fixed to the bottom of the frame body 1. The support rods 103 are made of alloy materials and are used to support the frame body 1. A controller 101 is fixed to the top of the frame body 1, and the controller 101 is used to control the entire device. A power supply 102 is fixed to the left end of the controller 101, and the power supply 102 provides the required electrical energy for the entire device. A connecting plate 104 is fixed to the bottom of the frame body 1, and the connecting plate 104 is used to fix the stone moving rod 105. Several stone moving rods 105 are fixed to the top of the connecting plate 104. The stone moving rods 105 are telescopic, so as to drive the stone moving plate 106 to lift. The telescopic end of each stone moving rod 105 is slidably connected to the frame body 1, and the top of each stone moving rod 105 is fixedly connected to the stone moving plate 106. A box door 501 is fixedly connected to the top of the simulated wellbore 5 by bolts. The box door 501 can ensure the sealing of the entire device. A temperature sensor 107 is also fixed to the bottom of the frame body 1, and the temperature sensor 107 is used to monitor the internal temperature of the simulated wellbore 5. A pressure sensor 108 is fixed to the right end of the temperature sensor 107, and the pressure sensor 108 is used to monitor the internal pressure of the simulated wellbore 5. A replacement motor 7 is fixed to the top of the frame body 1, and the replacement motor 7 can drive the stable disk 701 to rotate. The replacement motor 7 is rotationally connected to the stable disk 701. A stable ring 705 is fixed to the right end of the stable disk 701 by several connecting bars 704. The connecting bars 704 are made of alloy materials and are used to connect the positioning ring 702 and the stable ring 705. A positioning ring 702 is slidably connected to the outside of the stable disk 701 and the stable ring 705. The positioning ring 702 is made of alloy materials and is used to position the stable disk 701 and the stable ring 705. The bottom of the positioning ring 702 is fixedly connected to the frame body 1. A locking block 703 is fixed to the inner side of each positioning ring 702. The locking block 703 is made of alloy materials, and the locking block 703 ensures that the positioning ring 702 and the stable ring 705 can only rotate. A displacement sensor 706 is also fixed to the right end of the stable disk 701, and the displacement sensor 706 is used to monitor the distance between the drill bit 603 and the stable disk 701, so as to judge the drilling depth. A camera 707 is fixed to the front end of the displacement sensor 706, and the camera 707 is used to monitor the micro-light generator 801 and the drill bit 603. A drill pipe positioning block 601 is fixed to the rear side of the fixed end of the drill pipe 6. The drill pipe positioning block 601 is made of alloy materials, and the drill pipe positioning block 601 can ensure the stability of the drill pipe 6. The drill pipe positioning block 601 is slidably connected to the connecting bar 704 outside it. A drill pipe motor 602 is fixed to the right end of the drill pipe 6, and the drill pipe motor 602 can drive the drill bit 603 to rotate. The drill pipe motor 602 is rotationally connected to the drill bit 603,A positioning block 805 is fixed to the telescopic end of the proximity rod 8. The positioning block 805 of the proximity rod is made of alloy material. The positioning block 805 of the proximity rod is used to position the proximity rod 8, so as to ensure the stability of the movement of the low-light generator 801. The positioning block 805 of the proximity rod is slidably connected to the connecting bar 704 at its front end. A protective tube 804 is arranged outside the antenna 806 and fixedly connected to the pressure sensor 803. The protective tube 804 is made of fiberglass. The protective tube 804 can ensure the decomposition effect of natural gas hydrate while protecting the antenna 806 and allowing low light to pass through; Before using this device, the staff installs the whole device at the required position. At this time, the staff opens the box door 501. Further, the staff places the mineral particles on the top of the flow splitter 502. When the temperature sensor 107 monitors that the temperature of the simulated wellbore 5 is the required temperature, the controller 101 controls the fresh water in the water tank 4 and the methane gas in the methane tank 201 to enter the simulated wellbore 5 in proportion. When the temperature of the fresh water is relatively high, the controller 101 controls the fresh water flowing through the radiator 401 in the simulated wellbore 5 to be cooled and then re-transported into the simulated wellbore 5. If it is necessary to simulate the decomposition of natural gas hydrate by microwave, the controller 101 controls the sealing rod 503 to work, so that the sealing plate 504 rises. At this time, the controller 101 controls the replacement motor 7 to work, so that the stable disk 701 rotates. At this time, the drill pipe 6 rotates to be aligned with the axis of the through hole at the left end of the simulated wellbore 5. At this time, the controller 101 controls the drill pipe 6 and the drill pipe motor 602 to cooperate to drill holes in the mixture at the lower end of the flow splitter 502. When the displacement sensor 706 monitors that the drilling size of the drill bit 603 is consistent with the length of the protective tube 804, the drilling stops. Further, the controller 101 controls the replacement motor 7 to make the protective tube 804 parallel to the drilled hole. At this time, the controller 101 controls the proximity rod 8 to extend so that the protective tube 804 enters the drilled hole, and the whole device is sealed due to the action of the pressure sensor 803. At this time, the controller 101 controls the low-light generator 801 to work, so that the waveguide 802 transmits microwaves to the antenna 806, so that the electromagnetic field generated by the antenna 806 heats the natural gas hydrate in the simulated wellbore 5, promoting the gas production and decomposition of natural gas hydrate. At this time, the internal environment of the simulated wellbore 5 can be monitored by the secondary displacement sensor 914.

[0022] Example 3, on the basis of Example 1, by Figure 6 、 Figure 9 、 Figure 11Given that a water pump 406 is also fixed to the top of the frame body 1. The water pump 406 is fixedly connected to the water tank 4 through pipelines. A water valve 407 is fixed to the rear end of the water pump 406. A clear water flowmeter 408 is provided at the rear end of the water valve 407. The water pump 406 and the water valve 407 cooperate to transport the clear water inside the water tank 4 to the inside of the simulated wellbore 5. At the same time, the clear water flow can be monitored through the clear water flowmeter 408. An outlet valve 409 is fixed to the bottom of the front end of the simulated wellbore 5. The outlet valve 409 can control the outflow of sewage inside the simulated wellbore 5. An outlet flowmeter 410 is provided at the front end of the outlet valve 409. The outlet flowmeter 410 is used to monitor the outlet flow. The front end of the outlet valve 409 is fixedly connected to the filter tank 402 through pipelines. A filter plate 411 is slidably connected inside the filter tank 402. The filter plate 411 is used to filter impurities in the sewage. A throttle valve 404 is provided at the left end of the radiator 401. The throttle valve 404 is used to control the filtered clear water to reach the radiator 401. A secondary flowmeter 405 is provided at the left end of the throttle valve 404. The secondary flowmeter 405 is used to monitor the flow of the filtered clear water. A one-way valve 403 is provided between the water tank 4 and the radiator 401. The one-way valve 403 controls the clear water after heat dissipation by the radiator 401 to flow back into the water tank 4. A gas valve 203 is fixedly connected to the rear end of the simulated wellbore 5 through pipelines. A gas pump 202 is fixedly connected to the rear end of the gas valve 203 through pipelines. The gas pump 202 and the gas valve 203 cooperate to transport the gas inside the gas tank 2 to the inside of the simulated wellbore 5, thereby increasing the internal pressure of the simulated wellbore 5, so as to simulate the underwater environment and facilitate the generation of natural gas hydrates at the same time. The gas pump 202 is fixedly connected to the gas tank 2 through pipelines. An outlet gas valve 204 is also fixed to the rear end of the simulated wellbore 5. The outlet gas valve 204 is used for pressure relief. A methane valve 208 is provided at the right end of the outlet gas valve 204. The front end of the methane valve 208 is connected to a methane pump 209 through pipelines. The methane pump 209 and the methane valve 208 cooperate to transport the methane gas inside the methane tank 201 to the inside of the simulated wellbore 5. The methane pump 209 is fixedly connected to the methane tank 201. An exhaust valve 207 is also fixed to the front end of the methane tank 201. The exhaust valve 207 is used to discharge air. An infrared methane sensor 206 is fixedly connected to the front end of the exhaust valve 207 through pipelines. The infrared methane sensor 206 measures the light intensity attenuation through an infrared light source and a detector to calculate the methane concentration. A methane outlet valve 205 is fixedly connected to the front end of the infrared methane sensor 206 through pipelines. The methane outlet valve 205 is used to control the entry of methane gas into the methane tank 201. The front end of the methane outlet valve 205 is fixedly connected to the simulated wellbore 5. A positioning block 515 is fixed to the front end of the simulated wellbore 5. The positioning block 515 is used to position the sealing shaft 513. Two sealing shafts 513 are slidably connected to the positioning block 515.Outside each of the sealing shafts 513, there is a sealing spring 514. The sealing spring 514 is elastic. The cooperation between the sealing shaft 513 and the sealing spring 514 can make the sealing block 512 closely adhere to the shunt plate 502. At the top of the two sealing shafts 513, there is a sealing block 512 fixed. The sealing block 512 is made of alloy material. The sealing block 512 can ensure the sealing performance of the simulation wellbore 5. The sealing block 512 is in close fit with the feeding rack 508. At the front end of the simulation wellbore 5, there is also a positioning strip 511 fixed. The positioning strip 511 is used to position the feeding gear 509. The positioning strip 511 is rotatably connected to the feeding gear 509 inside it. At the left end of the positioning strip 511, there is a feeding motor 510 fixed. The feeding motor 510 can drive the feeding gear 509 to rotate. The feeding motor 510 is rotatably connected to the feeding gear 509. There is also a sealing groove 506 provided on the simulation wellbore 5. The sealing groove 506 is used to position the shunt plate 502. The shunt plate 502 is slidably connected to the sealing groove 506. At the rear end of the shunt plate 502, there is a tangential plate 507 fixed. The tangential plate 507 adopts a slope structure. The tangential plate 507 facilitates the conveying of mineral particles to the top of the shunt plate 502; When the temperature sensor 107 detects a relatively high temperature inside the simulated wellbore 5, the controller 101 controls the cooperation of the water pump 406 and the water valve 407 to deliver the fresh water inside the water tank 4 into the simulated wellbore 5 to cool it down. When the pressure sensor 108 detects an excessive pressure inside the simulated wellbore 5, the methane outlet valve 205, the infrared methane sensor 206, and the exhaust valve 207 are opened to allow air to be discharged. If the infrared methane sensor 206 detects methane gas, the controller 101 controls the exhaust valve 207 to close, and the methane flows back into the methane tank 201. At the same time, when the secondary displacement sensor 914 detects a high water level, the controller 101 controls the water outlet valve 409 to open, and at this time, the sewage enters the filter tank 402. Further, due to the function of the filter plate 411, impurities in the sewage can be filtered. The further filtered fresh water is delivered to the radiator 401 through the throttle valve 404, and after being further cooled by the radiator 401, it flows back into the water tank 4. Further, if it is necessary to simulate the situation of mixing mineral particles with natural gas hydrate, the controller 101 first controls the mineral particles to fall into the simulated wellbore 5. At this time, the controller 101 controls the fresh water inside the water tank 4 and the methane inside the methane tank 201 to enter the simulated wellbore 5, and further repeats the stirring and pressurization work to form natural gas hydrate. When the simulation is completed, the controller 101 controls the entire device to reset. Further, the controller 101 controls the stone moving plate 106 to rise to convey the mineral particles to the diverter plate 502. At this time, due to the movement of the diverter plate 502, the mineral particles can be conveyed to the top of the diverter plate 502.

[0023] Example 4, based on Example 1, by Figures 13 - 17 、 Figure 20Given that a stirring motor 301 is provided at the right end of the simulation wellbore 5 and is fixedly connected to the sealing pipe 3. The stirring motor 301 can drive the moving rod 302 to rotate. The left end of the stirring motor 301 is rotatably connected to the moving rod 302. Two bearings 303 are fixed outside the fixed end of the moving rod 302. The bearings 303 are used to position the moving rod 302. The outer ring of the bearings 303 is fixedly connected to the sealing pipe 3. A sealing ring 306 is slidably connected to the outside of the telescopic end of the moving rod 302. The sealing ring 306 is made of rubber material to ensure the sealing inside the sealing pipe 3. A stabilizing plate 304 is fixed to the outside of the sealing ring 306. The stabilizing plate 304 is made of alloy material. The stabilizing plate 304 can ensure the stability of the sealing pipe 3. The stabilizing plate 304 is slidably connected to the stabilizing groove 305 inside the sealing pipe 3. The telescopic end of the sealing pipe 3 is fixedly connected to the stirring pipe 9. A glass plate 902 is fixed to the left end of the stirring pipe 9. The glass plate 902 facilitates the observation by the secondary displacement sensor 914. A protective ring 903 is provided outside the glass plate 902 and is fixedly connected to the stirring pipe 9. The protective ring 903 can ensure the safety of the glass plate 902. An internal camera 915 is fixed inside the stirring pipe 9. The internal camera 915 is used to monitor the distance between the stirring pipe 9 and the left end inner wall of the simulation wellbore 5 to ensure the accuracy of stirring. A secondary displacement sensor 914 is fixed to the front end of the internal camera 915. The secondary displacement sensor 914 is used to monitor the internal environment of the simulation wellbore 5. A number of positioning cabins 904 are provided on the stirring pipe 9. The positioning cabins 904 facilitate the close contact between the stirring rod 901 and the stirring pipe 9. Two slip rings 910 are fixed inside the stirring pipe 9 through connection blocks 909. The slip rings 910 are made of alloy material. The slip rings 910 are used to position the fitting shaft 908. Each slip ring 910 is slidably connected to the fitting shaft 908 inside it. A number of fitting rods 907 are fixed to the outside of the fitting shaft 908. The fitting rods 907 are telescopic to facilitate the rotation of the stirring rod 901. A reversing ring 905 is fixed to the outside of each fitting rod 907. The reversing ring 905 is made of alloy material. The reversing ring 905 facilitates the rotation of the stirring rod 901. Each reversing ring 905 is rotatably connected to the stirring rod 901 at one end of it. Each stirring rod 901 is rotatably connected to the stirring pipe 9 through a rotating shaft. A stabilizing bar 913 is rotatably connected to the outside of the gear 916. The stabilizing bar 913 is made of alloy material. The stabilizing bar 913 is used to position the gear 916. The stabilizing bar 913 is fixedly connected to the stirring pipe 9. A motor 912 is fixed to the front end of the stabilizing bar 913. The motor 912 can drive the gear 916 to rotate. The motor 912 is rotatably connected to the gear 916. A connecting disk 911 is fixed to the left end of the fitting shaft 908. The connecting disk 911 is made of alloy material,The connecting plate 911 can prevent the adapting shaft 908 from being separated from the slip ring 910. A positioning cavity 906 is further provided inside the simulated wellbore 5. The positioning cavity 906 facilitates the insertion of the protective ring 903, thereby ensuring that the stone moving plate 106 can be smoothly raised and lowered. Further, the controller 101 controls the moving rod 302 to extend, so that the stirring tube 9 moves to the inside of the simulated wellbore 5. At this time, due to the action of the stabilizing groove 305, the stabilizing plate 304 is sealed with the moving rod 302. At the same time, due to the action of the stabilizing plate 304, the stability of the moving rod 302 is guaranteed. Further, the controller 101 controls the motor 912 to work, so that the gear 916 rotates, thereby driving the rack 917 to move left, thereby causing the adapter rod 907 to move left, from The stirring rod 901 is rotated, so that the long end of the stirring rod 901 is vertical, which facilitates stirring. At this time, the slip ring 910 can ensure the stability of the adapter shaft 908 when moving. The controller 101 further controls the stirring motor 301 to work, thereby stirring methane and water. After the stirring is completed, the stirring tube 9 is reset. At this time, the controller 101 controls the gas inside the gas tank 2 to be transported to the inside of the simulated wellbore 5, thereby increasing the internal pressure of the simulated wellbore 5, so that methane and water form natural gas hydrates.

[0024] A method for using a natural gas hydrate microwave-heated simulated wellbore in this embodiment, based on the natural gas hydrate microwave-heated simulated wellbore described above, includes the following steps: Step 1: The staff opens the box door 501 and further places mineral particles on the top of the diverter plate 502. At this time, if it is necessary to simulate the stratification state of the core and natural gas hydrate, the controller 101 controls the clean water in the water tank 4 to be transported to the inside of the simulated wellbore 5. At this time, the temperature inside the simulated wellbore 5 can be monitored by the temperature sensor 107. When the water temperature inside the simulated wellbore 5 is the required temperature, when the clean water temperature is higher, the controller 101 controls the clean water inside the simulated wellbore 5 to flow through the radiator 401 for cooling and then be transported back to the inside of the simulated wellbore 5. At this time, the controller 101 controls the methane gas inside the methane tank 201 to be transported to the bottom of the diverter plate 502 according to the required proportion; Step 2: The further controller 101 controls the extension of the moving rod 302, so that the stirring pipe 9 moves into the interior of the simulated wellbore 5. The further controller 101 controls the operation of the motor 912, so that the adapter shaft 908 moves to the left, so that the long end of the stirring rod 901 rotates to the vertical. At this time, the controller 101 controls the operation of the stirring motor 301 to stir methane and water. After stirring is completed, the stirring pipe 9 resets. At this time, the controller 101 controls the gas in the gas tank 2 to be transported into the interior of the simulated wellbore 5, so as to increase the pressure inside the simulated wellbore 5, so that methane and water form natural gas hydrates; Step 3: The further controller 101 controls the distribution motor 510 to rotate the distribution gear 509, so that the diverter plate 502 moves, so that the mineral particles reach the top of the natural gas hydrate, so as to simulate the layering situation. Further pressurization through the gas tank 2 can simulate the underwater environment; Step 4: Further, when it is necessary to simulate the mixing of mineral particles and natural gas hydrates, the controller 101 first controls the mineral particles to fall into the interior of the simulated wellbore 5. At this time, the controller 101 controls the fresh water in the water tank 4 and the methane in the methane tank 201 to enter the interior of the simulated wellbore 5, and further repeats the stirring and pressurization operations to form natural gas hydrates; Step 5: Further, the controller 101 controls the opening of the sealing plate 504. At this time, the controller 101 controls the rotation of the stabilizing disk 701, so that the drill bit 603 is aligned with the hole at the left end of the simulated wellbore 5. At this time, the controller 101 controls the cooperation of the drill pipe 6 and the drill pipe motor 602 to drill a hole at the lower end of the diverter plate 502. When the displacement sensor 706 monitors that the drilling size of the drill bit 603 is consistent with the length of the protection pipe 804, the drilling stops. Further, the controller 101 controls the replacement motor 7 to make the protection pipe 804 parallel to the drilled hole. At this time, the controller 101 controls the proximity rod 8 to make the protection pipe 804 enter the drilled hole, and the entire device is sealed due to the action of the pressure sensor 803; Step 6: At this time, the controller 101 controls the operation of the low-light generator 801, so that the waveguide 802 transmits microwaves to the antenna 806, so that the electromagnetic field generated by the antenna 806 heats the natural gas hydrates in the simulated wellbore 5, promoting the gas production and decomposition of the natural gas hydrates. At this time, the internal environment of the simulated wellbore 5 can be monitored through the secondary displacement sensor 914. When the temperature sensor 107 monitors that the temperature inside the simulated wellbore 5 is relatively high, the controller 101 controls the water in the water tank 4 to enter the frame body 1 to cool down. When the pressure sensor 108 monitors that the pressure inside the simulated wellbore 5 is too high, the methane outlet valve 205, the infrared methane sensor 206 and the exhaust valve 207 are opened. If the infrared methane sensor 206 detects methane gas, the controller 101 controls the exhaust valve 207 to close, and the methane flows back into the methane tank 201; Step 7: After the simulation is completed, the controller 101 controls the entire device to reset. Further, the controller 101 controls the stone moving plate 106 to rise, so as to convey the mineral particles to the shunt plate 502. At this time, due to the movement of the shunt plate 502, the mineral particles can be conveyed to the top of the shunt plate 502.

[0025] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0026] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A microwave heating simulation wellbore for natural gas hydrate, characterized in that: It includes a frame body (1), a simulated wellbore (5) is fixed at the top of the frame body (1), a water tank (4) is arranged at the front end of the simulated wellbore (5), a radiator (401) is fixed at the left end of the water tank (4) through a pipeline, a filter box (402) is fixed at the left end of the radiator (401) through a pipeline, the rear end of the filter box (402) is fixedly connected with the simulated wellbore (5) through a pipeline, a gas tank (2) is fixed at the rear end of the simulated wellbore (5) through a pipeline, a methane tank (201) is arranged at the left end of the gas tank (2), a sealing pipe (3) is fixed at the right end of the simulated wellbore (5), a stirring pipe (9) is arranged at the left end of the sealing pipe (3), a fitting shaft (908) is arranged inside the stirring pipe (9), a number of stirring rods (901) are arranged outside the fitting shaft (908), a rack (917) is fixed at the bottom of the fitting shaft (908), the rack (917) is meshed with a gear (916) at the bottom, a stone moving plate (106) is arranged inside the simulated wellbore (5), a flow dividing plate (502) is slidably connected to the simulated wellbore (5), a material dividing rack (508) is arranged at the bottom of the flow dividing plate (502), the material dividing rack (508) is meshed with a material dividing gear (509) at the bottom, a stabilizing plate (701) is further arranged at the top of the frame body (1), a proximity rod (8) is fixed at the right end of the stabilizing plate (701), a low-light generator (801) is fixed at the right end of the proximity rod (8), a pressure sensor (803) is fixed at the right end of the low-light generator (801) through a waveguide (802), an antenna (806) is fixed at the right end of the pressure sensor (803), a drill rod (6) is fixed at the rear end of the proximity rod (8), and a drill bit (603) is arranged at the right end of the drill rod (6).

2. The simulated wellbore for microwave heating of natural gas hydrate according to claim 1, wherein: A number of support rods (103) are fixed at the bottom of the frame body (1), a controller (101) is fixed at the top of the frame body (1), a power supply (102) is fixed at the left end of the controller (101), a connecting plate (104) is fixed at the bottom of the frame body (1), a number of stone moving rods (105) are fixed at the top of the connecting plate (104), the telescopic end of each stone moving rod (105) is slidably connected to the frame body (1), and the top of each stone moving rod (105) is fixedly connected with the stone moving plate (106), a box door (501) is fixedly connected to the top of the simulated wellbore (5) by bolts, a temperature sensor (107) is further fixed at the bottom of the frame body (1), and a barometric pressure sensor (108) is fixed at the right end of the temperature sensor (107).

3. A simulated wellbore for microwave heating of natural gas hydrate according to claim 2, characterized in that: A replacement motor (7) is fixed to the top of the frame body (1). The replacement motor (7) is rotationally connected to the stabilizing disc (701). A stabilizing ring (705) is fixed to the right end of the stabilizing disc (701) through a plurality of connecting bars (704). A positioning ring (702) is slidably connected to the outside of the stabilizing disc (701) and the stabilizing ring (705). The bottom of the positioning ring (702) is fixedly connected to the frame body (1). A locking block (703) is fixed to the inner side of each positioning ring (702).

4. A simulated wellbore for microwave heating of natural gas hydrates according to claim 3, characterized in that: A displacement sensor (706) is also fixed to the right end of the stabilizing disc (701). A camera (707) is fixed to the front end of the displacement sensor (706). A drill pipe positioning block (601) is fixed to the rear side of the fixed end of the drill pipe (6). The drill pipe positioning block (601) is slidably connected to the connecting bar (704) outside it. A drill pipe motor (602) is fixed to the right end of the drill pipe (6). The drill pipe motor (602) is rotationally connected to the drill bit (603). A close rod positioning block (805) is fixed to the telescopic end of the close rod (8). The close rod positioning block (805) is slidably connected to the connecting bar (704) in front of it. A protective pipe (804) is provided outside the antenna (806) and is fixedly connected to the pressure sensor (803).

5. A simulated wellbore for microwave heating of natural gas hydrate according to claim 3, characterized in that: A water pump (406) is also fixed to the top of the frame body (1). The water pump (406) is fixedly connected to the water tank (4) through a pipeline. A water valve (407) is fixed to the rear end of the water pump (406). A clean water flowmeter (408) is provided at the rear end of the water valve (407). An outlet valve (409) is fixed to the front bottom of the front end of the simulated wellbore (5). An outlet water flowmeter (410) is provided at the front end of the outlet valve (409). The front end of the outlet valve (409) is fixedly connected to the filter tank (402) through a pipeline. A filter plate (411) is slidably connected inside the filter tank (402). A throttle valve (404) is provided at the left end of the radiator (401). A secondary flowmeter (405) is provided at the left end of the throttle valve (404). A one-way valve (403) is provided between the water tank (4) and the radiator (401).

6. A simulated wellbore for microwave heating of natural gas hydrates according to claim 5, characterized in that: The rear end of the simulated wellbore (5) is fixed with a gas valve (203) through a pipeline. The rear end of the gas valve (203) is fixed with a gas pump (202) through a pipeline. The gas pump (202) is fixedly connected to the gas tank (2) through a pipeline. The rear end of the simulated wellbore (5) is also fixed with an air outlet valve (204). A methane valve (208) is provided at the right end of the air outlet valve (204). The front end of the methane valve (208) is connected to a methane pump (209) through a pipeline. The methane pump (209) is fixedly connected to the methane tank (201). An exhaust valve (207) is also fixed at the front end of the methane tank (201). The front end of the exhaust valve (207) is fixed with an infrared methane sensor (206) through a pipeline. The front end of the infrared methane sensor (206) is fixed with a methane outlet valve (205) through a pipeline. The front end of the methane outlet valve (205) is fixedly connected to the simulated wellbore (5).

7. A simulated wellbore for microwave heating of natural gas hydrate according to claim 6, characterized in that: A positioning block (515) is fixed at the front end of the simulated wellbore (5). Two sealing shafts (513) are slidably connected to the positioning block (515). A sealing spring (514) is provided outside each sealing shaft (513). A sealing block (512) is fixed at the top of the two sealing shafts (513). The sealing block (512) is in close contact with the feeding rack (508). A positioning strip (511) is also fixed at the front end of the simulated wellbore (5). The positioning strip (511) is rotatably connected to the feeding gear (509) inside it. A feeding motor (510) is fixed at the left end of the positioning strip (511). The feeding motor (510) is rotatably connected to the feeding gear (509). A sealing groove (506) is also provided on the simulated wellbore (5). The flow dividing plate (502) is slidably connected to the sealing groove (506). A tangential plate (507) is fixed at the rear end of the flow dividing plate (502).

8. A simulated wellbore for microwave heating of natural gas hydrate according to claim 7, characterized in that: A stirring motor (301) is provided at the right end of the simulated wellbore (5) and is fixedly connected to the sealing pipe (3). A moving rod (302) is rotatably connected to the left end of the stirring motor (301). Two bearings (303) are fixed outside the fixed end of the moving rod (302). The outer ring of the bearing (303) is fixedly connected to the sealing pipe (3). A sealing ring (306) is slidably connected to the outside of the telescopic end of the moving rod (302). A stabilizing plate (304) is fixed outside the sealing ring (306). The stabilizing plate (304) is slidably connected to the stabilizing groove (305) inside the sealing pipe (3).

9. A simulated wellbore for microwave heating of natural gas hydrate according to claim 8, characterized in that: The telescopic end of the sealing tube (3) is fixedly connected to the stirring tube (9). A glass plate (902) is fixed to the left end of the stirring tube (9). A protective ring (903) is arranged outside the glass plate (902) and is fixedly connected to the stirring tube (9). An internal camera (915) is fixed inside the stirring tube (9). A secondary displacement sensor (914) is fixed to the front end of the internal camera (915). A number of positioning compartments (904) are arranged on the stirring tube (9). Two slip rings (910) are fixed inside the stirring tube (9) through a connecting block (909). Each slip ring (910) is slidably connected to the matching shaft (908) inside it. A number of matching rods (907) are fixed to the outside of the matching shaft (908). A reversing ring (905) is fixed to the outside of each matching rod (907). Each reversing ring (905) is rotatably connected to the stirring rod (901) at one end of it. Each stirring rod (901) is rotatably connected to the stirring tube (9) through a rotating shaft. A stabilizing bar (913) is rotatably connected to the outside of the gear (916). The stabilizing bar (913) is fixedly connected to the stirring tube (9). A motor (912) is fixed to the front end of the stabilizing bar (913). The motor (912) is rotatably connected to the gear (916). A connecting disc (911) is fixed to the left end of the matching shaft (908). A positioning cavity (906) is further arranged inside the simulated wellbore (5).

10. A method for using a microwave heating simulation wellbore for natural gas hydrates, based on the microwave heating simulation wellbore for natural gas hydrates according to any one of claims 1-9, characterized in that: It includes the following steps: Step 1: The staff opens the box door (501), and further places mineral particles on the top of the shunt plate (502). At this time, if it is necessary to simulate the layered state of the core and natural gas hydrate, the controller (101) controls the clear water inside the water tank (4) to be transported into the simulated wellbore (5). At this time, the temperature inside the simulated wellbore (5) can be monitored through the temperature sensor (107). When the water temperature inside the simulated wellbore (5) reaches the required temperature, when the clear water temperature is relatively high, the controller (101) controls the clear water inside the simulated wellbore (5) to flow through the radiator (401) to cool down and then be transported back into the simulated wellbore (5). At this time, the controller (101) controls the methane gas inside the methane tank (201) to be transported to the bottom of the shunt plate (502) according to the required ratio; Step 2: Further, the controller (101) controls the moving rod (302) to extend, so that the stirring tube (9) moves into the simulated wellbore (5). Further, the controller (101) controls the motor (912) to work, so that the matching shaft (908) moves to the left, so that the long end of the stirring rod (901) rotates to the vertical. At this time, the controller (101) controls the stirring motor (301) to work, so as to stir methane and water. After stirring is completed, the stirring tube (9) resets. At this time, the controller (101) controls the gas inside the gas tank (2) to be transported into the simulated wellbore (5), so as to increase the pressure inside the simulated wellbore (5), so that methane and water form natural gas hydrate; Step 3: The further controller (101) controls the material distribution motor (510) to rotate the material distribution gear (509), so that the diverter plate (502) moves, so that the mineral particles reach the top of the natural gas hydrate, so as to simulate the stratification situation. Further, pressurization through the gas tank (2) can simulate the underwater environment; Step 4: Further, when it is necessary to simulate the mixing of mineral particles and natural gas hydrate, the controller (101) first controls the mineral particles to fall into the internal of the simulated wellbore (5). At this time, the controller (101) controls the fresh water in the water tank (4) and the methane in the methane tank (201) to enter the internal of the simulated wellbore (5), and further repeats the stirring and pressurization work to form natural gas hydrate; Step 5: Further, the controller (101) controls the sealing plate (504) to open. At this time, the controller (101) controls the stable plate (701) to rotate, so that the drill bit (603) is aligned with the hole at the left end of the simulated wellbore (5). At this time, the controller (101) controls the drill pipe (6) and the drill pipe motor (602) to cooperate to drill a hole at the lower end of the diverter plate (502). When the displacement sensor (706) monitors that the drilling size of the drill bit (603) is consistent with the length of the protective pipe (804), the drilling stops. Further, the controller (101) controls the replacement motor (7) to make the protective pipe (804) parallel to the drilled hole. At this time, the controller (101) controls the approaching rod (8) to make the protective pipe (804) enter the drilled hole, and the whole device is sealed due to the action of the pressure sensor (803); Step 6: At this time, the controller (101) controls the micro-light generator (801) to work, so that the waveguide (802) transmits microwaves to the antenna (806), so that the electromagnetic field generated by the antenna (806) heats the natural gas hydrate in the simulated wellbore (5), promoting the gas production and decomposition of the natural gas hydrate. At this time, the internal environment of the simulated wellbore (5) can be monitored by the secondary displacement sensor (914). When the temperature sensor (107) monitors that the internal temperature of the simulated wellbore (5) is relatively high, the controller (101) controls the water in the water tank (4) to enter the internal of the frame body (1) to cool down. When the pressure sensor (108) monitors that the internal pressure of the simulated wellbore (5) is too high, the methane outlet valve (205), the infrared methane sensor (206) and the exhaust valve (207) open. If the infrared methane sensor (206) detects methane gas, the controller (101) controls the exhaust valve (207) to close, and the methane flows back to the internal of the methane tank (201); Step 7: When the simulation is completed, the controller (101) controls the whole device to reset. Further, the controller (101) controls the stone moving plate (106) to rise, so as to convey the mineral particles to the diverter plate (502). At this time, due to the movement of the diverter plate (502), the mineral particles can be conveyed to the top of the diverter plate (502).

Images