An integrated device and method for solid-state mining of hydrates

Abstract

The present invention provides an integrated device and method for solid-state mining of hydrates, belonging to the technical field of natural gas mining. It solves the problems of complex existing solid-state fluidized mining equipment for hydrates and inconvenient movement. It includes an operation ship and a double-roller tunneling machine. On the operation ship, there are successively arranged a power monitoring cabin, a seawater injection system, a separation system, a compression storage system and a crane. At the end of the crane, there are multiple telescopic rods. At the end of the multiple telescopic rods, there is a double-layer string pipe. At the upper end of the double-layer string pipe, there is a string pipe connector, and the string pipe connector is respectively connected to the seawater injection system and the separation system. On the double-layer string pipe, there are successively arranged a sediment separator, a first turbine motor, a crusher, an emergency release joint, a second turbine motor and a deposit drill roll. On the double-roller tunneling machine, there is a diversion turbine motor box, and the diversion turbine motor box and the double-layer string pipe are connected through a pipeline. Each component of the present invention is integrally arranged, with high integration, high efficiency of solid-state fluidized mining, convenient movement, and ecological environmental protection.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas exploitation, and relates to an integrated device for solid-state exploitation of hydrates, in particular to a method for solid-state exploitation of hydrates. Background Art

[0002] Natural gas hydrate, commonly known as flammable ice, is an extremely efficient and clean energy source. In the South China Sea of our country, its resource volume reaches 85 trillion cubic meters, which is more than 2.1 times the national conventional natural gas reserves.

[0003] At present, countries around the world attach great importance to the commercial technology development of flammable ice, and are increasing investment and intensifying research on its commercial development and application technology. In 2017, the solid-state fluidization test production of Southwest Petroleum University was the world's first successful realization of safe and controllable exploitation of muddy silty natural gas hydrates with a resource volume accounting for more than 90% of the world and the greatest development difficulty.

[0004] The natural gas hydrates existing in the marine environment of our country have the characteristics of weak cementation, no dense caprock, and relatively shallow occurrence position. Such a geological environment gives the solid-state fluidization exploitation method a suitable space for display. First, use the mechanical device on the seabed to fragment the reservoir containing natural gas hydrates to make it into hydrate slurry; then transport it to the exploitation platform on the sea level for further processing. During the lifting process of the hydrate slurry, with the change of the external temperature and pressure, the hydrates gradually decompose and the gas can be recovered, thus obtaining natural gas. The core step of the whole process is reservoir fragmentation, which uses the working conditions of the seabed itself to keep the natural gas hydrates basically stable during the fragmentation process. The solid-state fluidization exploitation method can not only keep the hydrates basically stable during the fragmentation process, but also realize the continuous and controllable decomposition of the hydrates during the lifting process, avoid catastrophic production accidents caused by potential large-scale decomposition, and sediment separation and in-situ backfilling can be carried out in the reservoir area at the same time.

[0005] However, the existing solid-state fluidization exploitation equipment is complex, the structural cooperation is cumbersome, and when carrying out solid-state fluidization exploitation, when the equipment walks in the sediment layer and the hydrate bed, the resistance is large, the movement is inconvenient, and the backfilling of the filtered sediment is difficult, which affects the ecological environment.

[0006] After retrieval, as disclosed in a Chinese patent document, a modular solid-fluidized exploitation device for natural gas hydrates [Application No.: 202110867343; Publication No.: CN113417610A]. This exploitation device includes a drill bit module, a jet module, a front movement module, a telescopic module, a rear movement module, a lifting module, and a seawater injection module; the drill bit module, the jet module, the front movement module, the telescopic module, the rear movement module, the lifting module, and the seawater injection module are connected by taper threads; although the telescopic module, the drill bit module, the jet module, the front movement module, and the rear movement module cooperate with each other and can be used to move the device in the natural gas hydrate layer, the exploitation equipment is complex and the movement is inconvenient.

[0007] Based on this, we propose an integrated device and method for solid exploitation of hydrates. Each component is integrated, with high integration, high efficiency in solid-fluidized exploitation, convenient walking, and ecological environmental protection. Summary of the Invention

[0008] The object of the present invention is to address the above problems existing in the prior art and propose an integrated device and method for solid exploitation of hydrates. The technical problem to be solved by this invention is: how to achieve stable walking of this device on the seabed and stable and efficient solid exploitation of hydrates.

[0009] The object of the present invention can be achieved by the following technical solutions:

[0010] An integrated device for solid exploitation of hydrates includes a workboat and a double-roller tunneling machine. A power monitoring cabin, a seawater injection system, a separation system, a compression storage system, and a crane are successively arranged on the workboat. The end of the crane is provided with multiple telescopic rods. The end of the multiple telescopic rods is provided with a double-layer string pipe. The upper end of the double-layer string pipe is provided with a string pipe connector, and the string pipe connector is respectively connected to the seawater injection system and the separation system. A sediment separator, a first turbine motor, a crusher, an emergency release joint, a second turbine motor, and a deposit drill roll are successively arranged on the double-layer string pipe. The double-roller tunneling machine is arranged outside the double-layer string pipe. A guide vane turbine motor box is arranged on the double-roller tunneling machine, and the guide vane turbine motor box and the double-layer string pipe are connected by a pipeline. A baffle is arranged below the double-roller tunneling machine, and the baffle is located behind the deposit drill roll.

[0011] The working principle of the present invention: The lengths of the multiple telescopic rods, the double-layer string pipe, the double-roller tunneling machine, and the deposit drill roll, as well as the diameter of the deposit drill roll (the width of the hydrate deposit swept), are designed according to the depth of the seabed sediment layer and the position of the hydrate deposit. By replacing the corresponding models, the double-roller tunneling machine is consistent with or longer than the depth of the seabed sediment layer and is used to break the seabed sediment layer;

[0012] The seawater injection system injects seawater into a multi-way connector, and then into a double-layer string pipe, successively passing through or entering a sediment separator, a first turbine motor, a crusher, an emergency release joint, and a second turbine motor, and finally spraying on the ore deposit drill roll, cooperating with the ore passage drilled by the ore deposit drill roll to form a vortex, and quickly flushing the hydrate solid fluid into the bottom of the ore deposit drill roll;

[0013] When the seawater passes through the first turbine motor, it drives the first turbine motor to rotate, and the first turbine motor provides power for the crusher; entering the diversion turbine motor box, the diversion turbine motor box drives the double-roller tunneling machine to work;

[0014] When the seawater passes through the second turbine motor, it drives the first turbine motor to rotate, and the first turbine motor provides power for the ore deposit drill roll, breaking the hydrate ore deposit to obtain a hydrate solid fluid;

[0015] The separation system sucks in the hydrate solid fluid under negative pressure, and the hydrate solid fluid successively passes through the inside of the ore deposit drill roll, the second turbine motor, the emergency release joint, the crusher, the first turbine motor, the sediment separator, and the multi-way connector;

[0016] When passing through the crusher, the hydrate solid fluid is further finely crushed to obtain a hydrate fine liquid. The finely crushed sediment is filtered out by the sediment separator and backfilled into the hydrate ore deposit. During the process of the hydrate slurry being lifted, along with the changes in the external temperature and pressure, the hydrate gradually decomposes, and the gas is recovered, thereby obtaining a natural gas mixture, which is collected in the separation system for detailed gas-liquid-solid separation, and finally, the natural gas is stored through the compression storage system.

[0017] The working ship drives this device forward, the double-roller tunneling machine moves forward, quickly breaking the seabed sediment layer, and the sediment is also backfilled into the hydrate ore deposit, facilitating the forward movement of the double-layer string pipe. The sediment can be backfilled into the ore deposit, the ore deposit drill roll moves forward, breaking the hydrate ore deposit to obtain a hydrate solid fluid.

[0018] The string pipe connector includes a feed elbow and a discharge straight pipe. The discharge straight pipe penetrates and extends out of the feed elbow. An external screw pipe is provided at the lower end of the discharge straight pipe, and a mounting flange is provided at the lower end of the feed elbow. A seawater feed hose is connected to the upper end of the feed elbow, and the seawater feed hose is connected to the seawater injection system. A hydrate discharge hose is connected to the upper end of the discharge straight pipe, and the hydrate discharge hose is connected to the separation system.

[0019] With the above structure, the seawater injection system injects seawater into the feed elbow through the seawater feed hose and enters the double-layer string pipe. The separation system extracts the hydrate solid fluid from the double-layer string pipe, sucks it into the separation system through the hydrate discharge hose, conducts detailed gas-liquid-solid separation, and the separated natural gas is collected in the compression storage system for compression storage.

[0020] The double-layer string pipe includes an inner pipe and an outer pipe, which are fixedly connected to each other. A fixed flange is fixed at the upper end of the outer pipe. The double-layer string pipe is divided into two sections. The sediment separator, the first turbine motor, and the crusher are located on the upper-section double-layer string pipe, and the double-roller tunneling machine and the second turbine motor are located on the lower-section double-layer string pipe. An emergency release joint is connected between the two sections of the double-layer string pipe. The inside of the inner pipe is a hydrate discharge channel, and a seawater feed channel is formed between the inner pipe and the outer pipe. An outer screw pipe is screwed to the upper end of the inner pipe, and a sealing gasket is provided between the outer screw pipe and the inner pipe. The fixed flange and the installation flange are fixedly connected. The water inlet end and the water outlet end of the flow guide turbine motor box are respectively connected to the outer pipe through water pipes, and an electric control valve is provided on the water pipe between the water inlet end and the outer pipe.

[0021] With the above structure, seawater enters the seawater feed channel through the outer pipe, flows through the seawater feed channel, and then enters the first turbine motor, the second turbine motor, and the flow guide turbine motor box to provide power. An electric control valve is set to control the flow rate of the seawater entering the flow guide turbine motor box. The flow guide turbine motor box drives the tunneling roller mechanism to work, that is, it also controls the working speed of the tunneling roller mechanism. The hydrate solid fluid is collected through the hydrate discharge channel; when a fault occurs, the emergency release joint can be quickly released to disconnect the flow guide turbine motor box, the double-roller tunneling machine, the second turbine motor, and the ore deposit drill roller to protect each component.

[0022] The sediment separator includes an inner filter pipe and an outer separation pipe. The inner filter pipe is fixed inside the outer separation pipe. Connecting flanges are provided at both the upper and lower ends of the outer separation pipe, and the connecting flanges are connected to the inner pipe. A plurality of filter meshes are provided inside the inner filter pipe. An inlet is provided at the upper part of the outer separation pipe, and the inlet extends into the seawater feed channel. An outlet is provided at the lower part of the outer separation pipe, and the outlet extends out of the outer pipe.

[0023] With the above structure, seawater enters the inside of the outer separation pipe through the seawater feed channel via the inlet, that is, enters the inside of the inner filter pipe, flushes the hydrate solid fluid, and the hydrate solid fluid is filtered through a plurality of filter meshes to wash and filter out impurities such as sediment inside the hydrate solid fluid, and discharges it out of the outer pipe from the outlet.

[0024] The first turbine motor and the second turbine motor have the same structure. The first turbine motor includes an inner through pipe. The upper end of the inner through pipe is rotatably arranged on the inner pipe, and an outer through pipe is rotatably arranged outside the inner through pipe. The outer through pipe is fixed to the outer pipe. An eddy current channel is formed between the outer through pipe and the inner through pipe. The inner through pipe is provided with a first turbine blade and a second turbine blade. A fixed joint is provided at the lower end of the outer through pipe, and the fixed joint is connected to the outer pipe.

[0025] With the above structure, seawater enters the eddy current channel through the seawater feed channel, passes through the first turbine blade and the second turbine blade, drives the inner through pipe to rotate, and the inner through pipe drives the crusher and the ore deposit drill roller to rotate.

[0026] The crusher includes a fixed outer cylinder, the upper and lower ends of the fixed outer cylinder are fixed on the outer tube, a rotating crushing cylinder is arranged inside the fixed outer cylinder, an internal channel and an external channel are arranged inside the rotating crushing cylinder, the internal channel is located inside the external channel, the upper end of the internal channel is fixedly connected to the lower end of the internal through pipe of the first turbine motor, the lower end of the internal channel is rotatably connected to the inner tube, and a plurality of crushing hammers are arranged inside the internal channel.

[0027] With the above structure, the inner tube of the first turbine motor drives the rotating crushing drum to rotate, thereby driving the crushing hammer inside the built-in channel to rotate. The crushing hammer further hammers and crushes the hydrate solid fluid to obtain hydrate crushed liquid, and seawater flows out through the external channel.

[0028] The double-roller tunneling machine includes a mounting frame, which is fixed above the outer tube. Two groups of bearing seats are fixed on the mounting frame. A rotating shaft is rotatably provided on each group of bearing seats. A gear pair is fixed between the two rotating shafts. The gear pair is located inside the guide turbine motor box. One of the rotating shafts is transmission-connected to the guide turbine motor box. Tunneling rollers are fixed on the rotating shafts. Two discharge plates are provided on the mounting frame. The distance between the two discharge plates is smaller than the outermost distance between the two tunneling rollers. The two discharge plates are located at the rear side of the tunneling rollers. A baffle plate is fixed on the lower side of the mounting frame. The baffle plate is a U-shaped plate. A plurality of nozzles are provided on the inner side of the baffle plate. The nozzles are connected to the seawater feed channel through water pipes. The baffle plate is located at the rear side of the ore bed drill roller.

[0029] With the above structure, the guide turbine motor box drives one of the rotating shafts to rotate, and the rotating shaft drives the other rotating shaft to rotate synchronously through the gear pair, thereby driving the two tunneling rollers to rotate synchronously in the opposite directions. The tunneling rollers break the seabed mud layer to form a moving channel, and the mud is discharged from between the two baffles, falls back into the moving channel and backfills into the hydrate deposit. The seawater enters the nozzle through the seawater feed channel through the water pipe. The nozzle is facing the drill roller of the ore bed, and cooperates with the mine channel generated by the crushing to form a vortex, which quickly flushes the broken hydrate solid fluid into the bottom of the drill roller of the ore bed.

[0030] The ore bed drill roller comprises a drill roller body, a connecting joint is fixed on the upper end of the drill roller body, the connecting joint is connected to the lower end of the inner through pipe of the second turbine motor and is fixedly connected, a plurality of spiral groove cutters evenly distributed around the circumference are provided on the drill roller body, the lower end face of the drill roller body is an arc face, a plurality of mounting holes are opened on the drill roller body, drill cutters are provided inside the mounting holes, a through hole is provided in the middle of the drill cutter, a screw hole is provided on the top of the mounting hole, a screw rod is installed on the screw hole, the mounting screw rod passes through the through hole, and an inner through pipe is provided inside the drill roller body and the connecting joint.

[0031] With the above structure, the inner through pipe of the second turbine motor drives the connecting joint, thereby driving the rotation of the drill roll body. The lower end face of the drill roll body is an arc surface that can vertically downwardly break the hydrate deposit. The spiral groove cutter and the drill bit cooperate to break the hydrate deposit. After the drill bit wears out, it can be replaced regularly. At the same time, the rotation of the spiral groove cutter is more likely to form a vortex to convey the hydrate solid fluid downward, and the hydrate solid fluid is conveyed upward through the inner through pipe.

[0032] A method for solid mining of hydrates, comprising the following steps:

[0033] Step 1, exploration and analysis. The workboat explores the hydrate deposit, and detects and analyzes the depth and position of the submarine sediment layer and the hydrate deposit through the power monitoring chamber;

[0034] Step 2, design and selection. According to the depth and position of the submarine sediment layer and the hydrate deposit, design and select the length of the multi-section telescopic rod, the double-layer string pipe, the double-roller tunneling machine and the deposit drill roll, as well as the diameter of the deposit drill roll;

[0035] Step 3, enter the working position. The telescopic end of the multi-section telescopic rod extends, driving the deposit drill roll to move downward. The deposit drill roll breaks the submarine sediment layer and touches the hydrate deposit. At this time, the double-roller tunneling machine is located inside the submarine sediment layer. The workboat drives the deposit drill roll to move forward, and at the same time, the telescopic end of the multi-section telescopic rod continues to extend. The deposit drill roll obliquely downward breaks the hydrate deposit until the deposit drill roll is completely inserted into the hydrate deposit, and then stops the extension of the telescopic end of the multi-section telescopic rod;

[0036] Step 4, carry out the crushing work. The workboat continues to move forward. At the same time, the seawater injection system injects seawater through the seawater feed hose into the feed elbow, and then enters the seawater feed channel formed between the inner pipe and the outer pipe, passes through the sediment separator in turn, enters the vortex channel of the first turbine motor, enters the external channel, passes through the emergency release joint and enters the vortex channel of the second turbine motor. The nozzle is facing the deposit drill roll and cooperates with the mined tunnel formed by the crushing to form a vortex, and quickly flushes the broken hydrate solid fluid into the bottom of the deposit drill roll;

[0037] When the seawater passes through the first turbine motor, it drives the first turbine blade and the second turbine blade of the first turbine motor to rotate, thereby driving the rotation of the inner through pipe, and this inner through pipe drives the rotation of the rotary breaking cylinder;

[0038] Seawater enters the guide vane turbine motor box, which drives one of the rotating shafts to rotate. The rotating shaft drives another rotating shaft to rotate synchronously through a gear pair, thereby driving two tunneling rollers to rotate synchronously in opposite directions. The tunneling rollers break the seabed sediment layer to form a moving channel, facilitating the movement of the double-layer string pipe. The sediment is discharged from between the two baffle plates, falling back into the moving channel and being backfilled into the hydrate deposit. Seawater enters the nozzle through a water pipe via the seawater feed channel. The nozzle is facing the deposit drill roll and cooperates with the ore channel generated by the breaking to form a vortex, quickly flushing the broken hydrate solid fluid into the bottom of the deposit drill roll;

[0039] When seawater passes through the second turbine motor, the first turbine blade and the second turbine blade rotate, thereby driving the inner through pipe to rotate, and then driving the drill roll body to rotate. The lower end face of the drill roll body is an arc surface that can vertically break the hydrate deposit. The spiral groove cutter and the drill bit cooperate to break the hydrate deposit to obtain the hydrate solid fluid;

[0040] Step Five: Carry out the feeding and crushing work. The separation system sucks in the hydrate solid fluid under negative pressure. The hydrate solid fluid is transported upward through the inner through pipe, successively passing through the inside of the inner through pipe of the second turbine motor, the inside of the emergency release joint, the built-in channel of the crusher, and the crushing hammer inside the built-in channel rotates. The crushing hammer further hammers and crushes the hydrate solid fluid to obtain the hydrate fine liquid;

[0041] Step Six: Carry out the feeding and filtering work. The hydrate fine liquid is transported upward, passes through the inside of the inner through pipe of the first turbine motor, and enters the inside of the inner filter pipe. Seawater enters the inside of the outer separator pipe through the water inlet via the seawater feed channel, that is, enters the inside of the inner filter pipe, flushes the hydrate solid fluid, and the hydrate solid fluid is filtered through several filter meshes to wash and filter out impurities such as sediment inside the hydrate solid fluid, obtaining the hydrate slurry. Impurities such as sediment are discharged from the water outlet to the outer pipe, and the sediment can be backfilled into the hydrate deposit;

[0042] Step Seven: Carry out the lifting and collection work. The hydrate slurry continues to be lifted and transported upward. Along with the change of the external temperature and pressure, the hydrate gradually decomposes, thereby obtaining a natural gas mixture, which is collected into the separation system for detailed gas, liquid, and solid separation. Finally, the natural gas passes through the compression storage system to store the natural gas;

[0043] Step Eight: Maintenance and emergency treatment. Regularly maintain and repair the drill bit. After the drill bit wears out, remove the installation screw and replace the drill bit regularly; when a failure occurs, the emergency release joint can be quickly released to disconnect the guide vane turbine motor box, the double-roll tunneling machine, the second turbine motor, and the deposit drill roll to protect each component.

[0044] Compared with the prior art, the integrated device for solid hydrate mining has the following advantages:

[0045] Through the cooperation of a double-layer string pipe, a sediment separator, a first turbine motor, a crusher, an emergency release joint, a diversion turbine motor box, a double-roller tunneling machine, a second turbine motor, a baffle plate and a deposit drill roll, the integrated mining function is realized. Each component has a high matching degree, occupies a small space and has a high integration degree;

[0046] Through the double-roller tunneling machine and the diversion turbine motor box, the seabed sediment layer is quickly broken, which is convenient for the double-layer string pipe to walk. At the same time, the sediment can be backfilled into the hydrate deposit to protect the ecological environment;

[0047] Through the cooperation of the baffle plate, the nozzle and the deposit drill roll, the spiral groove cutter rotates more easily to form a vortex, quickly flushing the hydrate solid fluid into the bottom of the deposit drill roll, which is convenient for the negative pressure to absorb the hydrate solid fluid. The lower end face of the drill roll body is an arc surface, which can vertically break the hydrate deposit;

[0048] Through the cooperation of the crusher and the sediment separator, the crushing and filtration of the hydrate solid fluid are realized, and a natural gas hydrate slurry with higher purity is obtained. At the same time, the filtered sediment can be backfilled into the hydrate deposit to protect the ecological environment;

[0049] Through the cooperation of the workboat, the power monitoring bin, the seawater injection system and the separation system, power is provided, the separation of the natural gas mixture and the compression and storage of natural gas are realized.

[0050] This method for solid-state mining of hydrates has stable power, stable mining and high efficiency. Brief Description of the Drawings

[0051] Figure 1 It is a front view partial sectional structure schematic diagram of the present invention.

[0052] Figure 2 It is a three-dimensional structure schematic diagram of the present invention.

[0053] Figure 3 It is a three-dimensional structure schematic diagram of the string pipe connector in the present invention.

[0054] Figure 4 It is a three-dimensional structure schematic diagram of the double-layer string pipe in the present invention.

[0055] Figure 5 It is a three-dimensional structure schematic diagram of the sediment separator in the present invention.

[0056] Figure 6 It is a three-dimensional structure schematic diagram of the first turbine motor in the present invention.

[0057] Figure 7 It is a three-dimensional structure schematic diagram of the crusher in the present invention.

[0058] Figure 8 It is a three-dimensional structure schematic diagram of the double-roller tunneling machine in the present invention.

[0059] Figure 9 It is a schematic perspective view of the upper side of the ore deposit drilling roll in the present invention.

[0060] Figure 10 It is a schematic perspective view of the lower side of the ore deposit drilling roll in the present invention.

[0061] Figure 11 It is a process flow block diagram of the present invention.

[0062] In the figure, 1. working ship; 2. power monitoring cabin; 3. seawater injection system; 4. separation system; 5. compression storage system; 6. crane; 7. multi-section telescopic rod; 8. string pipe connector; 9. double-layer string pipe; 10. sediment separator; 11. first turbine motor; 12. crusher; 13. emergency release joint; 14. guide vane turbine motor box; 15. double-roll tunneling machine; 16. second turbine motor; 17. baffle plate; 18. ore deposit drilling roll; 19. feed elbow; 20. discharge straight pipe; 21. mounting flange; 22. external screw pipe; 23. connecting flange; 24. internal filter pipe; 25. water inlet; 26. external partition pipe; 27. water outlet; 28. internal through pipe; 29. external through pipe; 30. first turbine blade; 31. second turbine blade; 32. fixed joint; 33. external channel; 34. rotary crushing cylinder; 35. fixed outer cylinder; 36. mounting frame; 37. bearing seat; 38. rotating shaft; 39. discharge plate; 40. tunneling roll; 41. spray head; 42. connecting joint; 43. drilling roll body; 44. spiral groove cutter; 45. mounting hole; 46. drill bit; 47. mounting screw; 48. internal through pipeline; 49. inner pipe; 50. fixed flange; 51. outer pipe. Detailed implementation manners

[0063] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0064] Such as Figures 1-10As shown in the figure, the integrated device and method for solid-state exploitation of hydrates include an operation ship 1 and a double-roller tunneling machine 15. On the operation ship 1, there are successively a power monitoring bin 2, a seawater injection system 3, a separation system 4, a compression storage system 5, and a crane 6. At the end of the crane 6, there are multiple telescopic rods 7. At the end of the multiple telescopic rods 7, there is a double-layer string pipe 9. At the upper end of the double-layer string pipe 9, there is a string pipe connector 8. The string pipe connector 8 is respectively connected to the seawater injection system 3 and the separation system 4. On the double-layer string pipe 9, there are successively a sediment separator 10, a first turbine motor 11, a crusher 12, an emergency release joint 13, a second turbine motor 16, and a deposit drill roll 18. The double-roller tunneling machine 15 is arranged outside the double-layer string pipe 9. On the double-roller tunneling machine 15, there is a diversion turbine motor box 14. The diversion turbine motor box 14 and the double-layer string pipe 9 are connected by a pipeline. At the lower part of the double-roller tunneling machine 15, there is a baffle plate 17, and the baffle plate 17 is located behind the deposit drill roll 18;

[0065] The working principle of the present invention: The lengths of the multiple telescopic rods 7, the double-layer string pipe 9, the double-roller tunneling machine 15, and the deposit drill roll 18, as well as the diameter of the deposit drill roll 11 (the width of the hydrate deposit swept), are designed according to the depth of the seabed sediment layer and the position of the hydrate deposit. Corresponding models are replaced. The double-roller tunneling machine 15 is consistent with or longer than the depth of the seabed sediment layer and is used to break the seabed sediment layer;

[0066] The seawater injection system 3 injects seawater into the multi-way connector 8, and then into the double-layer string pipe 9, successively passing through or entering the sediment separator 10, the first turbine motor 11, the crusher 12, the emergency release joint 13, and the second turbine motor 16, and finally spraying on the deposit drill roll 18, cooperating with the mine tunnel drilled by the deposit drill roll 18 to form a vortex, and quickly flushing the solid hydrate fluid into the bottom of the deposit drill roll 18;

[0067] When the seawater passes through the first turbine motor 11, it drives the first turbine motor 11 to rotate, and the first turbine motor 11 provides power for the crusher 12; it enters the diversion turbine motor box 14, and the diversion turbine motor box 14 drives the double-roller tunneling machine 15 to work;

[0068] When the seawater passes through the second turbine motor 16, it drives the first turbine motor 16 to rotate, and the first turbine motor 16 provides power for the deposit drill roll 18 to break the hydrate deposit and obtain the solid hydrate fluid;

[0069] The separation system 4 sucks in the solid hydrate fluid under negative pressure. The solid hydrate fluid successively passes through the inside of the deposit drill roll 18, the second turbine motor 16, the emergency release joint 13, the crusher 12, the first turbine motor 11, the sediment separator 10, and the multi-way connector 8;

[0070] When passing through the crusher 12, the hydrate solid fluid is further finely crushed to obtain a hydrate fine liquid. The finely crushed sediment is filtered out by the sediment separator 10 and backfilled into the hydrate deposit. During the process of lifting the hydrate slurry, with the change of the external temperature and pressure, the hydrate gradually decomposes, and the gas is recovered, thus obtaining a natural gas mixture, which is collected into the separation system 4 for detailed gas, liquid, and solid separation. Finally, the natural gas is stored through the compression storage system 5;

[0071] The workboat 1 drives the device forward, the double-roller tunneling machine 15 moves forward to quickly crush the seabed sediment layer, and the sediment is also backfilled into the hydrate deposit, facilitating the forward movement of the double-layer string pipe 9. The sediment can be backfilled into the deposit, the deposit drill roll 18 moves forward to crush the hydrate deposit, and a hydrate solid fluid is obtained.

[0072] The string pipe connector 8 includes a feed elbow 19 and a discharge straight pipe 20. The discharge straight pipe 20 passes through and extends out of the feed elbow 19. An external screw pipe 22 is provided at the lower end of the discharge straight pipe 20, and a mounting flange 21 is provided at the lower end of the feed elbow 19. A seawater feed hose is connected to the upper end of the feed elbow 19, and the seawater feed hose is connected to the seawater injection system 3. A hydrate discharge hose is connected to the upper end of the discharge straight pipe 20, and the hydrate discharge hose is connected to the separation system 4;

[0073] The seawater injection system 3 injects seawater through the seawater feed hose into the feed elbow 19 and into the double-layer string pipe 9. The separation system 4 extracts the hydrate solid fluid from the double-layer string pipe 9 and pumps it into the separation system 4 through the hydrate discharge hose for detailed gas, liquid, and solid separation. The separated natural gas is collected in the compression storage system 5 for compression storage.

[0074] The double-layer string pipe 9 includes an inner pipe 49 and an outer pipe 51. The inner pipe 49 and the outer pipe 51 are fixedly connected. A fixed flange 50 is fixed at the upper end of the outer pipe 51. The double-layer string pipe 9 is divided into two sections. The sediment separator 10, the first turbine motor 11, and the crusher 12 are located on the upper section of the double-layer string pipe 9. The double-roller tunneling machine 15 and the second turbine motor 16 are located on the lower section of the double-layer string pipe 9. The emergency release joint 13 is connected between the two sections of the double-layer string pipe 9. The inside of the inner pipe 49 is a hydrate discharge channel, and a seawater feed channel is formed between the inner pipe 49 and the outer pipe 51. The external screw pipe 22 is screwed onto the upper end of the inner pipe 49, and a sealing gasket is provided between the external screw pipe 22 and the inner pipe 49. The fixed flange 50 and the mounting flange 21 are fixedly connected. The water inlet end and the water outlet end of the guide turbine motor box 14 are respectively connected to the outer pipe 51 through water pipes, and an electric control valve is provided on the water pipe between the water inlet end and the outer pipe 51;

[0075] Seawater enters the seawater feed channel through the outer pipe 51, flows through the seawater feed channel, and then enters the first turbine motor 11, the second turbine motor 16, and the guide vane turbine motor box 14 to provide power. An electric control valve is set to control the flow rate of seawater entering the guide vane turbine motor box 14. The guide vane turbine motor box 14 drives the tunneling roller mechanism 15 to work, that is, it also controls the working speed of the tunneling roller mechanism 15. The hydrate solid fluid is collected through the hydrate discharge channel; when a fault occurs, the emergency release joint 13 can be quickly released to disconnect the guide vane turbine motor box 14, the double-roller tunneling machine 15, the second turbine motor 16, and the ore deposit drill roll 18 to protect each component.

[0076] The sediment separator 10 includes an inner filter pipe 24 and an outer separation pipe 26. The inner filter pipe 24 is fixed inside the outer separation pipe 26. Connecting flanges 23 are provided at both the upper and lower ends of the outer separation pipe 26. The connecting flanges 23 are connected to the inner pipe 49. A number of filter meshes are provided inside the inner filter pipe 24. An inlet 25 is provided at the upper part of the outer separation pipe 26. The inlet 25 extends into the seawater feed channel. An outlet 27 is provided at the lower part of the outer separation pipe 26. The outlet 27 extends out of the outer pipe 51.

[0077] Seawater enters the inside of the outer separation pipe 26 through the seawater feed channel via the inlet 25, that is, enters the inside of the inner filter pipe 24, flushes the hydrate solid fluid, and the hydrate solid fluid is filtered through a number of filter meshes. The sediment and other impurities inside the hydrate solid fluid are flushed and filtered out and discharged from the outlet 27 out of the outer pipe 51.

[0078] The structures of the first turbine motor 11 and the second turbine motor 16 are the same. The first turbine motor 11 includes an inner through pipe 28. The upper end of the inner through pipe 28 is rotatably arranged on the inner pipe 49. An outer through pipe 29 is rotatably arranged outside the inner through pipe 28. The outer through pipe 29 is fixed on the outer pipe 51. An eddy current channel is formed between the outer through pipe 29 and the inner through pipe 28. First turbine blades 30 and second turbine blades 31 are provided on the inner through pipe 28. A fixed joint 32 is provided at the lower end of the outer through pipe 29. The fixed joint 32 is connected to the outer pipe 51.

[0079] Seawater enters the eddy current channel through the seawater feed channel, passes through the first turbine blades 30 and the second turbine blades 31, drives the inner through pipe 28 to rotate, and the inner through pipe 28 drives the crusher 12 and the ore deposit drill roll 18 to rotate.

[0080] The crusher 12 includes a fixed outer cylinder 35. The upper and lower ends of the fixed outer cylinder 35 are fixed on the outer pipe 51. A rotating crushing cylinder is provided inside the fixed outer cylinder 35. An internal channel 34 and an external channel 33 are provided inside the rotating crushing cylinder. The internal channel 34 is located inside the external channel 33. The upper end of the internal channel 34 is fixedly connected to the lower end of the inner through pipe 28 of the first turbine motor 11. The lower end of the internal channel 34 is rotatably connected to the inner pipe 49. A number of crushing hammers are provided inside the internal channel 34.

[0081] The inner through pipe 28 of the first turbine motor 11 drives the rotary crushing cylinder to rotate, thereby driving the crushing hammers inside the built-in channel 34 to rotate. The crushing hammers further hammer and crush the hydrate solid fluid to obtain a finely crushed hydrate liquid, and the seawater flows out through the external channel 33.

[0082] The double-roll tunneling machine 15 includes a mounting frame 36, which is fixed above the outer pipe 51. Two sets of bearing seats 37 are fixed on the mounting frame 36. A rotating shaft 38 is rotatably provided on each set of bearing seats 37. A gear pair is fixed between the two rotating shafts 38. The gear pair is located inside the diversion turbine motor box 14. One of the rotating shafts 38 is in transmission connection with the diversion turbine motor box 14. Tunneling rollers 40 are fixed on the rotating shafts. Two discharge plates 39 are provided on the mounting frame 36. The distance between the two discharge plates 39 is less than the outermost distance of the two tunneling rollers 40. The two discharge plates 39 are located at the rear side of the tunneling rollers 40. A baffle plate 17 is fixed on the lower side of the mounting frame 36. The baffle plate 17 is in the shape of a U-shaped plate. A number of spray nozzles 41 are provided inside the baffle plate 17. The spray nozzles 41 are connected to the seawater feed channel through a water pipe. The baffle plate 17 is located at the rear side of the ore deposit drilling roller 18;

[0083] The diversion turbine motor box 14 drives one of the rotating shafts 38 to rotate. The rotating shaft 38 drives the other rotating shaft 38 to rotate synchronously through the gear pair, thereby driving the two tunneling rollers 40 to rotate synchronously and reversely. The tunneling rollers 40 break the seabed sediment layer to form a moving channel. The sediment is discharged from between the two baffle plates 17, falls back into the moving channel and is backfilled into the hydrate ore deposit. The seawater enters the spray nozzles 41 through the water pipe from the seawater feed channel. The spray nozzles 41 are facing the ore deposit drilling roller 18 and cooperate with the mined channel generated by the breaking to form a vortex, quickly flushing the broken hydrate solid fluid into the bottom of the ore deposit drilling roller 18.

[0084] The ore deposit drilling roller 18 includes a roller body 43. A connecting joint 42 is fixed at the upper end of the roller body 43. The connecting joint 42 is fixedly connected to the lower end of the inner through pipe 28 of the second turbine motor 16. A number of helical groove cutters 44 are evenly distributed in a circumferential manner on the roller body 43. The lower end surface of the roller body 43 is an arc surface. A number of mounting holes 45 are provided on the roller body 43. Drill bits 46 are provided inside the mounting holes 45. Through holes are provided in the middle of the drill bits 46. Screw holes are provided at the top inside the mounting holes 45. Screw rods 47 are installed on the screw holes. The installed screw rods 47 penetrate through the through holes. An inner through pipe 48 is provided inside the roller body 43 and the connecting joint 42;

[0085] The inner through pipe 28 of the second turbine motor 16 drives the connecting joint 42, thereby driving the rotation of the drill roll body 43. The lower end surface of the drill roll body 43 is an arc surface that can vertically downwardly break the hydrate deposit. The spiral groove cutter 44 and the drill cutter 46 cooperate to break the hydrate deposit. After the drill cutter 46 is worn, it can be replaced regularly. At the same time, the rotation of the spiral groove cutter 44 is more likely to form a vortex, and the hydrate solid fluid is transported downward. The hydrate solid fluid is transported upward through the inner through pipe 48.

[0086] As Figure 11 shown, the present method for solid mining of hydrates includes the following steps:

[0087] Step 1, exploration and analysis. The operation ship 1 explores the hydrate deposit, and detects and analyzes the depth and position of the seabed sediment layer and the hydrate deposit through the power monitoring bin 2;

[0088] Step 2, design and selection. According to the depth and position of the seabed sediment layer and the hydrate deposit, the lengths of the multi-section telescopic rod 7, the double-layer string pipe 9, the double-roll tunneling machine 15 and the deposit drill roll 18 are designed and selected, as well as the diameter of the deposit drill roll 11;

[0089] Step 3, enter the working position. The telescopic end of the multi-section telescopic rod 7 extends, driving the deposit drill roll 18 to move downward. The deposit drill roll 18 breaks the seabed sediment layer and contacts the hydrate deposit. At this time, the double-roll tunneling machine 15 is located inside the seabed sediment layer. The operation ship 1 drives the deposit drill roll 18 to move forward, and at the same time, the telescopic end of the multi-section telescopic rod 7 continues to extend. The deposit drill roll 18 obliquely downward breaks the hydrate deposit (also to avoid the baffle plate 17 colliding with the hydrate deposit) until the deposit drill roll 18 is completely inserted into the hydrate deposit, and then stops the extension of the telescopic end of the multi-section telescopic rod 7;

[0090] Step 4, carry out the crushing work. The operation ship 1 continues to move forward. At the same time, the seawater injection system 3 injects seawater through the seawater feed hose into the feed elbow 19, and then enters the seawater feed channel formed between the inner pipe 49 and the outer pipe 51, passes through the sediment separator 10 in turn, enters the vortex channel of the first turbine motor 11, enters the external channel 33, passes through the emergency release joint 13 and enters the vortex channel of the second turbine motor 16. The nozzle 41 is facing the deposit drill roll 18 and cooperates with the ore channel generated by the crushing to form a vortex, and quickly flushes the broken hydrate solid fluid into the bottom of the deposit drill roll 18;

[0091] When the seawater passes through the first turbine motor 11, it drives the first turbine blade 30 and the second turbine blade 31 of the first turbine motor 11 to rotate, thereby driving the rotation of the inner through pipe 28, and the inner through pipe 28 drives the rotary crushing cylinder to rotate;

[0092] Seawater enters the flow - guiding turbine motor box 14, which drives one of the rotating shafts 38 to rotate. The rotating shaft 38 drives another rotating shaft 38 to rotate synchronously through a gear pair, thereby driving two tunneling rollers 40 to rotate synchronously in opposite directions. The tunneling rollers 40 break the seabed sediment layer to form a moving channel, facilitating the movement of the double - layer string pipe 9. The sediment is discharged between the two baffle plates 17, falling back into the moving channel and being backfilled into the hydrate deposit. Seawater enters the spray head 41 through a water pipe via the seawater feed channel. The spray head 41 is facing the deposit drill roll 18 and, in cooperation with the mined channel generated by the breaking, forms a vortex, quickly flushing the broken hydrate solid fluid into the bottom of the deposit drill roll 18;

[0093] When seawater passes through the second turbine motor 16, the first turbine blade 30 and the second turbine blade 31 rotate, thereby driving the inner - through pipe 28 to rotate, and then driving the drill roll body 43 to rotate. The lower end face of the drill roll body 43 is an arc surface that can vertically downward break the hydrate deposit. The spiral groove cutter 44 and the drill bit 46 cooperate to break the hydrate deposit to obtain the hydrate solid fluid;

[0094] Step five, perform the feeding and crushing work. The separation system 4 sucks the hydrate solid fluid under negative pressure. The hydrate solid fluid is conveyed upward through the inner - through pipeline 48, successively passing through the inside of the inner - through pipe 28 of the second turbine motor 16, the inside of the emergency release joint 13, the built - in channel 34 of the crusher 12. The crushing hammer inside the built - in channel 34 rotates, and the crushing hammer further hammers and finely crushes the hydrate solid fluid to obtain the hydrate fine liquid;

[0095] Step six, perform the feeding and filtering work. The hydrate fine liquid is conveyed upward, passing through the inside of the inner - through pipe 28 of the first turbine motor 11 and entering the inside of the inner - filter pipe 24. Seawater enters the inside of the outer separation pipe 26 through the seawater feed channel via the water inlet 25, that is, enters the inside of the inner - filter pipe 24, flushes the hydrate solid fluid, and the hydrate solid fluid is filtered through several filter meshes, flushing and filtering out impurities such as sediment inside the hydrate solid fluid to obtain the hydrate slurry. The sediment and other impurities are discharged from the water outlet 27 to the outer pipe 51, and the sediment can be backfilled into the hydrate deposit;

[0096] Step seven, perform the lifting and collecting work. The hydrate slurry continues to be lifted and conveyed upward. Along with the change of the external temperature and pressure, the hydrate gradually decomposes, thereby obtaining a natural gas mixture, which is collected into the separation system 4 for detailed gas - liquid - solid separation. Finally, the natural gas passes through the compression and storage system 5 for storage of the natural gas;

[0097] Step 8: Maintenance and emergency treatment. Regularly maintain and inspect the drill bit 46. After the drill bit 46 is worn, remove the installation screw 47 and replace the drill bit 46 regularly. When a failure occurs, the emergency release joint 13 can be quickly released to disconnect the diversion turbine motor box 14, the double-roller tunneling machine 15, the second turbine motor 16, and the ore deposit drill roll 18 to protect each component.

[0098] In summary, through the cooperation of the double-layer string pipe 9, the sediment separator 10, the first turbine motor 11, the crusher 12, the emergency release joint 13, the diversion turbine motor box 14, the double-roller tunneling machine 15, the second turbine motor 16, the baffle plate 17, and the ore deposit drill roll 18, the integrated mining function is realized. Each component has a high matching degree, occupies a small space, and has a high integration degree.

[0099] Through the double-roller tunneling machine 15 and the diversion turbine motor box 14, the rapid crushing of the seabed sediment layer is realized, which is convenient for the double-layer string pipe 9 to move. At the same time, the sediment can be backfilled into the hydrate ore deposit to protect the ecological environment.

[0100] Through the cooperation of the baffle plate 17, the nozzle 41, and the ore deposit drill roll 18, the spiral groove cutter 44 rotates more easily to form a vortex, quickly flushing the hydrate solid fluid into the bottom of the ore deposit drill roll 18, which is convenient for the negative pressure to absorb the hydrate solid fluid. The lower end face of the drill roll body 43 is an arc surface, which can vertically break the hydrate ore deposit.

[0101] Through the cooperation of the crusher 12 and the sediment separator 10, the crushing and filtration of the hydrate solid fluid are realized, obtaining a natural gas hydrate slurry with higher purity. At the same time, the filtered sediment can be backfilled into the hydrate ore deposit to protect the ecological environment.

[0102] Through the cooperation of the workboat 1, the power monitoring cabin 2, the seawater injection system 3, and the separation system 4, power is provided, the separation of the natural gas mixture, and the compression and storage of natural gas are realized.

[0103] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An integrated device for solid-state mining of hydrates, comprising an operation ship (1) and a double-roller tunneling machine (15), characterized in that, On the working ship (1), there are successively arranged a power monitoring cabin (2), a seawater injection system (3), a separation system (4), a compression storage system (5) and a crane (6). At the end of the crane (6), there are multiple telescopic rods (7). At the end of the multiple telescopic rods (7), there is a double-layer string pipe (9). At the upper end of the double-layer string pipe (9), there is a string pipe connector (8). The string pipe connector (8) is respectively connected to the seawater injection system (3) and the separation system (4). On the double-layer string pipe (9), there are successively arranged a sediment separator (10), a first turbine motor (11), a crusher (12), an emergency release joint (13), a second turbine motor (16) and a deposit drill roll (18). A double-roll tunneling machine (15) is arranged on the outside of the double-layer string pipe (9). There is a diversion turbine motor box (14) on the double-roll tunneling machine (15). The diversion turbine motor box (14) and the double-layer string pipe (9) are connected by a pipeline. There is a baffle plate (17) at the lower part of the double-roll tunneling machine (15). The baffle plate (17) is located at the rear side of the deposit drill roll (18); The string pipe connector (8) includes a feed elbow (19) and a discharge straight pipe (20). The discharge straight pipe (20) penetrates and extends out of the feed elbow (19). At the lower end of the discharge straight pipe (20), there is an external screw pipe (22). At the lower end of the feed elbow (19), there is a mounting flange (21). A seawater feed hose is connected to the upper end of the feed elbow (19). The seawater feed hose is connected to the seawater injection system (3). A hydrate discharge hose is connected to the upper end of the discharge straight pipe (20). The hydrate discharge hose is connected to the separation system (4); The double-layer string pipe (9) includes an inner pipe (49) and an outer pipe (51). The inner pipe (49) and the outer pipe (51) are fixedly connected. At the upper end of the outer pipe (51), there is a fixed flange (50). The double-layer string pipe (9) is divided into two sections. The sediment separator (10), the first turbine motor (11) and the crusher (12) are located on the upper section of the double-layer string pipe (9). The double-roll tunneling machine (15) and the second turbine motor (16) are located on the lower section of the double-layer string pipe (9). The emergency release joint (13) is connected between the two sections of the double-layer string pipe (9). The inside of the inner pipe (49) is a hydrate discharge channel. A seawater feed channel is formed between the inner pipe (49) and the outer pipe (51). The external screw pipe (22) is screwed onto the upper end of the inner pipe (49). There is a gasket between the external screw pipe (22) and the inner pipe (49). The fixed flange (50) and the mounting flange (21) are fixedly connected. The water inlet end and the water outlet end of the diversion turbine motor box (14) are respectively connected to the outer pipe (51) by water pipes. An electric control valve is arranged on the water pipe between the water inlet end and the outer pipe (51); The deposit drill roll (18) includes a drill roll body (43). At the upper end of the drill roll body (43), there is a connection joint (42). An internal through pipeline (48) is arranged inside the drill roll body (43) and the connection joint (42).

2. The integrated device for solid-state exploitation of hydrates according to claim 1, characterized in that, The sediment separator (10) includes an inner filter pipe (24) and an outer partition pipe (26). The inner filter pipe (24) is fixed inside the outer partition pipe (26). Connecting flanges (23) are provided at both the upper and lower ends of the outer partition pipe (26), and the connecting flanges (23) are connected to the inner pipe (49). A number of filter meshes are provided inside the inner filter pipe (24). An inlet (25) is provided at the upper part of the outer partition pipe (26), and the inlet (25) extends into the seawater feeding channel. An outlet (27) is provided at the lower part of the outer partition pipe (26), and the outlet (27) extends out of the outer pipe (51).

3. The integrated device for solid-state mining of hydrates according to claim 2, wherein, The first turbine motor (11) and the second turbine motor (16) have the same structure. The first turbine motor (11) includes an inner through pipe (28). The upper end of the inner through pipe (28) is rotatably arranged on the inner pipe (49). An outer through pipe (29) is rotatably arranged outside the inner through pipe (28), and the outer through pipe (29) is fixed on the outer pipe (51). An eddy current channel is formed between the outer through pipe (29) and the inner through pipe (28). First turbine blades (30) and second turbine blades (31) are provided on the inner through pipe (28). A fixed joint (32) is provided at the lower end of the outer through pipe (29), and the fixed joint (32) is connected to the outer pipe (51).

4. The integrated device for solid-state exploitation of hydrates according to claim 3, characterized in that, The crusher (12) includes a fixed outer cylinder (35). The upper and lower ends of the fixed outer cylinder (35) are fixed on the outer pipe (51). A rotating crushing cylinder is provided inside the fixed outer cylinder (35). An internal channel (34) and an external channel (33) are provided inside the rotating crushing cylinder. The internal channel (34) is located inside the external channel (33). The upper end of the internal channel (34) is fixedly connected to the lower end of the inner through pipe (28) of the first turbine motor (11), and the lower end of the internal channel (34) is rotatably connected to the inner pipe (49). A number of crushing hammers are provided inside the internal channel (34).

5. The integrated device for solid-state exploitation of hydrate according to claim 4, characterized in that, The double-roller tunneling machine (15) includes a mounting frame (36). The mounting frame (36) is fixed above the outer pipe (51). Two sets of bearing seats (37) are fixed on the mounting frame (36). A rotating shaft (38) is rotatably arranged on each set of bearing seats (37). A gear pair is fixed between the two rotating shafts (38), and the gear pair is located inside the guide vane turbine motor box (14). One of the rotating shafts (38) is in transmission connection with the guide vane turbine motor box (14). Tunneling rollers (40) are fixed on the rotating shafts. Two discharge plates (39) are provided on the mounting frame (36). The distance between the two discharge plates (39) is less than the outermost distance between the two tunneling rollers (40). The two discharge plates (39) are located at the rear side of the tunneling rollers (40). A baffle plate (17) is fixed on the lower side of the mounting frame (36). The baffle plate (17) is in a U-shaped plate. A number of spray nozzles (41) are provided inside the baffle plate (17). The spray nozzles (41) are connected to the seawater feeding channel through a water pipe. The baffle plate (17) is located at the rear side of the ore deposit drilling roller (18).

6. The integrated device for solid-state exploitation of hydrates according to claim 5, characterized in that, The connection joint (42) is fixedly connected to the lower end of the inner through pipe (28) of the second turbine motor (16). A number of spiral groove cutters (44) are evenly distributed in a circle on the drill roll body (43). The lower end surface of the drill roll body (43) is an arc surface. A number of mounting holes (45) are formed in the drill roll body (43). Drill bits (46) are arranged inside the mounting holes (45). Through holes are formed in the middle of the drill bits (46). Screw holes are formed at the top inside the mounting holes (45). Mounting screws (47) are screwed into the screw holes. The mounting screws (47) penetrate through the through holes. An inner through pipe (48) is arranged inside the drill roll body (43) and the connection joint (42).

7. A mining method for the integrated hydrate solid mining device according to claim 6, characterized in that, It includes the following steps: Step 1, exploration and analysis. The operation ship (1) explores the hydrate deposit, and detects and analyzes the depth and position of the seabed sediment layer and the hydrate deposit through the power monitoring cabin (2). Step 2, design and selection. According to the depth and position of the seabed sediment layer and the hydrate deposit, design and select the lengths of the multi-section telescopic rod (7), the double-layer string pipe (9), the double-roll tunneling machine (15) and the deposit drill roll (18), as well as the diameter of the deposit drill roll (18). Step 3, enter the working position. The telescopic end of the multi-section telescopic rod (7) extends, driving the deposit drill roll (18) to move downward. The deposit drill roll (18) breaks the seabed sediment layer and touches the hydrate deposit. At this time, the double-roll tunneling machine (15) is located inside the seabed sediment layer. The operation ship (1) drives the deposit drill roll (18) to move forward. At the same time, the telescopic end of the multi-section telescopic rod (7) continues to extend. The deposit drill roll (18) obliquely breaks the hydrate deposit downward, and also avoids the baffle plate (17) colliding with the hydrate deposit until the deposit drill roll (18) is completely inserted into the hydrate deposit, and then stops the extension of the telescopic end of the multi-section telescopic rod (7). Step 4, carry out the crushing work. The operation ship (1) continues to move forward. At the same time, the seawater injection system (3) injects seawater into the feed elbow (19) through the seawater feed hose, and then enters the seawater feed channel formed between the inner pipe (49) and the outer pipe (51), passes through the sediment separator (10) in turn, enters the eddy current channel of the first turbine motor (11), enters the external channel (33), passes through the emergency release joint (13) and enters the eddy current channel of the second turbine motor (16). The nozzle (41) is facing the deposit drill roll (18) and forms an eddy current in cooperation with the ore channel generated by the crushing, quickly flushing the crushed hydrate solid fluid into the bottom of the deposit drill roll (18). When the seawater passes through the first turbine motor (11), it drives the first turbine blade (30) and the second turbine blade (31) of the first turbine motor (11) to rotate, thereby driving the inner through pipe (28) to rotate, and the inner through pipe (28) drives the rotary crushing cylinder to rotate. Seawater enters the guide vane turbine motor box (14), which drives one of the rotating shafts (38) to rotate. The rotating shaft (38) drives another rotating shaft (38) to rotate synchronously through a gear pair, thereby driving the two tunneling rollers (40) to rotate synchronously in opposite directions. The tunneling rollers (40) break the seabed sediment layer to form a moving channel, facilitating the movement of the double-layer string pipe (9). The sediment is discharged between the two baffle plates (17), falling back into the moving channel and backfilling the hydrate deposit. The seawater enters the nozzle (41) through a water pipe via the seawater feed channel. The nozzle (41) is directed at the deposit drill roll (18) and, in cooperation with the ore channel generated by the breaking, forms a vortex to quickly flush the broken hydrate solid fluid into the bottom of the deposit drill roll (18). When the seawater passes through the second turbine motor (16), it drives the first turbine blade (30) and the second turbine blade (31) of the second turbine motor (16) to rotate, thereby driving the inner through pipe (28) to rotate, and thus driving the drill roll body (43) to rotate. The lower end surface of the drill roll body (43) is an arc surface that vertically breaks the hydrate deposit. The spiral groove cutter (44) and the drill bit (46) cooperate to break the hydrate deposit to obtain the hydrate solid fluid. Step Five: Conduct feeding and breaking work. The separation system (4) sucks in the hydrate solid fluid under negative pressure. The hydrate solid fluid is conveyed upward through the inner through pipe (48), successively passing through the inside of the inner through pipe (28) of the second turbine motor (16), the inside of the emergency release joint (13), the built-in channel (34) of the crusher (12), and the rotating breaking hammer inside the built-in channel (34). The breaking hammer further hammers and crushes the hydrate solid fluid to obtain the hydrate fine liquid. Step Six: Conduct feeding and filtering work. The hydrate fine liquid is conveyed upward, passing through the inside of the inner through pipe (28) of the first turbine motor (11) and entering the inside of the inner filter pipe (24). The seawater enters the inside of the outer separation pipe (26) through the seawater feed channel via the water inlet (25), that is, enters the inside of the inner filter pipe (24), flushes the hydrate solid fluid, and the hydrate solid fluid is filtered through several filter meshes to wash and filter out impurities such as sediment inside the hydrate solid fluid, obtaining the hydrate slurry. The sediment and other impurities are discharged from the water outlet (27) to the outer pipe (51), and the sediment is backfilled into the hydrate deposit. Step Seven: Conduct lifting and collection work. The hydrate slurry continues to be lifted and conveyed upward. Along with the changes in the external temperature and pressure, the hydrate gradually decomposes, thereby obtaining a natural gas mixture, which is collected into the separation system (4) for detailed gas, liquid, and solid separation. Finally, the natural gas passes through the compression storage system (5) to store the natural gas. Step Eight: Maintenance and emergency treatment. Regularly maintain and repair the drill bit (46). After the drill bit (46) is worn, remove the installation screw (47) and regularly replace the drill bit (46). When a fault occurs, the emergency release joint (13) quickly releases, disconnecting the guide vane turbine motor box (14), the double-roller tunneling machine (15), the second turbine motor (16), and the deposit drill roll (18) to protect each component.

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