594results about "Mineral mining" patented technology

The invention provides an experimental method and a device thereof for simulating the exploitation of gas hydrates, wherein the method includes: underlying gas hydrates are generated in a reaction kettle which is provided with water-containing porous medium fill areas. In the step, experimental gas is led in from the lower part of the reaction kettle, thereby spreading the gas from bottom to top into the porous medium fill areas to generate hydrates. Then the hydrates generated are decomposed by adopting a voltage drop method, a heat injection method and or a chemical injection method; and thegas produced after decomposition of the hydrates is discharged out of the reaction kettle, thus simulating the process of exploitation of hydrates. In addition, the invention also provides a device specially designed for implementing the experimental method. The method and the device not only can make three-dimensional simulation of generation circumstance of the gas hydrates in marine sedimentsand the gas hydrates symbiotic with underlying free gas, but also can simulate exploitation of the hydrates by combining a single principle with a multi principle, and can realistically simulate the exploitation process of the gas hydrates.

The present invention provides a method and a device for exploiting the submarine natural gas hydrate. The present invention transfers the natural gas hydrate on the submarine surface to a dredge and then to a large-volume container after being ground; a water pump is used to add sea water appropriately into the large-volume container. As the temperature of the sea water keeps about 20 DEG C, the temperature of the sea water makes the mixture of ground hydrate and sandstone fully decomposed in the large-volume container so as to separate the natural gas, water and sandstone. The separated natural gas is drained and then directly connected with a user terminal. The present invention with convenient operation and simple device can conveniently, economically and effectively achieve the exploitation of the submarine natural gas hydrate.

The invention discloses an extraction device for undersea gas hydrate and an extraction method thereof, which is characterized in that the device is directly communicated with undersea (10) gas hydrate layer (9) through a hollow rigid body (2); or the hollow rigid body is communicated with undersea (10) gas hydrate layer (9) through layers of sand and clay (8) or impermeable bed (11); a water pump (4) and a test and supervisory equipment (5) are provided on one side of the hollow rigid body, the water pump is connected with a drain pipe (3) which is above the sea level (7) through a pipe, the test and supervisory system is connected with an image pickup system and a pressure testing system, and a gas collecting pipe (1) is arranged on the top of the inside of the hollow rigid body. The extraction method comprises the following steps: 1) a hollow rigid body is built on the sea separated with water, and the hollow rigid body is communicated with undersea gas hydrate layer; 2) water in the hollow rigid body is drained out via a water pump to lower the water height in the hollow rigid body and reduce the pressure acting on the gas hydrate layer and the gas hydrate is decomposed into gas and water when the pressure acting on the gas hydrate layer is less than the balance pressure; 3) the decomposed gas escapes upward, is discharged through the gas collecting pipe and is collected.

The invention offers a method of exploiting seabed hydrate. It includes the following steps: using at least two well arrays to form a injecting exploiting well array; using horizontal or deflected section to connect with water injection well and gas production well at hydrate layer; transferring carried heat quantity to hydrate to make it decompose; exploiting the decomposed natural gas; separating gas and water; injecting the separated water to deep part geothermal water layer. The invention combines heating and decompression. The invention has the advantages of simple equipment, convenient operation, and environmental protection. It can apply in large scale exploiting seabed hydrate.

The invention discloses a submarine shallow layer natural gas hydrate pilot hole pull-back jet break-up exploitation method and exploitation device, and belongs to the technical field of submarine hydrate exploitation. The exploitation method mainly comprises the following steps that a water insulation pipe is lowered to the position adjacent to a hydrate deposit, turn drilling is conducted in thehydrate deposit by means of mechanical or jet-flow drilling, and a pilot hole with a certain inclined angle is formed; after drilling reaches a preset position, a continuous pipe and an exploitationcrushing system are pulled back, meanwhile the surrounding hydrate ore body is crushed by means of a spray head jet flow, hydrate particles formed are collected into a closed pipeline with seawater, silt in the crushed particles is separated out by means of an in-pipe downhole separator, curing agent is added, then the particles are backfilled to a gob in situ, and the hydrate particles after separation are pumped to the sea surface for treatment together with the seawater. By means of the exploitation method and the exploitation device, efficient, safe and sustainable exploitation of the submarine shallow layer natural gas hydrate is achieved, the exploitation efficiency is ensured, and meanwhile a potential safety problem is effectively avoided.

The single well operation process for exploiting hydrate from sea bottom includes the following steps: drilling one horizontal section in the top of hydrate layer to expand the hydrate layer exposing area; connecting slotted pipe to the end of the horizontal section to increase the passage area of the recirculated medium; forming one circulation with the oil pipe and the annular space and with water as the circulating medium; injecting hot water into oil pipe from the platform and returning hot water to the vertical section to exchange energy with stratum and to decompose the hydrate; backing upwards the mixed liquid through the annular space; adopting sand preventer in the horizontal section to leave sand in the storing layer; and treating the exploited water and reinjetting to underground for reuse and separating from sea water to avoid environmental pollution.

The invention discloses a green mining system of natural gas hydrate. The green mining system is used for mining natural gas hydrate from non-lithified stratums of deep-sea seabed superficial layers. The green mining system comprises a seabed tunneling-fluidifying-lifting pry, a closed fluidifying gathering pipeline and a sea surface separating and processing system, wherein the seabed tunneling-fluidifying-lifting pry is used for excavating a natural gas hydrate reservoir in a solid state in a storage region of the natural gas hydrate by virtue of the temperature and pressure in a natural environment, collecting solid matter of the natural gas hydrate, and crushing the solid matters of the natural gas hydrate into particulate matters, and seawater and the particulate matters are mixed through injection to form gas-liquid-solid multiphase mixture flow; the closed fluidifying gathering pipeline comprises a closed pipeline which is connected with the seabed tunneling-fluidifying-lifting pry so as to lift the gas-liquid-solid multiphase mixture flow to the sea surface; the sea surface separating and processing system is arranged at a sea surface support system and comprises a separating device and a processing device, the separating device is used for separating a gas-liquid-solid multiphase mixture lifted to the sea surface through the closed pipeline, and the processing device is used for processing separated matters. According to the green mining system, the safe and green mining of the deep-sea natural gas hydrate is realized, and potential hazards in multiple aspects are avoided.

Applicants have created a method and system of deep sea mining comprising mining SMS deposits from the sea floor with a subsea miner, pumping the solids from the subsea miner through a jumper and pumping the solids from the jumper up a riser to a surface vessel. Further, applicants have created a method of deploying a deep sea mining system, comprising stacking a riser hangoff structure on top of a subsea pump module forming an assembly; picking up the assembly by a hanging mechanism, hanging the assembly on a moon pool, attaching a first riser joint; disconnecting the riser hangoff structure from the assembly; and attaching at least one second riser joint to form the riser.

The present invention is a multiple purposed system of producing methane from its hydrates and sequestering carbon dioxide into its hydrates. Methane hydrates mixed with mud, prepared with methane mining assembly 23 are brought to sea surface by a series of buckets 16 attaching to rotating chains 18. The decomposed methane is collected into the methane dome 50 and is processed into liquefied natural gas or synthetic liquid fuels. Liquid carbon dioxide is brought down through a tube 70 and a sequestering device 86 into the sea where the pressure and the temperature are adequate for carbon dioxide hydrates to form and settle down to the sea bottom. The unconverted gaseous carbon dioxide is collected into carbon dioxide dome 49 and is liquefied again for recycling. A specially designed marine plantation, comprising of plurality of planting units 352 and a fleet of seeding and harvesting boats, is employed to remove the residual carbon dioxide from the sequestering, to alleviate the global warming, to serves as an abundant source of renewable energy, and as a huge sink for carbon. In addition, it could provide a profusion of less-polluted seafood. The operations of mining methane, sequestering carbon dioxide and marine plantation are fully integrated and optimized

Method and apparatus are disclosed for recovering natural gas from a hydrate deposit near or at the sea floor. A rigid dome structure, supported by a floating vessel and movable along the sea floor, is placed over the hydrate deposit. Heated sea water may be pumped from the floating vessel through headers and nozzles in the rigid dome structure. The heated sea water preferably fluidizes the marine sand containing hydrate, releasing gas in the hydrate. The gas is collected in the rigid dome structure and moved through a pipe to the floating vessel, where it may be processed through a turbo-expander and liquefied.

The present invention discloses a natural gas hydrate one-dimensional production simulation experimental device. It is characterized by that its simulation experimental tube is placed in a temperature control box; the interior of said simulation experimental tube is a sealed simulation cavity. The front end of said simulation experimental tube is communicated with natural gas supply unit and working fluid supply unit by means of control valve, and its rear end is communicated with rear processing unit by means of control valve. In the interior of simulation experimental tube, natural gas supply unit, working fluid supply unit and rear processing unit an induction element is set respectively, and every induction element is electrically connected with data processing unit respectively.

The invention discloses a method and a device for extracting volcanogenic massive sulphide ore deposit on seabed, which comprise the following steps that: (1) a seabed mining vehicle, a seabed conveyor system, a seabed collecting system and a seabed excavating mechanism are placed on the seabed from a new-moon pool in the middle of a surface workboat; (2) the seabed mining vehicle is started to move to an working face, then a cutting head drive device of the excavating mechanism arranged on the seabed mining vehicle is started and controlled to carry out excavation and cutting operation, and under the excavation and cutting action of the cutting head, sulfide ore is crushed and the crushed sulfide ore falls into an ore chute; (3) the collecting system is started to convey the sulfide ore in the ore chute to an intermediate bin; and (4) the conveyor system is started to convey the sulfide ore in the intermediate bin to the surface workboat. The invention also comprises a corresponding device. The method is low in extraction cost, high in efficiency, simple in equipment, convenient in operation, and suitable for large-scale extraction of volcanogenic massive sulfide ore deposit on seabed.

The invention discloses an assembled mining system for deep sea mineral resources. The assembled mining system mainly comprises a mining ship, an underwater nuclear power plant, an intermediate hopper, ocean mining machines, a lifting mine sub-system, integrated navigation systems, a pontoon crane and a pipe-laying ship, wherein the components are respectively paved by different working ships, are assembled undersea, and are disassembled and recovered in the recovery process; the mining ship is connected with the underwater nuclear power plant through a hose section; the underwater nuclear power plant is connected with the intermediate hopper through a vertical pipe section; the intermediate hopper is connected with one or more ocean mining machines through hose sections; and the integrated navigation systems are respectively arranged on the mining ship, the underwater nuclear power plant, the ocean mining machines and the seabed, and are evenly arranged on the hose sections and the vertical pipe section. According to the distributed assembled mining system for deep sea mineral resources with independent and remote control modes for operating, a mining device which is high in safety and low in cost is provided for mining of the deep sea mineral resources.

The invention provides a cutter exploitation method of seabed natural gas hydrates. The method employs a seabed exploitation vehicle, a sea level decomposition and storage system, and a waterpower conveying system for connecting the seabed exploitation vehicle as well as the sea level decomposition and storage system. The seabed exploitation vehicle comprises a reamer, a reamer arm, a crawler type running gear as well as a power and control system, and the like, and is used for cutting and fragmenting the seabed natural gas hydrate. The waterpower conveying system comprises an auxiliary slurry pump, a conveying flexible pipe, a buoyancy ball, a main slurry pump, a conveying hard tube, and the like, and the system is used for conveying the natural gas hydrates which is fragmented by the exploitation vehicle to the sea level decomposition and storage system. The decomposition and storage system comprises a decomposer, a storage container, a mine tailing pipe, and the like, and is used for decomposing and separating the natural gas hydrates which are conveyed by the conveying system and collecting the natural gas hydrates in the storage container, and the separated seabed deposits and other refuses are discharged to the seabed. The cutter exploitation method of seabed natural gas hydrates has high production efficiency and controllable exploitation process, 'air bag' and the like are not needed to construct, and the method has good application prospects.

The invention relates to a method for using original catalyst oxidization thermal chemical method to product natural gas hydrate, and a relative device, wherein said method is characterized in that: pouring hydrate decompose accelerant into the hydrate storage layer to decompose the natural hydrate; using oxidant to catalyze and oxidize the fuel to heat the heat liquid in the catalyst oxidization burner; then pumping the liquid into storage layer to support the heat needed in the decomposition of natural gas hydrate; then pouring the CO₂ gas generated by burning into hydrate storage layer; and the inventive device comprises: catalyze oxidize burner 14, as one coaxial sleeve reactor, while the tube is the catalyze oxidize burning area and the frame is divided into preheating section and heat exchanging section. The invention can combine the mechanical method and the CO₂ exchange method, to improve the producing speed and confirm the stability of seabed.

The invention relates to a system for integrally exploiting marine energy resource, which is characterized in that the system comprises a wave energy power generation module, a traditional oil-gas production module, a marine temperature difference energy power generation module, a tide and ocean current underground power generation module, and a seabed natural gas hydrate exploitation module; thewave energy power generation module generates the power by the marine waves; the marine temperature difference energy power generation module generates the power by the marine temperature difference;the tide and ocean current underground power generation module generates the power by the tide and the ocean current; the traditional oil-gas production module, the wave energy power generation module, the marine temperature difference energy power generation module and the tide and ocean current underground power generation module share a living foundation equipment and a power foundation equipment, and share a drilling equipment and a seabed oil-gas conveying pipeline along with the seabed natural gas hydrate exploitation module; the electric energy output by the wave energy power generationmodule, the marine temperature difference energy power generation module and the tide and ocean current underground power generation module is externally output by the cables depending on the seabedoil-gas conveying pipelines; and the natural gas hydrate exploitation module exploits the natural gas hydrate by a ocean surface warm-water injection method and a carbon dioxide replacing method.

The invention discloses a submarine ore collecting vehicle and an ore collecting method thereof. The submarine ore collecting vehicle comprises water jet nozzles (1), an ore sucking hood (2), a spiral flow guiding plate (3), an ore slurry pump (4), a pressure-bearing ore storage tank (5), a relay cabin conveying pipeline (9) and an ore collecting vehicle cabin body (10), wherein the water jet nozzles (1) are closely arranged into a plurality of groups along the bottom of ore sucking hood (2) at certain vertically and transversely inclined angles; the spiral flow guiding plate (3) is embedded into the inner side of the ore sucking hood (2) along a spiral line; the ore slurry pump (4) is connected to the ore sucking hood (2) through an ore slurry pump pipeline, so that local negative pressure is formed in the ore sucking hood (2), and a vertical-axis whirlpool which flows upwards is formed under the flow guiding action of the spiral flow guiding plate (3); the ore slurry pump (4) conveys collected ores to a relay cabin through the relay cabin conveying pipeline (9), and is further connected with the pressure-bearing ore storage tank (5). The submarine ore collecting vehicle and the ore collecting method have the advantages of being environmentally friendly, efficient, lower in energy consumption, and reliable.

The invention discloses a natural gas hydrate exploiting method, which comprises the following steps: drilling a communicated well in a hydrate reserving layer; laying a screen pipe on the horizontal segment for well completion and putting a throttling device into a well completion pipe; next, injecting hot water or a hydrate decomposition accelerator into an injection well. At the initial exploiting stage, under the double action of the local low pressure generated by the downstream of the throttling device and the thermal energy of the fluid or the hydrate decomposition accelerator injectedinto the injection well, the hydrate decomposition is started, and then the natural gas generated via decomposition enters the communicated well and flows along with the fluid in a well sleeve to flow out of a production well; and after a period of exploiting, the hydrate near the throttling device is decomposed, and a new flowing channel is formed in the hydrate reserving layer, so that the action area of the fluid on the hydrate reserving layer is enlarged, and the heat and mass transferring efficiency and the hydrate exploiting efficiency are improved. With the increasing of the decomposednatural gas, the gas content in the well sleeve is increased and the pressure in the well sleeve is lowered gradually by reducing the injected discharging volume, so that the decompression exploitation can be realized, and the hydrate exploiting efficiency can be improved.

The invention relates to a kind of new-type marine natural gas hydrate drilling device and method which uses methods including drilling device of three layers fluid circulation passway to mine the hydrate layers. Among them, the first layer is the drilling rod of is hollow in order to produce high-speed efflux, the second is the annular space between drilling rod and sleeve pipe in order to channel into the sea water, the third layer is the annular space between sleeve pipe and stratum well eyes and borehole wall in order to channel out the mixture of hydrate, silt and water. The drilling device and method needs simple equipment, operates easily, can realize the high-efficient exploitation, and solved the problem of the existing technique that lacks of proper drilling device and method for the natural gas hydrate.

The invention discloses a kind of marine natural gas hydrate drilling device and equipment. The method incldues the following steps: exploit the natural gas hydrate layer in the sea floor; separate the silt in the sea floor through silt separating equipment, then transmits the mixture of natural hydrate, resolved gas and water into the resolving device on the sea-level; channel the sea water with higher temperature into the resolving device on to resolve natural gas hydrate; channel out the resolved natural gas and sea water separately. The device includes drilling facility, silt separating equipment, hydrate resolving device and natural gas leadingo ut pipeline, etc. The method and device of the invention well overcome the drawbacks of the existing method for exploiting marine natural gas hydrate, its equipment is simple, operation is easy, cost is low, working efficiency is high, and can apply to extensive exploitation of marine natural gas hydrate.

The invention provides a method and a device for exploiting a deep-sea natural gas hydrate. At present, the development of a submarine natural gas hydrate is still at a starting stage; conventional methods of mechanical fishing, mechanical extraction, hot water perfusion, drilling platform collection and the like are used more frequently; the cost is higher; moreover, the instable natural gas hydrate is easily enabled to excessively decompose; a submarine topography is damaged; according to the method and the device for exploiting the deep-sea natural gas hydrate, on the basis of a hot water perfusion method, a movable bell-mouth-shaped gas collecting hood group and a gas collecting pipe network are arranged at the bottom of a sea; a leakage is prevented; the natural gas hydrate is gasified at a sea bed through the approaches of a temperature rise, a pressure reduction and the like; a gas bubble is collected by a gas collecting hood to be directly led to an offshore platform or an island/reef reservoir. A heat source for the temperature rise can come from the waste heat of a factory on a coast or an island; meanwhile, the submarine topography is protected by comprehensively utilizing the mill tailings of a solid mineral product for backfilling. The method and the device for exploiting the deep-sea natural gas hydrate have the advantages that energy sources are saved; the submarine topography is protected, the waste heat and a waste residue are comprehensively utilized.

The invention relates to a separated blue water local mine production system, belonging to the underwater project technique. It comprises: a surface main ship, a mine producing diving device, and a lifting system. Wherein, the lifting system is formed by several lifting diving devices, which are unmanned non-cable diving devices; the mine producing diving devices are unmanned cable diving devices via the umbilical cord cable connected with the main ship, while the umbilical cord cable comprises the electric and information transmission channel; when lifting the diving devices, the mine producing diving devices and the surface main ship via the water sound to position and transmit information; when in working, the mine producing diving devices produce mine at the bed and lifting diving devices move between the mine producing diving devices and the main ship to transfer collected mine sample, and the fully loaded lifting diving devices is guided to the main ship via the mine producing diving devices; and the empty lifting diving devices is guided to the mine producing diving devices from the main ship. The invention is flexible with lower cost, high practicability, the application for variable mine sources as multi-metal concretion, abundant cobalt crustization and metallic sulfide beds.

The invention relates to a novel lifting system for dee-sea mining. The novel lifting system comprises a mining mechanism, a mine water lifting mechanism and a mine water separating mechanism; the mining mechanism comprises a mining cart which is arranged on the sea floor, a mining cart ore absorbing port is arranged on the front part of the mining cart, and a mining cart ore conveying pump is arranged on the rear part of the mining cart ore absorbing port; the mine water lifting mechanism comprises a high-pressure water feeding pump, a lifting main pipe, a water feeding pipe and a middle bin;the middle bin is connected with a fixed pile which is arranged on the sea floor bottom crust through a middle bin sea floor fixing cable rope, the middle bin is connected with the mining cart through a hose, and a floating body is arranged on the hose; the mine water separating mechanism comprises an ore storage tank, a mine water separating mechanism body and a clean water tank which are arranged on a sea surface mining vessel; and the ore storage tank is connected with the clean water tank through the mine water separating mechanism body. The novel lifting system for deep-sea mining has the advantages that hydraulic power is used for lifting, waste water lifted to the water surface can be fed back to the sea floor, meanwhile, a lifting pump on the sea floor can be driven to lift ore through the waste water, and the environment of the mining sea surface is protected.