CN111852409A - Natural gas hydrate exploitation device and method - Google Patents
Natural gas hydrate exploitation device and method Download PDFInfo
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- CN111852409A CN111852409A CN202010725612.2A CN202010725612A CN111852409A CN 111852409 A CN111852409 A CN 111852409A CN 202010725612 A CN202010725612 A CN 202010725612A CN 111852409 A CN111852409 A CN 111852409A
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000003345 natural gas Substances 0.000 claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 238000003860 storage Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
- 239000007789 gas Substances 0.000 claims description 61
- 239000000203 mixture Substances 0.000 claims description 50
- 239000010802 sludge Substances 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 20
- 238000005065 mining Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000000354 decomposition reaction Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036983 biotransformation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/067—Separating gases from drilling fluids
Abstract
The invention relates to the technical field of natural gas hydrate exploitation, and discloses a natural gas hydrate exploitation device and a natural gas hydrate exploitation method, wherein the device comprises: the device comprises a collecting pipeline, a first tank body, a second tank body, a third tank body and a fourth tank body, wherein a collecting and conveying device is arranged in the collecting pipeline; the first conveying pipe is provided with a second transmission valve; the second jar of body is equipped with the second baroceptor on the second jar of body, the buffer tank, be equipped with the third baroceptor on the buffer tank, the buffer tank passes through the sealed intercommunication of first pipeline with the first jar of body, pass through the sealed intercommunication of second pipeline with the second jar of body, the holding vessel, be equipped with the fourth baroceptor on the holding vessel, the holding vessel passes through the sealed intercommunication of third pipeline with the buffer tank, this kind of natural gas hydrate exploitation device and method, can fully separate and decompose natural gas hydrate, avoid natural gas to leak, and can carry out safe storage to the natural gas, be convenient for transport.
Description
Technical Field
The invention relates to the technical field of natural gas hydrate exploitation, in particular to a natural gas hydrate exploitation device and method.
Background
The conventional petroleum and natural gas resources stored in the world are greatly consumed and can be exhausted quickly. The evaluation results of scientists show that the combustible ice is distributed in an area of 4000 ten thousand square kilometers only in the submarine area, and occupies 1/4 of the total area of the earth ocean. In 2011, the combustible ice distribution area found in the world is as many as 116, the thickness and the large scale of the ore deposit are incomparable with the conventional natural gas field. Scientists estimate that the reserve of subsea combustible ice is at least 1000 years for human use.
The natural gas hydrate is also called as combustible ice, and is an ice-like crystalline substance formed by natural gas and water under high pressure and low temperature conditions and distributed in deep sea sediments or permafrost in land areas. It is also called "combustible ice" because it looks like ice and burns when exposed to fire. The resource density is high, the global distribution is wide, and the resource value is extremely high, so the method becomes a long-term research hotspot in the oil and gas industry.
The natural gas hydrate hardly generates any residue after combustion, and the pollution is much less than that of coal, petroleum and natural gas. 1 cubic meter of combustible ice can be converted to 164 cubic meters of natural gas and 0.8 cubic meters of water. During exploitation, a large amount of methane gas can be released only by heating and decompressing the solid natural gas hydrate.
Combustible ice is formed at 0-10 ℃ and decomposes at temperatures above 20 ℃. The seabed temperature is generally kept at about 2-4 ℃; the combustible ice can be generated at 0 ℃ under 30 atmospheres, the 30 atmospheres can be easily ensured at the depth of the ocean, and the hydrate is less prone to decomposition when the atmospheric pressure is higher; the organic matter on the seabed is precipitated, and the abundant carbon in the organic matter is subjected to biotransformation, so that a sufficient gas source can be generated. The stratum of the seabed is a porous medium, and under the conditions of temperature, pressure and gas source, combustible ice crystals can be generated in the gaps of the medium.
The exploitation of the natural gas hydrate changes the temperature and pressure conditions under which the natural gas hydrate is subjected to, and causes the natural gas hydrate to be decomposed. If the control of the temperature and pressure conditions cannot be effectively realized in the exploitation process of the natural gas hydrate, a series of environmental problems can be caused, such as the intensification of the greenhouse effect, the change of marine ecology, the submarine collapse event and the like.
At present, few devices capable of exploiting the natural gas hydrate exist, and the exploitation process of the natural gas hydrate is greatly limited.
Disclosure of Invention
The invention provides a natural gas hydrate exploitation device and method, which can fully separate and decompose natural gas hydrate, avoid natural gas leakage, safely store natural gas and facilitate transportation.
The invention provides a natural gas hydrate exploitation device, which comprises: the collecting pipeline is internally provided with a collecting and conveying device and is used for extracting the mixture of the natural gas hydrate and the sludge from the seabed and conveying the extracted mixture to the first tank body;
the first tank body is communicated with the upper end of the collecting pipeline and is used for receiving the mixture; the natural gas hydrate and the sludge are separated in the first tank body, a first electric blocking cover capable of sealing the collecting pipeline is arranged on the inner side face of the first tank body, and a first air pressure sensor is arranged on the first tank body;
the high-pressure water pipe extends into the first tank body and is used for diluting sludge in the mixture in the first tank body and separating out natural gas hydrate, and a control valve is arranged on the high-pressure water pipe;
the muddy water conveying pipe is obliquely and downwards arranged between the first tank body and the collecting pipeline, two ends of the muddy water conveying pipe are respectively communicated with the lower parts of the first tank body and the collecting pipeline, the muddy water conveying pipe is used for conveying muddy water formed by diluting sludge in the first tank body back to an area where the mixture is extracted through the collecting pipeline, and a first transmission valve is arranged on the muddy water conveying pipe;
the first conveying pipe is arranged between the first tank body and the second tank body, two ends of the first conveying pipe are respectively communicated with the first tank body and the second tank body, the first conveying pipe is used for conveying natural gas hydrate or porous medium fixed with the natural gas hydrate into the second tank body, and a second transmission valve is arranged on the first conveying pipe;
the second tank body is positioned below the first tank body, a second air pressure sensor is arranged on the second tank body, and a heating device is arranged in the second tank body and used for heating and decomposing the natural gas hydrate to decompose natural gas;
the buffer tank is used for collecting natural gas, a third air pressure sensor is arranged on the buffer tank, the buffer tank is hermetically communicated with the first tank body through a first pipeline, the buffer tank is hermetically communicated with the second tank body through a second pipeline, a first gas control valve is arranged on the first pipeline, and a second gas control valve is arranged on the second pipeline;
the storage tank is used for storing natural gas, a fourth air pressure sensor is arranged on the storage tank, and the storage tank is communicated with the buffer tank in a sealing mode through a third pipeline;
the collecting and conveying device, the control valve, the first transmission valve, the second transmission valve, the first gas control valve, the second gas control valve, the first electric blocking cover, the first gas pressure sensor, the second gas pressure sensor, the third gas pressure sensor, the fourth gas pressure sensor and the heating device are respectively connected with a control system and a power supply, and the control system is connected with the power supply.
The collecting pipeline comprises a plurality of sections of pipelines which are sequentially detachably connected, collecting and conveying devices are arranged in each section of pipeline and comprise a fixed plate, a first driving motor is arranged on the fixed plate, an output shaft of the first driving motor is connected with a spiral conveying blade through a coupler, a first conveying opening through which a mixture passes is formed in the fixed plate, the first driving motor is connected with a power supply through a wire, and the first driving motor is connected with a control system.
Be equipped with agitator motor on the first jar of body, agitator motor's output shaft fixed connection pivot, it is internal that the first jar is stretched into to the pivot, is equipped with stirring vane in the pivot.
The collecting pipeline is communicated with the side face of the first tank body through a second conveying port, and a first electric blocking cover is arranged on the inner side of the second conveying port and used for sealing the second conveying port when natural gas hydrate is separated;
and a plurality of high-pressure nozzles are also arranged in the first tank body and are respectively communicated with the high-pressure water pipe.
The first pipeline and the second pipeline are connected with one end of the air inlet main pipe through a three-way joint, the other end of the air inlet main pipe is communicated with the buffer tank, and the air inlet main pipe is provided with an air suction pump which is respectively connected with a power supply and a control system.
And a second conveying pipe is arranged between the second tank body and the collecting pipeline, two ends of the second conveying pipe are respectively communicated with the lower parts of the second tank body and the collecting pipeline, and a third transmission valve is arranged on the second conveying pipe and is respectively connected with a power supply and a control system.
A natural gas hydrate mining method comprising the steps of:
s1, extracting a mixture of natural gas hydrate and sludge at the bottom of the ocean through an acquisition and conveying device in the acquisition pipeline, and conveying the mixture into a first tank body;
s2, injecting high-pressure water into the mixture in the first tank body through a high-pressure water pipe to dilute the sludge, and separating out natural gas hydrate or a porous medium fixed with the natural gas hydrate;
s3, feeding the diluted muddy water back to the mixture extraction area through a muddy water conveying pipe and a collecting pipeline;
s4, feeding the separated natural gas hydrate and the porous medium fixed with the natural gas hydrate into a second tank body through a first conveying pipe and a second transmission valve;
s5, heating and decomposing the natural gas hydrate in the second tank body through a heating device to decompose natural gas;
s6, enabling natural gas to enter the buffer tank through a second pipeline and a second gas control valve;
s7, when the gas pressure in the buffer tank reaches the set gas pressure, the gas enters the storage tank through a third pipeline;
and S8, when the gas pressure in the storage tank reaches the set gas pressure, replacing the storage tank with a new one, and realizing the exploitation of the natural gas hydrate.
The mixture drives the rotating shaft in the first tank body through the stirring motor, the rotating shaft drives the stirring blades to stir the mixture, water and sludge are fully mixed and diluted to form slurry or muddy water, and natural gas hydrate is separated.
The natural gas hydrate is heated in the second tank body and then decomposed, the decomposed natural gas is sucked into the buffer tank through the gas suction pump, the pressure of the natural gas hydrate is reduced in the suction process of the gas suction pump, the pressure is reduced, the temperature is increased at the same time, and the natural gas hydrate can be quickly decomposed.
Compared with the prior art, the invention has the beneficial effects that:
the invention extracts the mixture of natural gas hydrate and sludge from the sea bottom through the collecting pipeline provided with the collecting and conveying device, decomposes the sludge in the first tank body through high-pressure water, separates out the natural gas hydrate, in the process of decomposing the sludge, part of the natural gas hydrate is decomposed into natural gas after the pressure is reduced, the decomposed natural gas enters the buffer tank through the first pipeline, the sludge is decomposed into muddy water through high-pressure water flow, the muddy water is sent back to the area where the mixture is extracted through the muddy water conveying pipeline and the collecting pipeline, the rest natural gas hydrate which is not decomposed is sent into the second tank body through the first conveying pipe for heating and decomposition, the natural gas which is decomposed through heating and temperature rise enters the buffer tank through the second pipeline, when the pressure of the natural gas in the buffer tank reaches the set pressure value, the natural gas in the buffer tank enters the storage tank through the, and when the pressure of the natural gas in the storage tank reaches a set value, replacing the storage tank.
This device can fully separate natural gas hydrate and silt, can decompose natural gas hydrate, avoids natural gas to leak, and the area of taking is filled into with muddy water sediment back silt simultaneously, avoids taking the area to sink and leads to natural gas hydrate pressure to reduce the back and decomposes, can carry out safe storage to the natural gas through buffer tank and holding vessel, and the holding vessel is convenient for transport the natural gas.
Drawings
Fig. 1 is a schematic structural diagram of a section of a natural gas hydrate production device provided by the invention.
Fig. 2 is a schematic structural diagram of a transmission valve in the natural gas hydrate production device provided by the invention.
Fig. 3 is a control schematic block diagram of a gas hydrate production device provided by the invention.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to fig. 1-3, but it should be understood that the scope of the present invention is not limited to the embodiment.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, a natural gas hydrate production apparatus provided in an embodiment of the present invention includes: the collecting pipeline 1 is internally provided with a collecting and conveying device and is used for extracting a mixture of natural gas hydrate and sludge from the seabed and conveying the extracted mixture into the first tank body 10;
the first tank body 10 is communicated with the upper end of the collecting pipeline 1 and is used for receiving the mixture; separating the natural gas hydrate from the sludge in a first tank 10 of the natural gas hydrate, wherein a first air pressure sensor is arranged on the first tank 10;
the high-pressure water pipe 9 extends into the first tank body 10 and is used for diluting sludge in the mixture in the first tank body 10 and separating out natural gas hydrate, and a control valve is arranged on the high-pressure water pipe 9;
the muddy water conveying pipe 16 is obliquely and downwards arranged between the first tank body 10 and the collecting pipeline 1, two ends of the muddy water conveying pipe 16 are respectively communicated with the first tank body 10 and the lower part of the collecting pipeline 1, the muddy water conveying pipe 16 is used for conveying muddy water formed by diluting sludge in the first tank body 10 back to a mixture extracting area through the collecting pipeline 1, and a first transmission valve 34 is arranged on the muddy water conveying pipe 16;
the first conveying pipe 11 is arranged between the first tank body 10 and the second tank body 19, two ends of the first conveying pipe are respectively communicated with the first tank body 10 and the second tank body 19, the first conveying pipe 11 is used for conveying natural gas hydrate or porous media fixed with the natural gas hydrate into the second tank body 19, and a second transmission valve 13 is arranged on the first conveying pipe 11;
the second tank 19 is positioned below the first tank 10, a second air pressure sensor is arranged on the second tank 19, and a heating device 32 is arranged in the second tank 19 and used for heating and decomposing the natural gas hydrate to decompose natural gas;
the buffer tank 24 is used for collecting natural gas, a third air pressure sensor is arranged on the buffer tank 24, the buffer tank 24 is in sealed communication with the first tank body 10 through a first pipeline 38, the buffer tank 24 is in sealed communication with the second tank body 19 through a second pipeline 21, a first gas control valve 39 is arranged on the first pipeline 38, and a second gas control valve 23 is arranged on the second pipeline 21;
the storage tank 25 is used for storing natural gas, a fourth air pressure sensor is arranged on the storage tank 25, and the storage tank 25 is communicated with the buffer tank 24 in a sealing mode through a third pipeline 30;
the collecting and conveying device, the control valve, the first transmission valve 34, the second transmission valve 13, the first gas control valve 39, the second gas control valve 23, the first gas pressure sensor, the second gas pressure sensor, the third gas pressure sensor, the fourth gas pressure sensor and the heating device 32 are respectively connected with a control system and a power supply, and the control system is connected with the power supply.
The collecting pipeline 1 comprises a plurality of sections of pipelines which are sequentially detachably connected, collecting and conveying devices are fixedly arranged in each section of pipeline and comprise a fixing plate 5, a first driving motor 3 is arranged on the fixing plate 5, an output shaft of the first driving motor 3 is connected with a spiral conveying blade 2 through a coupler, a first conveying opening 4 through which a mixture passes is formed in the fixing plate 5, the first driving motor 3 is connected with a power supply through a wire, and the first driving motor 3 is connected with a control system.
The detachable connection is tongue-and-groove type threaded sleeve connection.
The stirring device is characterized in that a stirring motor 35 is arranged on the first tank body 10, an output shaft of the stirring motor 35 is fixedly connected with a rotating shaft 36 through a coupler, the lower end of the rotating shaft 36 extends into the first tank body 10, and a plurality of stirring blades 37 are arranged on the rotating shaft 36.
The heating device 32 is a heater, and a temperature controller is arranged on the heater and is in signal connection with a control system.
The collecting pipeline 1 is communicated with the side face of the first tank body 10 through a second conveying port, and a first electric blocking cover 7 is arranged on the inner side of the second conveying port and used for sealing the second conveying port when natural gas hydrate is separated;
a plurality of high-pressure nozzles 8 are further arranged in the first tank body 10, and the high-pressure nozzles 8 are respectively communicated with a high-pressure water pipe 9.
The plurality of high-pressure nozzles 8 are uniformly arranged on the inner side surface of the top of the first tank 10 and are positioned on the circumferential outer side of the rotating shaft 36.
The first pipeline 38 and the second pipeline 21 are connected with one end of an air inlet manifold 40 through a three-way joint, the other end of the air inlet manifold 40 is communicated with the buffer tank 24, and the air suction pump 22 is arranged on the air inlet manifold 40.
A second conveying pipe 33 is arranged between the second tank body 19 and the collecting pipeline 1, two ends of the second conveying pipe 33 are respectively communicated with the lower parts of the second tank body 19 and the collecting pipeline 1, and a third transmission valve 6 is arranged on the second conveying pipe 33.
When the second tank 19 is rich in impurities, the impurities are conveyed into the mining area of the mixture through the second conveying pipe 33 and the third transmission valve 6, and the mining area is prevented from collapsing.
The first transmission valve 34, the second transmission valve 13 and the third transmission valve 6 all include: the second driving motor 12, the rotating shaft 17 and the first baffle 14 symmetrically arranged on the rotating shaft 17, an output shaft of the second driving motor is fixedly connected with the rotating shaft 17 through a coupler, a sealing ring is arranged at the edge of the baffle 14, the size and shape of the first baffle 14 are respectively matched with the shape and size of the first conveying pipe 11 and the muddy water conveying pipe 16 obtained by the second conveying pipe 33, the first transmission valve 34, the second transmission valve 13 and the third transmission valve 6 are in a sealed closed state when the first baffle 14 is respectively perpendicular to the first conveying pipe 11, the muddy water conveying pipe 16 and the second conveying pipe 33, otherwise, the muddy water conveying pipes are in an open state, the size of a muddy water opening can be adjusted according to the included angle between the first baffle 14 and the first conveying pipe 11, and the included angle between the muddy water conveying pipe 16 and the second conveying pipe 33, and the adjustment of the flow of muddy water or the decomposition.
The first transmission valve 34, the second transmission valve 13 and the third transmission valve 6 are respectively in signal connection with the control system, and the first transmission valve 34, the second transmission valve 13 and the third transmission valve 6 can be manually adjusted at the same time.
The first electric shield cover 7, the second electric shield cover 18 and the third electric shield cover 20 all include: electric telescopic handle, second baffle and sealing strip, electric telescopic handle's free end and the medial surface fixed connection of second baffle, the lateral surface circumference of second baffle is equipped with the sealing strip, sealing strip and open-ended position phase-match, and the lid closes the back, and the second baffle is respectively with the first jar of body 10 or the 19 sealing connection of the second jar of body.
The electric telescopic rod is in signal connection with the control system and is of a waterproof type.
The present invention relates to a waterproof electric component for electric components in contact with water.
Be equipped with blast pipe 26 on the buffer tank 24, be equipped with discharge valve 27 on the blast pipe 26, be equipped with intake pipe 28 on the holding vessel 25, be equipped with admission valve 29 on the intake pipe 28, the sealed connection can be dismantled with intake pipe 28 through third pipeline 30 to blast pipe 26.
And air pressure sensors are arranged on the buffer tank 24 and the storage tank 25, the air pressure sensors are respectively connected with a control system, and the control system is connected with an alarm.
The working principle and the process are as follows: the whole device can be arranged on the sea surface or in a submarine, the submarine submerges into the seabed under the sea surface, the lower end of the collecting pipeline 1 is provided with a cutting opening 31 which is convenient to insert into the seabed of the seabed, the collecting pipeline 1 is formed by a plurality of sections of pipelines which are sequentially detachably connected, the first driving motor 3 drives the spiral conveying blade 2 to rotate, the mixture of the natural gas hydrate and the sludge is conveyed from bottom to top from the seabed and enters the pipeline of the previous section through the first conveying opening 4, and the mixture is sequentially conveyed into the first tank body 10 through a plurality of collecting and conveying devices.
After the mixture enters the first tank 10, the high-pressure water pipe 9 is opened, high-pressure water is sprayed into the first tank 10 to separate impurities such as natural gas hydrate and sludge, the sludge is changed into slurry and then becomes muddy water under the action of the high-pressure water, meanwhile, the stirring motor 35 is started to drive the rotating shaft 36 to rotate, the mixture and the water are stirred by the stirring blades 37 to accelerate the separation process of the natural gas hydrate and the sludge, the first driving valve 34 is opened, the muddy water enters the lower part of the collecting pipeline 1 through the muddy water conveying pipe 16, the soil sinks to gradually fill the original area for extracting the mixture under the action of gravity, the collecting pipeline 1 is lifted, the muddy water enters the area for extracting the mixture, the filter screen 15 is arranged at the position, communicated with the muddy water conveying pipe 16, the natural gas hydrate can be filtered and collected, and part of the natural gas hydrate can be, natural gas enters the buffer tank 24 through a first conduit 38 and a first gas control valve 39.
Although the collecting pipe 1 is used for transporting muddy water while conveying the mixture, the muddy water flows down along the edge of the collecting pipe 1, and the mixture is conveyed upward along the middle of the collecting pipe 1 by the action of the screw conveyor blade 2.
The rest natural gas hydrate which is not decomposed falls into the bottom of the first tank body 10 under the action of gravity, and the second transmission valve 13 is started and enters the second tank body 19 through the first conveying pipe 11.
A liquid level sensor is arranged in the first tank body 10 and is connected with a control system.
The natural gas hydrate is heated and decomposed into natural gas in the second tank body 19 through the heating device 32, and the second tank body 19 is sealed through the second electric retaining cover 18 and the third electric retaining cover 20 before heating, so that natural leakage is avoided from entering the water body.
The natural gas in the second tank 19 is sucked by the gas suction pump 22 so that the inside of the second tank 19 is maintained in a state close to vacuum, and then the next decomposition of the natural gas hydrate is performed.
When the second tank 19 contains a large amount of impurities, the impurities are transferred into the region where the mixture is extracted through the second transfer pipe 33 and the third transfer valve 6.
A natural gas hydrate mining method is characterized by comprising the following steps:
s1, extracting a mixture of natural gas hydrate and sludge at the bottom of the ocean by using an acquisition and conveying device in the acquisition pipeline 1, and conveying the mixture into the first tank body 10;
s2, injecting high-pressure water into the mixture in the first tank body 10 through the high-pressure water pipe 9 to dilute the sludge, and separating natural gas hydrate or a porous medium fixed with the natural gas hydrate;
s3, feeding the diluted muddy water back to the mixture extraction area through the muddy water conveying pipe 16 and the collecting pipeline 1;
s4, feeding the separated natural gas hydrate and the porous medium fixed with the natural gas hydrate into the second tank 19 through the first conveying pipe 11 and the second transmission valve 13;
s5, heating and decomposing the natural gas hydrate in the second tank 19 through a heating device to decompose natural gas;
s6, enabling the natural gas to enter the buffer tank 24 through the second pipeline 21 and the second gas control valve 23;
s7, when the gas pressure in the buffer tank 24 reaches the set gas pressure, the gas enters the storage tank 25 through the third pipeline 30;
and S8, when the gas pressure in the storage tank 25 reaches the set gas pressure, replacing the storage tank 25 with a new one, and realizing the exploitation of the natural gas hydrate.
The mixture is driven by a stirring motor 35 to drive a rotating shaft 36 in the first tank 10, the rotating shaft 36 drives a stirring blade 37 to stir the mixture, water and sludge are fully mixed and diluted to form slurry or muddy water, and natural gas hydrate is separated.
The natural gas hydrate is heated in the second tank 19 and then decomposed, the decomposed natural gas is pumped into the buffer tank 24 through the gas suction pump 22, the pressure of the natural gas hydrate is reduced in the pumping process of the gas suction pump 22, the pressure is reduced, the temperature is increased at the same time, and the natural gas hydrate can be quickly decomposed.
The invention extracts the mixture of the natural gas hydrate and the sludge from the seabed by arranging the collecting and conveying device in the collecting pipeline, separating the sludge and the natural gas hydrate in the first tank body through high-pressure water flow to separate the natural gas hydrate, in the process of decomposing the sludge, the pressure of part of the natural gas hydrate is reduced and decomposed into natural gas, the decomposed natural gas enters the buffer tank through the first pipeline, the sludge is decomposed into muddy water through high-pressure water, the muddy water is conveyed into an area where the mixture is extracted through a muddy water conveying pipe, the rest natural gas hydrate which is not decomposed enters the second tank body through the first conveying pipe for heating decomposition, the heated and decomposed natural gas enters the buffer tank through the second pipeline, after the natural gas pressure in the buffer tank reaches the set value, the natural gas in the buffer tank enters the storage tank through the third pipeline.
This device can fully separate and decompose natural gas hydrate, avoids the natural gas to leak, and can carry out safe storage, the transportation of being convenient for to the natural gas.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. A gas hydrate mining apparatus, comprising:
the collecting pipeline (1) is internally provided with a collecting and conveying device and is used for extracting the mixture of the natural gas hydrate and the sludge from the seabed and conveying the extracted mixture into the first tank body (10);
the first tank body (10) is communicated with the upper end of the collecting pipeline (1) and is used for receiving the mixture; the natural gas hydrate and the sludge are separated in the first tank body (10), a first electric baffle cover (7) capable of sealing the collecting pipeline (1) is arranged on the inner side surface of the first tank body (10), and a first air pressure sensor is arranged on the first tank body (10);
the high-pressure water pipe (9) extends into the first tank body (10) and is used for diluting sludge in the mixture in the first tank body (10) and separating out natural gas hydrate, and a control valve is arranged on the high-pressure water pipe (9);
the muddy water conveying pipe (16) is obliquely and downwards arranged between the first tank body (10) and the collecting pipeline (1), two ends of the muddy water conveying pipe (16) are respectively communicated with the first tank body (10) and the lower part of the collecting pipeline (1) and used for conveying muddy water formed by diluting sludge in the first tank body (10) back to a mixture extracting area through the collecting pipeline (1), and a first transmission valve (34) is arranged on the muddy water conveying pipe (16);
the first conveying pipe (11) is arranged between the first tank body (10) and the second tank body (19), two ends of the first conveying pipe are respectively communicated with the first tank body (10) and the second tank body (19) and used for conveying natural gas hydrate or porous medium fixed with the natural gas hydrate into the second tank body (19), and a second transmission valve (13) is arranged on the first conveying pipe (11);
the second tank body (19) is positioned below the first tank body (10), a second air pressure sensor is arranged on the second tank body (19), and a heating device (32) is arranged in the second tank body (19) and used for heating and decomposing the natural gas hydrate to decompose natural gas;
the buffer tank (24) is used for collecting natural gas, a third air pressure sensor is arranged on the buffer tank (24), the buffer tank (24) is in sealed communication with the first tank body (10) through a first pipeline (38), the buffer tank (24) is in sealed communication with the second tank body (19) through a second pipeline (21), a first gas control valve (39) is arranged on the first pipeline (38), and a second gas control valve (23) is arranged on the second pipeline (21);
the storage tank (25) is used for storing natural gas, a fourth air pressure sensor is arranged on the storage tank (25), and the storage tank (25) is communicated with the buffer tank (24) in a sealing mode through a third pipeline (30);
the collecting and conveying device, the control valve, the first transmission valve (34), the second transmission valve (13), the first gas control valve (39), the second gas control valve (23), the first electric blocking cover (7), the first gas pressure sensor, the second gas pressure sensor, the third gas pressure sensor, the fourth gas pressure sensor and the heating device (32) are respectively connected with a control system and a power supply, and the control system is connected with the power supply.
2. The gas hydrate exploitation device according to claim 1, wherein the collection pipeline (1) comprises a plurality of sections of pipelines which are detachably connected in sequence, each section of pipeline is provided with a collection conveying device, each collection conveying device comprises a fixing plate (5), the fixing plate (5) is provided with a first driving motor (3), an output shaft of each first driving motor (3) is connected with the spiral conveying blade (2) through a coupling, the fixing plate (5) is provided with a first conveying port (4) through which the mixture passes, the first driving motors (3) are connected with a power supply through a lead, and the first driving motors (3) are connected with the power supply and a control system.
3. The gas hydrate mining device according to claim 1, wherein the first tank (10) is provided with a stirring motor (35), an output shaft of the stirring motor (35) is fixedly connected with a rotating shaft (36), the rotating shaft (36) extends into the first tank (10), the rotating shaft (36) is provided with stirring blades (37), and the stirring motor (35) is connected with a power supply and a control system.
4. The natural gas hydrate mining device according to claim 1, wherein the collection pipeline (1) is communicated with the side surface of the first tank body (10) through a second delivery port, and a first electric blocking cover (7) is arranged on the inner side of the second delivery port and used for closing the second delivery port when the natural gas hydrate is separated;
a plurality of high-pressure nozzles (8) are further arranged in the first tank body (10), and the high-pressure nozzles (8) are respectively communicated with the high-pressure water pipes (9).
5. A gas hydrate mining device as claimed in claim 1, wherein the third pipeline (30) is provided with a flow valve and a gas pump, and the flow valve and the gas pump are respectively connected with a power supply and a control system.
6. The gas hydrate exploitation device according to claim 1, wherein the first pipeline (38) and the second pipeline (21) are connected to one end of a gas inlet manifold (40) through a tee joint, the other end of the gas inlet manifold (40) is communicated with the buffer tank (24), a gas suction pump (22) is arranged on the gas inlet manifold (40), and the gas suction pump (22) is respectively connected with a power supply and a control system.
7. The gas hydrate exploitation device according to claim 1, wherein a second conveying pipe (33) is arranged between the second tank (19) and the collection pipeline (1), two ends of the second conveying pipe (33) are respectively communicated with the second tank (19) and the lower part of the collection pipeline (1), a third transmission valve (6) is arranged on the second conveying pipe (33), and the third transmission valve is respectively connected with a power supply and a control system.
8. A natural gas hydrate production method using the natural gas hydrate production apparatus according to any one of claims 1 to 7, comprising the steps of:
s1, extracting a mixture of natural gas hydrate and sludge at the bottom of the ocean by a collecting and conveying device in the collecting pipeline (1), and conveying the mixture into the first tank body (10);
s2, injecting high-pressure water into the mixture in the first tank body (10) through the high-pressure water pipe (9) to dilute the sludge, and separating out natural gas hydrate or a porous medium fixed with the natural gas hydrate;
s3, feeding the diluted muddy water back to the mixture extraction area through a muddy water conveying pipe (16) and a collecting pipeline (1);
s4, feeding the separated natural gas hydrate and the porous medium fixed with the natural gas hydrate into a second tank (19) through a first conveying pipe (11) and a second transmission valve (13);
s5, heating and decomposing the natural gas hydrate in the second tank body (19) through a heating device to decompose natural gas;
s6, enabling the natural gas to enter a buffer tank (24) through a second pipeline (21) and a second gas control valve (23);
s7, when the gas pressure in the buffer tank (24) reaches the set gas pressure, the gas enters the storage tank (25) through the third pipeline (30);
and S8, when the gas pressure in the storage tank (25) reaches the set gas pressure, replacing the storage tank (25) with a new one, and realizing the exploitation of the natural gas hydrate.
9. A mining method of a natural gas hydrate mining device according to claim 8, characterized in that the mixture is stirred in the first tank (10) through a stirring motor (35) driving a rotating shaft (36), the rotating shaft (36) driving a stirring blade (37) to stir the mixture, water and sludge are fully mixed and diluted to form slurry or muddy water, and natural gas hydrate is separated.
10. A mining method of a natural gas hydrate mining device according to claim 8, wherein the natural gas hydrate is heated in the second tank body and then decomposed, the decomposed natural gas is pumped into the buffer tank (24) by the gas suction pump (22), and the pressure of the natural gas hydrate is reduced while the temperature is increased during the pumping process of the gas suction pump (22), so that the natural gas hydrate can be rapidly decomposed.
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| CN113354251A (en) * | 2021-06-07 | 2021-09-07 | 郑州轻工业大学 | Rapid concentration and purification treatment device and method for hydrate sludge |
| CN113653936A (en) * | 2021-08-18 | 2021-11-16 | 湖州梵科科技有限公司 | Natural gas output and storage system |
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Effective date of registration: 20231206 Address after: Room 101, 1st Floor, Songbei Park Building, Heilongjiang University of Science and Technology Science Park, No. 2468 Puyuan Road, Songbei District, Harbin City, Heilongjiang Province, 150022 Patentee after: Heilongjiang Yurui Security Technology Service Co.,Ltd. Address before: 150022 No. 2468 Puyuan Road, Songbei District, Harbin City, Heilongjiang Province Patentee before: HEILONGJIANG University OF SCIENCE AND TECHNOLOGY |