CN100386500C - Method and device for extracting natural gas hydrate - Google Patents
Method and device for extracting natural gas hydrate Download PDFInfo
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- CN100386500C CN100386500C CNB2004100772728A CN200410077272A CN100386500C CN 100386500 C CN100386500 C CN 100386500C CN B2004100772728 A CNB2004100772728 A CN B2004100772728A CN 200410077272 A CN200410077272 A CN 200410077272A CN 100386500 C CN100386500 C CN 100386500C
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- hydrate
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
Abstract
The present invention discloses a method and a device for extracting natural gas hydrates. A hydrate reserving layer is heated by high heat generated at the heat end of a heat pump by using the principle that heat flows from low-position heat source to high-position heat source through the heat pump, and natural gas is decomposed the heated hydrate reserving layer. The method and the device are used for extracting the natural gas from the hydrate, can effectively save resources and have wide application prospects.
Description
Technical field
The present invention relates to a kind of method and device thereof of exploitation of gas hydrate.
Background technology
Gas hydrates (Natural Gas Hydrate is called for short Gas Hydrate) claim cage compound (Clathrate) again.It is ice, non-stoichiometric, the cage type crystalline compounds of the class of being made up of water and natural gas under certain condition (salinity of suitable temperature, pressure, gas saturation, water, pH value etc.), and it meets fire is incendivity.The hydrate overwhelming majority that exists at occurring in nature is a methane hydrate.Generally, obtaining methane from decomposition of hydrate is more than 160 times of hydrate volume, and the total amount of the natural gas that exists with solid-state form Duos one times than fossil fuel reserves on the earth, thus people hydrate as future important energy stock.The methane phosphorus content is less than coal or oil in addition, and the carbon dioxide that methane produces only is half of coal, is a kind of cleaner energy
By calculating, the uses energy equilibrium conditions, under the situation of hypothesis noenergy loss, the energy that obtains from hydrate gas is 15.5 times of decomposition water compound energy, therefore exploitation of gas hydrate has certain commercial value, but because the exploitation of gas hydrates is faced with economical and technical feasibility problem, the development technique of gas hydrates is still at the experimental stage.The thinking of exploitation of gas hydrates is that the gas hydrates that at first will contain in deposit decompose basically, be used then, the method that present stage proposes mainly contains thermal excitation, decompression and injection chemical agent (Sloan E D Jr.Clathrate hydrate of natural gases.New York:MarcerInc., 1997).No matter be thermal excitation, decompression or injection chemical agent, each method all has the shortcoming of self, for example in the process of hot-water flooding, must import sensible heat before separating, simultaneously need again heat is outputed in the non-hydrated rock, add and pine for having 10% to 75% heat waste to lose; And the effect of decompression method is slow, and efficient is low, and needs higher reservoir temperature; Annotate then expense costliness of chemical agent, effect is slow, etching apparatus, and in hydrate, be difficult to diffusion, should not when extracting hydrate on bottom of sea, use.
The natural gas main component that gas hydrates decompose gained is a methane, and its boiling point is-162 ℃ under normal pressure, is difficult for liquefaction.The natural gas accumulating mode of practical application at present has: utilize cryogenic technique with natural gas liquefaction (LNG), store, transport with the form of liquid; Adopt the high pressure method transport natural gas by pipeline; Utilize the suction-operated natural gas-storing of porous media etc.At present, most natural gases (account for natural gas total amount 75%) adopt line transportation, but its initial investment is big, and trans-oceanic transportation is difficult for realizing.And LNG is owing to will adopt low-temperature liquefaction, the running cost height.Utilize the characteristics natural gas-storing of gas hydrate object height reserves. can reduce operating charges; The storage of gas hydrates (NGH) simultaneously is low than compressed natural gas, liquefied natural gas pressure, has increased the safety and the reliability of system. aspect economy, have certain advantage.
Heat pump is that a kind of high potential that utilizes makes heat flow to the energy saver of high-order thermal source from low level heat energy.As its name suggests, heat pump is also just as pump, can the low level heat energy that can not directly utilize (as air, soil, contained heat energy in the water, solar energy, industrial waste heat etc.) be converted to utilizable high level heat, save the part high potential (as coal thereby reach, combustion gas, oil, electricity etc.) purpose.Though heat pump has consumed certain high potential, the heat that it is supplied with is the high potential that consumed and the low potential energy sum of absorption, so adopt heat pump assembly can save high potential.Because water density maximum in the time of 4 ℃, therefore the temperature of seabed water is approximately about 4 ℃ usually, if the seawater in seabed utilizes heat pump principle as low level heat energy, hydrate layer is heated exploitation of gas hydrate, with effective energy conservation.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of method and apparatus that utilizes the heat pump principle exploitation of gas hydrate is provided.
For realizing above purpose, the main technical schemes that the present invention adopts is: the cold that producing hydrate in the heat of heating production of water compound and storage, the transportation needs provides by heat pump.This technical scheme comprises following steps:
A) high temperature that produces of the hot junction by heat pump in the gas producing device (13) heats the hydrate reservoir;
B) natural gas that decomposites after hydrate reservoir (7) is heated imports hydrate by natural gas flow line (1) and generates jar (10) fast;
C) the cold junction cooling water compound by heat pump in the gas producing device (13) generates water and the natural gas in jar (10) fast, makes it to regenerate hydrate;
D) hydrate that hydrate will be housed generates jar (10) fast and directly carries disembarkation;
E) hydrate that generates fast in jar (10) of vaporize water compound obtains natural gas on the coast; This scheme can also realize as follows:
A) high temperature that produces of the hot junction by heat pump in the gas producing device (13) heats the hydrate reservoir;
B) natural gas that decomposites after hydrate reservoir (7) is heated is transported to the gas production platform (14) on sea by natural gas flow line (1);
C) at the gas production platform (14) on sea natural gas is handled, by the compression liquefaction or change into solid hydrate, be delivered to the user then.
The heat pump principle exploitation of gas hydrate device that utilizes of the present invention comprises heat pump, gas production pipeline, hot water circuit pipeline etc.Wherein heat pump is made up of compressor, expansion valve, evaporimeter and condenser etc.Be provided with control valve, snap joint and control valve on the natural gas flow line successively, an end connects the hydrate reservoir, and gas production platform or hydrate that the other end connects the sea generate jar fast.The two sides that hydrate generates jar (10) fast link to each other with heat pump by a circulating water pipeline that is provided with control valve, snap joint and control valve successively respectively.
Device of the present invention in use, the condenser of heat pump heating outer circulation cooling water, cooling water obtain to inject hydrate layer behind the heat makes decomposition of hydrate obtain natural gas.Natural gas generates jar fast by gas production platform or the hydrate that flow line is transported to the sea.When natural gas is transported to hydrate when generating fast jar, the cold that evaporimeter obtains is supplied with hydrate and is generated jar fast, natural gas and the reactant aqueous solution generation solid hydrate for preparing in advance.After the aqueous solution changed into hydrate fully, closed control valve was taken snap joint apart, changed another hydrate and generated jar fast.Hydrate generates a jar directly shipment transportation after filling hydrate fast, transports to and specifies the vaporization of hydrate treatment plant.After having vaporized, the hydrate that the aqueous solution is housed is generated jar fast transport back recycling.When natural gas is delivered directly to the gas production platform on sea, at the gas production platform on sea natural gas is handled, by the compression liquefaction or change into solid hydrate, be delivered to the user then.
For natural G﹠W can be generated rapidly, can in the water that hydrate generates jar fast, add a certain amount of chemical addition agent, for example lauryl sodium sulfate (SDS) of 1200ppm alkyl polyglycoside (APG) or 300ppm.
The working medium that heat pump uses is selected lower boiling working medium for use, for example freon etc.
The electric energy of this device is provided by the gas production platform, and the automatic control section of device is also in Ground Control.For device can be moved under water, device can be with certain power-equipment, for example screw and wheel.
The present invention compared with prior art has following remarkable advantage and good effect: made full use of the cold energy and the heat energy of heat pump, and more energy-conservation than other direct heat injection methods.Device among the present invention, simple to operate, easy to use, realized exploitation and accumulating simultaneously.Because the gas hydrates stock number is very huge, very big commerce exploitation prospect is arranged, the present invention has great application prospect.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the apparatus structure schematic diagram that utilizes one of the inventive method exploitation of gas hydrate;
Fig. 2 is two exploitation sea bed gas hydrate simplified schematic diagram of utilizing the inventive method;
Fig. 3 is the apparatus structure schematic diagram that utilizes two exploitation of gas hydrate of the inventive method.
Description of reference numerals; 1, natural gas flow line; 2, evaporimeter; 3, expansion valve; 4, compressor; 5, condenser; 6, refrigeration working medium; 7, hydrate reservoir; 8, outer circulation waterpipe; 9, carry the cool circulation water pipeline; 10, hydrate generates jar fast; 11, the aqueous solution; 12 cables; 13, heat pump; 14, gas production platform; 15, seawater; F1 ~ F6 control valve; J1 ~ J3 snap joint.
The specific embodiment
Fig. 1 is the structural representation that utilizes one of the inventive method exploitation of gas hydrate.Heat pump 13 is made up of evaporimeter 2, expansion valve 3, compressor 4 and condenser 5 etc.Evaporimeter 2, expansion valve 3, compressor 4 and condenser 5 link to each other by pipeline, and refrigeration working medium freon is housed in the pipeline.Evaporimeter 2 connects one and carries cool circulation water pipeline 9, be connected to four control valves (F3, F4, F5, F6) and two snap joints (J2, J3) in the pipeline 9, pipeline 9 generates jar 10 fast by hydrate, hydrate generates jar 10 fast three interfaces, take over road 9 and natural gas flow line 1 respectively, natural gas flow line 1 is equipped with two control valves (F1, F2) and a snap joint J1 too.
Adopt device shown in Figure 1, realize the exploitation of gas hydrates by following step: condenser 5 heating outer circulation cooling waters, cooling water obtains to make decomposition of hydrate obtain natural gas by outer circulation waterpipe 8 injection hydrate reservoirs 7 behind the heat, and natural gas is transported to hydrate by flow line 1 and generates jar 10 fast.The cold that evaporimeter 2 obtains is supplied with hydrate and is generated jar 10 fast, and natural gas and the aqueous solution (for example SDS solution of the 300ppm) reaction for preparing in advance generate solid hydrate.After the aqueous solution changed into hydrate fully, closed control valve (F1, F2, F3, F4, F5, F6) was taken snap joint (J1, J2, J3) apart, changed another hydrate and generated jar 10 fast.Hydrate generates jar 10 directly shipment transportations after filling hydrate fast, transports to and specifies the vaporization of hydrate treatment plant.After having vaporized, the hydrate that the aqueous solution is housed is generated jar 10 fast transport back recycling.
Also can adopt the method exploitation of gas hydrate of Fig. 2, the concrete steps of this method are as follows: heat pump 13 changes the Lowlevel thermal energy of seawater into high level heat input sea bottom hydrate reservoir 7, the temperature of hydrate reservoir 7 is decomposed after raising, the natural gas that decomposes is guided to offshore gas platform 14 by adopting natural gas flow line 1, is transported to user by compressing (CNG) or liquefaction (LNG) or changing into after solid hydrate means such as (NGH) are handled natural gas at gas production platform 14.
Fig. 3 is the structural representation that utilizes the inventive method two exploitation sea bed gas hydrates.Identical among the concrete connected mode of heat pump 13 and Fig. 1 in this method.The evaporimeter 2 of heat pump 13 is directly with seawater 15 contacts among Fig. 3.Natural gas flow line 1 is directly received gas production platform 14.
Under the situation of noenergy loss, the energy that obtains from hydrate gas is 15.5 times of decomposition water compound energy.In this example, establishing generating efficiency is 30%, and the heat pump thermal efficiency is 300%, and the hydrate that contains of hydrate reservoir is 50%, and the heat pump leaving water temperature is 60 ℃.If reservoir temperature is 9 ℃, pressure is 10Mpa, reservoir temperature need be heated to 15 ℃, wherein the decomposition enthalpy of hydrate is approximately 53kJ/mol, the specific heat at constant pressure of hydrate is for being about 0.2kJ/ (mol.K), and the hydrate sand specific heat that contains in the hole is about 0.83kJ/kgK, the 6 ℃ of needs 5.0kJ/kg that rise, and (hydrate is pressed CH and the decomposition enthalpy 53kJ/mol of hydrate can be scaled 0.43kJ/kg
46H
2O, molecular weight 124 handle) heat of input is mainly used to heat reservoir and decomposition water compound.
By calculating gained, if the energy that the production of water compound is obtained directly heats hydrate, have 77% to be used for heating hydrate reservoir 7 and decomposition water compound in the energy that the production of water compound obtains, income is 23%.After using heat pump,, can improve energy gain from environment because energy obtains greatly.If improve generating efficiency and capacity usage ratio in this example, for example adopt cogeneration of heat and power, capacity usage ratio brings up to 80%, and then energy gain can bring up to 65%.
Embodiment 1
As shown in Figure 1, the offshore gas platform utilizes the natural gas power of oil or collection to offer heat pump electric energy under water, and heat pump adopts compression heat pump device, and heat pump is made up of evaporimeter 2, expansion valve 3, compressor 4 and condenser 5 etc.Evaporimeter 2, expansion valve 3, compressor 4 and condenser 5 link to each other by pipeline, and refrigeration working medium freon is housed in the pipeline.Evaporimeter 2 connects one and carries cool circulation water pipeline 9, be connected to four control valves (F1, F2, F3, F4) and two snap joints (J1, J2) in the pipeline 9, pipeline 9 generates jar 10 fast by hydrate, hydrate generates jar 10 fast three interfaces, connect circulation line and natural gas flow line 1 respectively, natural gas flow line 1 is equipped with two control valves (F1, F2) and a snap joint J1 too.Heat pump 13 allows refrigeration working medium constantly finish the thermodynamic cycle process of evaporation (draw hydrate and generate heat in jars 10 fast) → compression → condensation (emitting heat) → throttling → evaporate again, thereby in hydrate layer, the energy of heat pump 13 outputs is that compressor 4 works and heat pump generate the heat that absorbs the jar 10 fast from hydrate with the transfer of heat in the environment.The electric energy of this device is provided by the gas production platform, and the automatic control section of device is also in Ground Control, and for device can be moved under water, device has screw and wheel.
Cooling water in the condenser 5 heating outer circulation waterpipes 8, injection hydrate reservoir 7 made decomposition of hydrate after cooling water obtained heat.The cold that evaporimeter 2 obtains is supplied with hydrate and is generated jar 10 fast, and natural gas and 1200ppm alkyl polyglycoside (APG) reactant aqueous solution for preparing in advance generate solid hydrate.After the aqueous solution changed into hydrate fully, closed control valve (F1, F2, F3, F4, F5, F6) was taken snap joint (J1, J2, J3) apart, changed another hydrate and generated jar 10 fast.Hydrate generates jar 10 directly shipment transportations after filling hydrate fast, transports to and specifies the vaporization of hydrate treatment plant.After having vaporized, the hydrate that the aqueous solution is housed is generated jar 10 fast transport back recycling.
The heat pump that the present invention relates to is the known technology of comparative maturity, no longer specifically introduces.
Embodiment 2
Shown in accompanying drawing 2 and 3, the offshore gas platform utilizes the natural gas power of oil or collection to offer heat pump electric energy under water, and heat pump 13 adopts compression heat pump device, and heat pump is made up of evaporimeter 2, expansion valve 3, compressor 4 and condenser 5 etc.Evaporimeter 2, expansion valve 3, compressor 4 and condenser 5 link to each other by pipeline, and refrigeration working medium is housed in the pipeline.Working medium is selected lower boiling working medium freon for use.
Claims (10)
1. the method for an exploitation of gas hydrate may further comprise the steps:
A) high temperature that produces of the hot junction by heat pump (13) heats hydrate reservoir (7):
B) natural gas that decomposites after hydrate reservoir (7) is heated imports hydrate by natural gas flow line (1) and generates jar (10) fast;
C) the cold junction cooling water compound by heat pump (13) generates water and the natural gas in jar (10) fast, makes it to regenerate hydrate;
D) hydrate that hydrate will be housed generates jar (10) fast and directly carries disembarkation;
E) hydrate that generates fast in jar (10) of vaporize water compound obtains natural gas on the coast;
Gas producing device is positioned at the seabed, and generating the hydrate energy needed in recovery process provides by heat pump (13); The electric energy of device is provided by ground gas production platform, and the automatic control section of device is also in Ground Control.
2. the method for a kind of exploitation of gas hydrate according to claim 1 during synthesized hydrate, generates interpolation chemical addition agent in jar (10) fast at hydrate.
3. the method for a kind of exploitation of gas hydrate according to claim 1 and 2, on the coast hydrate is generated fast the hydrate vaporization in jar (10) after, hydrate generates jar (10) fast and transports the seabed back and recycle.
4. the method for an exploitation of gas hydrate may further comprise the steps:
A) high temperature that produces of the hot junction by heat pump in the gas producing device (13) heats the hydrate reservoir;
B) natural gas that decomposites after hydrate reservoir (7) is heated is transported to the gas production platform (14) on sea by natural gas flow line (1);
C) at the gas production platform (14) on sea natural gas is handled, by the compression liquefaction or change into solid hydrate, be delivered to the user then;
Gas producing device is positioned at the seabed, and generating the hydrate energy needed in exploitation, storage and transportation provides by heat pump (13); The electric energy of device is provided by ground gas production platform, and the automatic control section of device is also in Ground Control.
5. the device of an exploitation of gas hydrate is characterized in that: described device is generated jar (10), an outer circulation waterpipe (8) fast, is carried cool circulation water pipeline (9) and constitute by heat pump (13), natural gas flow line (1), hydrate; The two sides that hydrate generates jar (10) fast link to each other with the evaporimeter (2) of heat pump (13) by a cool circulation water pipeline (9) that carries that is provided with control valve and snap joint respectively;
Be provided with control valve (F1), snap joint (J1) and control valve (F2) on the natural gas flow line (1) successively, the one end connects hydrate reservoir (7), and the other end is connected to hydrate and generates jar (10) fast; The condenser (5) of heat pump (13) links to each other with hydrate reservoir (7) by outer circulation waterpipe (8); The electric energy of device is provided by ground gas production platform, and the automatic control section of device is also in Ground Control.
6. the device of a kind of exploitation of gas hydrate according to claim 5, it is characterized in that: described device has power set.
7. the device of a kind of exploitation of gas hydrate according to claim 6, it is characterized in that: described power set are screw and wheel.
8. the device of an exploitation of gas hydrate is characterized in that: described device is made of heat pump (13), natural gas flow line (1), outer circulation waterpipe (8); Be provided with control valve (F1), snap joint (J1) and control valve (F2) on the natural gas flow line (1) successively, the one end connects hydrate reservoir (7), and the other end is connected to the gas production platform (14) on sea; The condenser (5) of heat pump (13) links to each other with hydrate reservoir (7) by outer circulation waterpipe (8); The electric energy of device is provided by ground gas production platform, and the automatic control section of device is also in Ground Control.
9. the device of a kind of exploitation of gas hydrate according to claim 8, it is characterized in that: described device has power set.
10. the device of a kind of exploitation of gas hydrate according to claim 9, it is characterized in that: described power set are screw and wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100772728A CN100386500C (en) | 2004-12-14 | 2004-12-14 | Method and device for extracting natural gas hydrate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100772728A CN100386500C (en) | 2004-12-14 | 2004-12-14 | Method and device for extracting natural gas hydrate |
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| CN1624296A CN1624296A (en) | 2005-06-08 |
| CN100386500C true CN100386500C (en) | 2008-05-07 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434654C (en) * | 2007-02-09 | 2008-11-19 | 中国科学院广州能源研究所 | Cogeneration method for desalinating sea water and exploiting ocean natural gas hydrates |
| CN101392638B (en) * | 2008-11-03 | 2012-04-18 | 中国海洋石油总公司 | Simulating device for solid-state mining experiment of gas hydrate |
| CN103206199B (en) * | 2013-04-15 | 2014-07-23 | 中国石油大学(华东) | Device and method for exploiting natural gas hydrates by means of thermal fluid fracturing |
| CN104196510B (en) * | 2014-09-12 | 2016-08-03 | 哈尔滨工程大学 | Gas hydrates heat shock method reaction unit |
| CN104196508B (en) * | 2014-09-18 | 2016-06-29 | 哈尔滨工程大学 | Gas hydrates Rapid Thermal excites quarrying apparatus |
| CN104841237B (en) * | 2015-04-30 | 2018-06-22 | 华南理工大学 | A kind of apparatus and method of low energy consumption hydration air separation |
| CN106703780B (en) * | 2017-01-05 | 2019-04-16 | 大连理工大学 | A kind of slant well exploiting ocean natural gas hydrates method |
| CN108035699A (en) * | 2017-11-27 | 2018-05-15 | 华南理工大学 | A kind of system and method using seabed geothermal energy in-situ retorting gas hydrates |
| CN110090543B (en) * | 2019-04-03 | 2021-11-09 | 华南理工大学 | Continuous CH separation by fluidized bed4/CO2Method (2) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376462A (en) * | 1981-02-19 | 1983-03-15 | The United States Of America As Represented By The United States Department Of Energy | Substantially self-powered method and apparatus for recovering hydrocarbons from hydrocarbon-containing solid hydrates |
| JPH09158662A (en) * | 1995-12-07 | 1997-06-17 | Power Reactor & Nuclear Fuel Dev Corp | Sea bottom gas hydrate decomposing system |
| WO2003021079A1 (en) * | 2001-08-28 | 2003-03-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for the extraction and transport of gas hydrates and gases from gas hydrates |
| US20030136585A1 (en) * | 2002-01-18 | 2003-07-24 | Tobishima Corporation & Fuji Research Institute Corp. | Device and method for extracting a gas hydrate |
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2004
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376462A (en) * | 1981-02-19 | 1983-03-15 | The United States Of America As Represented By The United States Department Of Energy | Substantially self-powered method and apparatus for recovering hydrocarbons from hydrocarbon-containing solid hydrates |
| JPH09158662A (en) * | 1995-12-07 | 1997-06-17 | Power Reactor & Nuclear Fuel Dev Corp | Sea bottom gas hydrate decomposing system |
| WO2003021079A1 (en) * | 2001-08-28 | 2003-03-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for the extraction and transport of gas hydrates and gases from gas hydrates |
| US20030136585A1 (en) * | 2002-01-18 | 2003-07-24 | Tobishima Corporation & Fuji Research Institute Corp. | Device and method for extracting a gas hydrate |
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