CN1587642A - Method and device for sea natural gas hydrate production - Google Patents

Method and device for sea natural gas hydrate production Download PDF

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Publication number
CN1587642A
CN1587642A CNA2004100515432A CN200410051543A CN1587642A CN 1587642 A CN1587642 A CN 1587642A CN A2004100515432 A CNA2004100515432 A CN A2004100515432A CN 200410051543 A CN200410051543 A CN 200410051543A CN 1587642 A CN1587642 A CN 1587642A
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CN
China
Prior art keywords
natural gas
hydrate
silt
decomposer
equipment
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Pending
Application number
CNA2004100515432A
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Chinese (zh)
Inventor
冯自平
郝永卯
黄冲
肖睿
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Guangzhou Institute of Energy Conversion of CAS
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Guangzhou Institute of Energy Conversion of CAS
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Application filed by Guangzhou Institute of Energy Conversion of CAS filed Critical Guangzhou Institute of Energy Conversion of CAS
Priority to CNA2004100515432A priority Critical patent/CN1587642A/en
Publication of CN1587642A publication Critical patent/CN1587642A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0099Equipment 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

Abstract

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.

Description

A kind of method of exploiting ocean natural gas hydrates and device
Technical field
The present invention relates to a kind of exploiting ocean natural gas hydrates method and device.
Background technology
Gas hydrates are high-quality, the clear energy sourcess in a kind of future, and its reserves are suitable with existing earth fossil fuel (oil, natural gas and coal) total carbon, and it will become the most important energy of human 21 century.Successfully carry out the exploitation of gas hydrates, have crucial meaning to alleviating the energy crisis that human society faced, the production technique of gas hydrates has become a world research hot subject at present.
The natural-gas hydrate is mainly contained in the ocean, is the white solid state crystalline material that natural gas forms with the water mutual effect under certain condition.Because the self-characteristic of gas hydrates, its exploitation method is different with the exploitation of conventional energy resource (as coal, oil, natural gas etc.).Coal is solid under mine, is still solid after the exploitation; Oil underground be fluid, be still fluid after the exploitation; And hydrate to bury on the ocean bottom be solid, molecular configuration changes in recovery process, becomes gas from solid.That is to say that hydrate undergoes phase transition in recovery process.The gas hydrates development technique that comprehensive various countries scientist proposes can be divided into two classes substantially: exploitation is decomposed in underground decomposition exploitation and ground.
Underground decomposition exploitation is the activities with reference to oil exploitation, at first in the stratum, form pit shaft, consider how to break artificially the temperature and pressure condition of gas hydrates stable existence then, the hydrate that will contain in deposit decomposes, and natural gas is adopted to ground at last again.Mainly comprise: (1) heating is that steam, hot water, hot salt brine or other hot fluid are pumped into the gas hydrates reservoir from ground, impels temperature to rise and reaches the decomposition of hydrate; (2) voltage drop method is by reducing moving of phase equilibrium line that pressure causes that gas hydrates are stable, thereby reaches the purpose of impelling gas hydrates to decompose; (3) chemical agent method, chemical agents such as salt solution, methyl alcohol, ethanol are pumped into the stratum from wellhole after, can change the phase balance condition that hydrate forms, reduce the hydrate equilibrium temperature, cause the decomposition of gas hydrates.For underground decomposition exploitation, be easy to form reasons such as hydrate obstruction in, the pipeline very long owing to the pipeline of the instability of continental slope, laying, can produce certain technology and economic problems.Simultaneously, more than various production techniques itself limitation is all arranged, big as the heating heat waste, efficient is low, the voltage drop method exploitation rate is slow, chemical agent method expense costliness etc.More than these factors, all might make people be difficult to utilize this means to come the exploitation of gas hydrate resource.
Decompose exploitation on the ground and be meant under the situation that gas hydrates are decomposed, gas hydrates are transported to decompose exploitation on the land.A new gas hydrates development approach is to make gas hydrate particleization at the deep-sea; or gas hydrates are packed in a kind of expandable soft airbag (its inner keep gas hydrates stablize needed temperature and pressure condition); with submarine gas hydrates are dragged near the continental shelf shallow water area again; there; gas hydrates can decompose lentamente, produce fuel and water.Perhaps can develop a kind of additive from now on, gas hydrates can be stablized under lower pressure and higher temperature.If can accomplish these, gas hydrates transport on traditional boats and ships that get up may be than the natural gas safety also of liquefaction.Though decompose some shortcomings that exploitation has overcome underground decomposition exploitation on the ground, only be a kind of imagination also at present, also have many difficult problems to overcome, the actual mining site of distance is used also has suitable distance.
In sum, up to the present, also there be not a kind of the concrete of exploitation of gas hydrate and effective method of can being used for.The method that present stage is paid close attention to has: the gas that inject hot water, reduce reservoir pressure, injecting inhibitor, injection can not form hydrate, adopt microwave technology etc.The actual still controversial Russian Siberian Mai Suoya field of breathing out of having only of putting into production utilizes the method for step-down and injecting inhibitor to produce 20 years.Be used for from making of above each method, it is uneconomic only adopting a certain method to come exploitation of gas hydrate, has only advantage in conjunction with distinct methods just can reach cost-effective exploitation to gas hydrates.
In view of above reason, the present invention minute is considering underground decomposition exploitation and is decomposing on the ground on the advantage and not enough basis of exploitation, a kind of economy, the method and the device of large scale mining ocean gas hydrate have efficiently been proposed, for the exploitation of hydrate opens up a new way.
Summary of the invention
The purpose of this invention is to provide a kind of economy, the method and the device of large scale mining ocean gas hydrate efficiently.
The objective of the invention is to be achieved through the following technical solutions:
The inventive system comprises drilling equipment, silt eliminator, hydrate decomposition device, natural gas derivation pipeline and various conveyance conduit.Described drilling equipment is included in the rig of the mixture of exploitation generation hydrate, silt and decomposition gas in the stratum.Described silt eliminator is positioned at the seabed, is used for the silt of the mixture of hydrate, silt and decomposition gas is separated.Described hydrate decomposition device is positioned at the sea, is used to import the higher seawater of the temperature of ocean surface with the decomposition water compound.
Method of the present invention and device operating principle are to use rig that the sea bottom hydrate layer is exploited, with the mixture of hydrate, silt and decomposition gas be discharged to be positioned at the seabed silt separation apparatus with separation of sediment.Be transported to the decomposer that is positioned on the sea with the mixture of hydrate, decomposition gas and water after silt separates by pipeline, isolated silt is then stayed the seabed.Like this, carry the power that needs to reduce greatly.
The working method of decomposer is: the higher seawater of temperature that extracts ocean surface, feed from the bottom of decomposer, and the mixture of hydrate that comes from the seabed and seawater is from the middle part or the top importing of decomposer, like this, hydrate is suspended state decline after entering this decomposer, in the process that descends, dissolved decomposition, decompose the gas that produces and rise to the decomposer top, enter gas pipeline by the higher seawater of temperature that comes from the bottom.The top of decomposer is provided with outlet pipe, is used for draining.
The water inlet pipe of decomposer and outlet pipe can be roots at the most.
The gas outlet of deriving pipeline at natural gas can be provided with water capturing installation or other drying devices, is used for removing the moisture of natural gas.
Method and apparatus of the present invention, overcome the drawback of existing exploiting ocean natural gas hydrate the whole bag of tricks preferably, equipment is simple, easy to operate, with low cost, high efficiency, can be applied to exploiting ocean natural gas hydrate on a large scale, find a new way for the mankind utilize the ocean natural gas resource on a large scale.
Description of drawings
Fig. 1 is the fundamental diagram of one embodiment of the invention.
The specific embodiment
Below in conjunction with accompanying drawing content of the present invention is further specified:
Device of the present invention comprises with the lower part:
1, drill bit 2, rig 3, mixture channel 4, silt separation equipment 5, pipeline 6, decomposition jar 7, seawater input channel 8, seawater output channel 9, natural gas output channel 10, pump 11, pump 12, pump
As shown in Figure 1, stretching into drill bit 1 at the sea bed gas hydrate layer exploits, with the mixture of hydrate, silt and decomposition gas by row of conduits to the silt separation apparatus 4 that is positioned at the seabed, the mixture of the hydrate after the separation, decomposition gas and water is transported to the decomposition jar 6 that is positioned on the sea by pipeline 5, pump 10 seawater that the temperature on sea is higher decomposes jar 6 through pipeline 7 inputs, the natural gas via pipeline 9 that decomposites is derived, and used seawater exports the sea to again through pipeline 8.

Claims (9)

1, a kind of exploiting ocean natural gas hydrates method is characterized in that may further comprise the steps:
(1) seabed natural gas hydrate layer is exploited, produce hydrate, silt and decomposition gas mixture and on be discharged to the seabed;
(2) silt separates in the seabed, and will be sent to the decomposer that is positioned at the sea level with the mixture of natural gas hydrate, decomposition gas and water after silt separates;
(3) the higher seawater of temperature on importing sea level is used for decomposing in decomposer;
(4) natural gas and the seawater after the separation derived respectively.
2, exploiting ocean natural gas hydrates method as claimed in claim 1 is characterized in that the mixture that contain hydrate next from the seabed enters decomposer from the top of the higher seawater of the temperature described in the step (3).
3, a kind of exploiting ocean natural gas hydrates equipment comprises natural gas derivation pipeline, it is characterized in that also comprising drilling equipment, silt eliminator, hydrate decomposition device; Described drilling equipment is included in the drill bit and the rig of the mixture of exploitation generation hydrate, silt and decomposition gas in the stratum; Described silt eliminator is positioned at the seabed, is used for the silt of mixture is separated; Described hydrate decomposition device is positioned at the sea, is used to import the higher seawater of the temperature of ocean surface with the decomposition water compound.
4, exploiting ocean natural gas hydrates equipment according to claim 3 is characterized in that: the higher seawater of the temperature that imports from the sea level enters from the bottom of decomposer, discharges from top.
5, exploiting ocean natural gas hydrates equipment according to claim 3 is characterized in that: described natural gas is derived the top that pipeline is positioned at decomposer.
6, according to claim 3 or 5 described exploiting ocean natural gas hydrates equipment, it is characterized in that: gas outlet, described natural gas delivery line road is provided with water capturing installation.
7, according to claim 3 or 5 described exploiting ocean natural gas hydrates equipment, it is characterized in that: gas outlet, natural gas delivery line road is provided with drying device.
8, according to claim 3 or 4 or 5 described exploiting ocean natural gas hydrates equipment, it is characterized in that: the mixture that contains hydrate that comes from the seabed enters decomposer from the middle part of decomposer.
9, according to claim 3 or 4 or 5 described exploiting ocean natural gas hydrates equipment, it is characterized in that: the mixture that contains hydrate that comes from the seabed enters decomposer from the top of decomposer.
CNA2004100515432A 2004-09-21 2004-09-21 Method and device for sea natural gas hydrate production Pending CN1587642A (en)

Priority Applications (1)

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CNA2004100515432A CN1587642A (en) 2004-09-21 2004-09-21 Method and device for sea natural gas hydrate production

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Application Number Priority Date Filing Date Title
CNA2004100515432A CN1587642A (en) 2004-09-21 2004-09-21 Method and device for sea natural gas hydrate production

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CN1587642A true CN1587642A (en) 2005-03-02

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Cited By (11)

* Cited by examiner, † Cited by third party
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
CN100449117C (en) * 2005-10-31 2009-01-07 中国科学院广州能源研究所 Extracting and conveying method and device of sea-bottom natural gas hydrate
CN101555797B (en) * 2009-05-19 2011-08-03 四川大学 Extraction device for undersea gas hydrate and extraction method thereof
CN103352676A (en) * 2013-07-08 2013-10-16 赵颖寅 Device and method for exploiting submarine combustible ice
CN104453794A (en) * 2014-11-20 2015-03-25 中国科学院广州能源研究所 Simulation experiment system for whole process of natural gas hydrate exploitation and simulation method
CN104929601A (en) * 2015-06-03 2015-09-23 华北理工大学 Variable-frequency vibration exploitation method of offshore gas hydrate
CN104927950A (en) * 2015-04-15 2015-09-23 辽宁石油化工大学 Method and device for processing natural gas hydrate slurry in submarine pipeline
WO2016133480A1 (en) * 2015-02-16 2016-08-25 Göksel Osman Zühtü A system and a method for exploitation of gas from gas hydrate formations
CN106896214A (en) * 2017-03-07 2017-06-27 西南石油大学 The experimental provision that a kind of simulated pressure influences on natural gas hydrate stratum crack
CN109403944A (en) * 2018-12-06 2019-03-01 青岛海洋地质研究所 A kind of hydrate mortar thickening separator and separation method
US10683736B2 (en) 2018-01-08 2020-06-16 Guangzhou Institute Of Energy Conversion, Chinese Academy Of Sciences Method and system for recovering gas in natural gas hydrate exploitation

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100449117C (en) * 2005-10-31 2009-01-07 中国科学院广州能源研究所 Extracting and conveying method and device of sea-bottom natural gas hydrate
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
CN101555797B (en) * 2009-05-19 2011-08-03 四川大学 Extraction device for undersea gas hydrate and extraction method thereof
CN103352676A (en) * 2013-07-08 2013-10-16 赵颖寅 Device and method for exploiting submarine combustible ice
CN103352676B (en) * 2013-07-08 2015-09-16 赵光书 The quarrying apparatus of a kind of seabed combustible ice and exploitation method
CN104453794A (en) * 2014-11-20 2015-03-25 中国科学院广州能源研究所 Simulation experiment system for whole process of natural gas hydrate exploitation and simulation method
CN104453794B (en) * 2014-11-20 2017-05-17 中国科学院广州能源研究所 Simulation experiment system for whole process of natural gas hydrate exploitation and simulation method
WO2016133480A1 (en) * 2015-02-16 2016-08-25 Göksel Osman Zühtü A system and a method for exploitation of gas from gas hydrate formations
WO2016133470A1 (en) * 2015-02-16 2016-08-25 Göksel Osman Zühtü A system and a method for exploitation of gas from gas-hydrate formations
US10927656B2 (en) 2015-02-16 2021-02-23 Osman Zuhtu Goksel System and a method for exploitation of gas from gas hydrate formations
CN104927950A (en) * 2015-04-15 2015-09-23 辽宁石油化工大学 Method and device for processing natural gas hydrate slurry in submarine pipeline
CN104929601A (en) * 2015-06-03 2015-09-23 华北理工大学 Variable-frequency vibration exploitation method of offshore gas hydrate
CN106896214A (en) * 2017-03-07 2017-06-27 西南石油大学 The experimental provision that a kind of simulated pressure influences on natural gas hydrate stratum crack
CN106896214B (en) * 2017-03-07 2019-08-02 西南石油大学 A kind of experimental provision that simulated pressure influences natural gas hydrate stratum crack
US10683736B2 (en) 2018-01-08 2020-06-16 Guangzhou Institute Of Energy Conversion, Chinese Academy Of Sciences Method and system for recovering gas in natural gas hydrate exploitation
CN109403944A (en) * 2018-12-06 2019-03-01 青岛海洋地质研究所 A kind of hydrate mortar thickening separator and separation method

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