CN103573233A - Method and device for exploiting natural gas hydrate in cryolithozone - Google Patents
Method and device for exploiting natural gas hydrate in cryolithozone Download PDFInfo
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- CN103573233A CN103573233A CN201310590878.0A CN201310590878A CN103573233A CN 103573233 A CN103573233 A CN 103573233A CN 201310590878 A CN201310590878 A CN 201310590878A CN 103573233 A CN103573233 A CN 103573233A
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Abstract
With the development of economy in recent years, the demand for energy increases continuously, and the value of exploitation of natural gas hydrate becomes particularly important gradually. The method and technology for exploiting the natural gas hydrate has been under continuous improvement and perfection. The invention provides a method and device for exploiting the natural gas hydrate in a cryolithozone. According to the method and device for exploiting the natural gas hydrate in the cryolithozone, the reaction contact area is increased by means of the fracturing technology, and then exploiting efficiency and the exploiting rate are improved; due to the fact that the density of N2 is larger than the density of natural gas, when N2 is injected into a well, natural gas obtained from hydrate decomposition is effectively discharged. The method is an effective method for exploiting the natural gas hydrate.
Description
Technical field
The present invention relates to a kind of exploitation method of gas hydrates, is a kind of N
2the method of underground replacement exploitation of gas hydrate.Belong to field of energy source developing technology.
Background technology
Along with the continuous research to gas hydrates, its exploitation method has become the large technical bottleneck of this problem one, and the quality of exploitation method has directly affected gas hydrates benefit and the energy and has been worth.Good exploitation method can be taken into account and accomplish neither local geographical environment to be worked the mischief in production of resources to greatest extent, also can not damage geologic structure, can not have potential harm of later stage.This device is just according to principle above, for when reaching exploitation of gas hydrate, and N
2vacancy when having filled up original natural gas and existing, can be because of the problem such as cause that geology is subsided after exploiting.
Summary of the invention
The present invention utilizes N
2natural gas method and device that this stable chemical nature and the large gas of density ratio natural gas density come displacer gas decomposition of hydrate to go out.Made up the underground geology causing because the tapping natural gas series of problems such as subside.
This device reduces borehole pressure by compressor, so that the decomposition of gas hydrates, the little setting value that arrives of pressure in well, its sniffer transfers data to data acquisition and processing (DAP) system, and now end cap is opened, N
2in Injection Well, the pressure while making pressure in well return to firm exploitation.Natural gas and N
2in gas fractionation unit, after separation, natural gas can offer user, and N
2pass through hydraulic means and liquefy N
2be stored in storage tank, in order to re-injecting in well, thereby realize N
2recycle.
Accompanying drawing explanation
Fig. 1 N
2underground replacement exploitation of gas hydrate device schematic diagram
The specific embodiment
Below in conjunction with drawings and the embodiments, patent of the present invention is described in further detail:
Patent of the present invention is specifically related to a kind of based on N
2replace underground gas hydrates method and apparatus, the specific embodiment is: the initial stage of production of 1., stop up plug, the natural gas decompositing because of fracturing fracture in recovery well well head compressor operating out well, now at recovery well, horizontal well and Injection Well hypomere, form a vacuum, now along with the reduction of pressure, gas hydrates decompose in a large number, its product is constantly extracted out by compressor, detection instrument imports the pressure in well and temperature data into data acquisition and processing (DAP) system, by natural gas P-V-T gas equation, draws the difference with set condition pressure values; 2. when this difference surpasses capping, its extraction well well head compressor quits work, and Injection Well end cap is opened, and N now liquefies
2holding vessel outlet valve is opened, N
2after gasification, by Injection Well well head compressor, be injected in well; 3. along with N
2the pressure injecting into well recover gradually initially, until during initial pressure, liquefaction N
2outlet valve is closed, and end cap is closed; 4. due to N
2density ratio natural gas density is large, works as N
2in the time of in Injection Well, can discharge natural gas in well in maximum ground; When 5. in well, pressure returns to initial pressure, the work of extraction well well head compressor starts, now starts again to enter step 1.; 6. the mist of extraction enters after gas fractionation unit processing, and isolated natural gas can be collected in natural gas storage tanks for user after natural gas filter; 7. isolated N
2after liquefying plant, liquefy, be stored in N
2in liquefied pot, prepare against and recycle.
The device adopting in method comprises: N
2supplement car (1); Gas control valve (2); N
2liquefying plant (3); Liquefaction N
2holding vessel (4); Natural gas storage tanks (5); Natural gas filter (6); Gas fractionation unit (7); Compressor (8); Data acquisition and processing (DAP) system (9); Detection instrument (10); Recovery well (11); Horizontal well (12); Injection Well (13); End cap (14); Compressor (15); Well mouth sealing device (16); Pressure break parting (17); Gas hydrates layer (18).
Mining system of the present invention is manufactured economical clean, to fresh groundwater, can not pollute threat, splits fief matter and can not cause potential harm of later stage, splits fief matter also without specific (special) requirements simultaneously, is applicable to tundra and region, deep-sea exploitation of gas hydrates.It is theoretical foundation that gas hydrates step-down extraction system is take in the present invention, on to simple step-down exploitation method major tuneup basis, realizes and notes N
2carry out the method for replacement exploitation of gas hydrate.Be widely used in the exploitation of the many sea areas in tundra and China gas hydrates such as China Qinghai-Tibet Platean.For solving China energy problem, provide a kind of method of the effective and exploitation of gas hydrate that cost is relatively low, reliable.
Claims (5)
1. exploit a method and apparatus for permafrost region gas hydrates, the device adopting in method comprises: N
2supplement car (1); Gas control valve (2); N
2liquefying plant (3); Liquefaction N
2holding vessel (4); Natural gas storage tanks (5); Natural gas filter (6); Gas fractionation unit (7); Compressor (8); Data acquisition and processing (DAP) system (9); Detection instrument (10); Recovery well (11); Horizontal well (12); Injection Well (13); End cap (14); Compressor (15); Well mouth sealing device (16); Pressure break parting (17); Gas hydrates layer (18).Recovery features is its step: the initial stage of production of 1., stop up plug, the natural gas decompositing because of fracturing fracture in recovery well well head compressor operating out well, now at recovery well, horizontal well and Injection Well hypomere, form a vacuum, now along with the reduction of pressure, gas hydrates decompose in a large number, its product is constantly extracted out by compressor, detection instrument imports the pressure in well and temperature data into data acquisition and processing (DAP) system, by natural gas P-V-T gas equation, draws the difference with set condition pressure values; 2. when this difference surpasses capping, its extraction well well head compressor quits work, and Injection Well end cap is opened, and N now liquefies
2holding vessel outlet valve is opened, N
2after gasification, by Injection Well well head compressor, be injected in well; 3. along with N
2the pressure injecting into well recover gradually initially, until during initial pressure, liquefaction N
2outlet valve is closed, and end cap is closed; 4. due to N
2density ratio natural gas density is large, works as N
2in the time of in Injection Well, can discharge natural gas in well in maximum ground; When 5. in well, pressure returns to initial pressure, the work of extraction well well head compressor starts, now starts again to enter step 1.; 6. the mist of extraction enters after gas fractionation unit processing, and isolated natural gas can be collected in natural gas storage tanks for user after natural gas filter; 7. isolated N
2after liquefying plant, liquefy, be stored in N
2in liquefied pot, prepare against and recycle.
2. a kind of method and apparatus of exploiting permafrost region gas hydrates described in claim 1, it is characterized in that: it has increased the decomposition area of gas hydrates pressure break parting, the reason that its pressure break slight crack produces is in horizontal well cutting process, at large hydrate tomography machinery, beat or hole, then inject fracturing fluid, make gas hydrates layer produce a large amount of pressure break slight cracks.
3. a kind of method and apparatus of exploiting permafrost region gas hydrates described in claim 1, is characterized in that: N
2from Injection Well, enter well, guaranteed original pressure of well, make in recovery well not can be because of the extraction internal pressure of natural gas too small and cause and subside.N
2injection made up the space that natural gas is discharged.
4. a kind of method and apparatus of exploiting permafrost region gas hydrates described in claim 1, is characterized in that: select N
2advantage as substitution gas has: 1. N
2larger than natural gas density, can effectively discharge natural gas in well; 2. N
2safety and wide material sources, to obtain; 3. N
2inorganic gas as a kind of stable chemical nature, is warm and is of quite diverse character at physics and chemistry with organic gas, for gas separation creates favorable conditions.
5. a kind of method and apparatus of exploiting permafrost region gas hydrates described in claim 1, is characterized in that: use liquefaction N
2to consider liquefaction N
2condition ratio is easier to, and with respect to manufacturing large-scale gaseous state N
2holding vessel, liquefaction N
2cost is lower and save to take up an area space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310590878.0A CN103573233A (en) | 2013-11-21 | 2013-11-21 | Method and device for exploiting natural gas hydrate in cryolithozone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310590878.0A CN103573233A (en) | 2013-11-21 | 2013-11-21 | Method and device for exploiting natural gas hydrate in cryolithozone |
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| CN103573233A true CN103573233A (en) | 2014-02-12 |
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| CN201310590878.0A Pending CN103573233A (en) | 2013-11-21 | 2013-11-21 | Method and device for exploiting natural gas hydrate in cryolithozone |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422056A (en) * | 2016-01-26 | 2016-03-23 | 辽宁石油化工大学 | Method for mining natural gas hydrate in deep seafloor through carbon dioxide method |
| CN105715236A (en) * | 2014-08-12 | 2016-06-29 | 成都能生材科技开发有限责任公司 | Environment friendliness and low-pressure super-cold liquefaction combined mining technology for combustible ice well network |
| CN106401463A (en) * | 2016-10-25 | 2017-02-15 | 西南石油大学 | Drilling system and method for improving tundra drilling efficiency |
| CN106761607A (en) * | 2017-02-20 | 2017-05-31 | 华南理工大学 | A kind of method and device of the auxiliary Hot swapping exploitation of gas hydrate of flue gas |
| CN107676069A (en) * | 2017-10-23 | 2018-02-09 | 大庆东油睿佳石油科技有限公司 | A kind of device for simulating the exploitation of gas hydrates parallel water horizontal well chemical flooding |
| CN108318655A (en) * | 2018-01-25 | 2018-07-24 | 广州海洋地质调查局 | Liquid nitrogen frozen hydrate sample decomposes gas quantitative sample injection system |
| CN109488260A (en) * | 2018-12-17 | 2019-03-19 | 吉林大学 | The method that exploitation of gas hydrates efficiency is improved using fracturing fluid containing expansion-resisting agent |
| CN109736769A (en) * | 2019-01-15 | 2019-05-10 | 中国矿业大学 | A kind of frozen soil layer gas hydrates horizontal branch well pattern mining system and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105715236A (en) * | 2014-08-12 | 2016-06-29 | 成都能生材科技开发有限责任公司 | Environment friendliness and low-pressure super-cold liquefaction combined mining technology for combustible ice well network |
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| CN105422056A (en) * | 2016-01-26 | 2016-03-23 | 辽宁石油化工大学 | Method for mining natural gas hydrate in deep seafloor through carbon dioxide method |
| CN106401463A (en) * | 2016-10-25 | 2017-02-15 | 西南石油大学 | Drilling system and method for improving tundra drilling efficiency |
| CN106401463B (en) * | 2016-10-25 | 2018-07-06 | 西南石油大学 | A kind of well system and its method for improving frozen soil layer drilling efficiency |
| CN106761607A (en) * | 2017-02-20 | 2017-05-31 | 华南理工大学 | A kind of method and device of the auxiliary Hot swapping exploitation of gas hydrate of flue gas |
| CN107676069A (en) * | 2017-10-23 | 2018-02-09 | 大庆东油睿佳石油科技有限公司 | A kind of device for simulating the exploitation of gas hydrates parallel water horizontal well chemical flooding |
| CN108318655A (en) * | 2018-01-25 | 2018-07-24 | 广州海洋地质调查局 | Liquid nitrogen frozen hydrate sample decomposes gas quantitative sample injection system |
| CN108318655B (en) * | 2018-01-25 | 2023-09-26 | 广州海洋地质调查局 | Liquid nitrogen frozen hydrate sample decomposition gas quantitative sampling system |
| CN109488260A (en) * | 2018-12-17 | 2019-03-19 | 吉林大学 | The method that exploitation of gas hydrates efficiency is improved using fracturing fluid containing expansion-resisting agent |
| CN109488260B (en) * | 2018-12-17 | 2020-12-11 | 吉林大学 | Method for improving exploitation efficiency of natural gas hydrate by using fracturing fluid containing anti-swelling agent |
| CN109736769A (en) * | 2019-01-15 | 2019-05-10 | 中国矿业大学 | A kind of frozen soil layer gas hydrates horizontal branch well pattern mining system and method |
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Application publication date: 20140212 |