CN103244095A - Supercritical carbon dioxide fracturing method and supercritical carbon dioxide fracturing system - Google Patents
Supercritical carbon dioxide fracturing method and supercritical carbon dioxide fracturing system Download PDFInfo
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- CN103244095A CN103244095A CN2013102205393A CN201310220539A CN103244095A CN 103244095 A CN103244095 A CN 103244095A CN 2013102205393 A CN2013102205393 A CN 2013102205393A CN 201310220539 A CN201310220539 A CN 201310220539A CN 103244095 A CN103244095 A CN 103244095A
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Abstract
The invention discloses a supercritical carbon dioxide fracturing system and a supercritical carbon dioxide fracturing method for producing shale gas. The system comprises a storage tank, a booster pump, a heater, a cooler, a solid separator, a liquid separator, an air compressor and other accessories. The method comprises the steps that sufficient liquid carbon dioxide is stored in the storage tank before fracturing; carbon dioxide is heated to 31.1-120 DEG C by the heater, forms a supercritical state after boosted by the booster pump, and enters a fracturing site through a shaft; and a fractured medium is subjected to solid impurity separation by the solid separator and liquid impurity separation by the liquid separator, is finally cooled by the cooler to the storage temperature of the storage tank, and returns to the storage tank. The fracturing medium of the fracturing method can be recycled, so that the method has a good application prospect.
Description
Technical field
The present invention relates to coal, air to open is adopted technology, is specifically related to a kind of method and system of shale pressure break.
Background technology
Particularly during shale gas, adopt fracturing anatonosis usually, but traditional fracturing method there is following problem at the exploitation tight gas:
1) the water-sensitive phenomenon appears in the fracturing meeting, makes shale expansion, reduces its degree of porosity and permeability;
2) fracturing fluid of fracturing can not directly reclaim, and must add breaking glue solution in the fracturing fluid and just can reclaim, so fracturing fluid reclaims complex process;
3) single port shale gas well uses fracturing to need 15-30 ten thousand t water, and China's gas bearing shale mainly is distributed in the southwest, and the southwest lack of water, so when the exploitation shale gas, select water conservancy pressure break cost higher.
The temperature, pressure that supercritical carbon dioxide refers to fluid is all above a kind of state of 31.1 ℃ of fluid critical-temperatures and critical pressure 7.4MPa.At present supercritical carbon dioxide be mainly used in extracting material, be used as desiccant, as cleaning agent, but supercritical carbon dioxide fluid has gas like lower viscosity and easily high density and the diffluent characteristics of diffusion, liquid concurrently.
The carbon dioxide resource is sufficient, and cost is low, and this application for supercritical carbon dioxide fluid provides good material guarantee.Adopted pure liquid carbon dioxide in " prolong page or leaf 7 wells " on-the-spot crushing test success first in China in 2012, also for using the supercritical carbon dioxide pressure break that on-the-spot feasibility case is provided.
Summary of the invention
The purpose of this invention is to provide a kind of method and system for the supercritical carbon dioxide pressure break of exploiting shale gas, help to improve the oil-gas mining amount.
Technical scheme of the present invention is as follows:
The present invention at first proposes a kind of supercritical carbon dioxide frac system, and it comprises storage tank, heater, booster pump, solid separator separation, liquid separator, air compressor machine, cooler.The delivery outlet of described storage tank connects heater, booster pump successively by pipeline, the output pipe of booster pump puts in pit shaft to the pressure break place, the input port of storage tank connects cooler, air compressor machine, liquid separator and solid separator successively by pipeline and separates, and the intake line that solid separator separates puts in pit shaft to the pressure break place; Pipeline arranges control valve and carries out break-make control between storage tank and heater and storage tank and cooler, in remaining connecting line tee junction is set, and control valve is set; To the pipeline in pressure break place, and solid separator is separated in the pipeline in pressure break place tee junction also is set at booster pump, and control valve is set; Described storage tank dischargeable capacity surpasses 20000L, storing liquid carbon dioxide; The heating-up temperature of heater is 31.1 ℃-120 ℃.
Described tank designs has normal pressure protective device and normal temperature protective device.
The present invention further proposes to adopt described system to carry out the method for supercritical carbon dioxide pressure break, may further comprise the steps:
(1) control valve on the pipeline between storage tank and heater and storage tank and the cooler is opened, remaining control valve of system is closed, allow carbon dioxide be heated to 31.1 ℃-120 ℃ through heater earlier;
(2) carbon dioxide after the heating reaches more than the 7.4MPa by the booster pump supercharging, enters by the sleeve pipe in the pit shaft behind the formation supercritical carbon dioxide and enters the pressure break place, and booster pump also provides frac pressure for pressure break;
(3) after pressure break is finished, medium is that carbon dioxide at first separates separating solids impurity through solid separator with impurity, pass through liquid separator separating liquid impurity again, be cooled to the storage tank stores temperature finally by crossing air compressor Compressed Gas and cooler, return storage tank.
This method adopts the supercritical carbon dioxide pressure break, because supercritical carbon dioxide has gas like lower viscosity concurrently and easily spreads, high density and the diffluent characteristics of liquid, the carbon dioxide resource is sufficient, cost is low, the pressure break medium can recycle, and is a kind of up-and-coming fracturing process for adopting shale gas.
Description of drawings
Fig. 1 is structure principle chart of the present invention.
Among the figure: 1. storage tank; 2. heater; 3. booster pump; 4. pit shaft; 5. pressure break place; 6. solid separator; 7. liquid separator; 8. air compressor; 9. cooler; 10,11,12,13,14,15,16. control valves.
The specific embodiment
As shown in Figure 1, there are storage tank 1, booster pump 2, heater 3, solid separator separation 6, liquid separator 7, air compressor 8, cooler 9 and control valve in system, the delivery outlet of storage tank 1 connects heater 2, booster pump 3 successively by pipeline, the output pipe of booster pump 3 puts in pit shaft 4 to pressure break place 5, the input port of storage tank 1 connects cooler 9, air compressor machine 8, liquid separator 7 successively by pipeline and separates 6 with solid separator, the intake line of solid separator separation 6 puts in pit shaft 4 to pressure break place 5, forms a circulation.Connecting line between above each parts is provided with control valve 10, and to the pipeline in pressure break place, and solid separator separates 6 also be provided with control valve 10 to the pipeline in pressure break place at booster pump 3.
Fracturing process is as follows:
Carbon dioxide reaches more than the 7.4MPa by booster pump 3 superchargings, enters by the sleeve pipe in the pit shaft 4 behind the formation supercritical carbon dioxide and enters pressure break place 5.Booster pump 3 also provides frac pressure for pressure break.
Medium after pressure break is finished at first separates 6 solid impurities through solid separator, passes through liquid separator 7 separating liquid impurity again, is cooled to the storage tank stores temperature finally by crossing air compressor 8 Compressed Gas and cooler 9, returns storage tank 1.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. supercritical carbon dioxide frac system that is used for the exploitation shale gas, it comprises that storage tank (1), heater (2), booster pump (3), solid separator separate (6), liquid separator (7), air compressor machine (8), cooler (9); It is characterized in that, the delivery outlet of described storage tank (1) connects heater (2), booster pump (3) successively by pipeline, the output pipe of booster pump (3) puts in pit shaft (4) to pressure break place (5), the input port of storage tank (1) connects cooler (9), air compressor machine (8), liquid separator (7) successively by pipeline and separates (6) with solid separator, and the intake line that solid separator separates (6) puts in pit shaft (4) to pressure break place (5); Pipeline arranges control valve and carries out break-make control between storage tank (1) and heater (2) and storage tank (1) and cooler (9), in remaining connecting line tee junction is set, and control valve is set; To the pipeline in pressure break place, and solid separator separates (6) and to the pipeline in pressure break place tee junction is set also at booster pump (3), and control valve is set; Described storage tank (1) dischargeable capacity surpasses 20000L, storing liquid carbon dioxide; The heating-up temperature of heater is 31.1 ℃-120 ℃.
2. supercritical carbon dioxide frac system according to claim 1, it is characterized in that: described tank designs has normal pressure protective device and normal temperature protective device.
3. adopt claim 1 or 2 described systems to carry out the method for supercritical carbon dioxide pressure break, it is characterized in that, may further comprise the steps:
(1) control valve on the pipeline between storage tank (1) and heater (2) and storage tank (1) and the cooler (9) is opened, remaining control valve of system is closed, allow carbon dioxide be heated to 31.1 ℃-120 ℃ through heater (2) earlier;
(2) carbon dioxide after the heating reaches more than the 7.4MPa by booster pump (3) supercharging, enters by the sleeve pipe in the pit shaft (4) behind the formation supercritical carbon dioxide and enters pressure break place (5), and booster pump (3) also provides frac pressure for pressure break;
(3) after pressure break is finished, closed control valve, medium is that carbon dioxide at first separates (6) separating solids impurity through solid separator with impurity, pass through liquid separator (7) separating liquid impurity again, be cooled to the storage tank stores temperature finally by crossing air compressor (8) Compressed Gas and cooler (9), return storage tank (1).
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103867166A (en) * | 2014-04-01 | 2014-06-18 | 中国石油大学(华东) | Device and method for supercritical carbon dioxide high-pressure jet flow plug removal seepage enhancement |
| CN104806219A (en) * | 2015-04-13 | 2015-07-29 | 中国石油大学(华东) | Oil and gas reservoir increased permeation and blocking removal device and increased permeation and blocking removal method thereof |
| CN105064975A (en) * | 2015-08-17 | 2015-11-18 | 牛辉英 | Permeability set cement fracturing-production method for unconventional oil and gas layers |
| CN105927202A (en) * | 2016-04-27 | 2016-09-07 | 中国石油天然气股份有限公司 | CO2 recycling and reusing device after gas well CO2 hydrofracture |
| CN106030028A (en) * | 2013-11-21 | 2016-10-12 | 南加州大学 | Fracking with C02 for shale gas reforming to methanol |
| CN106289988A (en) * | 2015-05-29 | 2017-01-04 | 中国科学院地质与地球物理研究所 | Supercritical carbon dioxide rock fracture pilot system |
| CN106285604A (en) * | 2016-11-01 | 2017-01-04 | 中国矿业大学 | A kind of microwave-assisted supercritical carbon dioxide circulation frac system and method |
| CN106382108A (en) * | 2016-10-21 | 2017-02-08 | 河南神华能源工程有限公司 | Fracturing and blockage-removal production increase method for oil-gas well based on CO2 gas phase fracturing technique |
| CN106661930A (en) * | 2014-05-27 | 2017-05-10 | 通用电气公司 | A modular assembly for processing a flowback composition stream and methods of processing the same |
| CN107057674A (en) * | 2017-04-24 | 2017-08-18 | 新疆东大本源石油技术有限公司 | Supercritical carbon dioxide fracturing technology |
| CN107246255A (en) * | 2017-07-26 | 2017-10-13 | 太原理工大学 | Supercritical CO2The analogue means and method of fracturing coal body are combined with hydraulic fracturing |
| CN108760602A (en) * | 2018-05-30 | 2018-11-06 | 辽宁工程技术大学 | Utilize supercritical CO2The pilot system and method for anti-reflection Oil in Super-low Permeability densification shale |
| CN108952659A (en) * | 2018-07-11 | 2018-12-07 | 中国石油大学(北京) | Visualize supercritical carbon dioxide pressure break physical simulation experiment method |
| CN109736767A (en) * | 2019-01-18 | 2019-05-10 | 大庆中联信实石油科技开发有限公司 | A kind of supercritical carbon dioxide fracturing yield increasing technique |
| CN110094188A (en) * | 2019-04-09 | 2019-08-06 | 中国石油集团济柴动力有限公司成都压缩机分公司 | A kind of stepped voltage regulation system and method for supercritical carbon dioxide compressibility |
| CN110331968A (en) * | 2018-03-30 | 2019-10-15 | 中国石油化工股份有限公司 | Simulate the device and method of carbon dioxide dry method pressure break |
| CN115539130A (en) * | 2022-10-28 | 2022-12-30 | 中国矿业大学 | Enhanced coal bed gas exploitation and CO of non-recoverable coal bed 2 Method for sealing |
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| CN106030028A (en) * | 2013-11-21 | 2016-10-12 | 南加州大学 | Fracking with C02 for shale gas reforming to methanol |
| CN103867166B (en) * | 2014-04-01 | 2015-03-11 | 中国石油大学(华东) | Device and method for supercritical carbon dioxide high-pressure jet flow plug removal seepage enhancement |
| CN103867166A (en) * | 2014-04-01 | 2014-06-18 | 中国石油大学(华东) | Device and method for supercritical carbon dioxide high-pressure jet flow plug removal seepage enhancement |
| CN106661930A (en) * | 2014-05-27 | 2017-05-10 | 通用电气公司 | A modular assembly for processing a flowback composition stream and methods of processing the same |
| CN106661930B (en) * | 2014-05-27 | 2020-01-10 | 通用电气公司 | Modular assembly for processing a reflow composite stream and method of processing the reflow composite stream |
| CN104806219A (en) * | 2015-04-13 | 2015-07-29 | 中国石油大学(华东) | Oil and gas reservoir increased permeation and blocking removal device and increased permeation and blocking removal method thereof |
| CN104806219B (en) * | 2015-04-13 | 2017-05-17 | 中国石油大学(华东) | Oil and gas reservoir increased permeation and blocking removal device and increased permeation and blocking removal method thereof |
| CN106289988A (en) * | 2015-05-29 | 2017-01-04 | 中国科学院地质与地球物理研究所 | Supercritical carbon dioxide rock fracture pilot system |
| CN106289988B (en) * | 2015-05-29 | 2019-09-24 | 中国科学院地质与地球物理研究所 | Supercritical carbon dioxide rock fracture pilot system |
| CN105064975A (en) * | 2015-08-17 | 2015-11-18 | 牛辉英 | Permeability set cement fracturing-production method for unconventional oil and gas layers |
| WO2017028559A1 (en) * | 2015-08-17 | 2017-02-23 | 四川行之智汇知识产权运营有限公司 | Permeable cement stone fracturing exploitationmethod forunconventional oil and gas layer |
| CN105064975B (en) * | 2015-08-17 | 2017-09-05 | 牛辉英 | Unconventionaloil pool layer permeable cement stone pressure break recovery method |
| CN105927202A (en) * | 2016-04-27 | 2016-09-07 | 中国石油天然气股份有限公司 | CO2 recycling and reusing device after gas well CO2 hydrofracture |
| CN106382108A (en) * | 2016-10-21 | 2017-02-08 | 河南神华能源工程有限公司 | Fracturing and blockage-removal production increase method for oil-gas well based on CO2 gas phase fracturing technique |
| CN106382108B (en) * | 2016-10-21 | 2019-07-16 | 河南神华能源工程有限公司 | Well fracturing and removal and stimulation method based on CO2 gas phase fracturing technique |
| CN106285604A (en) * | 2016-11-01 | 2017-01-04 | 中国矿业大学 | A kind of microwave-assisted supercritical carbon dioxide circulation frac system and method |
| CN106285604B (en) * | 2016-11-01 | 2019-03-01 | 中国矿业大学 | Microwave-assisted supercritical carbon dioxide cyclic fracturing system and method |
| CN107057674A (en) * | 2017-04-24 | 2017-08-18 | 新疆东大本源石油技术有限公司 | Supercritical carbon dioxide fracturing technology |
| CN107246255A (en) * | 2017-07-26 | 2017-10-13 | 太原理工大学 | Supercritical CO2The analogue means and method of fracturing coal body are combined with hydraulic fracturing |
| CN107246255B (en) * | 2017-07-26 | 2019-03-26 | 太原理工大学 | Supercritical CO2With the simulator and method of the compound fracturing coal body of hydraulic fracturing |
| CN110331968A (en) * | 2018-03-30 | 2019-10-15 | 中国石油化工股份有限公司 | Simulate the device and method of carbon dioxide dry method pressure break |
| CN108760602A (en) * | 2018-05-30 | 2018-11-06 | 辽宁工程技术大学 | Utilize supercritical CO2The pilot system and method for anti-reflection Oil in Super-low Permeability densification shale |
| CN108952659A (en) * | 2018-07-11 | 2018-12-07 | 中国石油大学(北京) | Visualize supercritical carbon dioxide pressure break physical simulation experiment method |
| US10634596B2 (en) | 2018-07-11 | 2020-04-28 | China University Of Petroleum-Beijing | Visualized supercritical carbon dioxide fracturing physical simulation test method |
| CN109736767A (en) * | 2019-01-18 | 2019-05-10 | 大庆中联信实石油科技开发有限公司 | A kind of supercritical carbon dioxide fracturing yield increasing technique |
| CN110094188A (en) * | 2019-04-09 | 2019-08-06 | 中国石油集团济柴动力有限公司成都压缩机分公司 | A kind of stepped voltage regulation system and method for supercritical carbon dioxide compressibility |
| CN110094188B (en) * | 2019-04-09 | 2021-06-01 | 中国石油天然气集团有限公司 | Grading pressure regulating system and method of supercritical carbon dioxide compression system |
| CN115539130A (en) * | 2022-10-28 | 2022-12-30 | 中国矿业大学 | Enhanced coal bed gas exploitation and CO of non-recoverable coal bed 2 Method for sealing |
| CN115539130B (en) * | 2022-10-28 | 2024-02-23 | 中国矿业大学 | Coal seam gas exploitation and CO (carbon monoxide) enhancement of non-shearable layer 2 Sealing method |
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Application publication date: 20130814 |