Simulating device and method for combined fracturing of coal body by supercritical CO2 and hydraulic fracturing
A technology for hydraulic fracturing and simulating devices, which is applied in the fields of fluid extraction, earthwork drilling, and other gas emission reduction technologies, can solve problems such as imperfect experimental devices, and achieve the promotion of water migration, good economy, and increased The effect of coal fissures
Active Publication Date: 2019-03-26
TAIYUAN UNIV OF TECH
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Problems solved by technology
[0004] At present, there are few researches on supercritical carbon dioxide and hydraulic fracturing combined fracturing of coal in various countries, and the relevant experimental devices are not perfect
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Embodiment 1
[0029] like figure 1 , coal mine supercritical CO 2 Combined fracturing coal simulating device with hydraulic fracturing, including sealed tank device 1, supercritical CO 2 Combined with hydraulic fracturing fracturing device 2, data acquisition device 3, vacuum pump 4, gas sample tank 5 and safety valve 6; the supercritical CO 2 Combined fracturing device with hydraulic fracturing 2 including supercritical CO 2 Fracturing section (consisting of components 2-1, 2-2, 2-3, 2-4) and hydraulic fracturing section (consisting of components 2-5, 2-6, 2-7, 2-8, 2-9 Composition); the coal sample 7 is placed in the sealed tank device 1; the safety valve 6 can prevent the sealed tank device 1 from causing an accident due to excessive pressure in the chamber; the supercritical CO 2 Combined with hydraulic fracturing fracturing device 2, the supercritical CO 2 The fracturing device and the hydraulic fracturing device are directly connected to the coal sample 7 of the sealed tank device...
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The invention discloses a simulation device and method of a supercritical CO2 and hydraulic composite fracturing medium; the simulation device comprises a supercritical CO2 and hydraulic composite fracturing device, a sealed tank device, a data acquisition device, a vacuum pump, a gas sample tank and a safety valve; the supercritical CO2 and hydraulic composite fracturing device comprises a supercritical CO2 fracturing portion and a hydraulic fracturing portion; a coal sample is arranged in a tank body of the sealed tank device; the data acquisition device, the vacuum pump and the gas sample tank are directly connected with the coal sample. The sealed tank is vacuumized by the vacuum pump; uniaxial pressurizing is achieved by extruding the coal sample with a presser; the coal sample is subjected to composite fracturing according to experimental requirements; experimental data are acquired and analyzed to obtain the effect of the underground coal mine supercritical carbon dioxide and hydraulic composite fracturing. Underground coal seam peripheral stress and gas occurrence conditions are truly simulated by a similar simulation method, and data are more scientific, precise and reliable.
Description
technical field [0001] The present invention relates to a kind of supercritical CO 2 A simulation device and method for fracturing coal bodies combined with hydraulic fracturing, in particular to an experimental simulation device and method for combining supercritical carbon dioxide and hydraulic fracturing in coal mines for fracturing coal bodies. Background technique [0002] In recent years, my country's coal mine accidents have occurred from time to time, among which gas accidents account for more than 80% of the total accidents. Gas disasters are an important problem that seriously restricts the safe and efficient production of coal mines. At present, one of the most effective measures to solve gas disasters is gas drainage. With the increase of coal mining depth, the problems of high coal seam gas pressure and low permeability coal seams will become more and more obvious, and the effect of single hydraulic fracturing measures will become worse and worse, making it dif...
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IPC IPC(8): E21B43/16E21B43/26
CPCY02P90/70
Inventor 姜海纳段传旭孟文盛李佳晨曹慧智张晓俊徐乐华冯国瑞胡胜勇李振高强崔家庆宋诚
Owner TAIYUAN UNIV OF TECH