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Fracture propagation and induced strain response during supercritical CO_(2)jet fracturing

Petroleum Science 2022年第4期19卷 1682-1699页

作者： Can Cai Bang-Run Li Yi-Yao Zhang Wen He Ying-Xin Yang Yong Kang Ji-Wei Wu School of Mechanical Engineering Southwest Petroleum UniversityChengdu610500SichuanP.R.China The State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanP.R.China Shu'nan Gas-Mine of Southwest Oil and Gas Field Company Luzhou646000SichuanP.R.China Hubei Key Laboratory of Waterjet Theory and New Technology Wuhan UniversityWuhan430072HubeiP.R.China School of Engineering and Applied Sciences and Department of Physics Harvard UniversityCambridge02138United States School of Mechanical Engineering Yangtze UniversityJingzhou434023HubeiP.R.China

To investigate fracture generation and strain variation during SC-CO_(2)(supercritical carbon dioxide)jet fracturing,the model of induced strain is established and the experiments are comprehensively studied.The influence factors are comprehensively explored,such as jet pressure,ambient pressure,etc.With the increasing jet pressure,the fracture morphology changes from parallel cracks to oblique cracks.Both the mass loss of specimen and CO_(2) absorption increase significantly,and the growth rate and minimum value of strain also rise exponentially.Under a high ambient pressure of 8.0 MPa,the main fractures mostly propagated from the surface to the bottom surface of the specimen.The maximum strain and the stable duration under higher ambient pressure are 1.5 times and 10 times,respectively,of the case under the ambient pressure of 5.0 MPa.The comparison shows that the optimal jet distance is 5-7 times the nozzle diameter,resulting in massive mass loss,large CO_(2)absorption,and peak strain.Moreover,the nonlinear variation of strain curve during jet pressurization is related to the type of rock and ambient pressure.These studies clearly show the relationship between the fracture morphology and induced strain,which are crucial for SC-CO_(2)fracturing in shale gas reservoirs.

关键词： Supercritical carbon dioxide fracturing Jet fracturing Fracture morphology strain variation

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