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《Fault-Block Oil & Gas Field》 2018-03
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Relationship between shale horizontal well track orientation and bedding plane occurrence

XIA Hongquan;SHI Yahong;WANG Hanwei;ZHAO Hao;ZHU Weihou;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University;Shunan Gas Field,Southwest Oil & Gas Field Company,PetroChina;Engineering Management Department,Zhongyuan Oilfield Company,SINOPEC;  
It is effective to prevent the collapse of the borehole wall and save the drilling cost by accurately grasping the influence of the bedding surface on the selection of the well trajectory of the shale horizontal well. Triaxial compression experiment was carried out on the core of the Longmaxi Formation in the Changning Block, and the calculation method of collapse pressure of shale horizontal well was established based on the single weak shear failure criterion and the shale horizontal well wall stress distribution model. Based on the logging data of shale horizontal well and the experimental data of rock mechanics, the influence law of bedding plane occurrence on the collapse pressure of shale horizontal well borehole was obtained. It is found that when the shale bedding dip is constant, the collapse pressure equivalent density range of shale horizontal wall gradually broadens with the increase of bedding dip angle. When the dip angle of the bedding plane is less than 45°, shearing failure will occur on bedding plane of rock wall; when the dip angle of the bedding plane is more than 45°, the body of the rock will be destroyed; when the body of the rock is destroyed,the shale horizontal well is drilled in the opposite direction along the bedding plane, which is favorable for the wellbore stability.
【Fund】: 国家重点基础研究发展计划(973计划)项目“页岩气水平井钻完井关键技术研究”(2013CB228003)
【CateGory Index】: TE243
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