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Practice of accurate construction of ' water stopper ' advanced treatment of karst collapse column in multi- branch horizontal wells
Luojiangfa1, Ding Tongfu2, Wang Minhua1, Zhu Changhuai3, Wen Dongming2, Chen Xiaolei2
1. Huainan Mining Group Coal Company, Huainan 232095; 2. Huainan Mining Group Geological Exploration Branch, Huainan 232052; 3. Gubei Coal Mine, Huaizhe Coal and Electricity Company Huainan 232150, China


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