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| A method for characterization and identification of gas kicks caused by underbalanced pressure and gravity displacement |
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ZHANG Xingquan1,2, ZHOU Yingcao1, LIU Wei1, GUO Qingfeng1
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(1.CNPC Drilling Research Institute, Beijing 102206, China;2.PetroChina Research Institute of Petroleum Exploration ＆ Development, Beijing 100083, China)
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