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Yongjin Cha
Yongjin Cha
Drilling
Well drilling
Materials science
Engineering
Structural engineering
4
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Method, device and equipment for injecting gas into stratums
2017
Yongsheng Wang
Yongjin Cha
chenmaoshan
Wenxin Bi
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Rotating storage tank device for abrasive
2014
Yi Zhou
Haige Wang
Yongjin Cha
Rongchao Cheng
Guodong Ji
xuyiji
Ruiying Wang
Jianbo Li
liqinglu
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Foaming agent for well drilling under high temperature environment
2013
Xiaoqing Lai
Yinao Su
Yingmin Li
yanghenglin
Yongjin Cha
liumeiquan
danzhengming
luliqiang
Fabing Deng
liyanqin
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Resonant pulse vibrating drilling device
2011
cuilonglian
zhangfucheng
Haige Wang
Lubin Zhuo
Yongjin Cha
Zhixue Chen
Li Liu
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