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Zhonghua Wu
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Dongying, Shandong, CN
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Patents Grants
last 30 patents
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Patent Grant
Flow splitting device for gas reverse circulation drilling
Patent number
11,946,334
Issue date
Apr 2, 2024
China Petroleum and Chemical Corporation
Chuanwei Zhao
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
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Patent Application
Flow Splitting Device for Gas Reverse Circulation Drilling
Publication number
20230147453
Publication date
May 11, 2023
China Petroleum and Chemical Corporation
Chuanwei ZHAO
E21 - EARTH DRILLING MINING
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Patent Application
Static push-the-bit rotary guiding device
Publication number
20180223599
Publication date
Aug 9, 2018
SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD. DRILLING TECHNOLOGY RESEARCH...
Jinzhou Yang
E21 - EARTH DRILLING MINING