Hongning Zhang

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Qingdao City, CN

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Patents Grantslast 30 patents

Information Patent Grant
Method and system for improving drilling speed by using drill speed...
- Patent number 9,540,881
- Issue date Jan 10, 2017
- CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)
- Zhichuan Guan
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
METHOD AND SYSTEM FOR IMPROVING DRILLING SPEED BY USING DRILL SPEED...
- Publication number 20140166368
- Publication date Jun 19, 2014
- China University of Petroleum (East China)
- Zhichuan Guan
- E21 - EARTH DRILLING MINING