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Dongying, CN
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Patents Grants
last 30 patents
Information
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
Information
Patent Grant
Apparatus for tripping oil pipe and system for automatic well workover
Patent number
9,732,570
Issue date
Aug 15, 2017
China Petroleum and Chemical Corporation
Minxuan Wang
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
Information
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
Information
Patent Application
Apparatus for Tripping Oil Pipe and System for Automatic Well Workover
Publication number
20150197997
Publication date
Jul 16, 2015
China Petroleum and Chemical Corporation
Minxuan WANG
E21 - EARTH DRILLING MINING