Inventor

TANG QIANWEN

CN2 patents

Patents

2 patents

US9932784B2Apr 3, 2018

Device for handling oil pipes and method for workover

CHINA PETROLEUM & CHEM CORP8 citations76

US9732570B2Aug 15, 2017

Apparatus for tripping oil pipe and system for automatic well workover

CHINA PETROLEUM & CHEM CORP0 citations31