发明名称 Downhole impact wrench
摘要 This invention concerns an impact wrench for breaking a threaded connection between a first section of pipe and a second section of pipe. It includes an arcuate gripping member having an exterior gripping means for gripping the inside of the first section of pipe and an impact tool for directing multiple sudden distinct forces of torque through said gripping means to the first section. It also includes a second arcuate gripping member for gripping the interior of the second section of pipe which is connected to the first and means for the second arcuate gripping member to receive the reaction torque from the impact tool.
申请公布号 US4474244(A) 申请公布日期 1984.10.02
申请号 US19820422108 申请日期 1982.09.23
申请人 STANDARD OIL COMPANY 发明人 BEYNET, PIERRE A.
分类号 E21B17/02;(IPC1-7):E21B31/11 主分类号 E21B17/02
代理机构 代理人
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