Invention Grant
- Patent Title: Circulation and rotation tool
- Patent Title (中): 循环和旋转工具
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Application No.: US13085039Application Date: 2011-04-12
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Publication No.: US08826992B2Publication Date: 2014-09-09
- Inventor: Shaohua Zhou
- Applicant: Shaohua Zhou
- Applicant Address: SA Dhahran
- Assignee: Saudi Arabian Oil Company
- Current Assignee: Saudi Arabian Oil Company
- Current Assignee Address: SA Dhahran
- Agency: Bracewell & Giuliani LLP
- Agent Constance G. Rhebergen; Taylor P. Evans
- Main IPC: E21B19/00
- IPC: E21B19/00 ; E21B19/16 ; E21B21/10

Abstract:
A tool circulates drilling fluid through and rotates a pipe string while making up or breaking out a stand of pipe. The tool includes a tubular member defining a central bore having an axis, wherein the tubular member comprises an upper tubular member and a lower tubular member, and wherein the upper tubular member and the lower tubular member are configured to alternately rotate independently and in unison. The tool also includes a central bore valve coupled to the upper member, and at least one radial valve coupled to the upper tubular member axially below the central bore valve.
Public/Granted literature
- US20120261138A1 CIRCULATION AND ROTATION TOOL Public/Granted day:2012-10-18
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