Invention Grant
- Patent Title: Flexible directional drilling apparatus and method
- Patent Title (中): 灵活的定向钻井设备及方法
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Application No.: US11334707Application Date: 2006-01-18
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Publication No.: US07861802B2Publication Date: 2011-01-04
- Inventor: Lance D. Underwood , Charles H. Dewey
- Applicant: Lance D. Underwood , Charles H. Dewey
- Applicant Address: US TX Houston
- Assignee: Smith International, Inc.
- Current Assignee: Smith International, Inc.
- Current Assignee Address: US TX Houston
- Agency: Osha Liang LLP
- Main IPC: E21B7/04
- IPC: E21B7/04 ; E21B10/26

Abstract:
A bottom hole assembly to directionally drill a subterranean formation includes a drill bit, a stabilizer assembly located proximate to and behind the drill bit, a drilling assembly comprising a drive mechanism and a directional mechanism, and a flex member. Optionally, the flex member may be located between the drilling assembly and the stabilizer assembly or an integral to a housing of the drilling assembly. A method to drill a formation includes positioning a stabilizer assembly behind a drill bit and positioning a flex member between an output shaft of a drilling assembly and the stabilizer assembly. The method preferably includes rotating the drill bit, stabilizer assembly, and flex member with a drilling assembly and directing the trajectory of the drill bit and stabilizer assembly with a directional mechanism of the drilling assembly.
Public/Granted literature
- US20070163810A1 Flexible directional drilling apparatus and method Public/Granted day:2007-07-19
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