Invention Grant
- Patent Title: Drilling tool
- Patent Title (中): 钻孔工具
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Application No.: US12574039Application Date: 2009-10-06
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Publication No.: US07958953B2Publication Date: 2011-06-14
- Inventor: Ridha Chafai
- Applicant: Ridha Chafai
- Applicant Address: US TX Houston
- Assignee: National Oilwell Varco, L.P.
- Current Assignee: National Oilwell Varco, L.P.
- Current Assignee Address: US TX Houston
- Agency: Conley Rose, P.C.
- Priority: GB0818493.9 20081009
- Main IPC: E21B10/40
- IPC: E21B10/40 ; E21B10/00
Abstract:
A bi-center drilling tool comprises a main reamer region located eccentrically to an axis of rotation of the tool, and a leading cutting structure located ahead of the main reamer region, in the drilling direction. The leading cutting structure is located so as to apply a side loading to the drilling tool. The side loading is in direction to counter the loading which, in use, is due to the main reamer region being eccentric to the axis of rotation.
Public/Granted literature
- US20100089659A1 Drilling Tool Public/Granted day:2010-04-15
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