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Patent Searching and Data


Title:
BOTTOMHOLE ASSEMBLY
Document Type and Number:
WIPO Patent Application WO/2004/046505
Kind Code:
A2
Abstract:
A method of drilling a borehole into a subsurface earth formation, using a tubular drill string which includes at its lower end a bottom hole assembly comprising a drill bit, a drill steering system, and a surveying system, wherein the drill string includes a passageway for an auxiliary tool from a first position interior of the drill string above the bottom hole assembly to a second position wherein at least part of the auxiliary tool is exterior of the drill string below the bottom hole assembly, which passageway can be selectively closed, and which method comprises drilling so as to progress the drill string into the earth formation, until a tool operating condition is met; opening the passageway; passing an auxiliary tool from the first position through the passageway to the second position, and operating the auxiliary tool at the second position.

Inventors:
Murphy, Eugene Andrew (12019 Laguna Terrace, Houston, 77041, US)
Runia, Douwe Johannes (Volmerlaan 8, 2288 GD Rijswijk, NL)
Application Number:
PCT/EP2003/050823
Publication Date:
June 03, 2004
Filing Date:
November 13, 2003
Export Citation:
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Assignee:
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. (Carel van Bylandtlaan 30, 2596 HR The Hague, NL)
SHELL CANADA LTD (400-4th Avenue S.W, Calgary, Alberta T2P 2H5, CA)
International Classes:
E21B4/02; E21B10/18; E21B10/62; E21B47/00; (IPC1-7): E21B47/00; E21B10/18; E21B10/62
Foreign References:
US6269891B12001-08-07
US5244050A1993-09-14
US6233524B12001-05-15
US5560437A1996-10-01
US4391547A1983-07-05
US5078650A1992-01-07
GB232521A1925-04-23
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