Title:
CORE DRILL ASSEMBLY WITH ADJUSTABLE TOTAL FLOW AREA AND RESTRICTED FLOW BETWEEN OUTER AND INNER BARREL ASSEMBLIES
Document Type and Number:
WIPO Patent Application WO2007136568
Kind Code:
B1
Abstract:
A core drill assembly with replaceable cutting fluid nozzles permitting effective total flow area adjustment (TFA), substantial optimization of hydraulic force at the cutting face to improve rate of penetration (ROP) and core quality. At least one seal assembly to restrict drilling fluid flow while permitting mutual rotation between the core head ID and the lower shoe is disposed in an annulus defined therebetween.
Inventors:
WILSON BOB T (AE)
REGENER THORSTEN (DE)
REGENER THORSTEN (DE)
Application Number:
PCT/US2007/011355
Publication Date:
April 03, 2008
Filing Date:
May 10, 2007
Export Citation:
Assignee:
BAKER HUGHES INC (US)
International Classes:
E21B10/02; E21B10/60; E21B25/00
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