Title:
METHOD AND APPARATUS FOR DETECTING HYDROCARBONS WITH NMR LOGS IN WELLS DRILLED WITH OIL-BASED MUDS
Document Type and Number:
WIPO Patent Application WO2005067569
Kind Code:
A3
Abstract:
A method and system for estimating native hydrocarbons from oil-based drilling muds with the aid of NMR data. Adaptive echo stacking may be used to balance between precision and sensitivity to changes in the fluid composition. Apparent T2 decay time and effective diffusion constants derived from the NMR data may be transformed into an indication of native hydrocarbon type, using known diffusion constants, fuzzy logic, and neural networks.
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Inventors:
GALFORD JAMES E (US)
BONNIE RONALD J M (US)
BONNIE RONALD J M (US)
Application Number:
PCT/US2005/000162
Publication Date:
December 22, 2005
Filing Date:
January 04, 2005
Export Citation:
Assignee:
HALLIBURTON ENERGY SERV INC (US)
GALFORD JAMES E (US)
BONNIE RONALD J M (US)
GALFORD JAMES E (US)
BONNIE RONALD J M (US)
International Classes:
G01N33/24; G01N33/28; G01R33/44; G01V3/00; G01V3/32; (IPC1-7): G01V3/00
Foreign References:
US5696448A | 1997-12-09 | |||
US5536938A | 1996-07-16 |
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