Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1975-03-31
1976-11-23
Dixon, Harold A.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250253, 250270, G01V 500
Patent
active
039939022
ABSTRACT:
A method is disclosed for determining oil saturation in a petroleum reservoir using logging signals indirectly related to the abundance of carbon nuclei in the reservoir rock. The first step of the invention is to record a log sensitive to the abundance of carbon nuclei after the region surrounding the well bore is caused to have oil saturations representative of the bulk of the reservoir. A purposeful change is then made in the fuel saturations in the region surrounding the well bore by injecting a liquid capable of displacing substantially all of the original fluids. The log is recorded a second time. The displacing fluid is then itself displaced by brine, and a third log is recorded. Oil saturation is then determined from differences between the logs and from known fractional volume carbon contents of the reservoir oil and the first injected liquid. It is not necessary that the log responses be independent of the material in the bore hole, the casing, the casing cement, or the reservoir rock. It is only necessary that changes in oil content cause proportional changes in log response.
REFERENCES:
patent: 2991364 (1961-07-01), Goodman
patent: 3562523 (1971-02-01), Richardson
patent: 3817328 (1974-06-01), Neuman
Chevron Research Company
Dixon Harold A.
Freeland, Jr. R. L.
Messner H. D.
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