Low-cost but accurate radioactive logging for determining gas sa

Details Low-cost but accurate radioactive logging for determining gas sa Low-cost but accurate radioactive logging for determining gas sa

1975-03-31

1976-11-23

Dixon, Harold A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250256, 250270, G01V 500

Patent

active

039939030

ABSTRACT:
A method is disclosed for determining gas saturation in a petroleum reservoir using logging signals indirectly related to the abundances of oxygen and carbon nuclei in the reservoir rock. The first step of the invention is to record first and second logs sensitive to the abundance of oxygen and carbon nuclei, respectively, after the region surrounding the well bore is caused to have fluid saturations representative of the bulk of the reservoir. A purposeful change is then made in the fluid saturations in the region surrounding the well bore by injecting a liquid capable of displacing substantially all of the original fluids. The logs are recorded a second time. The displacing fluid is then itself displaced by brine, and a third suite of logs is recorded. The total fluid and oil saturations are then determined from the differences between respective corresponding logs and from known fractional volume oxygen and carbon contents of the reservoir brine and oil and the first injected liquid. Gas saturation is then calculated from differences between total fluid and oil saturation values. It is not necessary that the log responses be independent of the material in the borehole, the casing, the casing cement, or the reservoir rock. It is only necessary that changes in formation fluids content cause proportional changes in log responses.

REFERENCES:
patent: 2991364 (1961-07-01), Goodman
patent: 3562523 (1971-02-01), Richardson
patent: 3817328 (1974-06-01), Neuman

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