Low-cost but accurate radioactive logging for determining water

Details Low-cost but accurate radioactive logging for determining water Low-cost but accurate radioactive logging for determining water

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

039939049

ABSTRACT:
A method is disclosed for determining water saturation in a petroleum reservoir using logging signals indirectly related to the abundance of oxygen nuclei in the reservoir rock. The first step of the invention is to record a log sensitive to the abundance of oxygen nuclei, 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 log is recorded a second time. The displacing fluid is then itself displaced by brine, and a third log is recorded. Water saturation is then determined from differences between the logs and from known fractional volume oxygen contents of the reservoir brine and the first injected liquid. 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 content cause proportional changes in log responses.

REFERENCES:
patent: 2991364 (1961-07-01), Goodman
patent: 3562523 (1971-02-01), Richardson
patent: 3748474 (1973-07-01), Murphy
patent: 3757575 (1973-09-01), Murphy et al.
patent: 3812353 (1974-05-01), Gilchrist
patent: 3817328 (1974-06-01), Neuman
patent: 3825752 (1974-06-01), Murphy et al.

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