Determination of residual oil saturation using thermal neutron d

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods

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G01V 510

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045298785

ABSTRACT:
A method for determining residual oil saturation of a formation using an improved log-inject-log technique that does not require knowledge of the porosity of the formation or any other property of the formation or its indigenous fluids. The method consists of injecting a first fluid to remove the formation waters and logging the formation to determine the thermal neutron cross section and then injecting a second fluid having a different cross section to displace the first fluid, then re-logging the formation. Next, the residual oil and gas are swept from the formation by a chemical flood followed by the injection of a third fluid to displace the chemical flood. The formation is logged and a fourth fluid injected to displace the third fluid and the formation is logged again. Normally, the first and third and second and fourth injection fluids will be the same.

REFERENCES:
patent: 3562523 (1971-02-01), Richardson et al.
patent: 3631245 (1971-12-01), Jorden, Jr. et al.
patent: 3748474 (1973-07-01), Murphy
patent: 4191883 (1980-03-01), Albright et al.
patent: 4349737 (1982-09-01), Smith et al.

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