Conoco Inc.

James C Albright

Preston L Gant

J Scott Moore

Kenneth R Pittaway

A test is provided for evaluating and/or designing an enhanced oil recovery process including CO.sub.2 injection. A modified log-inject-log technique is utilized to determine residual CO.sub.2 saturation and incremental hydrocarbon displacement.

Single well test for evaluating CO.sub.2 injection

An improvement in the method of determining oil saturation in a subterranean formation, penetrated by a well-bore, is disclosed. In the method of determining oil concentration by measuring thermal neutron decay with a low salinity aqueous liquid in said well-bore and said formation, and measuring thermal neutron decay with a high salinity aqueous liquid in said well-bore and said formation, the improvement comprises adding to said low salinity liquid in the well-bore, only, a material which adjusts the thermal neutron capture cross section of the well-bore so that it is approximately the same as the thermal neutron capture cross section of the well-bore when it contains the high salinity liquid.

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Ponca City, OK, United States of America

James C Albright