Abstract
ABSTRACT This paper presents the laboratory study and field application of foam injection into the Kaybob South Triassic A Pool, in Alberta, Canada. This carbonate reservoir was under primary production from 1962 and waterflood from 1967. A hydrocarbon miscible flood scheme was implemented in part of Unit No. 1 of the pool in mid 1984. First solvent breakthrough was experienced in late 1984. The possibility of using foam injection to control gas gravity override and improve sweep efficiency in the hydrocarbon miscible flood has been evaluated. Foam injection experiments were conducted in the laboratory during early 1987 on cores extracted from the Pool. Several commercially available foaming agents were compared under various injection rates, liquid/gas ratios and concentrations. Mobility of gas was reduced by a factor of about 30 by foam injection. Various ways of conducting the foam injection tests in the field were examined. The procedure of experiment and data acquisition/analysis is discussed. Foam injection field tests were started during September, 1987 in the hydrocarbon miscible flood area. Success in foam injection and propagation has been observed. Results from the field tests are presented.
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