Evaluation of miscible CO/sub 2/ flooding in waterflooded sandstone reservoirs
Conference
·
OSTI ID:7322089
This paper describes a study of miscible carbon-dioxide flooding in waterflooded sandstone reservoirs. Hypothetical reservoirs were constructed which incorporated rock and fluid properties representative of many of the Mid-Continent oil reservoirs that are nearly watered out. A four-component miscible mixing-parameter reservoir simulator was used to investigate the factors that govern tertiary oil recovery from these reservoirs. Four carbon-dioxide tertiary oil recovery processes were analyzed: (1) straight CO/sub 2/ injection, (2) injection of a slug of CO/sub 2/ followed by water, (3) injection of alternate slugs of CO/sub 2/ and H/sub 2/O, and (4) simultaneous injection of CO/sub 2/ and H/sub 2/O. The first two of these processes recovered approximately the same amount of tertiary oil. The simultaneous injection of CO/sub 2/ and H/sub 2/O proved to be the best process. It recovered up to twice as much oil as the other processes and was least sensitive to variations in reservoir parameters. The carbon-dioxide tertiary oil recovery was evaluated over a range of reservoir parameters. These parameters included: K/sub v//K/sub h/ ratios of 0.0, 0.01, and 0.1; well spacings of 10, 20, and 40 acres; and five reservoir descriptions-homogeneous, randomly heterogeneous, and three different stratified descriptions. Tertiary oil recovery was more adversely affected by increasing K/sub v//K/sub h/ ratios than by increasing well spacings. The oil recovery from the homogeneous reservoir description was approximately the same as that from the stratified descriptions. Much more teritary oil was produced from the randomly heterogeneous reservoir description than from the homogeneous description. In all cases the differences in oil recovery due to differences in reservoir description were related to the ease with which the CO/sub 2/ could override and sweep only the top portion of the reservoir.
- OSTI ID:
- 7322089
- Report Number(s):
- CONF-761008-40
- Country of Publication:
- United States
- Language:
- English
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