MC05602-6 Final 07-1979.pdf
URL: https://edx.netl.doe.gov/storage/f/2014-10-23T15%3A45%3A29.649Z/mc05602-6-final-07-1979.pdf
Based on available reservoir information, CO/sub 2/ displacement seems to be the enhanced oil recovery technique most suitable for most West Virginia oil reservoirs. Seventeen reservoirs have been identified as potential candidates for the CO/sub 2/ displacement process: three Berea, six Big Injun, five Gordon, one Gordon Stray, one Fifth, and one Squaw--Weir sand reservoir. The total volume of oil remaining in these 17 reservoirs is estimated to be more than one billion barrels. The fields are all within a relatively small geographic area and constitute a significant target for enhanced oil recovery technology. There are, however, many difficulties in working with expensive fluids in old fields containing many abandoned wells. Injectivity of liquid CO/sub 2/ in West Virginia oil reservoirs has been demonstrated to be higher than that for water or natural gas. In connection with raising pressures prior to CO/sub 2/ injection, waterflooding has been shown to be effective in two reservoirs previously considered impossible to flood. In the single CO/sub 2/ displacement process completed in West Virginia, the Granny's Creek project, efficiency of recovery was not high: less than one barrel of additional oil per 20 MSCF of CO/sub 2/ injected. The injected liquid was found far outside the project area, however, indicating a need for effective confinement. The CO/sub 2/ process has been demonstrated as effective in displacing oil from a previously waterflooded portion of the reservoir. The three ongoing or projected CO/sub 2/ projects in the state have many common features, which should simplify the complete analysis when they are completed.
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