The use of carbon dioxide (CO/sub 2/) in a tertiary oil recovery pilot in the Granny's Creek field, West Virginia, was started in 1976. At first the CO/sub 2/ was injected into the Pocono Big Injun sand at four wells at the corners of an approximately square area of 6.7 acres. The CO/sub 2/ was injected as a liquid, and the pilot portion of the reservoir was maintained at or above miscible pressure. Production was taken from a well inside the square pilot area and from eight wells outside the area. The test began with injection of water to increase reservoir pressure to more than the miscibility pressure. Injection started with CO/sub 2/ alone, then alternate slugs of CO/sub 2/ and water, then CO/sub 2/, alone, and finally water alone was injected. The additional oil recovery was 8,681 bbl for an injection total of 19.76 million lb of CO/sub 2/ for a ratio of 19,626 cu ft per bbl. A second or minipilot in which the injection was in the lower or C zone of the Big Injun sand resulted in 2,007.9 bbl of additional oil through September 1980 from the injection of 4.24 million lb of CO/sub 2/ for a ratio of 18,192 cu ft per bbl. The CO/sub 2/ spread quickly across the southern 350 acres of the field and confinement was not attained. The sales price of the oil after royalty and taxes is probably about equal to the most optimistic cost of the CO/sub 2/ per barrel of additional oil at the present time and far less than a more reasonable cost for the CO/sub 2/. Production of additional oil in each case decreased sharply after injection of CO/sub 2/ was stopped so there appeared to be no benefits over an extended period of time from the injection of CO/sub 2/.