Récupération assistée des hydrocarbures par injection de CO2. Aspects techniques et économiques

L. Denoyelle, SPE, Inst. Fran<;:ais du Petrole C. Bardon, SPE, Inst. Fran<;:ais du Petrole E. Couve de Murville, SPE, Petrorep Summary. The Coulommes-Vaucourtois field operated by Petrorep and located in the Paris basin is near abandonment. During the 25-year production span, one-fourth of the original oil in place (OOlP) has been produced by a strong bottomwater drive. Reservoir engineering studies and laboratory measurements have shown that the reservoir characteristics were favorable for CO 2 injection.In 1983, an injection well was drilled between four existing production wells. During the spring and summer of 1984, 49 x 10 6 scf [1.4 x 10 6 std m 3 ] of CO 2 followed by 54 x 10 6 scf [1.5 x 10 6 std m 3 ] of N2 were injected. After 21/2 months of CO 2 injection, gas broke through into a well located far outside the pattern area. Shortly afterward, a producing well of the pattern showed a four-fold oil production increase as gas broke through. The three other wells exhibited smoother responses, with production of minute quantities of gas. Significant WOR decreases and oil production increases were observed. Gas analyses showed that the areal extent of the gas "bubble" was 15 to 20 times larger than the pattern area and that CO 2 and N2 did not spread in the same directions.This paper tries to match the test results with the geologic description, which shows the presence of fissures, and the production history of the reservoir, which exhibits a single-porosity behavior. It also stresses the difference between the incremental oil recovery resulting from the formation of an oil bank and that resulting from the gas-lift effect.

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Interpretation of a CO2/N2 Injection Field Test in a Moderately Fractured Carbonate Reservoir

Denoyelle

Bardon

Murville³

1988

SPE Reservoir Engineering

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Récupération assistée des hydrocarbures par injection de CO2. Aspects techniques et économiques

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Interpretation of a CO2/N2 Injection Field Test in a Moderately Fractured Carbonate Reservoir

Interpretation of a CO2/N2 Injection Field Test in a Moderately Fractured Carbonate Reservoir

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