Buckley Leverett theory application in improved recovery by solvent injection in the VHR Field.
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Abstract
This study presents the laboratory results of the solvent injection in samples obtained from reservoir M-2, the VHR oil field of the Ecuadorian Amazon region. The objective was to determine the increase of the recovery factor in cores saturated with oil of 29.2 API degree. This study consisted of three stages: in the first stage, several EOR methods that can potentially be applied to cores, which was obtained from the M-2 sandstone, that ones were analyzed. In the second stage, an oil displacement was made using formation water, this result was used as a reference point. In the third stage, the oil was displaced with solvent and compared with the result of the second stage. For the second and third stages, a simple model based on the Buckley-Leverett theory was developed. This model helped to quantify the increase in the recovery factor. The screening criteria determined that the conditions were appropriate for solvent injection. The reference point gave a recovery factor of 25.7 percent. On the other hand, the displaced oil after using solvent was 43.74 percent. This result means an increase of 18.04% in the recovery factor. The numerical method gave a recovery factor of 49.97 percent, which is 6.23 percent higher than the experimental values. The experiment allowed to conclude that the option of injecting solvent is very practical for use in a pilot project for the M-2 reservoir of the VHR field of the Ecuadorian Amazon region.
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