Abstract
ABSTRACT Gas mobility control is highly required to obtain a sufficiently-expanded and uniformly-developed steam chamber, which is conducive to steam-assisted gravity drainage (SAGD) production. Adding chemical additives with in-situ generation of foam (CAFA-SAGD) is an approach to improve sweep efficiency, displace residual oil and reduce heat loss, enhancing SAGD performance in terms of both oil production and steam oil ratio (SOR). With the input of the obtained chemicals and foam parameters and the consideration of the principle mechanisms (steam foam mobility control and IFT reduction), it depicts the dynamic distribution of components and compares the performance of CAFA-SAGD and SAGD with numerical simulation. Foam generation and foam collapse are also incorporated. Simulation study demonstrates that steam mobility control is conducive to generate a larger oil displacement area in the lower part of the model. Also, residual oil is more depleted owing to higher injection pressure and interfacial tension reduction. The optimization from this study ensures that the oil recovery factor is improved by 5.34%.
Published Version
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