This reference is for an extended abstract only. A full paper was notsubmitted for this conference.

ABSTRACT

In this study the Gas-Oil IFT is used to determine the MMP of a crude oiland a volatile oil by gas injection. The method involves injection of a drop offluid, say oil, into gas phase to determine the IFT between the two phases. TheVLE IFT equipment includes a fixed-volume cell with glass windows on oppositesides through which the image of the drop hanging from the capillary tip isauto-captured and formulated by computer. A computational procedure built-inthe Laplace capillary equation is applied to match the image shape of anaxisymmetric fluid interface. First, IFT was determined for a simple mixture tovalidate the performance of the equipment, and the values are within the rangeof published data. Thus the measurements are repeated for the oil-gas systemsat several pressures down to as low IFT as possible. At last, the MMP isdetermined, and the result show a good agreement with the other testsperformed. The evaluation further indicates that this new method is reliableand may have a prospect of wide applications due to its visualization andrapidity and cost-effectiveness.

INTRODUCTION

Miscible/near-miscible flooding by gas injection has nowadays become one ofthe most important conventional enhanced oil recovery (EOR) processes (1) towhich the minimum miscibility pressure (MMP) is closely related. As theconventional approaches to determine MMP are very time-consuming and costexpensive, there is a need to develop new methods to overcome thedisadvantages.

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