Prospect of In – situ Combustion Applying as IOR Process on Russkoe Field

摘要

The main oil deposits of Russkoye Field relate to the anisotropic reservoir with both sizeable gas cap and bottom water. The additional issue for petroleum engineering is heavy oil (0.91-0.94 g/cm3) with unique oil properties, high viscosity (140-360 mPa.s), and low GOR (14-25 m3/m3). The development of such type of field using conventional methods is inefficient. Thus, some specific enhanced oil recovery methods are required. In this paper the In-Situ Combustion Analysis and its efficiency assessment were conducted in case of Russkoye field. Firstly, the testing history of ISC during 1983-1985 period in five spot pattern and also laboratory researches about chemical reaction kinetics, oil ignition temperature, combustion gases analysis was performed. Despite the method was tasted relatively long ago in the area of Russkoye Field, the obtained results are still relevant, but it is required more careful analysis. Based on these data the PVT and sector simulation model was built. Then, the first attempt in ISC modeling was performed for Russkoye Field. The created simulation model was history matched and demonstrated rather similar behavior with field observations. After that, the prediction of ISC and THAI implementation is showed. The modeled prediction variants demonstrate rather interesting results. Simulation modeling of THAI indicates that recovery factor may be increased in comparison with water injection and depletion.