| With the development of global economy, oil demand is still growing fast all around the world. Oil reserves are becoming smaller during the past several decades. Under this situation, heavy oil is getting more and more important in oil reserves. There are many kinds of heavy oil reserves on the earth for which there are different ways to extract. China is rich in heavy oil reserves. Cyclic steam stimulation (CSS) is a suitable way for heavy oil recovery in China. Cyclic steam stimulation is a complicated systematic engineering which worth studying.Commonly there are two forms of simulation of heavy oil recovery:physical simulation and numerical simulation. Numerical simulation is more popular now because its low costs, high efficiency and convenience. In this thesis, we use the T2VOC module of TOUHG2codes which is developed by Lawrence Berkeley Laboratory to simulate cyclic steam stimulation method in heavy oil recovery. T2VOC is a numerical simulator for three-phase, three-component, non-isothermal flow of water, air, and a volatile organic compound in multidimensional heterogeneous porous media. T2VOC is an extension of the TOUGH2general-purpose simulation program. Now T2VOC is often used to study the problems of Non-aqueous Phase Liquids (NAPLs) pollution in the soil and groundwater. But there is no precedent of T2VOC using in heavy oil recovery. Because the lack of real data of the reservoir, we use an ideal example to verify the applicability of T2VOC simulating CSS in heavy oil recovery. Simultaneously, we analyze the influence of geological parameters (reservoir thickness, permeability, initial oil saturation, porosity and oil viscosity) and injection-production parameters (steam injection rate, steam injection strength, soak time and steam dryness) during recovery view to support the production practice of heavy oil recovery. At last we conclude the problems using T2VOC in CSS and propose some methods to solve them. |
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