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Comparison of Numerical Simulation Results of Water Flooding with Gas Injection in Low permeability Reservoirs

Li Liuren et al (Xian Petroleum Institute, Xian 710065·China)  
Taking the low permeability reservoir of Pingqiao Area in Ansai Oil Field as an example, the results of water flooding and gas injection are numerically simulated with 3D 3P Full compositional simulator, and the simulation results are compared. It is shown that, (1) the results of both water flooding and gas injection are better than that of natural development. (2) the processes of water flooding and gas injection can be divided into three stages according to the simulation results, in the first and last stages, the result of water flooding is better than that of gas injection, but in the middle stage, gas injection is better than water flooding. The start times and the durations of the three stages depend on the composition of injected gas. (3) the recovery factor of water flooding can reach to 26.24%, the recovery factor of gas injection is in the range of 14.14% ̄24.28%, and the richer the injected gas, the higher the recovery factor. (4) the key to increasing recovery factor is to delay the breakthrough of injected gas at the bottom of producing well.
【CateGory Index】: TE357.6
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