Low Permeability Reservoir Two-phase Flow Numerical Simulation Study

The population, resources and the environment is an important problem for all the country in the world all through the 21st century. Oil has become one of the scarcest resources, with development of word industry, and oil constantly producing. Modern petroleum industry depends on operation and recovery of intermediate-high permeability reservoir in our country. But reserves of low-permeability reservoir have rapidly increased since 1990. And reserves of low-permeability reservoir has accounted for a growing proportion of reserves having been ascertained. Low-permeability reservoir has become the important resource for stable development of our oil industry.This article deduct the differential equation of two-phase flow of the low-permeability reservoir, based on the research theory and experiment of two phase flow of oil and-water and deduce the mathematics model and the solution of two phase of oil-water of low-permeability reservoir. IMPES method is usually used previously, which deal with the pressured implicitly and saturation explicitly, its convergence speed is slower and it doesn't used in complicated numerical simulated calculation. This article use implicit method, which is fast and high precision to deal with model of two-phase flow of oil-water of low-permeability reservoir.Based on the above-mentioned theory, read a lot of documents, this paper study two-phase flow of oil-water in depth from the respect of model building and method innovating. And this text improves fully-implicit simultaneous solution, which incorporate other methods of numerical simulation. This article adopt to alternating direction implicit method in the progress of practical calculation in order to ensure stability of calculation and decrease the calculation amount.