﻿ 应力敏感性油藏油水两相渗流数值模拟

应力敏感性油藏油水两相渗流数值模拟Numerical Simulation of Oil and Water Tow-Phase See-page in Stress Sensitivity Reservoirs

The mathematical model of oil and water two-phase seepage was derived and solved by numerical limited difference method in the paper. During the simulation, permeability values of every time step were calculated by relation curves between dimensionless permeability and effective stress obtained by experiment. Then the pressure distribution of next time step was calculated by the new permeability distribution. The situation of non-stress sensitivity and three different kinds of sensitive degree are studied respectively through numerical stimulation method. Figures of the dimensionless permeability space distribution, the daily oil production and the average reservoir pressure were drawn. Results show the stronger the stress sensitivity is, the variation range of the average reservoir pressure is small and the daily oil production is lower during the water free oil production period. While the weaker the stress sensitivity is, the variation range of the average reservoir pressure is large and the daily oil production is higher during the water free oil production period. Permeability distribution changes sharply around production and injection wells, while smoothly far from wells.

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