Investigation on Fluid-Solid Coupling Effect of Wuzhan Tight Gas Reservoir

摘要

This paper investigated the characteristic of change of porosity and permeability as effective stress changes for tight gas reservoir using experiments on natural cores. The influence of coupling effect on the result of numerical simulation was then studied taking Wuzhan gas field in Daqing, China as an example. The research shows that both pore volume and porosity decrease with the increase of pressure. Besides this, the research also shows that the relationship between effective stress and pore volume and that between effective stress and porosity obey very good exponential power law. The controlled dynamic reserves of single well and whole gas reservoir and forecasting results of the development index derived by numerical simulation method accorded with the real situation very closely, under the condition that pressure sensitivity effect was taken into consideration.