考虑介质变形的低渗透气藏数值模拟研究

在室内实验得到的孔隙度变化率和渗透率变化率随有效压力变化规律的基础上，建立了考虑介质变形的低渗透气藏数值模拟模型，并采用IMPES方法进行了求解。研究结果表明，无论是否考虑介质变形，随着稳产期产能的增加，稳产期缩短，稳产期采出程度降低；但考虑介质变形与否对模拟结果有较大影响，当考虑介质变形时，井底流压下降较快，稳产期相对更短，稳产结束时的采出程度也更低。因此，对于变形介质气藏，气井的配产不能太大，否则将严重影响稳产期采出程度。

A study on numerical simulation of deformable low permeability gas reservoir

Based on the lab study of variation of porosity changing rate and permeability changing rate with effective pressure,a numerical simulation model of deformable low permeability gas reservoir is established and is solved using IMPES method.The simulation result shows that both the duration of plateau production period and the gas recovery factor during this period decrease as the productivity in the period increases;but the deformation of the porous medium has great influence on the simulation results.The flowing bottomhole pressure decreases more quickly,the period of plateau production is shortened and the gas recovery factor obtained when the plateau production period ends is lower while media deformation is considered.The production proration of the gas wells should not be too large in deformable low permeability reservoir,otherwise the gas recovery factor obtained during the plateau production period would decrease greatly.