带启动压力梯度的双孔压敏介质压力动态及其应用研究

通过在流动方程中加入启动压力梯度,并考虑地层渗透率随压力的变化发生变化,建立了带启动压力梯度的双孔压敏介质油藏试井解释模型;通过隐式格式对所形成的非线性抛物型方程进行了线性化,采用追赶法进行了求解;通过对参数的敏感性分析表明:启动压力梯度和渗透率变化模数都对压力及压力导数有着很大的影响,导致径向流段不复存在,压力及压力导数曲线在后期上翘;将形成的方法在胜利油田的低渗透潜山油藏进行了应用,解释结果更加符合地质实际,表明了该方法的正确性和实用性。

Study and application of pressure transient of naturally fractured reservoirs with stress-sensitive and start pressure grade

Adding the term of the start pressure grade to the flow equations and considering the variation of permeability via pressure the welltesting interpretation model of naturally fractured reservoirs with stress-sensitive and start pressure grade was established.The nonlinear equations formed above were linearized through the implicit format and were resolved by the LU decomposition.The analysis of parameter sensitivity showed that the start pressure grade and the permeability modulus affected the pressure and pressure derivative strongly.Then the radial flow section no longer existed.The pressure and pressure derivative went up in the later sections.The methods were used in the under-mountain reservoirs with low permeability of the Shengli Oilfield.The results showed that it agrees with the geological facts and the present method is valid and practical.