【摘要】 在油藏降压开采过程中,渗透率和孔隙度等油藏参数随着油藏压力降低而发生动态变化,同时油藏参数的变化又会影响到油藏压力的分布。建立油藏降压过程中孔隙度、渗透率与油藏压力间的函数关系,并结合渗流力学和岩石力学理论,得到油藏降压过程中流固耦合的数学模型,同时利用Visual Basic计算机语言编制了相应计算软件,对胜利油区某区块降压过程进行了数值模拟计算。计算结果表明,在油藏降压过程中,流固耦合作用会减缓油藏降压速度;渗透率越小,流固耦合作用对油藏压力分布影响越明显;排液速度越大,流固耦合作用对井底流压影响越大。因此,在油藏降压开采参数设计时要充分考虑到流固耦合作用的影响。更多还原

【Abstract】 Permeability and porosity of reservoir change dynamically during depressurization production of oil reservoir.And the change of these reservoir parameters influences the distribution of the reservoir pressure.The relationship between permeability & porosity and reservoir pressure were built up respectively according to the research results.Then,the coupled fluid-solid mathematical model of the reservoir pressure distribution was achieved based on the theory of seepage mechanics and rock -mechanics.Corresponding calculated software was programmed by Visual Basic computer language.An actual depressurization production of reservoir in Shengli Oilfield was stimulated as example.Numerical stimulation results indicate that the coupled fluid-solid affects the reservoir decompression rate and the distribution of reservoir pressure greatly,especially in low-permeability reservoir.The bottom hole flowing pressure is impacted,too.The fluid-solid coupling must be considered in designing the depressurization production of reservoirs.更多还原