摘要
深入认识低渗透储层的渗流特征,对如何经济有效开发低渗透油田具有重要指导意义。应用1米长露头岩心渗流模拟系统,研究了低渗透岩心单相渗流过程、恒压水驱油过程中压力动态传播特征,克服了短岩心模拟过程中产生的端面效应,较真实的反映了低渗透储层的渗流特征。低渗透长岩心单相水渗流实验表明,低渗透储层由于应力敏感效应导致渗透率沿渗流方向降低。储层渗透率并非常数,而是孔隙流体压力的函数。低渗透储层内部压力分布呈非线性特征,生产压差越大,岩心内部压力分布的非线性程度增强。压力损失因应力敏感效应主要消耗在生产井近井地带,越靠近生产井,压力分布的非线性程度越明显。恒压水驱油过程中,渗流阻力主要损失在油水两相区。在油水前缘到达各测压点之前,其压力逐渐下降,油水前缘通过该点后,其压力逐渐上升。
Learning more about flow characteristics of low permeability reservoir is significant to develop low permeability oil field cost-effectively.One-meter-long outcrop seepage flow simulator was set up to study the dynamic pressure propagation under the condition of single phase seepage flow and water flooding with constant differential pressure.End effect in short core simulator was eliminated and the seepage characteristics of low permeability reservoir were revealed in this paper.It＇s showed that,in the single phase water seepage flow experiment,the permeability parameter of low permeability formation is not a constant value but the function of fluid＇s pressure in the pore,and the pressure distribution within the long core is non-linear along the flow direction.With drainage differential pressure increase,the non-linear tendency of pressure distribution becomes stronger.Due to stress sensitivity,pressure loss is mainly near to the production well.Constant differential pressure water flooding experiment showed that,seepage resistance loss is mainly in oil-water two-phase zone.When water/oil front arriving the pressure taps,their pressure declines gradually.After water/oil front passes those taps,their pressure begins to increase.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2010年第6期758-762,共5页
Chinese Journal of Hydrodynamics
关键词
长岩心
渗流
压力分布
物理模拟
Long core simulator
seepage flow
pressure distribution
physical modeling
