论文部分内容阅读
根据页岩气储层中气体的成藏机制及流动机理,综合考虑了解吸—吸附作用和应力敏感性对页岩气藏产能的影响,建立了考虑解吸、扩散及渗流综合作用的页岩气稳态流动模型,在不同边界条件下对控制方程进行求解,得到页岩气储层的压力分布及产能方程,分析了不同解吸量对地层压力和产量的影响,解吸量越大,地层压力下降越慢,产量和压力平方差呈线性关系。在此基础上建立了考虑应力敏感性的产能方程,分析结果表明随着渗透率变异系数的增大,储层的应力敏感性越强,产量逐渐减小,要合理控制压差,以防对储层造成损害。此模型对页岩气生产和后续研究具有重要指导意义。
According to the mechanism and mechanism of gas accumulation in shale gas reservoirs, the effects of desorption-sorption and stress sensitivity on the productivity of shale gas reservoirs are comprehensively considered, and the shale gas considering the combination of desorption, diffusion and seepage is established The steady-state flow model is used to solve the governing equation under different boundary conditions. The pressure distribution and capacity equation of the shale gas reservoir are obtained. The influence of different desorption volumes on the formation pressure and yield is analyzed. The larger the desorption capacity is, the lower the formation pressure The slower, the output and pressure squared deviations are linear. On this basis, the productivity equation considering the stress sensitivity is established. The results show that as the coefficient of variation of permeability increases, the stress sensitivity of the reservoir becomes stronger and the output decreases gradually. Therefore, the pressure difference should be controlled reasonably Reservoir damage. This model has important guiding significance for shale gas production and subsequent research.