应力敏感对致密砂岩气藏气水两相渗流特征影响研究

随致密气藏开发进行,地层压力降低产生应力敏感从而影响气水两相渗流。通过非稳态气驱水实验模拟致密气藏地层条件下气水两相渗流过程,研究了苏里格气田某区块盒8致密储层应力敏感对气水两相渗流的影响。结果表明:围压增大,气水渗流能力降低、共渗区减小、束缚水饱和度增大但总出水量变化不大,由于气相和液相应力敏感存在差异,气相相对渗透率增大、水相相对渗透率减小。

Effect of stress sensitivity on characteristics of gas water two-phase flow in tight sandstone gas reservoir

With the development of tight gas reservoir, the formation pressure is decreased and the stress sensitivity is produced. Through non steady gas drive experiments of water tight gas reservoir with high temperature and high pressure formation condition of gas water two-phase flow process simulation and study the influence of Sulige gas field in Western box 8 tight reservoir stress sensitivity on gas water two-phase flow. The results show that the increase of confining pressure, reduce the gas water percolation ability, permeability, reduced and irreducible water saturation increased but the total capacity of little change, due to the gas phase and liquid corresponding force sensitive differences, resulting in gas relative permeability increases and water relative permeability decreases.