致密砂岩储层中气体渗流规律实验研究

发布时间：2018-07-28 15:41

【摘要】：为了揭示苏里格气田致密砂岩中气体渗流规律,采用物理模拟方法测试了不同含水条件下不同气驱压力时气体流量,在考虑气体偏差因子、黏度和压力关系基础上,研究了压力、气体偏差因子、黏度与流量的关系。结果表明:致密气藏中气体需要突破一定门槛压力,才能在砂岩孔隙内产生有效流动,岩心渗透率越低、含水饱和度越高,门槛压力越大,当气驱压力突破门槛压力后,气体在砂岩中渗流时表现出黏性流特征;随气驱压力增加,压力/气体偏差因子/黏度与流量的关系会由非线性关系转变为线性关系;岩心渗透率≥1×10~(-3)μm~2时,气体以线性渗流为主;岩心渗透率为(0.1～1)×10~(-3)μm~2时,当气驱压差1 MPa,气体以线性渗流为主;岩心渗透率≤0.1×10~(-3)μm~2时,当含水饱和度为20%,出现气相渗流门槛,当气驱压差3 MPa,气体才能达到线性渗流;渗透率0.345×10~(-3)μm~2时,随渗透率增加,配产界限值先快速增加,之后增速变缓;在渗透率相同条件下,储层含气饱和度愈高,则配产界限值愈高。
[Abstract]:In order to reveal the law of gas seepage in tight sandstone of Sulige gas field, the gas flow rate under different water cut conditions under different gas drive pressure was measured by physical simulation method. The gas deviation factor, viscosity and pressure relation were considered. The relationship between pressure, gas deviation factor, viscosity and flow rate is studied. The results show that the gas in the tight gas reservoir needs to break through a certain threshold pressure in order to generate effective flow in sandstone pores. The lower the core permeability, the higher the water saturation, and the greater the threshold pressure, when the gas drive pressure breaks through the threshold pressure. The relationship between pressure / gas deviation factor / viscosity and flow rate will change from nonlinear to linear, and the core permeability 鈮，

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