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苏里格气田致密低渗储集层具有很强的压敏性。文章通过岩心应力敏感实验研究了渗透率随有效压力的变化规律。渗透率随有效压力的增大而降低,不可逆损害率为0.55%～24%,平均为8.1%。利用平面径向流理论推导出了考虑应力敏感的气井压力公式,利用该公式可定量分析应力敏感对气井废弃压力的影响,再结合简易的采收率计算方法研究了应力敏感对采收率的影响。
The tight low permeability reservoirs in the Sulige gas field are highly pressure-sensitive. In this paper, the variation of permeability with effective pressure is studied through core stress sensitivity experiment. The permeability decreases with the increase of effective pressure, and the irreversible damage rate is 0.55% ~ 24% with an average of 8.1%. Based on the theory of plane radial flow, the gas well pressure formula considering the stress sensitivity is deduced. By using this formula, the influence of stress sensitivity on the gas well pressure can be quantitatively analyzed. Combined with the simple calculation of the oil recovery rate, influences.