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克拉-2气藏是深层异常高压气藏(气层压力74.5MPa,压力系数2.022),由于异常高压气藏岩石物性特点及其变化特征必将对气藏生产动态产生一定影响,本文进行相关的研究和探索。实测了克拉-2异常高压气藏岩样不同覆压下的渗透率,根据实测结果拟合出渗透率的应力敏感性幂函数表达式,总结了岩石渗透率随气藏压力或有效覆压的变化规律。考虑渗透率变化对气藏产能的影响,推导出新的产能方程。研究表明:克拉-2气藏岩样应力敏感性高于大庆油田岩样,具有异常高压气藏岩石欠压实的特点。岩样的应力敏感性使产能降低,克拉-2气藏条件下考虑应力敏感时的AOF是渗透率为常数时AOF的70%左右。该研究对深入了解异常高压气藏的产能及预测异常高压气藏的开发动态和采收率有一定意义。
The Kela-2 gas reservoir is a deep anomalous high-pressure gas reservoir (gas pressure of 74.5MPa and pressure coefficient of 2.022). Because of the petrophysical characteristics and its changing characteristics of the gas reservoir in an abnormally high pressure area, it is bound to have an impact on gas production dynamics. In this paper, Research and exploration. The permeability of rock samples under different overburden pressure was measured. According to the measured results, the stress sensitivity power function expression of permeability was fitted. The relationship between rock permeability and reservoir pressure or effective overburden The law of change. Considering the influence of permeability change on gas production capacity, a new productivity equation is deduced. The results show that the stress sensitivity of the Kla -2 gas reservoir is higher than that of the Daqing oil field, and the rock of the abnormal gas reservoir is less compacted. The stress sensitivity of the rock samples decreases the productivity. The AOF under stress-sensitive conditions in the Kela-2 gas reservoir is about 70% of AOF at constant permeability. This study is of great significance to understand the production capacity of abnormally high pressure gas reservoirs and predict the development and recovery of abnormally high pressure gas reservoirs.