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低渗透气藏具有较强的应力敏感性,随着生产的进行,储层压力下降,有效压力增加,渗透率下降,进而引起气藏产能的降低。在压力敏感性实验过程中,采用改变围压的方法来近似地模拟储层所承受压力的变化,主要研究了压力变化对储集层渗透率的影响。实验结果表明:压敏对渗透率的伤害是不可恢复的,根据渗透率区间建立了有效压力与储集层渗透率之间的函数关系式。采用数值模拟技术应用建立的函数关系对苏里格气田水平井进行研究,模拟考虑和不考虑压敏性,累产量降低了3.47%,分析压敏性在低渗气藏开采过程中的影响程度,制定出合理的生产制度。
Low permeability gas reservoirs have strong stress sensitivity. With the progress of production, reservoir pressure decreases, effective pressure increases and permeability decreases, which in turn leads to the decrease of gas reservoir productivity. In the process of pressure sensitivity experiment, the method of changing confining pressure was used to simulate the change of reservoir pressure. The main study was the influence of pressure change on reservoir permeability. The experimental results show that pressure damage to permeability is not recoverable, and the functional relationship between effective pressure and reservoir permeability is established according to the permeability interval. The numerical simulation technique was used to study the horizontal wells in the Sulige gas field. The simulation results showed that the cumulative yield decreased by 3.47% with or without considering the pressure sensitivity. The influence of pressure sensitivity on the exploitation of low-permeability gas reservoirs was analyzed , To develop a reasonable system of production.