不渗透岩性边界对苏里格气田开发效果的影响

Influence of impermeable lithologic boundary on development effect of Sulig gas reservoir

为了探明不渗透岩性边界是否为苏里格气田开发早期气井产量下降快且稳产期短的原因,应用数值模拟方法研究直井存在不渗透岩性边界时的开发效果;利用非结构网格加密技术建立水平井压裂模型,研究存在不渗透岩性边界时水平气井的开发效果。结果表明,不论直井还是水平井,模拟的开发效果均与实际情况相符,证明储层存在不渗透岩性边界是开发早期气井产量迅速下降、稳产期短的原因;间歇开井的工作制度能有效减缓气井产量递减速度。

To verify whether the impermeable lithological boundary is the cause resulting in the quick production decline and the short stable production period of gas wells in the early development of Sulige gas field,the development effect of the vertical well with impermeable lithologic boundary is studied through numerical simulation method. The fracturing horizontal well model is established by means of PEBI unstructured grid encryption technology,and the development effect of the fracturing horizontal well with impermeable lithologic boundary is studied. The results show that regardless of vertical well or horizontal well,the simulation development results are in line with their actual situation,which verifies the existence of impermeable lithologic boundary is indeed the cause resulting in the quick production decline and the short stable production period of gas wells in the early development of Sulige gas field. Therefore,the intermittent working system of the gas wells in Sulige gas field can effectively slow down the production decline rate of the gas wells.