气藏水平井产能及水平段压力损失综合研究

为了高效合理的利用水平井开发火山岩气藏,在前人研究的基础上,分析了水平井水平段压力损失对水平井稳态产能的影响。由于水平井水平段井筒内部压力分布不均,根据质量守恒原理以及单元体受力分析,推导出了考虑摩擦压力损失的火山岩气藏水平井产能计算方法并进行了数值求解。定义了相对压力损失系数(PE)来表述摩擦压力损失的程度,利用以上数值求解方法分别对火山岩气藏水平井稳定产能和水平段压力损失的影响因素进行了分析。

Comprehensive Research on the Productivity and Pressure Loss of Horizontal Well in Gas Reservoir

To explore the volcanic gas reservoir rationally and efficiently by using horizontal well technology,a simple and analytical method is proposed to demonstrate the influence of pressure loss along the horizontal well on productivity of the horizontal gas wells. The inhomogenous distribution of pressure in the horizontal bore hole of horizontal gas well occurs. Thus,we deduce the computational method of the horizontal gas well productivity for the volcanic gas reservoir and do the numerical resolution,based on mass conservation law and unit force. A variable PE is defined to describe the relative pressure loss. We use the numerical resolution to determine the productivity of horizontal gas well in the volcanic gas reservoir and the pressure loss of the horizontal gas wells.