低渗透油藏水平井交错井网优化研究

Optimization of staggered horizontal well pattern for low permeability reservoirs

在前人研究基础上,利用保角变换、汇源反映和势叠加原理等渗流理论,对低渗透油藏水平井交错井网的产能公式进行理论研究,得到符合低渗透油藏的公式。井网优化时,给定水平井无因次长度,在其他参数不变的情况下,改变井网形状因子大小,计算水平井无因次产量,从而得到水平井无因次产量随井网形状因子变化的规律曲线,在曲线上找出水平井产量的最大点,由此得到低渗透油藏不同面积、不同油层厚度时,不同无因次长度对应的最优井网形状因子。

This paper studies the productivity formula of staggered horizontal well pattern for low permeability reservoirs based on percolation theories of conformal transformation,sink-source image and superposition principle of potential,and presents a formula fit for low permeability reservoirs.In pattern optimization,given the dimensionless length of horizontal wells,with other parameters unchanged,modify pattern shape factor,calculate dimensionless production of horizontal wells,and thus obtain a curve of dimensionless production vs.pattern shape factor.Find the maximum production point on the curve,thereby we can get the optimal pattern shape factor corresponding to different reservoir areas and thicknesses and different dimensionless lengths of low permeability reservoirs.