低渗透油田产量的递减规律

A Study of the Production Decline Law in Low Permeability Reservoirs

常规产量递减规律不能很好地反映低渗透油藏的生产特征。笔者针对低渗透油藏的基本特性 ,利用低渗透的渗流理论 ,推导出低渗透油藏产量递减方程 ,分析得出结论 :进行低渗透油藏的产量递减 ,必须考虑启动压力的影响。启动压力越大 ,初始产量越小 ,但有启动压力的递减速率比没有启动压力的递减速率要小 ;且累计产量随启动压力的增大而减小。

Conventional production decline law incorrectly reflects the production feature of low permeability reservoirs. In this paper, using the percolation law and the essential characteristic of low permeability reservoirs, the authors set up the production decline equations. Some helpful conclusion is drawn. When the production decline is analyzed, the effect of the threshold pressure must be considered. The higher the threshold pressure, the smaller the initial production. The cumulative production becomes smaller with threshold pressure increasing.