低渗透油藏压降漏斗影响因素研究

摘要

The pressure drop funnel plays an important role for well production. It can expand the drawdown pressure in the reservoir so that more reserves is produced. On the other hand the pressure drop funnel descends very slowly near the external boundary but steepens sharply near the borehole bottom, which indicates most of the energy is consumed near the wellbore. Compared with the conventional reservoirs, the pressure drop surface of the low permeability reservoir is steeper, and the energy is more difficult to complemented. In such conditions,a new pressure distribution formula of ow permeability reservoir is proposed and the influence factors are systematically analyzed, based on the reservoir examples.%压降漏斗对油井产量具有重要影响.一方面压降漏斗扩大了储层的生产压差,使得更多的储层储量被动用；另一方面压降漏斗在供给边缘附近下降很缓慢,而在井底附近变陡,说明流体从供给边缘到井底其能量大部分消耗在近井地带.而与常规油藏相比,低渗透油藏的压降面更陡,能量补充更为困难.在此背景下,提出了描述低渗透油藏压力分布的公式.通过油藏实例,系统分析了影响低渗透油藏压降漏斗的因素.