应力敏感油藏合理工作制度的确定

Reasonable development system on the stress-sensibility reservoirs

以肯基亚克油田石炭系油藏为例,对异常高压、特低渗透油藏的储层压力敏感性进行了分析.运用压力敏感油藏产能方程并结合经济因素提出了不同渗透率伤害系数地区合理的工作制度.结果表明:异常高压油藏具有应力敏感性,地层压力下降后孔隙度和渗透率均有不同程度地下降;应力敏感油藏的产能曲线特征与常规油藏显著不同,即在同样的生产压差下,应力敏感油藏单井产能比常规油藏产能明显偏低;当生产压差高于一定数值后,增加应力敏感油藏生产压差后油井产能反而减小;渗透率伤害系数越大,曲线弯曲越早,弯曲度越大.

This paper studied the stress sensibility,which was based on overpressure and super low permeability Carboniferous reservoirs in Kenneyark Oilfield.The different permeability damaged modulus stress-sensitivity reasonable working system was presented which combined the deliverability equation with the economic factor.As a result,the overpressure and super low permeability reservoirs had stress sensibility;the porosity and permeability declined to some extent with the reservoir pressure dropping down.The IPR curve character of stress sensibility reservoir was different from the routine one,viz.at the same pressure,the single well potential of the former was remarkably lower than the latter.However,the different pressure was higher the some value,the well potential was less.The larger permeability damage modulus and the earlier the IPR curving occurred,and greater the camber was.