青龙台油田疏松砂岩储层敏感性分析

Sensitivity Analysis of Unconsolidated Sandstone Reservoir in Qinglongtai Oilfield

针对青龙台油田的地质特征,利用沙三段储层取心岩样,进行储层敏感性室内实验,测试分析了储层的速敏性、水敏性、盐敏性、酸敏性、碱敏性。结果表明,沙三段油层具有弱-中等偏弱速敏,中等偏强-强水敏,中等偏弱酸敏,中等偏强-强碱敏。鉴于该区储层疏松易出砂及其敏感性特点,为保护储层,建议严格控制注采速度在10 m/d以下;入井流体的矿化度不应低于5 000 mg/L,pH不应高于8. 5。

Based on the reservoir characteristics in Qinglongtai Oil Field,the reservoir sensitivity evaluations have been done by using core sample of the third member of Shahejie Formation to test and analyze the velocity sensitivity,water sensitivity,salt sensitivity,acid sensitivity and alkali sensitivity of the reservoir.The results show that the third member of Shahejie Formation has weak-medium weak velocity sensitivity,medium-strong-strong water sensitivity,medium-weak acid sensitivity,and medium-strong alkali sensitivity.Because the reservoir is loose and easy to produce sand and its sensitivity in this area,in order to protect the reservoir,the injection speed should be strictly controlled under 10 m d for unconsolidated sandstone,the injected fluid salinity should not less than 5 000 mg L and pH value ought to be less than 8.5.