扶余油层储层敏感性评价

Evaluation of Reservoir Sensitivity of Fuyu Oilfield

扶余油层是一个以特低渗透储量和伊利石、绿泥石为主、以蒙／伊、蒙／绿混层为辅的细粒岩屑长石细砂岩储层。储层潜在伤害程度大．开发过程中油层易受到伤害。通过模拟地层水对岩心的驱替实验，对扶余油层3口井的速敏性、盐敏性、碱敏性、酸敏性和应力敏感性等进行了研究，为后续工作液提供合理依据、结果表明，扶余油层A井存在速敏．临界流速为0．007388m／d．盐敏性中等偏强，临界矿化度确定为4×10^4mg／L；B井酸化岩心改善，且存在较强的应力敏感性：C井碱敏临界pH值为9，弱碱敏。

There are large potential extents of damage to Fuyu oilfield reservoirs. Through displacement experiment of simulated water on core, sensitivity to flow rate, sensitivity to salt, sensitivity to alkali, sensitivity to ackl, and sensitivity to stress of three wells in the Fuyu oil layer has been studied, so as to provide reasonable reference for follow-up working liquid. The results indicate that the well A in the Fuyu oil layer has sensitivity to flow rate, with critical flow rate of 0.007388m/d. the sensitivity to salt is strong middle, and the critical salinity is determined as 4×10^4mg/L. Aeidizing cores of well B have been improved, with strong sensibility to stress. The critical pH value of sensitivity to alkali in well C is 9, being weak sensitivity to alkali.