柯克亚凝析气藏西七二、西八段储层伤害及敏感性分析

ANALYSIS OF RESERVOIR DAMAGE FACTORS AND SENSITIVITY IN XI72 AND XI8 RESERVOIR OF KEKEYA CONDENSATE GAS FIELD

柯克亚凝析气田西七二、西八段储层呈现出典型的低渗、小孔隙、高含水特征,储层物性差。对西七二、西八段储层伤害因素分析表明,储层具有弱速敏、中强及强水敏、弱酸敏的特征,储层临界矿化度为58 053.9 mg/L。采用X衍射分析和扫描电镜分析对储层伤害机理进行分析得出,引起储层伤害的因素不仅包括储层本身的敏感性,还有注入水固相颗粒杂质引起的孔隙堵塞。在现场作业时,在考虑流体注入速率、黏土矿物防膨的同时,还应对注入水进行精细过滤处理。

The xi72 and xi8 reservoir of kekeya condensate gas field present the feature of low permeability,lowporosity,high water saturation and bad reservoir property. Based on the analysis of damage factors of reservoir,in-dicate that xi72 and xi8 reservoir have the feature of weak rate sensitivity,middle and high water sensitivity,weak acid sensitivity,the critical mineral concentration of reservoir is 58 053.9 mg/L. The X-ray and SEM anal-ysis show that the reservoir damage factors not only include reservoir sensitivities,but also the solid impuritywhich cause reservoir blocking easily. So we should consider the factors about injected water flow rate and claystability,and the water should be filtered further too.