海上油田注水处理用粘土防膨剂的室内筛选

The lab screening of clay anti-swelling agent for water injection treatment in offshore oil field

针对海上油田储层特点筛选粘土防膨剂,对控制储层水敏伤害和保障整个油田的持续高效开发有非常重要的意义。综合多种防膨剂评价方法的优点,采用静态与动态相结合的实验评价方法,筛选了适用于海上某油田注水开发的粘土防膨剂。优选出质量分数为l%的FP-3A粘土防膨剂,静态评价离心法其防膨率为79.1%,X-射线衍射法防膨率为54.6%,膨胀仪法防膨率为80.7%,岩心线性膨胀率为0.73%,每100g静态吸附量0.29g;动态评价渗透率保留率大于70%,最佳注入质量分数为0.5%～1.0%,且渗透率波动范围小,防膨效果稳定且作用时间长,适于海上某油田注水开发应用。

Based on the offshore oil field reservoir characteristics,screening clay anti-swelling agent has very important significance to control damage of reservoir water-sensitive and ensure the sustainable and efficient development of entire field.Comprehensive considering the advantages of various evaluation methods of anti-swelling agents,this experiment combined static and dynamic experimental evaluation method to screen water injection clay anti-swelling agent for an offshore oil field.For the optimized FP-3A clay anti-swelling agent with the mass percentage of l%,the anti-swelling rate of static-evaluation centrifugal method is 79.1%,54.6% by X-ray diffraction method,80.7% by anti-swelling dilatometer method,core linear expansion rate is 0.73%,the amount of 0.29 g per 100 g static-adsorption.The retention rate of dynamic permeability is greater than 94.74%,the best injection concentration is 0.5% to 1.0%,and the penetration rate fluctuation is small,anti-swelling effect is stable and the acting time is long,it is suitable for the development of offshore oil field.