海上某油田防膨剂的筛选与评价

Selection and Evaluation of Inhibitor for Offshore Oil Field

针对海上油田储层特点筛选黏土防膨剂,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长处,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黏土防膨剂。对于优选出质量分数为1%的FP-3A黏土防膨剂,静态评价离心法防膨率为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100 g静态吸附量0.29 g;动态评价渗透率保留率大于70%,最佳注入浓度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。

It is very important to select clay anti-swelling agents according to the reservoir characteristics in offshore oil field, and significant to control reservoir damage and protect water-sensitive reservoir to guarantee sustainable and efficient development of the entire field. Through comprehensive evaluation with static and dynamic experimental evaluation, with various evaluation methods on anti-swelling agent, clay anti-swelling agents for water injection in offshore oil field have been selected. For the optimized FP-3A clay anti-swelling agent with mass fraction of 1%, centrifugal expansion rate is 79.1% with static evaluation method, and 54.6% by X-ray diffraction method, 80.7% by dilatometer method, and core linear expansion rate is 0.73%. The static adsorption amount is 0.29 g per 100 g. The permeability retention rate is greater than 70% with dynamic evaluation method, and the best injection concentration is 0.5% to 1.0%. In addition, the range of permeability change is small, and the anti-swelling effect is stable for a long period of time. Therefore, FP-3A clay anti-swelling agent is suitable for the development of offshore oil field.