海上油田泡沫堵水体系优选及适应性评价

Optimal Selection and Adaptability Evaluation of Water Plugging Foam Agent Used in Offshore Oilfield

油井出水是油田开収过程中不可避免的问题,影响油井产量,控水稳油是改善油田开収效果的关键。通过室内评价实验,对渤海油田现场使用的SD型起泡剂进行了评价,优选出最佳使用浓度为1.0%;为了增强泡沫稳定性,对常用的两种聚合物进行对比分析,得到浓度为0.1%的HK海水速溶型聚合物稳泡性能较好,泡沫堵剂体系为1.0%SD型起泡剂+0.1%HK海水速溶型聚合物;通过三层非均质岩心模型,对泡沫堵剂体系的适用性进行研究,结果表明:当油藏低渗基础渗透率为500×10-3μm2,渗透率级差为5~10倍,原油黏度低于100 mPa·s时,实验所得泡沫堵剂具有较好的适用性,能够有效降低含水率、提高原油采出程度。

Water channeling is an unavoidable problem in the process of oilfield development,which affects the production of oil well.Water plugging is a key method for improving oilfield development effect.SD type foaming agent used in Bohai oilfield was evaluated through experimental method.The optimized concentration of the foaming agent was 1.0%.In order to enhance the foam stability,two polymers were evaluated.The HK type polymer foam with concentration of 0.1%was better.The formula of foam plugging agent was determined as 1.0%SD foaming agent and 0.1%HK polymer.The applicability of the foam plugging agent was evaluated through the three-layer heterogeneous core.The results showed that when the permeability contrast was from 5 to 10,the crude oil viscosity was less than 100 mPa·s,the foam plugging agent had good applicability reducing the water cut effectively,and improving the oil recovery.