精细石油化工

渤海窄河道砂体以水平井注采为主,具有水驱方向单一的特点,导致优势通道发育,含水上升速度快。研究了以乳液聚合物凝胶、自聚集颗粒为主的组合调驱技术,利用非均质平板岩心模型,结合电阻测试数据开展了剩余油分布分析和增油效果评价。结果表明,乳液聚合物凝胶初始黏度较低,5 d后开始成胶;自聚集颗粒初始粒径为500 nm,随老化时间延长,3 000 mg/L下最终聚集体尺寸为2.5 μm;驱油剂1 500 mg/L浓度下界面张力达到8.42×10^-2mN/m。岩心实验表明,组合调驱实验下最终低渗层含油饱和度降低至45.3%,整体采收率增幅达到30.2%。目前,该技术已在渤海油田累计应用10井次,实现增油超4×10⁴ m³。

In Bohai oil field, narrow channel sand bodies are primarily managed through horizontal well injection and production, characterized by a single water-flood direction, leading to the development of dominant flow channels and a rapid increase in water content. To this end, a combination profile control and flooding technology based on emulsion polymer gel and self-aggregation particles control has been formed. In addition, residual oil distribution analysis and oil increase effect evaluation were carried out using heterogeneous flat core model and core resistance test data. The results showed that the initial viscosity of the emulsion polymer gel system was low, and the gel formation began after 5 days. The initial size of the self-aggregating particles is 500 nm, and as aging time increases, the final aggregate size at 3 000 mg/L concentration is 2.5 μm. The interfacial tension reached 8.42×10^-2 mN/m at a concentration of 1 500 mg/L of oil displacement agent. The core test shows that the oil saturation of the low permeability layer has decreased to 45.3%, and the overall recovery rate has increased to 30.2%. At present, the technology has been applied in a total of 10 wells in Bohai oil field, achieving an increase in oil production of over 4×10⁴ m³, significant water control and oil stabilization effects, and has good application prospects.