濮城西区沙二上²⁺³油藏微球/表面活性剂复合驱应用研究

Applied Research on Micro-Ball/Surfactant Combination Flooding in Upper Sha 2²⁺³ in West Pucheng

摘要: 濮城油田西区沙二上²⁺³油藏目前处于特高含水期，需开展微球/表面活性剂复合驱进一步提高采收率。室内研究表明：浓度为0.2%~0.4%时，研制的表面活性剂与濮城沙二上²⁺³原油界面张力达10⁻³ mN/m；研究微球粒径与地层匹配关系，微球粒径与孔喉直径之比为0.575~0.81时可对地层形成有效封堵；应用微球初始粒径0.932 μm，膨胀后4.22 μm，适应濮城西区沙二上²⁺³油藏。矿场实验表明，微球/表面活性剂复合驱能够大幅度提高濮城西区沙二上²⁺³油藏原油采收率，可进一步在同类油藏进行推广应用。

Abstract: The upper sha 2²⁺³ in west pucheng is in ultra-high water cut stage, and the study on micro-ball/ surfactant combination flooding to enhance oil recovery is necessary. The research in lab shows that the interfacial tension (IFT) can reach 10⁻³ mN/m between surfactant and oil of reservoir when concentration is 0.2% - 0.4%. It was studied to find the matching relationship between the diameter of micro-ball and the formation. When the ratio between the diameter of Micro-ball and the diameter of pore throat is 0.575 - 0.81, it can effectively block the formation. The initial partical size of Micro-ball is 0.932 μm and can reach 4.22 μm after expansion; this can adapt to the reservoir of upper sha 2²⁺³ in west pucheng. The field tests show that combination flooding can remarkably enhance the recovery of oil in upper sha 2²⁺³ in west pucheng, and then this technology can be applied to other similar oil reservoir.