马岭北三区低渗透油藏二元驱室内实验研究

An Experiment Study on Polymer-surfactant Flooding for Bei3 Region Low Permeability Reservoir in Maling Oilfield

室内通过北三区高矿化度注入水配二元体系增黏性、界面张力评价及注入量、注入方式对驱油效率的影响试验,研究北三区延10低渗透高矿化度油藏储层特性对二元驱的适应性。实验结果表明二元体系具有较好的增黏性,与北三区油水能形成超低油水界面张力,室内岩心驱油效率提高15%以上;多段塞注入,注入量越大,提高驱油效率越高。室内实验研究表明,选择与孔喉匹配的聚合物形成的二元体系,可在低渗透油藏开展驱油试验。建议选择高低不同分子量聚合物分别与表活剂形成二元体系,段塞注入,能封堵大孔道,且不会发生堵塞。

Through the investigation, the polymer - surfactant flooding brings good effect of increasing oil production in the high permeability reservoir. Through analyzing viscosity of polymer - surfactant with high salinity water and interfacial tension, oil displacement experiment of low permeability cores, the influence of injection volume and in- jection mode for oil displacement efficiency, to study the adaptability of Y10 reservoir character and fluid of Bei3 Region with polymer - surfactant flooding. The experiments show polymer - surfaetant system has better viscosity, and form ultra low interracial tension with oil of Bei3 Region. In the laboratory oil displacement efficiency of core in- creases greater than 15%. Multiple section injection and the greater amount of injection, improving the oil displace- ment efficiency is higher. Experimental results show that selecting suitable polymer, polymer - surfactant flooding is suitable for low permeability reservoir. Suggesting to choose different molecular polymer, polymer - surfactant sys- tem can plug big pore, and be injected into the well too.