耐温耐盐无机调剖剂的室内研究

Lab research on temperature and salt resistant inorganic profile control agent

通过室内实验研究了水玻璃在高温、高矿化度下的热敏、盐敏现象及其影响因素;采用岩心物理模拟方法,研究了水玻璃在高温、高矿化度下的封堵能力及驱油性能。结果表明,水玻璃在高温下能自身生成白色沉淀,并且沉淀量受水玻璃模数、温度及时间的影响;水玻璃与高矿化度地层水作用不仅能产生大量沉淀,有效封堵地层中的大孔道,而且可以形成高粘物质,增加水的粘度,减小水油流度比;水玻璃在高温、高矿化度下有较好的封堵效果和驱油效果,能够进一步提高原油采收率。

This paper discusses the temperature - sensitive and salt - sensitive phenomena of sodium silicate under high temperature and high salinity and the influential factors based on lab tests. The plugging ability and displacement efficiency of sodium silicate under high temperature and high salinity are studied with the application of physical simulation of cores. The research results indicate that under high temperature sodium silicate will yield white precipitation, and the precipitation volume is affected by temperature, time and modulus of sodium silicate. The reaction between sodium silicate and high salinity formation water can not only yield much precipitation to plug the high permeability zone in formation, but also can form high viscosity materials to increase the viscosity of water and decrease water - oil mobility ratio. Under high temperature and high salinity, the plugging result and oil displacement results of sodium silicate are better, and the oil recovery factor can be further improved.