江汉油田高钙镁油藏新型聚驱实验研究

地层水中钙镁离子可以明显降低聚合物溶液的黏度,限制了普通聚合物驱在高钙镁油藏中的应用。以江汉油田某区高钙镁油藏作为研究对象,以新型抗钙镁聚合物为基础,开展高钙镁油藏聚合物驱实验研究。在高钙镁条件下采用蒸煮蒸馏水配制模拟盐水,母液稀释配制聚合物溶液;新型聚合物溶液具有较好的增黏、抗盐、抗钙镁、抗剪切、长期稳定性;分别在人造、露头和天然岩心上开展了新型聚合物驱油实验,水驱到含水90%后聚驱采收率增幅达8%以上。该研究为高钙镁油藏进一步开展聚合物驱矿场试验提供了理论指导。

Experimental Study on Novel Polymer Flooding in High Calcium and Magnesium Reservoir in Jianghan Field

Viscosity of polymer solution is decreased by formation water with calcium and magnesium ions, which restricts the application of ordinary polymer flooding in high calcium and magnesium reservoirs. In this paper, the high calcium and magnesium reservoir of Jianghan oilfield as a research object, experimental study of polymer flooding on calcium and magnesium reservoir was carried out based on novel polymer with calcium-magnesium-resistance groups. Under conditions of formation water with high calcium and magnesium ions, using distilled water to make simulation water and diluted mother polymer solution to required concentration. The novel polymer solution has good properties with stickness, salt resistance, calcium-magnesium resistance, sheer resistance and long-term stability. Then polymer flooding experiments were carried out on artificial, outcrop and natural cores respectively. Novel polymer flooding increases EOR more than 8% after water flooding as water cut up to 90%. The research provides theoretical guidance for further study of polymer flooding on high calcium and magnesium reservoir.