青海油田尕斯E31油藏为典型的高温高盐油藏,经过数十年开发,面临含水快速上升、产量快速递减、稳产难度大等开发难题,转换开发方式、实施减氧空气泡沫驱成为该油藏进一步提高采收率的重要技术方向,但常规发泡体系存在耐温抗盐性差的问题,在尕斯E31油藏不具备适用性。针对尕斯区块E31储层条件,以FC发泡剂(主要组分为十六烷基羟丙基磺基甜菜碱、十二烷基硫酸钠)为基础,通过对纳米SiO2颗粒进行聚苯乙烯改性合成得到新型泡沫稳定剂,两者复配形成FC-W耐温抗盐泡沫体系。静态评价实验表明:160 ℃时体系综合值为25 ℃时的90.9%,15×104mg/L矿化度下体系综合值为蒸馏水条件的94.8%,耐温性和耐盐性较FC泡沫体系显著提高。动态模拟显示:泡沫段塞后气驱,气驱波及体积可扩大9.4%。泡沫段塞后持续水驱,水驱采收率可继续提高20个百分点,体系扩大波及体积和提高洗油效率的能力突出。研究成果表明新型耐温抗盐泡沫体系在该油藏开展减氧空气泡沫驱具有良好的适应性。
Gasi E31 reservoir in Qinghai Oilfield is a typical high temperature and high salinity reservoir, and after decades of development, it faces development challenges such as rapid rise in water content, rapid decrease in production, and difficulty in stabilizing production. The conversion of the development method to oxygen-reduced air foam flooding has become an important technical direction for further recovery enhancement in this reservoir, but the conventional foaming system has the problem of poor temperature and salinity resistance, which is not applicable in Gasi E31 reservoir. Based on the FC foaming agent (the main components are cetyl hydroxypropyl sulfobetaine and sodium dodecyl sulfate), a new foam stabilizer is synthesized by polystyrene modification of nano-SiO2 particles, and the two are compounded to form FC-W temperature-resistant and salinity-resistant foam system. The static evaluation experiment shows that the comprehensive value of the system at 160 ℃ is 90.9% of that at 25 ℃, and the comprehensive value of the system at 15×104mg/L mineralization is 94.8% of that at distilled water, and the temperature resistance and salinity resistance are significantly higher than those of the FC foam system. The dynamic simulation shows that the air flooding sweep volume can be expanded by 9.4% when the air flooding is implemented after the foam plug. If the water flooding is continued after the foam plug, the water flooding enhanced recovery rate can continue to increase by 20 percent points, and the ability of the system to expand the sweep volume and improve the displacement efficiency is outstanding. The research results show that the new temperature-resistant and salinity-resistant foam system has good adaptability to the oxygen-reduced air foam flooding applied in this reservoir.
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