Formulation Optimization of Oxygen-Reduced Air Flooding Foam System for High Temperature and High Salinity Reservoir in Gasi Block

doi:10.3969/j.issn.1006-6535.2023.05.016

Abstract

Abstract: 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.

Key words: oxygen-reduced air flooding, modified nanoparticles, temperature-resistant and salinity-resistant foam, high-temperature and high-salinity reservoir, Qinghai Oilfield

CLC Number:

TE357.46

Cheng Tao, Zhang Yi, Song Yingzhi, Dang Yangbin, Jia Zhiwei, Zhu Xiuyu, Pu Lantian, Shao Liming. Formulation Optimization of Oxygen-Reduced Air Flooding Foam System for High Temperature and High Salinity Reservoir in Gasi Block[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 121-126.

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