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An online physical simulation method for enhanced oil recovery by air injection in shale oil

Petroleum Exploration and Development 2023年第4期50卷 909-923页

作者： DU Meng LYU Weifeng YANG Zhengming JIA Ninghong ZHANG Jigang NIU Zhongkun LI Wen CHEN Xinliang YAO Lanlan CHANG Yilin JIANG Sirui HUANG Qianhui University of Chinese Academy of Sciences Beijing 100049China Institute of Porous Flow&Fluid Mechanics Chinese Academy of SciencesLangfang 065007China Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China State Key Laboratory of Enhanced Oil Recovery Beijing 100083China

In order to understand the mechanism of air flooding shale oil, an online physical simulation method for enhanced shale oil recovery by air injection was established by integrating CT scanning and nuclear magnetic resonance(NMR). The development effect of shale oil by air flooding under different depletion pressures, the micro-production characteristics of pore throats with different sizes and the mechanism of shale oil recovery by air flooding were analyzed. The effects of air oxygen content, permeability, gas injection pressure, and fractures on the air flooding effect in shale and crude oil production in pores with different sizes were analyzed. The recovery of shale oil can be greatly improved by injecting air into the depleted shale reservoir, but the oil displacement efficiency and the production degree of different levels of pore throats vary with the injection timing. The higher the air oxygen content and the stronger the low-temperature oxidation, the higher the production degree of pores with different sizes and the higher the shale oil recovery. The higher the permeability and the better the pore throat connectivity, the stronger the fluid flow capacity and the higher the shale oil recovery. As the injection pressure increases, the lower limit of the production degree of pore throats decreases, but gas channeling may occur to cause a premature breakthrough;as a result, the recovery increases and then decreases. Fractures can effectively increase the contact area between gas and crude oil, and increase the air sweep coefficient and matrix oil drainage area by supplying oil to fractures through the matrix, which means that a proper fracturing before air injection can help to improve the oil displacement effect under a reasonable production pressure difference.

关键词： shale oil air flooding CT scanning nuclear magnetic resonance EOR physics simulation

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