Experimental Study on Direct Current Enhanced Oil Recovery Technology for Tight Reservoirs

doi:10.3969/j.issn.1006-6535.2023.03.011

Abstract

Abstract: To address the problem of poor development due to difficult water injection in tight oil, the application of DC electric field is proposed to enhance the recovery of tight oil. Taking the tight sandstone core of the Upper Triassic Yanchang Formation in the Ordos Basin as the research object, the DC electric field displacement effect and the mechanism of action were investigated through DC electric field constant velocity displacement experiments, wetting angle measurements and XRD test experiments. The study shows that the DC electric field enhanced recovery rate of tight oil is positively correlated with the electric field intensity; the development effect when the DC electric field is applied at the beginning of water flooding is better than that when the DC electric field is applied after the end of water flooding, both of which can increase the average recovery rate through water flooding by 29.06 and 14.68 percentage points respectively at 10 V; the recovery rate is accelerated after the DC electric field is applied; the DC electric field can not only reduce the flow resistance through electroosmotic flow to decrease the difficulty of water injection, but also enhance the hydrophilicity of the rock through electrochemical reaction to improve the oil displacement efficiency. The study provides a new idea for the efficient development of tight oil.

Key words: DC electric field, tight sandstone, water content, wettability, enhanced oil recovery

CLC Number:

TE312

Jia Zejiang, Ning Zhengfu, Zhang Wentong, Mao Zhu, Wang Zhipeng, Cheng Zhilin. Experimental Study on Direct Current Enhanced Oil Recovery Technology for Tight Reservoirs[J]. Special Oil & Gas Reservoirs, 2023, 30(3): 88-96.

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