The characteristics of CO2 front dynamic migration in low permeability sandstone oil reservoirs under different miscibility degrees

IF 1.5 Q3 GEOSCIENCES, MULTIDISCIPLINARY Geosystem Engineering Pub Date : 2023-04-13 DOI:10.1080/12269328.2023.2199745

Yong-Su Jin, Zhilin Wang, Zhenxin Zhang, Bo Lin, Zhengjun Ge, Qidong You, Hao Chen, Xiliang Liu, Chenghao Xu, Shuaiqiang Gao, Yi Wu, Zafarullah Abro

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Abstract

ABSTRACT CO2 flooding is a significant technology for oil recovery, to reveal the microcosmic mechanism of CO2 flooding, CO2 slim tube experiments, long core CO2 flooding experiments, gas chromatography analysis experiments, and numerical simulations were carried out. The results show that the miscibility increase can improve the effect of dissolution and diffusion in the CO2-crude oil system, easing the CO2 finger entry phenomena, and delaying gas breakthrough time. Besides, the CO2 -crude oil interaction is enhanced by increasing the pressure difference between the injection well and the production well, which improves the oil recovery of CO2 flooding. Besides, CO2 carries the light and medium components (C4 ~ 25) forward to cross the first miscible zone, which makes the CO2-crude oil system form double miscible zones. This study reveals the rule of CO2 front and light components front under different miscibility degrees of CO2 flooding from the microscopic perspective and deepens the theory of CO2 flooding in low-permeability sandstone reservoirs.

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不同混相程度下低渗透砂岩油藏CO2前缘动态运移特征

CO2驱油是一项重要的采油技术，为揭示CO2驱油的微观机理，开展了CO2细管实验、长岩心CO2驱油实验、气相色谱分析实验和数值模拟等研究。结果表明，增加混相可以改善CO2-原油体系的溶解和扩散效果，缓解CO2“指状”进入现象，延迟气侵时间。另外，通过增大注采井的压差，可以增强CO2与原油的相互作用，提高CO2驱的采收率。另外，CO2携带轻、中组分(C4 ~ 25)向前穿越第一混相带，使CO2-原油体系形成双混相带。本研究从微观角度揭示了不同混相程度CO2驱油时CO2前缘和轻组分前缘的规律，深化了低渗透砂岩储层CO2驱油理论。

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Geosystem Engineering GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

2.70

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0.00%

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