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Experimental Study on Reducing CO 2 –Oil Minimum Miscibility Pressure with Hydrocarbon Agents

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  • Junrong Liu

    (Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China
    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Lu Sun

    (Dongming Petroleum Distribution Company, Shandong Dongming Petrochemical Group Co., Ltd., Heze 274000, China)

  • Zunzhao Li

    (Dalian Petrochemical Research Institute, Dalian 116045, China)

  • Xingru Wu

    (Mewbourne School of Petroleum & Geological, The University of Oklahoma, 100 E. Body St. SEC1362, Norman, OK 73019, USA)

Abstract

CO 2 flooding is an important method for improving oil recovery for reservoirs with low permeability. Even though CO 2 could be miscible with oil in regions nearby injection wells, the miscibility could be lost in deep reservoirs because of low pressure and the dispersion effect. Reducing the CO 2 –oil miscibility pressure can enlarge the miscible zone, particularly when the reservoir pressure is less than the needed minimum miscible pressure (MMP). Furthermore, adding intermediate hydrocarbons in the CO 2 –oil system can also lower the interfacial tension (IFT). In this study, we used dead crude oil from the H Block in the X oilfield to study the IFT and the MMP changes with different hydrocarbon agents. The hydrocarbon agents, including alkanes, alcohols, oil-soluble surfactants, and petroleum ethers, were mixed with the crude oil samples from the H Block, and their performances on reducing CO 2 –oil IFT and CO 2 –oil MMP were determined. Experimental results show that the CO 2 –oil MMP could be reduced by 6.19 MPa or 12.17% with petroleum ether in the boiling range of 30–60 °C. The effects of mass concentration of hydrocarbon agents on CO 2 –oil IFT and crude oil viscosity indicate that the petroleum ether in the boiling range of 30–60 °C with a mass concentration of 0.5% would be the best hydrocarbon agent for implementing CO 2 miscible flooding in the H Block.

Suggested Citation

  • Junrong Liu & Lu Sun & Zunzhao Li & Xingru Wu, 2019. "Experimental Study on Reducing CO 2 –Oil Minimum Miscibility Pressure with Hydrocarbon Agents," Energies, MDPI, vol. 12(10), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:10:p:1975-:d:233620
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    References listed on IDEAS

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    1. Zuloaga, Pavel & Yu, Wei & Miao, Jijun & Sepehrnoori, Kamy, 2017. "Performance evaluation of CO2 Huff-n-Puff and continuous CO2 injection in tight oil reservoirs," Energy, Elsevier, vol. 134(C), pages 181-192.
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    Cited by:

    1. Hengli Wang & Leng Tian & Kaiqiang Zhang & Zongke Liu & Can Huang & Lili Jiang & Xiaolong Chai, 2021. "How Is Ultrasonic-Assisted CO 2 EOR to Unlock Oils from Unconventional Reservoirs?," Sustainability, MDPI, vol. 13(18), pages 1-15, September.

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