Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 1: 113 - 119

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.01.013

Reservoir Engineering

Study of the CO2-C2H6 enhanced crude oil extraction and miscibility

  • WANG Chengwei ,
  • SU Yuliang ,
  • WANG Wendong ,
  • LI Lei ,
  • HAO Yongmao
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  • 1. School of Petroleum Engineering,China University of Petroleum (East China),Qingdao,Shandong 266580, China;
    2. Key Laboratory of Unconventional Oil and Gas Development,Ministry of Education,China University of Petroleum (East China),Qingdao,Shandong 266580, China

Received date: 2024-03-12

  Revised date: 2024-11-07

  Online published: 2025-05-13

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Abstract

In response to the unclear understanding of the synergistic mechanism of CO2-C2H6 and the variation in miscibility during the tight reservoir development,high-temperature and high-pressure PVT device was utilized to conduct oil and gas phase behavior and extraction experiments.The study investigated the phase behavior and extraction characteristics between CO2-C2H6 mixture and crude oil,and simulated the occurrence status and the mixed-phase pressure change characteristics by molecular dynamics.The study shows that:compared with the injection of CO2 only,the addition of ethane results in a decrease of about 0.1% in the high carbon molecular weight percentage of crude oil.Ethane can effectively enhance the extraction capability of the injected gas on crude oil,transforming high carbon hydrocarbons into lower carbon hydrocarbons such as C5.Both CO2 and CO2-C2H6 mixture are capable of extracting C2,C4,and C6 from multi-component oil molecules into the gas phase,lowering the intermolecular forces in the oil phase and enhancing the mobility of crude oil.The diffusion and miscibility capabilities of the gas mixture in crude oil are stronger than those of pure CO2.The gas mixture is more likely to form miscibility with crude oil,thereby increasing the degree of oil production.This study provides theoretical guidance for the synergistic enhanced recovery technology of CO2-C2H6 gas mixture injection in tight oil reservoirs.

Key words： tight oil; molecular simulation; extraction; diffusion coefficient; CO2-C2H6 mixture

Cite this article

WANG Chengwei , SU Yuliang , WANG Wendong , LI Lei , HAO Yongmao . Study of the CO2-C2H6 enhanced crude oil extraction and miscibility[J]. Special Oil & Gas Reservoirs, 2025 , 32(1) : 113 -119 . DOI: 10.3969/j.issn.1006-6535.2025.01.013

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