Electric Field-Enhanced Oil Recovery Performance in Shale Inorganic Pores during CO2 Injection: A Molecular-Scale Study
DOI:
https://doi.org/10.54097/cx58mv16Keywords:
Electric field, Shale Inorganic Pores, Displacement EfficiencyAbstract
To solve the problems of strong crude oil adsorption and low displacement efficiency of conventional CO2 in shale inorganic pores, and to reveal the micro-mechanism of electric field-enhanced CO2 displacement of shale oil, this paper takes the widely developed quartz inorganic nano-pores in shale as the research object. A quartz-crude oil-CO2 micro-simulation system was constructed by adopting the method of molecular dynamics simulation combined with theoretical analysis, to systematically study the shale oil displacement effect and micro-interaction characteristics before and after applying electric field. By comparing the relative concentration distribution of crude oil molecules, the radial distribution function (RDF) of CO2 and crude oil, the wall-oil interaction energy, and the evolution law of molecular motion under the conditions of no electric field (without electric field) and with electric field (with electric field), the influence of electric field on the adsorption-desorption behavior of crude oil and CO2 displacement efficiency was quantitatively analyzed, and the molecular change characteristics at different time nodes (0.2 ns, 1 ns, 2 ns, 4 ns) were explored. The results show that the application of an external electric field can significantly weaken the adsorption between crude oil molecules and the quartz wall, reduce the interaction energy, promote the miscibility between CO2 and crude oil, and effectively strip the adsorbed crude oil in the pores; after applying the electric field, the displacement efficiency of quartz inorganic pores increases from 35.92% to 51.96%, with a difference of 9.79%. This paper clarifies the intrinsic mechanism of electric field-enhanced CO2 oil displacement at the molecular scale, improves the micro-theoretical system of electric field-assisted CO2 development of shale oil, and provides theoretical basis and technical support for the optimization of electric field synergistic displacement process parameters and on-site technology research and development in shale oil reservoirs.
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