Effect of supercritical carbon dioxide adsorption on oil displacement in tight reservoir

Cao, Guangwen; Bai, Yujie; Nan, Xiaohan; An, Hongxin; Wang, Lei; Du, Tong; Li, Dan

doi:10.1016/j.csite.2021.100880

Cited by 9 publications

(3 citation statements)

References 20 publications

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“…Cao et al found that the hydrophilicity of rocks is improved after CO 2 contact with rocks, which makes crude oil separated from rocks. However, rocks do not necessarily become more hydrophilic.…”

Section: Co2 Floodingmentioning

confidence: 99%

Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Fu,

Shao,

Shao

et al. 2023

Energy Fuels

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Section: Co2 Floodingmentioning

confidence: 99%

Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Fu,

Shao,

Shao

et al. 2023

Energy Fuels

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“…Table 2 lists the moisture of different samples for SEM. Some reports also showed the preference of measuring rock porosity by water invasion porosity technique (Cao et al 2021;Kuila et al 2014), but it is not accurate when shale samples swell. According to measurement, the water invasion volume per unit of sample (D4 disc sample) reaches 0.01298 cm 3 /g, less than the surveyed dry powder sample 0.016134cm 3 /g.…”

Section: Water Invasion Test and Low Temperature N 2 Adsorption Experimentsmentioning

confidence: 99%

Moisture influence on organic pore structure of shale

Ning

Kang

2021

Arab J Geosci

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In lots of reports, improvement of shale percolation ability by shale-hydration has been reported, some researchers even regard low hydraulic fluid flowback rate as an advantage; they mainly focused on inorganic pores and fractures because brittleness of inorganic minerals decides the fracturing effects, but organic pores occupy large proportion of shale pores. In order to discover the moisture influence on organic pores, we prepare 4 samples by adjusting water content reaching 9.37%, 35.97%, 61.6%, and 80.45% and observe and quantitatively analyze 10,343 pore changes before and after processing of the 4 samples through SEM and image processing software, respectively, meanwhile, match the incremental water invasion rate curve with the dry pore size distribution curve. We also compare the water invasion mass of normal shale sample and organic partially removed sample. This paper first visually observes and counts the influence of hydration on organic shale pores through analysis of pore number, diameter, kurtosis, median, area, and characteristic lengths; discovers hydration and dehydration jointly cause the expected changes; the whole procedure contains two opposite mechanisms, pore closure or deformation caused by squeeze and enlarged pores or newborn fractures caused by water flush. Based on experimental and analysis results, conclusions are drawn that organic pores can be influenced by moisture, water flush and clay hydration expansion work jointly, and water flush function is weak when moisture is low, but it becomes stronger with the sufficient moisture. Therefore, sufficient soak time is beneficial to development.

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“…Global warming and insufficient energy supply have aroused interest in enhanced oil recovery (EOR) with CO 2 and CO 2 capture, utilization and storage (CCUS). − Injection of CO 2 into oil reservoirs known as CO 2 -enhanced oil recovery (EOR) can not only help to store the CO 2 but also improve the recovery of crude oil. − Hence, this process is considered to be the most cost-effective CCUS technique and has been widely used in the development of oilfields. , In CO 2 injection EOR projects, CO 2 diffuses into the formation and helps improve oil recovery by reducing the crude oil viscosity, supplementing the formation energy, swelling oil volume, and reducing the interfacial tension. , Studies have shown that the in situ mass transfer between CO 2 and heavy oil under reservoir conditions is dominated by molecular diffusion and dispersion. , The magnitude of molecular-diffusion coefficients affects the time for the heavy oil to achieve desirable viscosity reduction and swelling effect, thus influencing the oil-production response. , Therefore, the determination of CO 2 diffusion coefficient has extremely important guidance on CO 2 -EOR risk assessment, engineering design, and economic evaluation. , …”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of CO₂ Diffusion in a Multiliquid-Phase System Using Moving Mesh Technology

Chen

Liu

et al. 2023

Energy Fuels

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CO2 diffusion plays an important role in many CO2 injection techniques. But CO2 diffusion in multiliquid-phase systems has not been thoroughly investigated. Here multiliquid-phase system refers to the liquid system coexisting water, light oil, and heavy oil phases. This study investigates the CO2 concentration and the induced oil expansions when CO2 diffuses in a multiliquid-phase system. First, the mathematical model is developed based on the location of the CO2 diffusion front in the multiliquid-phase system. Second, the corresponding numerical model is established for different diffusion stages. To accurately describe the swelling of two oils, we employ the moving mesh technology to monitor the movement of two interfaces. Finally, CO2 concentration profiles, the induced oil swelling, and the movement of the CO2 front are studied by coding the developed numerical model. The results demonstrate that the CO2 concentration distribution and the induced oil swelling exhibit different performances in various phases at different diffusion stages. So it is necessary to divide the diffusion stage when studying the CO2 diffusion in a multiliquid-system. CO2 diffusion results in 19.52% and 17.21% expansion for light and heavy oil, respectively.

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Effect of supercritical carbon dioxide adsorption on oil displacement in tight reservoir

Cited by 9 publications

References 20 publications

Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Moisture influence on organic pore structure of shale

Numerical Simulation of CO₂ Diffusion in a Multiliquid-Phase System Using Moving Mesh Technology

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Effect of supercritical carbon dioxide adsorption on oil displacement in tight reservoir

Cited by 9 publications

References 20 publications

Application and Research Progress of CO2 Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Application and Research Progress of CO2 Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Moisture influence on organic pore structure of shale

Numerical Simulation of CO2 Diffusion in a Multiliquid-Phase System Using Moving Mesh Technology

Contact Info

Product

Resources

About

Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Numerical Simulation of CO₂ Diffusion in a Multiliquid-Phase System Using Moving Mesh Technology