Potential and challenges for the new method supercritical CO2/H2O mixed fluid huff-n-puff in shale oil EOR

Li, Lei; Zhou, Xiaomei; Su, Yuliang; Xiao, Pufu; Cui, Meng; Zheng, Jianyang

doi:10.3389/fenrg.2022.1041851

Cited by 3 publications

(1 citation statement)

References 46 publications

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“…Under experimental conditions, the CO 2 gas reached a supercritical state with little interfacial tension with crude oil, excellent oil washing efficiency, and small capillary resistance. It could enter the pore throat where water could not enter and drove out crude oil [23,24].…”

Section: Huff-n-puff Cyclementioning

confidence: 99%

Mechanism and Main Control Factors of CO2 Huff and Puff to Enhance Oil Recovery in Chang 7 Shale Oil Reservoir of Ordos Basin

Wang,

Xu,

Chen

et al. 2023

Processes

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The Chang 7 shale oil reservoir has low natural energy and is both tight and highly heterogeneous, resulting in significant remaining oil after depletion development. CO2 huff and puff (huff-n-puff) is an effective way to take over from depletion development. Numerous scholars have studied and analyzed the CO2 huff-n-puff mechanism and parameters based on laboratory core sample huff-n-puff experiments. However, experimental procedures are not comprehensive, leading to more general studies of some mechanisms, and existing CO2 huff-n-puff experiments struggle to reflect the effect of actual reservoir heterogeneity due to the limited length of the experimental core samples. In this paper, CO2 huff-n-puff laboratory experiments were performed on short (about 5 cm) and long (about 100 cm) core samples from the Chang 7 shale oil reservoir, and the microscopic pore fluid utilization in the short samples was investigated using a nuclear magnetic resonance (NMR) technique. We then analyzed and discussed the seven controlling factors of CO2 huff-n-puff and their recovery-enhancing mechanisms. The experimental results show that the cumulative recovery increased with the number of huff-n-puff cycles, but the degree of cycle recovery decreased due to the limitation of the differential pressure of the production. The significant increase in recovery after the CO2 mixed-phase drive was achieved by increasing the minimum depletion pressure as well as the gas injection amount. The soaking time was adjusted appropriately to ensure that the injected energy was thoroughly utilized; too short or too long a soaking time was detrimental. The pressure depletion rate was the main factor in the CO2 huff-n-puff effect in shale. If the pressure depletion rate was very high, the effective permeability loss was larger. In the CO2 huff-n-puff process of the Chang 7 shale oil reservoir, the improvement in oil recovery was mainly contributed to by mesopores and small pores. The huff-n-puff experiments using long cores could better characterize the effect of heterogeneity on the huff-n-puff effect than short cores.

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Section: Huff-n-puff Cyclementioning

confidence: 99%

Mechanism and Main Control Factors of CO2 Huff and Puff to Enhance Oil Recovery in Chang 7 Shale Oil Reservoir of Ordos Basin

Wang,

Xu,

Chen

et al. 2023

Processes

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Investigation on the flow behavior and mechanisms of water flooding and CO2 immiscible / miscible flooding in shale oil reservoirs

Lu,

Qian,

Zhong

et al. 2024

Journal of CO2 Utilization

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A Review of Carbon Capture and Valorization Technologies

et al. 2023

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Global fossil fuel consumption has induced emissions of anthropogenic carbon dioxide (CO2), which has emanated global warming. Significant levels of CO2 are released continually into the atmosphere from the extraction of fossil fuels to their processing and combustion for heat and power generation including the fugitive emissions from industries and unmanaged waste management practices such as open burning of solid wastes. With an increase in the global population and the subsequent rise in energy demands and waste generation, the rate of CO2 release is at a much faster rate than its recycling through photosynthesis or fixation, which increases its net accumulation in the atmosphere. A large amount of CO2 is emitted into the atmosphere from various sources such as the combustion of fossil fuels in power plants, vehicles and manufacturing industries. Thus, carbon capture plays a key role in the race to achieve net zero emissions, paving a path for a decarbonized economy. To reduce the carbon footprints from industrial practices and vehicular emissions and attempt to mitigate the effects of global warming, several CO2 capturing and valorization technologies have become increasingly important. Hence, this article gives a statistical and geographical overview of CO2 and other greenhouse gas emissions based on source and sector. The review also describes different mechanisms involved in the capture and utilization of CO2 such as pre-combustion, post-combustion, oxy-fuels technologies, direct air capture, chemical looping combustion and gasification, ionic liquids, biological CO2 fixation and geological CO2 capture. The article also discusses the utilization of captured CO2 for value-added products such as clean energy, chemicals and materials (carbonates and polycarbonates and supercritical fluids). This article also highlights certain global industries involved in progressing some promising CO2 capture and utilization techniques.

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Potential and challenges for the new method supercritical CO2/H2O mixed fluid huff-n-puff in shale oil EOR

Abstract: Zheng J (2022), Potential and challenges for the new method supercritical CO 2 /H 2 O mixed fluid huffn-puff in shale oil EOR.

Cited by 3 publications

References 46 publications

Mechanism and Main Control Factors of CO2 Huff and Puff to Enhance Oil Recovery in Chang 7 Shale Oil Reservoir of Ordos Basin

Mechanism and Main Control Factors of CO2 Huff and Puff to Enhance Oil Recovery in Chang 7 Shale Oil Reservoir of Ordos Basin

Investigation on the flow behavior and mechanisms of water flooding and CO2 immiscible / miscible flooding in shale oil reservoirs

A Review of Carbon Capture and Valorization Technologies

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