Displacement dynamics of trapped oil in rough channels driven by nanofluids

Chang, Yuanhao; Xiao, Senbo; Ma, Rui; Wang, Xiao; Zhang, Zhiliang; He, Jianying

doi:10.1016/j.fuel.2021.122760

Cited by 25 publications

(14 citation statements)

References 53 publications

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Section: Literature Review and Discussion On Different Oil Displaceme...mentioning

confidence: 99%

“…The reason is that NPs can effectively weaken the ability of hydrogen bond association between water molecules, so that the fluid is easier to enter the low permeability region that cannot be affected by conventional water injection, thus achieving EOR. Chang et al 173 investigated the oil displacement potential of different NPs (hydrophilic NPs, Janus NPs, and lipophilic NPs) from a microscopic perspective. The results display that hydrophilic and Janus NPs can displace more trapped oil from rough channels, while hydrophobic NPs have weak displacement ability and threaten the possibility of channel clogging.…”

Section: Nanosized Oil Displacement Agentmentioning

confidence: 99%

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Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Wang

Han

et al. 2023

Energy Fuels

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Despite rapid advances in renewable energy extraction and utilization, global oil demand continues to rise. Oil displacement technologies are widely studied and applied because they can extract more oil in depleted reservoirs or recover unconventional ones. This study introduces research methods and mechanisms of four oil displacement technologies, i.e., water flooding, chemical flooding, gas flooding, and steam flooding. Although oil displacement technologies are helping to meet the growing demand for oil and energy, there are still some challenges for industrial applications. Some agents adopted in the oil displacement have shortcomings in the corrosion of mining equipment and damage to the reservoir structure. Therefore, solutions to the problem are crucial and are investigated widely in the literature using experiments and simulations. For experimental research, a diffusion framework for studying mass transfer in the oil displacement process and an experimental system for simulating oil displacement in offshore reservoirs should be built, which will facilitate the widespread industrial application of oil displacement technology. Therefore, it is necessary to improve the accuracy and expand the application range of the experimental system. As for numerical simulation, reaction kinetics research is essential for selecting displacement agent materials and preventing harmful gas leakage for industrial applications. However, the dynamics of foam flooding and CO2 flooding are not thoroughly studied. Moreover, it is an acceptable research topic that reducing the uncertainty of discrete regions is an effective method to improve the accuracy of numerical simulation results. For the broader application of oil displacement technology to industry, several mechanisms regarding the research field could be studied more thoroughly and comprehensively in the future, i.e., (1) the influence mechanisms of some impurities and complex reservoir physical properties, (2) the method of combining various oil displacement technologies, (3) the T-H-M-C multifield coupling oil displacement mechanism at micro/nanoscale, (4) the cement failure mechanism caused by CO2 and H2S, and (5) the tube brittle fracture mechanism caused by stress corrosion. For the sustainable development and efficient utilization of oil displacement, this review summarizes the extensive information about four oil displacement technologies, thus encouraging and providing research topics for further development and applications.

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Section: Literature Review and Discussion On Different Oil Displaceme...mentioning

confidence: 99%

Section: Nanosized Oil Displacement Agentmentioning

confidence: 99%

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Wang

Han

et al. 2023

Energy Fuels

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“…9,10 Despite extensive attempts on thermal recovery, chemical flooding, and water flooding, applications are limited due to abominable reservoir conditions, high costs, and damage to the formation. 11,12 Gas (such as CO 2 , N 2 , and natural gas) injection-enhanced oil recovery is gradually appreciated due to their environmental protection and high efficiency. 13−15 Compared with other gases, CO 2 is supercritical under high-temperature and pressure conditions in shale reservoirs, possessing tremendous advantages and unique properties, such as a high diffusion rate and favorable dissolution capacity.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Under the current situation of increasingly depleted resources, traditional oil resources are gradually unable to satisfy the increasing energy requirement. − It is reported that shale oil accounts for a large proportion of the total energy supply as the conventional oil production gradually declines in recent years. Therefore, the development of shale oil plays a crucial role in alleviating the current problem of energy shortage. , Shale reservoirs are typical multi-scale porous media, in which the nanopores are extremely developed and have ultra-low permeability, making it difficult to exploit. − Multifarious approaches have been employed to improve the recovery of shale oil, such as chemical flooding, gas injection, thermal recovery, and smart water flooding. , Despite extensive attempts on thermal recovery, chemical flooding, and water flooding, applications are limited due to abominable reservoir conditions, high costs, and damage to the formation. , Gas (such as CO 2 , N 2 , and natural gas) injection-enhanced oil recovery is gradually appreciated due to their environmental protection and high efficiency. − Compared with other gases, CO 2 is supercritical under high-temperature and pressure conditions in shale reservoirs, possessing tremendous advantages and unique properties, such as a high diffusion rate and favorable dissolution capacity. , Because of these properties, CO 2 injection is regarded as an extremely promising EOR method. Meanwhile, CO 2 EOR realizes the utilization and sequestration of carbon, reducing CO 2 gas emissions and thus mitigating the greenhouse effect. − …”

Section: Introductionmentioning

confidence: 99%

Effects of Shale Pore Size and Connectivity on scCO₂ Enhanced Oil Recovery: A Molecular Dynamics Simulation Investigation

et al. 2023

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The differences in pore width distributions and connectivity of shale reservoirs have significant influences on supercritical carbon dioxide (scCO 2 )-enhanced oil recovery (CO 2 EOR) in shale. Herein, the molecular dynamics simulation was adopted to investigate the microscopic mechanism of CO 2 EOR in the shale nanopores with different pore size width distributions and pore connectivity. The results show that the pore connectivity has significant effects on the oil displacement, and the recovery efficiency is ordered as: connected pore > double pore > single pore for the 3 nm pore, which are 91.32, 74.43, and 65.93%, respectively. Therefore, the increase in pore connectivity can significantly improve the recovery efficiency of the small pore of the connected pore system. For the shale reservoirs with different pore width distributions, the oil recovery rate of large pores is generally higher than that of small pores. In addition, the displacement of oil in the small pore of the double pore system is accelerated due to the pushing effect of the discharge fluid from the large pore. The results furnish a certain theoretical support for the research of the microscopic mechanism of CO 2 EOR in the shale pore with different pore width distributions and connectivity and the exploit of shale oil.

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“…Nanofluid is a kind of nanomaterial [14,15] that can be adsorbed on the core surface to change its microscopic pore structure and wettability. Nanofluid has been widely used in oil and gas reservoirs [16][17][18][19][20][21][22][23][24][25][26] because its exceptional properties. At present, they are mainly involved in oil and gas exploitation, including profile control and water plugging, [9,26] pressure-reducing and increasing injection, [27,28] improving water flooding to enhance oil recovery (EOR), [29][30][31] and so on.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the drainage gas recovery of an environmentally friendly nanofluid in tight gas reservoirs

Qin

Qingping

et al. 2022

Can J Chem Eng

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The efficiency of gas recovery in tight gas reservoirs has been a challenge in the oil and gas industry for the past decade because conventional drainage or watercontrolled gas recovery technologies typically have poor performance in low-permeability reservoirs. To solve this problem, self-made nanofluid was introduced to enhance drainage gas recovery in a tight gas reservoir. In this paper, nanofluid was prepared by phase reversal technology for application in a tight gas reservoir.Its thermal, acidic, alkaline, and salty stabilities were systematically investigated by using light transmittance as a shortcut index. At the same time, its biodegradability and biotoxicity were evaluated based on the industry/national standard, and the effectiveness of its drainage gas recovery was studied by dynamic gaswater percolation. The results showed that the self-made nanofluid can be effectively used for drainage gas recovery in tight gas reservoirs. The nanofluid has chemical stability and is environmentally friendly, which fully conforms to the contemporary development trend of the oil and gas industry. The nanofluid can shift the isotonic point of the gas-water relative permeability to the left (its minimum is 1.83% at 6.25 wt.% and maximum is 4.78% at 100 wt.%) and reduce the irreducible water saturation (its minimum is 8.84% at 6.25 wt.% and maximum is 4.28% at 100 wt.%), achieving the purpose of the enhancement of drainage gas recovery. The research results provide technical support for the application of nanofluid to improve the gas production in tight gas reservoirs.

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Displacement dynamics of trapped oil in rough channels driven by nanofluids

Cited by 25 publications

References 53 publications

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Effects of Shale Pore Size and Connectivity on scCO₂ Enhanced Oil Recovery: A Molecular Dynamics Simulation Investigation

Experimental study on the drainage gas recovery of an environmentally friendly nanofluid in tight gas reservoirs

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Displacement dynamics of trapped oil in rough channels driven by nanofluids

Cited by 25 publications

References 53 publications

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Effects of Shale Pore Size and Connectivity on scCO2 Enhanced Oil Recovery: A Molecular Dynamics Simulation Investigation

Experimental study on the drainage gas recovery of an environmentally friendly nanofluid in tight gas reservoirs

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Effects of Shale Pore Size and Connectivity on scCO₂ Enhanced Oil Recovery: A Molecular Dynamics Simulation Investigation