Simulation of the multiphase molecular effect of polymer flooding oil

Xu, Jianping; Feng, Zhen; Yuan, Yuanda; Qin, Guowei; Zhang, Zhe

doi:10.1016/j.molliq.2023.123758

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Molecules 2024, 29, x FOR PEER REVIEW 6 of 20 lar simulation of polymer-assisted oil displacement for a deeper understanding. By studying the phenomenon of local aggregation of NPAM molecular chains in the polymer solution system, Xu [22] revealed the interaction process of multiphase molecules during polymer flooding, quantified the diffusion law of three kinds of molecules (polymer, oil, and water), and enriched the theoretical system of polymer flooding flow. Fan et al [23] from the University of Science and Technology of China (USTC) thoroughly investigated the dynamic process of the dead-end displacement of trapped oil droplets in nanopores through MD simulations.…”

Section: Analysis Of Polymer Driving Mechanismsmentioning

confidence: 99%

“…Some scholars have begun to shift their research focus to the molecular simulation of polymer-assisted oil displacement for a deeper understanding. By studying the phenomenon of local aggregation of NPAM molecular chains in the polymer solution system, Xu [ 22 ] revealed the interaction process of multiphase molecules during polymer flooding, quantified the diffusion law of three kinds of molecules (polymer, oil, and water), and enriched the theoretical system of polymer flooding flow.…”

Section: Application Of Molecular Modelling Techniques To Different A...mentioning

confidence: 99%

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Research Progress of Molecular Simulation in Acrylamide Polymers with High Degree of Polymerization

Liu,

Feng,

et al. 2024

Molecules

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Acrylamide polymers with a high degree of polymerization are widely used in petroleum production. It is of great significance to study the oil displacement mechanism of acrylamide polymers with a high degree of polymerization from the micro level. In recent years, the rapid development of computer molecular simulation technology has filed the gaps in macroscopic experiments and theories. This technology has been highly valued in the study of the molecular behaviour of polymer systems. In this paper, the research progress of molecular simulation applied to high-polymerization-degree acrylamide polymer is summarized. The application status of acrylamide polymer flooding, the analysis of polymer flooding mechanisms, and the research progress of molecular simulation in acrylamide linear and crosslinked polymers are expounded. Finally, the development prospect of acrylamide polymer research is given, and suggestions are put forward in terms of simulation direction and simulation tools.

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Section: Analysis Of Polymer Driving Mechanismsmentioning

confidence: 99%

Section: Application Of Molecular Modelling Techniques To Different A...mentioning

confidence: 99%

Research Progress of Molecular Simulation in Acrylamide Polymers with High Degree of Polymerization

Liu,

Feng,

et al. 2024

Molecules

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Molecular dynamics simulation of interaction between NaOH solution and AgCo/C electrode

Zeng,

Wang,

Zeng

et al. 2024

Journal of Molecular Liquids

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Construction of middle-phase microemulsion system and its micro-mechanism on displacing residual oil in low-permeability porous media

Wu,

Wang,

et al. 2024

Front. Chem.

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The application of medium-phase microemulsion in enhancing oil recovery technology represents a significant area of research, particularly for improving production in low-permeability reservoirs. The oil recovery can be increased to 80%~90%. In order to further improve the recovery rate of low-permeability reservoirs in the late stage of water flooding, a medium-phase microemulsion flooding system was constructed in this paper. The micro-displacement mechanism of the medium-phase microemulsion flooding system was clarified by experimental methods such as phase change and micro-remaining oil distribution. The ability of enhancing oil recovery and the mechanism of increasing oil production were discussed, which provided a basis for establishing a new method of enhancing oil recovery. This study utilizes a mixed surfactant system composed of sodium dodecyl benzene sulfonate and coconut oil fatty acid lipopolyoxyethylene betaine at a mass ratio of 1:3, with n-butanol serving as the cosurfactant. The fish phase diagram was instrumental in determining the critical concentration range for alcohol (1.3%–3.7%) necessary for the formation of middle-phase microemulsions, along with a corresponding surfactant mass concentration of 0.3%–0.7%. Key salinity thresholds for middle-phase formation and disappearance were identified at 1.5% and 6.0%, respectively. Optimal solubilization effects were observed at approximately 4.8% NaCl mass concentration, which effectively reduced interfacial tension to 10–3 mN/m. Under specific kinetic conditions, in-situ formation of middle-phase microemulsions occurs as surfactants interact with crude oil within reservoir pores. In comparison to traditional water flooding, middle-phase microemulsions enhance viscosity and create an oil wall at the forefront of displacement. This mechanism facilitates the aggregation and movement of residual oil, which is crucial for enhancing crude oil recovery. Moreover, middle-phase microemulsions exhibit strong solubilization capabilities, making them particularly effective for mobilizing oil in blind-end and unswept areas. The ultra-low interfacial tension achieved between the microemulsion and crude oil promotes the elongation and fragmentation of pore-trapped oil into smaller droplets, ultimately aiding in their displacement and recovery via micro-pore outlets. This unique interaction underscores the potential of middle-phase microemulsion flooding to optimize oil recovery processes, especially in challenging reservoir environments such as those encountered in the Changqing Oilfield formations.

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Simulation of the multiphase molecular effect of polymer flooding oil

Cited by 3 publications

References 7 publications

Research Progress of Molecular Simulation in Acrylamide Polymers with High Degree of Polymerization

Research Progress of Molecular Simulation in Acrylamide Polymers with High Degree of Polymerization

Molecular dynamics simulation of interaction between NaOH solution and AgCo/C electrode

Construction of middle-phase microemulsion system and its micro-mechanism on displacing residual oil in low-permeability porous media

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