Pore-scale investigation of residual oil distributions and formation mechanisms at the extra-high water-cut stage

Zhu, Guangpu; Ye, Jun; Zhang, Lei; Sun, Hai; Li, Aifen; Zhang, Kai

doi:10.1360/n972017-00392

Cited by 22 publications

(3 citation statements)

References 11 publications

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“…By establishing a porous media model based on scanning electron microscope images, including onshore oil fields [18] and offshore oil fields [19], flow characteristics at different pressures are analyzed [20][21][22].…”

Section: Pore Model Analysismentioning

confidence: 99%

A Comprehensive Study on the Process of Greenhouse Gas Sequestration Based on a Microporous Media Model

Wang¹,

Zhang²,

Zhang³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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Carbon dioxide geological sequestration is an effective method to reduce the content of greenhouse gases in the atmosphere of our planet. This process can also be used to improve the production of oil reservoirs by mixing carbon dioxide and crude oil. In the present study, a differential separation experiment (DL) based on actual crude oil components is used to simulate such a process. The results show that after mixing, the viscosity and density of reservoir fluid decrease and the volume coefficient increase, indicating that the pre buried gas induces fluid expansion and an improvement of the fluid rheological properties. These effects are interpreted using a pore scale model based on real scanning electron microscopy (SEM). The results show that increasing the pressure and reducing the viscosity are beneficial to increasing the micro oil displacement efficiency. Moreover, these effects can improve the production in the target area and slow down the decline of the formation pressure. Furthermore, in the case of fracture development in the reservoir (due to CO 2 injection before exploitation), the risk of gas channelling, induced by the displacement pressure difference between injection and production wells, is avoided.

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Section: Pore Model Analysismentioning

confidence: 99%

A Comprehensive Study on the Process of Greenhouse Gas Sequestration Based on a Microporous Media Model

Wang¹,

Zhang²,

Zhang³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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“…These two types of residual oil are both in the non-predominant pathway, and water cannot effectively sweep these areas because of specific rock structure. As for isolated oil droplet, the formation process is complicated and not controlled by a single factor, and therefore we have carefully analyzed the formation mechanism in another article [43]. To sum up, rock structure, wettability, and capillary pressure dominate the formation of residual oil.…”

Section: The Residual Oil Distribution Under Different Wetting Conditmentioning

confidence: 99%

“…To sum up, rock structure, wettability, and capillary pressure dominate the formation of residual oil. Zhu et al [43] classified the residual oil as five categories: (1) isolated oil droplet, (2) oil film, (3) residual oil in dead ends, (4) residual oil in pore throats, and (5) cluster residual oil depending on the location and formation process of residual oil. Figure 3 shows the residual oil distribution in the oil-wet porous medium when the water cut is 98%.…”

Section: The Residual Oil Distribution Under Different Wetting Conditmentioning

confidence: 99%

A Pore-Scale Investigation of Residual Oil Distributions and Enhanced Oil Recovery Methods

et al. 2019

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Water flooding is an economic method commonly used in secondary recovery, but a large quantity of crude oil is still trapped in reservoirs after water flooding. A deep understanding of the distribution of residual oil is essential for the subsequent development of water flooding. In this study, a pore-scale model is developed to study the formation process and distribution characteristics of residual oil. The Navier–Stokes equation coupled with a phase field method is employed to describe the flooding process and track the interface of fluids. The results show a significant difference in residual oil distribution at different wetting conditions. The difference is also reflected in the oil recovery and water cut curves. Much more oil is displaced in water-wet porous media than oil-wet porous media after water breakthrough. Furthermore, enhanced oil recovery (EOR) mechanisms of both surfactant and polymer flooding are studied, and the effect of operation times for different EOR methods are analyzed. The surfactant flooding not only improves oil displacement efficiency, but also increases microscale sweep efficiency by reducing the entry pressure of micropores. Polymer weakens the effect of capillary force by increasing the viscous force, which leads to an improvement in sweep efficiency. The injection time of the surfactant has an important impact on the field development due to the formation of predominant pathway, but the EOR effect of polymer flooding does not have a similar correlation with the operation times. Results from this study can provide theoretical guidance for the appropriate design of EOR methods such as the application of surfactant and polymer flooding.

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Numerical Simulation of Gas-Water Two-Phase Microflow Mechanism in Carbonate Gas Reservoir

Zhang

Zhao

et al. 2022

Proceedings of the International Field Exploration and Development Conference 2021

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Pore-scale investigation of residual oil distributions and formation mechanisms at the extra-high water-cut stage

Cited by 22 publications

References 11 publications

A Comprehensive Study on the Process of Greenhouse Gas Sequestration Based on a Microporous Media Model

A Comprehensive Study on the Process of Greenhouse Gas Sequestration Based on a Microporous Media Model

A Pore-Scale Investigation of Residual Oil Distributions and Enhanced Oil Recovery Methods

Numerical Simulation of Gas-Water Two-Phase Microflow Mechanism in Carbonate Gas Reservoir

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