Visualized Experiments on Residual Oil Classification and Its Influencing Factors in Waterflooding Using Micro-Computed Tomography

Song, Rui; Peng, Jinrong; Sun, Shuyu; Wang, Yao; Cui, Mengmeng; Li, Jianjun

doi:10.1115/1.4045926

Cited by 24 publications

(49 citation statements)

References 45 publications

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“…To study the oil displacement method for enhancing oil recovery after polymer flooding, researchers have used high-concentration polymers to increase the viscosity of the solution, or added alkali and surfactant on the basis of the polymer to form a ternary composite flooding system [ 22 , 23 , 24 , 25 , 26 ]. The oil-water interfacial tension improves the oil displacement efficiency [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Micro Production Mechanism of Corner Residual Oil after Polymer Flooding

et al. 2022

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To study the microscopic production mechanism of corner residual oil after polymer flooding, microscopic visualization oil displacement technology and COMSOL finite element numerical simulation methods were used. The influence of the viscosity and interfacial tension of the oil displacement system after polymer flooding on the movement mechanism of the corner residual oil was studied. The results show that by increasing the viscosity of the polymer, a portion of the microscopic remaining oil in the corner of the oil-wet property can be moved whereas that in the corner of the water-wet property cannot be moved at all. To move the microscopic remaining oil in the corners with water-wet properties after polymer flooding, the viscosity of the displacement fluid or the displacement speed must be increased by 100–1000 times. Decreasing the interfacial tension of the oil displacement system changed the wettability of the corner residual oil, thus increasing the wetting angle. When the interfacial tension level reached 10−2 mN/m, the degree of movement of the remaining oil in the corner reached a maximum. If the interfacial tension is reduced, the degree of production of the residual oil in the corner does not change significantly. The microscopic production mechanism of the corner residual oil after polymer flooding expands the scope of the displacement streamlines in the corner.

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Section: Introductionmentioning

confidence: 99%

Study on Micro Production Mechanism of Corner Residual Oil after Polymer Flooding

et al. 2022

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“…Moreover, the same researchers explained a workflow for creating accurate 3D printed core samples using a machine-learning image processing approach based on the CT data [46]. The porescale waterflooding experiments were also carried out on mixed-wetted natural sandstone along with a 3D printed prototype using lCT data [47]. The authors investigated wettability and pore geometry effects on the morphology of the residual oil block.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of 3D printed microfluidic networks to study fluid flow in rocks

Mousavi

Sadeghnejad

Ostadhassan

2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Visualizing fluid flow in porous media can provide a better understanding of transport phenomena at the pore scale. In this regard, transparent micromodels are suitable tools to investigate fluid flow in porous media. However, using glass as the primary material makes them inappropriate for predicting the natural behavior of rocks. Moreover, constructing these micromodels is time-consuming via conventional methods. Thus, an alternative approach can be to employ 3D printing technology to fabricate representative porous media. This study investigates fluid flow processes through a transparent microfluidic device based on a complex porous geometry (natural rock) using digital-light processing printing technology. Unlike previous studies, this one has focused on manufacturing repeatability. This micromodel, like a custom-built transparent cell, is capable of modeling single and multiphase transport phenomena. First, the tomographic data of a carbonate rock sample is segmented and 3D printed by a digital-light processing printer. Two miscible and immiscible tracer injection experiments are performed on the printed microfluidic media, while the experiments are verified with the same boundary conditions using a CFD simulator. The comparison of the results is based on Structural Similarity Index Measure (SSIM), where in both miscible and immiscible experiments, more than 80% SSIM is achieved. This confirms the reliability of printing methodology for manufacturing reusable microfluidic models as a promising and reliable tool for visual investigation of fluid flow in porous media. Ultimately, this study presents a novel comprehensive framework for manufacturing 2.5D realistic microfluidic devices (micromodels) from pore-scale rock images that are validated through CFD simulations.

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“…Second, chemical solvents such as acids can chemically react with substances in the matrix causing severe damage to the core. Nevertheless, with the development of digital cores [1,24,25], laser etching and 3D printing technology [26] were commonly used in core reconstruction [27,28]. e advantage is that we can reconstruct the fracture network inside the core so that it can more accurately represent the fracture structure of the actual core.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Artificial Core Reconstruction of a Fracture‐Control Matrix Unit

Liu

Pei

et al. 2020

Advances in Civil Engineering

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The fracture-control matrix unit (F-CMU) is a special body present in low-permeability fractured reservoirs that can be distinguished by a fracture system and a matrix system. The imbibition phenomenon of the F-CMU provides the possibility for secondary development of low-permeability fractured reservoirs because of the driving force including capillary force and gravity. However, the F-CMU is difficult to obtain during the field core drilling, which has limited the development for laboratory dynamic imbibition tests. Therefore, a new F-CMU reconstruction method is proposed in this study. According to the geometry and parameters, combining laser engraving technology, the fracture system is designed and engraved. Then, the F-CMU is established using a three-dimensional (3D) printed material called polyvinyl alcohol (PVA) as fracture support material which has a faster dissolution rate and causes less damage to the core due to water being the solvent. Finally, the porosity, permeability, and wettability of the matrix system and the T2 spectra from nuclear magnetic resonance (NMR) before and after reconstruction are measured. In addition, numerical simulation calculation of F-CMU permeability is performed. The results show that the characteristic parameters of the matrix system hardly change, indicating low damage to the core. The reconstructed fracture system is found on the T2 spectra, and the fracture permeability is consistent by comparing with the experimental and numerical simulation results. The permeability of the fracture system is about 104 orders of magnitude of the matrix system, which is closer to real core and meets the requirements needed for dynamic permeability experiments.

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Visualized Experiments on Residual Oil Classification and Its Influencing Factors in Waterflooding Using Micro-Computed Tomography

Cited by 24 publications

References 45 publications

Study on Micro Production Mechanism of Corner Residual Oil after Polymer Flooding

Study on Micro Production Mechanism of Corner Residual Oil after Polymer Flooding

Evaluation of 3D printed microfluidic networks to study fluid flow in rocks

A New Method for Artificial Core Reconstruction of a Fracture‐Control Matrix Unit

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