Remaining oil distribution in models with different heterogeneities after CO2 WAG injection: Visual research by nuclear magnetic resonance technique

Wang, Yefei; Li, Zongyang; Zhang, Shiming; Liu, Dexin

doi:10.1007/s11771-021-4712-z

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…Ma et al [30], and Wang et al [31] investigated the changes in oil saturation due to reservoir pore size and the hydrodynamic radius of the chemical constituents in the injected fluid using fluid flow simulation experiments. We can obtain residual oil distribution and quantification data on the nanomicro pore level using industrial computed tomography (CT) scanning reconstruction technology [32,33] and nuclear magnetic resonance technology [34]. Fannir et al [35] studied the experimental research on two-phase flow displacement using Magnetic Resonance Imaging (MRI) techniques and investided the process of the phase trapping, the front deformation and the phases saturation propagation along a vertical model during (water-oil) two-phase flow.…”

Section: Nomenclaturementioning

confidence: 99%

Experimental Research on the Millimeter-Scale Distribution of Oil in Heterogeneous Reservoirs

Yu¹

2023

Fluid Dynamics &Amp; Materials Processing

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Oil saturation is a critical parameter when designing oil field development plans. This study focuses on the change of oil saturation during water flooding. Particularly, a meter-level artificial model is used to conduct relevant experiments on the basis of similarity principles and taking into account the layer geological characteristics of the reservoir. The displacement experiment's total recovery rate is 41.35%. The changes in the remaining oil saturation at a millimeter-scale are examined using medical spiral computer tomography principles. In all experimental stages, regions exists where the oil saturation decline is more than 10.0%. The shrinkage percentage is 20.70% in the horizontal well production stage. The oil saturation reduction in other parts is less than 10.0%, and there are regions where the oil saturation increases in the conventional water flooding stage.

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Section: Nomenclaturementioning

confidence: 99%

Experimental Research on the Millimeter-Scale Distribution of Oil in Heterogeneous Reservoirs

Yu¹

2023

Fluid Dynamics &Amp; Materials Processing

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“…To address CO 2 gas breakthrough, a novel displacement technique, the WAG method, has been introduced [13,14]. WAG flooding utilizes water pressure to drive CO 2 further into the reservoir, improving CO 2 injection efficiency and crude oil recovery [15]. The use of water to control fluidity and stabilize the displacement front enhances injection sweep efficiency.…”

Section: Introductionmentioning

confidence: 99%

Research on the Timing of WAG Intervention in Low Permeability Reservoir CO2 Flooding Process to Improve CO2 Performance and Enhance Recovery

Zhao,

Sang,

Ding

et al. 2023

Energies

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In low permeability reservoirs, CO2 flooding usually leads to gas channeling, whereby a significant amount of CO2 bypasses the oil-bearing formation and fails to effectively displace oil. Introducing water-alternating-gas (WAG) flooding, utilizing water phase stability-driven processes, serves to suppress gas channeling and enhance oil recovery rates. Implementing WAG flooding, which utilizes water phase stability-driven processes, helps suppress gas channeling and improve oil recovery rates. The timing of implementing WAG flooding is crucial. Initiating WAG flooding prematurely can limit the efficiency of CO2 displacement, while initiating it with delays may result in severe gas channeling, resulting in decreased production and increased environmental risks. Finding the balance point is the challenge. The balance point can effectively control gas channeling without reducing the efficiency of CO2 flooding. In this paper, the timing of WAG flooding in low permeability reservoirs is studied in detail. Firstly, this study conducted experimental research to investigate the CO2 displacement process in both homogeneous and heterogeneous cores. Furthermore, it validated the correlation between the timing of WAG injection and the heterogeneity of the cores. The experimental results indicated the existence of an optimal timing for WAG injection, which is correlated with the degree of heterogeneity. Numerical simulation studies were performed to simulate the characteristics of the light oil–CO2 system using the Peng–Robinson (PR) equation. Furthermore, a history matching analysis was performed to validate the experimental results and investigate the correlation between WAG injection and the degree of heterogeneity. The study concluded that as the degree of heterogeneity increases, initiating WAG injection earlier leads to a more significant suppression of gas channeling, increased water–gas interaction, improved gas–oil contact, and enhanced the synergistic effect of increasing the resistance and pressure of WAG flooding and controlling gas channeling. This finding has significant practical implications, as the optimization of WAG injection timing can enhance oilfield production efficiency.

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Evaluation of Development Effect for CO2 Flooding After Water Flooding in Low Permeability Reservoirs-A Case Study of a Well Group in Hei46 Block, Jilin Oilfield

He,

Ji,

Wang

et al. 2024

Springer Series in Geomechanics and Geoengineering

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Remaining oil distribution in models with different heterogeneities after CO2 WAG injection: Visual research by nuclear magnetic resonance technique

Cited by 7 publications

References 35 publications

Experimental Research on the Millimeter-Scale Distribution of Oil in Heterogeneous Reservoirs

Experimental Research on the Millimeter-Scale Distribution of Oil in Heterogeneous Reservoirs

Research on the Timing of WAG Intervention in Low Permeability Reservoir CO2 Flooding Process to Improve CO2 Performance and Enhance Recovery

Evaluation of Development Effect for CO2 Flooding After Water Flooding in Low Permeability Reservoirs-A Case Study of a Well Group in Hei46 Block, Jilin Oilfield

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