Influencing factors and application prospects of CO2 flooding in heterogeneous glutenite reservoirs

Wang, Jinkai; Zhang, Yuanpei; Xie, Jun

doi:10.1038/s41598-020-58792-z

Cited by 18 publications

(6 citation statements)

References 31 publications

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“…The gas always extracts some components from the oil phase (Boyun et al 2007). Therefore, the efficiency of oil transport by gas can be explained by the concept of MMP (Wang et al 2020). When the gas injection is maintained above the MMP, a high oil recovery factor is achieved (Bisweswar et al 2020).…”

Section: Results Of Comparative Simulation Of the Volumetric Sweep Efficiency During Sg Dag And Tag Injectionsmentioning

confidence: 99%

Optimization of triple-alternating-gas (TAG) injection technique for enhanced oil recovery in tight oil reservoirs

Edouard

Dong

Okere

et al. 2021

J Petrol Explor Prod Technol

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After single-gas (SG) injection operations in tight oil reservoirs, a significant amount of oil is still unrecovered. To increase productivity, several sequencing gas injection techniques have been utilized. Given the scarcity of research on multiple-gas alternating injection schemes, this study propose an optimized triple-alternating-gas (TAG) injection for improved oil recovery. The performance of the TAG process was demonstrated through numerical simulations and comparative analysis. First, a reservoir compositional model is developed to establish the properties and composition of the tight oil reservoir; then, a suitable combination for the SG, double alternating gas (DAG), and TAG was selected via a comparative simulation process. Second, the TAG process was optimized and the best case parameters were derived. Finally, based on the oil recovery factors and sweep efficiencies, a comparative simulation for SG, DAG, and TAG was performed and the mechanisms explained. The following findings were made: (1) The DAG and TAG provided a higher recovery factor than the SG injection and based on recovery factor and economic advantages, CO2 + CH4 + H2S was the best choice for the TAG process. (2) The results of the sensitivity analysis showed that the critical optimization factors for a TAG injection scheme are the injection and the production pressures. (3) After optimization, the recovery factor and sweep efficiency of the TAG injection scheme were the best. This study promotes the understanding of multiple-gas injection enhanced oil recovery (EOR) and serves as a guide to field design of gas EOR techniques.

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Section: Results Of Comparative Simulation Of the Volumetric Sweep Efficiency During Sg Dag And Tag Injectionsmentioning

confidence: 99%

Optimization of triple-alternating-gas (TAG) injection technique for enhanced oil recovery in tight oil reservoirs

Edouard

Dong

Okere

et al. 2021

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

show abstract

“…Global warming and insufficient energy supply have aroused interest in enhanced oil recovery (EOR) with CO 2 and CO 2 capture, utilization and storage (CCUS). − Injection of CO 2 into oil reservoirs known as CO 2 -enhanced oil recovery (EOR) can not only help to store the CO 2 but also improve the recovery of crude oil. − Hence, this process is considered to be the most cost-effective CCUS technique and has been widely used in the development of oilfields. , In CO 2 injection EOR projects, CO 2 diffuses into the formation and helps improve oil recovery by reducing the crude oil viscosity, supplementing the formation energy, swelling oil volume, and reducing the interfacial tension. , Studies have shown that the in situ mass transfer between CO 2 and heavy oil under reservoir conditions is dominated by molecular diffusion and dispersion. , The magnitude of molecular-diffusion coefficients affects the time for the heavy oil to achieve desirable viscosity reduction and swelling effect, thus influencing the oil-production response. , Therefore, the determination of CO 2 diffusion coefficient has extremely important guidance on CO 2 -EOR risk assessment, engineering design, and economic evaluation. , …”

Section: Introductionmentioning

confidence: 99%

“…9,10 In CO 2 injection EOR projects, CO 2 diffuses into the formation and helps improve oil recovery by reducing the crude oil viscosity, supplementing the formation energy, swelling oil volume, and reducing the interfacial tension. 11,12 Studies have shown that the in situ mass transfer between CO 2 and heavy oil under reservoir conditions is dominated by molecular diffusion and dispersion. 13,14 The magnitude of molecular-diffusion coefficients affects the time for the heavy oil to achieve desirable viscosity reduction and swelling effect, thus influencing the oil-production response.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of CO₂ Diffusion in a Multiliquid-Phase System Using Moving Mesh Technology

Chen

Liu

et al. 2023

Energy Fuels

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CO2 diffusion plays an important role in many CO2 injection techniques. But CO2 diffusion in multiliquid-phase systems has not been thoroughly investigated. Here multiliquid-phase system refers to the liquid system coexisting water, light oil, and heavy oil phases. This study investigates the CO2 concentration and the induced oil expansions when CO2 diffuses in a multiliquid-phase system. First, the mathematical model is developed based on the location of the CO2 diffusion front in the multiliquid-phase system. Second, the corresponding numerical model is established for different diffusion stages. To accurately describe the swelling of two oils, we employ the moving mesh technology to monitor the movement of two interfaces. Finally, CO2 concentration profiles, the induced oil swelling, and the movement of the CO2 front are studied by coding the developed numerical model. The results demonstrate that the CO2 concentration distribution and the induced oil swelling exhibit different performances in various phases at different diffusion stages. So it is necessary to divide the diffusion stage when studying the CO2 diffusion in a multiliquid-system. CO2 diffusion results in 19.52% and 17.21% expansion for light and heavy oil, respectively.

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“…Therefore, many newly discovered low-permeability reserves are poorly developed, resulting in a huge potential of remaining reserves in unproduced beach-bar sand reservoirs. For ultra-low permeability beach-bar sand reservoirs, water flooding development is greatly restricted (Li et al, 2020;Mahmud et al, 2020;Wang et al, 2020;Li., 2022;Wang et al, 2022). The development method that relies solely on elastic energy results in rapid decline in production and low recovery of crude oil.…”

Section: Introductionmentioning

confidence: 99%

Application of CO2 miscible flooding in ultra-low permeability beach-bar sand reservoir

Yang

Xu²,

Huang

et al. 2022

Front. Earth Sci.

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The beach-bar sand reservoir of the Sha 4 Member of the Shahejie Formation in the Dongying Sag is the main oil-bearing formation in this area. In recent years, its proven reserves have been getting lower and lower, and the poor petrophysical properties of the reservoir have made water injection development difficult. In turn, it results in a rapid decline in elastic development productivity and low oil recovery. In this study, the experimental evaluation and numerical simulation research on the adaptability of CO2 flooding in beach-bar sand reservoirs are carried out on the basis of fully investigating the successful examples of CO2 flooding conducted by the previous. According to the geological characteristics of the reservoir in the CL area of the Dongying Sag, the reasonable reservoir engineering parameters and surface injection procedures for the CO2 flooding have been formulated. Experiments show that after the completion of water flooding, the recovery factor of the CO2 continuous flooding is 85.64%. It proves that the recovery factor of the CO2 flooding is higher than that of the water flooding. Field tests have shown that CO2 molecules in beach-bar sand reservoirs behave in a supercritical state underground, which is easier to being injected into the reservoir than water. In addition, the displacement distance of the CO2 is obviously larger than that of the water injection development. The gas-oil ratio variation of different flooding types is different, and CO2 flooding can effectively increase the formation energy, and improve the oil recovery and economic benefits of this type of reservoir.

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Influencing factors and application prospects of CO2 flooding in heterogeneous glutenite reservoirs

Abstract: horizontal wellbore. With the continuous increase in gas injection, the lower part of the reservoir is gradually displaced, and the final sweep efficiency of gas can exceed 80%.

Cited by 18 publications

References 31 publications

Optimization of triple-alternating-gas (TAG) injection technique for enhanced oil recovery in tight oil reservoirs

Optimization of triple-alternating-gas (TAG) injection technique for enhanced oil recovery in tight oil reservoirs

Numerical Simulation of CO₂ Diffusion in a Multiliquid-Phase System Using Moving Mesh Technology

Application of CO2 miscible flooding in ultra-low permeability beach-bar sand reservoir

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Influencing factors and application prospects of CO2 flooding in heterogeneous glutenite reservoirs

Abstract: horizontal wellbore. With the continuous increase in gas injection, the lower part of the reservoir is gradually displaced, and the final sweep efficiency of gas can exceed 80%.

Cited by 18 publications

References 31 publications

Optimization of triple-alternating-gas (TAG) injection technique for enhanced oil recovery in tight oil reservoirs

Optimization of triple-alternating-gas (TAG) injection technique for enhanced oil recovery in tight oil reservoirs

Numerical Simulation of CO2 Diffusion in a Multiliquid-Phase System Using Moving Mesh Technology

Application of CO2 miscible flooding in ultra-low permeability beach-bar sand reservoir

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Numerical Simulation of CO₂ Diffusion in a Multiliquid-Phase System Using Moving Mesh Technology