Article
Energy & Fuels
Mohammed Abdalla Ayoub, Bennet Nii Tackie-Otoo, Siti Hidmayati Binti Zulkefli
Summary: This study investigates the minimum miscibility pressure (MMP) of carbon dioxide (CO2) flooding using a simulation approach and compares different correlations for determining MMP. The impact of MMP and injection rate on oil recovery by CO2 flooding is evaluated using a synthetic reservoir model. The results show that miscible flooding is more effective in improving oil recovery, but immiscible CO2 flooding is a feasible option.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Energy & Fuels
Nurafiqah Abdullah, Nurul Hasan
Summary: This study investigates the effects of miscible CO2 injection on production recovery in the Cornea Field and validates the model. It is found that increasing reservoir pressure, temperature, and CO2 injection rate can enhance oil production. The research aims to fill the knowledge gap in the Cornea Field regarding the effectiveness of CO2 injection.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Xiaofang Li, Ping Wang, Sen Wang, Qihong Feng, Qingzhong Xue
Summary: Through molecular dynamics simulations, the miscible behavior between hydrocarbon gas and crude oil in nanoslits was investigated, revealing that longer chain length of hydrocarbon gas enhances miscibility with crude oil, while increasing polarity of crude oil reduces miscibility with hydrocarbon gas.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Mohamed Almobarak, Susan Holmes, Colin D. Wood, Matthew B. Myers, Ali Saeedi, Quan Xie
Summary: This study investigates the potential of chemical-assisted MMP reduction for expanding the application of miscible natural gas injection, with results showing that chemicals with 2-oxopyrrolidine and aromatic sulfonic acid functional groups exhibit higher MMP reductions. Increasing the hydrocarbon chain length may decrease the efficiency in reducing MMP, highlighting the importance of optimizing functional groups and hydrocarbon chain length in potential chemicals for MMP reduction.
Article
Geochemistry & Geophysics
Dangke Ge, Haiying Cheng, Mingjun Cai, Yang Zhang, Peng Dong
Summary: Gas injection processes, specifically miscible and/or near miscible gas injection, are effective methods for enhanced oil recovery. Accurate determination of minimum miscibility pressure is crucial for the successful design and implementation of a miscible gas injection project. The new model proposed in this paper considers the influence of multiple-contact, making it more practical and accurate for predicting CO2-oil MMP compared to traditional methods.
Article
Energy & Fuels
Dru J. Heagle, David Ryan
Summary: Gas injection in oil reservoirs can enhance oil recovery, but its impact on oil properties must be evaluated. This study investigated the changes in oil properties when equilibrated with various gases including CO2, CO2-SO2, methane, ethane, and propane. The results demonstrated that CO2-SO2 may be more beneficial for miscible gas injection compared to pure CO2. Additionally, methane did not cause oil swelling, while ethane and propane induced oil swelling.
Article
Energy & Fuels
Zlata Grenoble, Siwar Trabelsi
Summary: The study explored the effect of two different model microemulsion systems on interfacial tensions at high-temperature and high-pressure conditions at the nitrogen-brine interface. The results showed substantial reduction in interfacial tensions and maintained stability and performance under high-temperature and high-pressure conditions.
Article
Chemistry, Multidisciplinary
Yu Zhang, Ke Zhang, Ao Li, Changyu Sun
Summary: This study focuses on the natural gas miscible flooding phenomenon in low permeability reservoirs. By conducting laboratory experiments and establishing a compositional model, the phase behavior of the miscible zone was analyzed. The research findings showed that the fluid critical points of the miscible zone change polynomially in the P-T diagram, with a larger area at higher pressures. Furthermore, a new method for gas channeling identification was proposed. This study has significant theoretical implications for timely prevention and control of gas channeling and improving the effectiveness of gas injection development.
Article
Chemistry, Physical
Binfei Li, Lei Zheng, Aiqing Cao, Hao Bai, Chuanbao Zhang, Zhaomin Li
Summary: In this paper, the process of CO2 dissolution and crude oil expansion during CO2 flooding was investigated using a high temperature and high pressure visual reactor. The results showed that as the pressure increased, more CO2 was dissolved into the crude oil, causing the volume of the oil to expand. The interface characteristics between CO2 and crude oil were found to be closely related to the phase interaction between them, and were affected by both pressure and temperature.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Medicine, General & Internal
Do-Young Park, Soon-Cheol Cha
Summary: The purpose of this study was to investigate factors associated with an increase in neuroretinal rim (NRR) thickness measured based on Bruch's membrane opening-minimum rim width (BMO-MRW) after trabeculectomy in patients with primary open-angle glaucoma. The results showed that NRR thickness measured based on BMO-MRW increased with decreasing intraocular pressure post-trabeculectomy, with younger patients and greater IOP reduction associated with the increase in BMO-MRW. Biomechanically, the NRR seems to comprise cells and substances sensitive to changes in IOP and age.
JOURNAL OF CLINICAL MEDICINE
(2021)
Article
Engineering, Chemical
Yishan Liu, Xiaohu Dong, Zhangxin Chen, Yanan Hou, Qilan Luo, Shanshan Chen
Summary: The study combined core displacement tests and digital cores to investigate the pore-scale movability of tight oil, finding that remaining tight oil can be classified into block-like, flat-like, and film-like categories. Different displacement methods, such as water flooding, CH4 flooding, and CO2 flooding, were used to unlock these types of oil, with CO2 flooding proving more effective at unlocking film-like oil compared to CH4 flooding.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Geochemistry & Geophysics
Xiangwen Kong, Hongjun Wang, Wei Yu, Ping Wang, Li Liu, Wenjing Zhang
Summary: This paper studies the phase behavior of volatile oil from Duvernay shale and analyzes the impact of nanopore confinement on the oil. The minimum miscibility pressure for different injected gases is calculated, and it is suggested to use wellhead rich gas as the main gas source for injection.
Article
Energy & Fuels
Bingguan Liu, Zhilin Wang, Yong Jin, Zhengjun Ge, Chenghao Xu, Haipeng Liu, Hao Chen
Summary: CO2-enhanced oil recovery (EOR) is an important method in the third stage of oil recovery and plays a significant role in carbon capture, utilization, and storage (CCUS). Miscible displacement is more effective than immiscible displacement in CO2-EOR, and accurate minimum miscible pressure (MMP) prediction is crucial for reservoir development planning. Traditional methods are time-consuming and empirical formulas have limited accuracy. This study utilized a stacking approach to improve MMP prediction through filtering and fusing multiple machine learning models. The results demonstrate the improvement of the stacking model in terms of mean absolute error (MAE), root-mean-square error (RMSE), and decision coefficient (R2).
Article
Engineering, Environmental
Wei Lv, Mingzhe Dong, Hemanta Sarma, Yajun Li, Zijin Li, Junteng Sun, Houjian Gong
Summary: This study investigated the effects of nonionic polyether surfactants on improving the miscibility of CO2-hydrocarbon systems through experiments and molecular dynamics simulations. The results showed that adding polyethers with different structures could reduce the miscibility pressure between CO2 and hydrocarbons. The capability of polyethers to improve oil-gas miscibility depended on the polyoxypropylene chain length and alkyl chain length. The molecular dynamics simulations revealed the mechanism of how polyethers enhanced the oil-gas miscibility.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Sun Youzhuang, Zhang Junhua, Zhang Yongan
Summary: In oil exploration and development, porosity is a crucial parameter for reservoir description. Traditional methods for obtaining porosity through indoor experiments require significant resources. This study introduces the Gray Wolf Optimization algorithm to optimize porosity prediction using the ESN network. The improved algorithm shows superior performance in parameter adjustment, and the IGWO-ESN neural network outperforms other machine learning models in terms of porosity prediction accuracy.