Article
Energy & Fuels
Ranjan Phukan, Rahul Saha
Summary: A low salinity surfactant (LSS) system was developed to enhance the performance of immiscible surfactant alternating gas/CO2 (SAG) flooding in sandstone reservoir cores. LSS solutions showed positive impacts on various mechanisms responsible for enhanced oil recovery (EOR), including reducing surface and interfacial tension, altering wettability, improving CO2-foam stability, and decreasing surfactant adsorption.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Ozan Uzun, Hossein Kazemi
Summary: The traditional waterflooding method is not feasible in shale reservoirs. Osmotic pressure initiated by low-salinity water entering fractures and matrix leads to enhanced oil recovery by counter-current flow of oil from matrix into fractures. Experiments show that using low-salinity water in low-permeability shale cores can improve oil recovery and calculate 'membrane efficiency'.
Article
Energy & Fuels
Tagwa A. Musa, Ahmed F. Ibrahim, Hisham A. Nasr-El-Din, Anas. M. Hassan
Summary: The study confirmed the potential of guar gum as a natural polymer for EOR applications in sandstone reservoirs, showing good stability and viscosity under high-temperature and high-salinity conditions. Additionally, flooding experiments demonstrated a 16% increase in recovery factor.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Review
Energy & Fuels
Athumani Omari Mmbuji, Ruibo Cao, Yang Li, Xingguang Xu, Emmanuel Xwaymay Ricky
Summary: This study highlights the application of polymeric and surfactant nanofluids in improving oil recovery and discusses their performance and influencing factors. The synergistic effects of surfactant, polymer, and nanoparticles on reducing interfacial tension, altering wettability, reducing adsorption, enhancing rheological behavior, and improving nanofluid stability for enhanced oil recovery were presented.
Article
Engineering, Petroleum
Aref Nafisifar, Abbas Khaksar Manshad, Seyed Reza Shadizadeh
Summary: This study has successfully developed a biosurfactant called PECS extracted from cottonseeds. Through various analyses, it has been proven that PECS possesses multiple properties that meet the goals of EOR, including reducing interfacial tension and improving wettability. Additionally, PECS exhibits good emulsion stability and foamability, making it suitable for EOR applications. Coreflooding experiments show a 7.6% increase in recovery factor when using PECS.
Article
Engineering, Chemical
Felipe de O. Apolinario, Adolfo P. Pires
Summary: Low salinity waterflooding involves injecting water with lower salt concentration than the connate water. The pH and the amount of dissolved cations in the water affect cation exchange and residual oil mobilization. This study presents a solution for low salinity slug injection using seawater, considering three dissolved cations and pH effects. The solution shows that pH effects occur near the injection point due to high adsorption rate and creates small regions with salinity changes. The appearance of water and oil banks along the flooding is important for the design of chemical enhanced oil recovery techniques.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Energy & Fuels
Khaled Al-Azani, Sidqi Abu-Khamsin, Muhammad Shahzad Kamal, Shirish Patil, Xianmin Zhou, Syed Muhammad Shakil Hussain, Mohamed Mahmoud
Summary: Surfactants are commonly used in carbonate hydrocarbon reservoirs for enhanced oil recovery. This study focuses on injecting a single component surfactant to mitigate the risk of chromatographic and phase separation. The results show that the single component surfactant alone can achieve high oil recovery without the need for additional cosolvents or cosurfactants, and injecting a polymer can further improve the oil recovery.
Article
Chemistry, Multidisciplinary
Wenzheng Liu, Hong He, Fuqing Yuan, Haocheng Liu, Fangjian Zhao, Huan Liu, Guangjie Luo
Summary: The study investigated the influence of different injection schemes on the enhanced oil recovery (EOR) of heterogeneous phase combination flooding (HPCF) after waterflooding. Results showed that the alternating injection (AI) scheme had the highest EOR, while the simultaneous injection (SI) scheme had the least. Visual flooding experiments also confirmed that the swept area of HPCF under the AI scheme was higher than that of the SI.
Article
Polymer Science
Yaser Ahmadi, Mohamed Arselene Ayari, Meysam Olfati, Seyyed Hossein Hosseini, Amith Khandakar, Behzad Vaferi, Martin Olazar
Summary: This study investigates the effect of green polymeric nanoparticles on the interfacial tension (IFT) and wettability of carbonate reservoirs for enhanced oil recovery (EOR). The performance of xanthan/magnetite/SiO2 nanocomposites and green materials, such as eucalyptus plant nanocomposites and walnut shell nanocomposites, were compared through spontaneous imbibition tests. The results showed that eucalyptus plant nanocomposites performed better than walnut shell nanocomposites in reducing contact angle (CA) and IFT under different salinities. The EOR of carbonate rocks was improved with eucalyptus plant nanocomposites at specific salinity concentrations.
Article
Multidisciplinary Sciences
Mahsa Parhizgar Keradeh, Seyyed Alireza Tabatabaei-Nezhad
Summary: This study investigates the effect of using DTPA as a chelating agent to modify wettability in sandstone and enhance oil recovery. The results show that DTPA concentration of 5 wt% gives the best performance.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Chemical
Jiani Hu, Meilong Fu, Minxuan Li, Honglin He, Baofeng Hou, Lifeng Chen, Wenbo Liu
Summary: SiO2 nanofluid alternating with CO2 injection can be used as an effective substitute for the conventional water alternating gas (WAG) process in oil flooding experiments. The SiO2 nanofluid demonstrates excellent stability and emulsification properties, making it a promising medium for petroleum-related applications. Smaller slug sizes and an optimal slug ratio can delay the breakthrough time and enhance the effectiveness of nanofluid alternate CO2 flooding for enhanced oil recovery (EOR). Additionally, lower permeability rock cores show higher oil recovery rates.
Article
Polymer Science
Hossein Saberi, Ehsan Esmaeilnezhad, Hyoung Jin Choi
Summary: In this study, artificial intelligence techniques were used to evaluate the performance of polymer flooding operation, utilizing multilayer perceptron, radial basis function, and fuzzy neural networks to estimate the output EOR performance, with MLP neural network demonstrating a high ability for prediction. This proposed model can significantly assist engineers in selecting appropriate EOR methods, with API gravity, salinity, permeability, porosity, and salt concentration having the greatest impact on polymer flooding performance.
Article
Polymer Science
Bashirul Haq
Summary: Green enhanced oil recovery (GEOR) is an environmentally friendly technique that improves oil recovery efficiency by injecting specific green fluids to increase residual oil production. Studies have shown that certain green SP formulations can significantly enhance residual oil production in carbonate cores, such as a mixture of APG, XG, and butanone.
Article
Energy & Fuels
Rukuan Chai, Yuetian Liu, Liang Xue, Zhenhua Rui, Ruicheng Zhao, Jingru Wang
Summary: Formation damage is a common phenomenon in the injection of decreased salinity water in sandstone geothermal reservoirs. It is characterized by a decrease in permeability, shrinkage of pore-throat, and enhancement of water-wettability. The damage is mainly caused by fine migration and mineral dissolution, which decrease the connectivity of porous media and impede water flow.
Article
Multidisciplinary Sciences
Yaser Ahmadi, Mohsen Mansouri
Summary: In this study, activated carbon-ZnO nanocomposites (AC/ZnO) were synthesized and tested for their effectiveness in changing wettability, reducing interfacial tension, and improving zeta potential in a sandstone reservoir. The results showed that AC/ZnO performed better than pure ZnO nanoparticles, especially at the optimum concentration of 90 ppm. Further tests also demonstrated that AC/ZnO had a higher oil recovery factor compared to ZnO. This study provides valuable insights into the mechanisms of porous media in the presence of AC/ZnO and pure ZnO.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)