Article
Energy & Fuels
Zhihao Jiang, Gaoren Li, Peiqiang Zhao, You Zhou, Zhiqiang Mao, Zhidi Liu
Summary: Wettability is crucial for understanding the seepage characteristics of tight sandstone reservoirs. This study investigates the spontaneous imbibition and displacement behaviors of mixed-wet tight sandstone reservoirs using high precision balance and nuclear magnetic resonance (NMR) T2 experiment. The results reveal different types of pores with different wettability and provide a novel wettability evaluation method for mixed-wet tight sandstone.
Article
Mechanics
Jun Zheng, Hongbo Liu, Ning Liu, Yihang Xiao
Summary: A new general pore-network capillary pressure model for fractional-wet media is proposed in this study, successfully simulating capillary pressure curves and revealing multiphase flow mechanisms. The model performs well in predicting experimental data validation with different wettability conditions.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Energy & Fuels
A. Posenato Garcia, Z. Heidari
Summary: The dominant wettability of reservoir rocks affects the spatial distribution of fluids inside the pore space and controls the establishment of an electric double layer at the solid-liquid interface, influencing the conductivity and permittivity of the rock. An analytical model introduced in this paper characterizes the dielectric permittivity dispersion of mixed-wet sedimentary rocks, providing a novel interpretation method for the influence of wettability on complex permittivity. Experimental measurements verified the reliability of the model and its physical interpretation of wettability's influence on the complex dielectric permittivity of rocks.
SPE RESERVOIR EVALUATION & ENGINEERING
(2021)
Article
Energy & Fuels
Emilia V. Silletta, Gerardo Martinez Delfa, Manuel I. Velasco, Jorge A. Donadelli, Gustavo A. Monti, Clara Smal, Rodolfo H. Acosta
Summary: This article discusses the importance of typifying and quantifying organic matter and fluids in shale rocks for the characterization and evaluation of unconventional oil reservoirs. The use of high field H-1 nuclear magnetic resonance is introduced as a fast and reliable technique with minimal sample requirements. A modified sequence is proposed to improve the accuracy of data extrapolation for T-2 determination. The study also examines the evaporation kinetics of heptane in shale mudstones and identifies a critical level at which a transition from a funicular to a pendular regime occurs.
Article
Engineering, Geological
Song Jiang, Ming Huang, Yujing Jiang, Chaoshui Xu, Binglei Li
Summary: The study investigated the deterioration characteristics of gypsiferous rocks under repeated wetting and drying actions, revealing visible cracks and enhanced dissolution of the rocks. The internal pore structure and particles detachment were found to be affected by the combined actions of W-D processes and water flow, leading to uneven reduction in specimen diameter. The feasibility of using pore structure parameters to characterize mechanical property deterioration of gypsiferous rocks under different water flow rates was demonstrated based on the proposed deterioration model.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Shuangmei Zou, Peixing Xu, Congjiao Xie, Xuan Deng, Haodong Tang
Summary: High resolution micro-computed tomography images are used to study the mechanism of fluid flow in porous media. Fractal dimension, lacunarity, and succolarity are used to quantify the complexity, clustering, and flow capacity of water and oil phases. The results show that wettability alteration affects the fractal dimension, lacunarity, and succolarity of the phases. This study provides insights into the influence of phase geometry on relative permeability and phase fractal changes during multiphase flow.
Article
Energy & Fuels
Can Liang, Lizhi Xiao, Zijian Jia, Long Guo, Sihui Luo, Zhengyi Wang
Summary: Rock wettability significantly affects fluid distributions in reservoirs and enhanced oil recovery. This study constructs a new pore-scale mixed-wet rock model considering the contact angle and wetting area, investigating the T2 responses and NMR T2-based wettability indices. The results show that wetting area ratio, actual contact angle, and fluid saturation significantly impact T2 distributions of fluid-saturated mixed-wet rocks.
Article
Energy & Fuels
Can Liang, Lizhi Xiao, Zijian Jia, Long Guo, Sihui Luo, Zhengyi Wang
Summary: Rock wettability is important for reservoirs and enhanced oil recovery. This study constructs a new mixed-wet rock model that considers contact angle and wetting area. The results show that current NMR wettability indices are not suitable for weakly wet or intermediate-wet rocks, and provide a theoretical basis for interpreting NMR T2 characterizations in rocks with mixed wettability.
Article
Chemistry, Physical
Vahideh Mirchi, Morteza Dejam, Vladimir Alvarado
Summary: In this study, the interfacial tensions (IFTs) and contact angles of brine/hydrogen-methane (H-2-CH4) mixtures were measured and the effects of temperature and mixture fraction on these properties were investigated. The results showed that H-2-CH4 mixtures exhibited weakly water-wet behavior on oil-wet rock surfaces, and the IFT was influenced by temperature and methane fraction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Polymer Science
Agatha Densy dos Santos Francisco, Daniel Grasseschi, Regina Sandra Veiga Nascimento
Summary: The study synthesized TMC and TMC-C14 and evaluated their performance in altering rock wettability and promoting oil displacement through a series of experiments. The results showed that TMC performed better in changing wettability and promoting oil displacement.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Engineering, Civil
Guanglei Zhang, Mohamed Regaieg, Martin J. Blunt, Branko Bijeljic
Summary: A porous plate technique was developed to measure capillary pressure in carbonate rock samples. The study showed that in mixed-wet media, displacement of oil from micro-porosity can occur at much lower capillary pressures than previously estimated.
JOURNAL OF HYDROLOGY
(2023)
Article
Physics, Fluids & Plasmas
Ashkan Irannezhad, Bauyrzhan K. Primkulov, Ruben Juanes, Benzhong Zhao
Summary: Wettability plays a fundamental role in controlling multiphase flow in porous media, and its influence has been extensively studied in uniform-wet porous media. However, the understanding of multiphase flow in porous media with heterogeneous wettability, known as mixed-wet media, is limited. In this study, we investigate the displacement of silicone oil by water in mostly oil-wet porous media patterned with discrete water-wet clusters. Surprisingly, the displacement pattern depends on the wettability alteration, where water preferentially fills strongly water-wet clusters and encircles weakly water-wet clusters, resulting in significant oil trapping. Pore-scale simulations provide insights into this counterintuitive observation by revealing the S-shaped saddle-like fluid-fluid interfaces at mixed-wet pores.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Energy & Fuels
Yajun Gao, Xiaoqing Xie, Shoulei Wang, Lihui Tang, Zhanli Geng, Junjian Li
Summary: In this study, constant injection rate core-flooding experiments were conducted on sandstone samples with different wettability. The impacts of wettability on pore-scale fluid distribution and remaining oil formation process were investigated. The results showed that wettability significantly influences the distribution and recovery of oil.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Hamid Daneshmand, Masoud Rezaeinasab, Masoud Asgary, Meysam Karimi
Summary: Wettability alteration from oil-wet to water-wet on rock surfaces is important for Enhanced Oil Recovery (EOR), where nanoparticles, especially polymer-grafted nanoparticles, show promising results in improving oil recovery. The challenges in applying nanoparticles for EOR lie in the colloidal stability of nanofluids in harsh reservoir conditions. Modified silica nanoparticles with hydrophobic agent trimethoxy (propyl) silane and mixed polyethylene glycol methyl ether have shown effective retention and wettability alteration properties, particularly in oil-wet substrates due to hydrophobic interaction.
Article
Energy & Fuels
Ahmed Al-Yaseri, Ghazanfer Raza Abbasi, Nurudeen Yekeen, Fssiz Al-Shajalee, Ausama Giwelli, Quan Xie
Summary: The study revealed that cleaning agents can alter the wettability of rocks, with toluene recommended for water-wet rock and acetone for oil-wet rock. Heptane is suitable for modifying wettability of oil-wet cores. Air plasma is the only effective method for removing surface contamination and organic carbon from quartz substrates to avoid incorrect contact angle measurements.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)