Article
Energy & Fuels
Jitendra S. Sangwai, Siddhant Kumar Prasad
Summary: Investigating the effects of surfactant concentration and droplet size distribution on the rheology of water-in-oil emulsion systems is important for understanding the antiagglomeration properties and finding suitable strategies for flow assurance issues. This study focuses on the rheological characterization of hydrate slurries with a mixed surfactant system and demonstrates that the presence of surfactants can increase the viscosity of the slurries up to a certain concentration, but higher concentrations can reduce viscosity and act as antiagglomerants.
Article
Energy & Fuels
Yuchuan Chen, Bohui Shi, Shunkang Fu, Qingping Li, Haiyuan Yao, Yang Liu, Xiaofang Lv, Junao Wang, Qingyun Liao, Xu Duan, Jing Gong
Summary: This study investigated the impact of wax crystals on hydrate formation and rheological properties of hydrate slurry through rheological experiments, revealing that both wax content and water cut affect the formation and growth of hydrates. Semi-empirical models were proposed to describe the inhibitory effect of wax crystals on hydrate nucleation kinetics. The study also found that the maximum values of hydrate slurry viscosity rate and calculated hydrate effective volume fraction decreased with increasing wax content, and hydrate growth time was extended with higher wax content.
Article
Energy & Fuels
Jiaqiang Jing, Lequan Zhuang, Rinat Karimov, Jie Sun, Xingtang Zhang, Hang Yang
Summary: There are multiple flow assurance challenges in deep-water energy development, with the coexistence of wax and hydrate posing one of the most difficult problems. An experimental study was conducted to investigate the impact of wax content, water cut, subcooling, and static time on CP hydrate-forming mixtures. The results revealed that wax inhibits hydrate nucleation and growth, but the viscosity of hydrate slurry is still higher in systems with wax due to wax-hydrate aggregates contributing to system viscosity. Additionally, wax increases the yield stress of the hydrate slurry, with a more significant effect at higher water cut and longer static times. The rating: 9/10.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Engineering, Chemical
Fanny Thomas, Didier Dalmazzone, Jeffrey F. Morris
Summary: The wetting characteristics of ice-like clathrate hydrates at atmospheric pressure were studied using a new experimental method to measure the contact angle of various liquids. The results showed that the hydrate surface is water-wetting.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Thermodynamics
Nada Chami, Yasmine Salehy, Dennis Burgner, Pascal Clain, Didier Dalmazzone, Anthony Delahaye, Laurence Fournaison
Summary: The use of CO2 hydrates as phase change materials in secondary loop refrigeration is promising. This study found that the formation pressure of hydrates can be significantly lowered by using promoters. The rheological properties of CP and mixed CP + CO2 hydrate slurries were studied, and they exhibited a shear thinning behavior.
Article
Engineering, Chemical
Jiaqiang Jing, Lequan Zhuang, Rinat Karimov, Jie Sun, Xingtang Zhang
Summary: In the later stage of oilfield development, the increased free water in the pipeline can lead to phase inversion of water-in-oil emulsions, which increases the risk of hydrate plugging. An experimental study was conducted to examine the effects of wax content, water cut, temperature, initial pressure, and rotation speed on hydrate nucleation and slurry viscosity. The presence of wax hinders the nucleation and growth of hydrates, but also affects the viscosity of the hydrate slurry.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Energy & Fuels
Jia Liu, Jing Wang, Ti Dong, Deqing Liang
Summary: The formation of wax crystals and hydrates in deep-sea crude oil can affect the nucleation, growth, aggregation, and crystal structure of hydrates. Specifically, wax crystals inhibit hydrate formation, while hydrate formation reduces wax crystal aggregation, improving the flow characteristics of the hydrate slurry. Wax has no effect on the crystal structure of CH4 hydrate but impacts the distribution of the gas in cavities.
Article
Engineering, Chemical
Xiaofang Lv, Boyu Bai, Yi Zhao, Yang Liu, Qianli Ma, Chuanshuo Wang, Shidong Zhou, Shangfei Song, Bohui Shi
Summary: This paper focuses on the effects of water cut, polymerization inhibitor concentration, and temperature on the viscosity of natural gas hydrate slurry. It establishes a rheological model for the slurry and finds that water cut and polymerization inhibitor concentration increase the apparent viscosity, while temperature decreases it.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Energy & Fuels
Jian Zhao, Xiao-Feng Li, Hang Dong, Zhi-Hua Wang
Summary: An improved rheo-optic in situ synchronous measurement system was used to investigate the gelation behavior and mechanism of waxy crude oil emulsions. The microscopic mechanism and evolution of the microstructure during gelation process were obtained by combining transmitted natural light and reflected polarized light microscopy. The aggregation of emulsified water droplets was found to be significant and contributes to the formation and development of the wax crystals-emulsified water droplets coaggregate, leading to the evolution of the gelled microstructure. The correlation between viscoelasticity and microstructure evolution of waxy crude oil emulsions with different water contents was also discussed.
Article
Energy & Fuels
Hongju Chen, Shunkang Fu, Shuai Chai, Qingyun Liao, Bohui Shi, Jing Gong
Summary: This study established a viscosity model of hydrate slurry based on experiments, incorporating wax content into flow properties and proposing risk management methods to control hydrate blockage. The results indicate the feasibility of this method in deep-water fields with high wax content reservoirs.
Article
Engineering, Chemical
Dongxu Zhang, Qiyu Huang, Rongbin Li, Wei Wang, Xiangrui Zhu, Huiyuan Li, Yijie Wang
Summary: The presence of waxes strengthened the inhibiting effect of asphaltenes on hydrate formation in asphaltene-containing water-in-oil emulsions. Wax crystals dispersed in the bulk phase and got adsorbed at water-oil interface through the synergistic effect with asphaltenes, inhibiting the dissociation of hydrates.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Yijie Wang, Qiyu Huang, Dongxu Zhang, Kun Wang, Xun Zhang, Yu Zhang, Zhenkang Xu, WenChen Liu
Summary: This study investigates the influence of asphaltenes on the evolution behavior of CO2 hydrates in waxy water-in-oil emulsions using a lab scale high-pressure stirring reactor. The results show that waxes inhibit CO2 hydrate nucleation, while the addition of asphaltenes enhances this inhibition effect. Moreover, asphaltenes facilitate the decomposition process of CO2 hydrates in waxy systems.
Article
Energy & Fuels
Wang Weiyang, Zhou Chenru, Liu Chenwei, Wang Zhiyuan, Li Mingzhong
Summary: This study investigated the interaction behaviors of hydrate particle-particle/droplet and hydrate deposition-pipe wall in the cyclopentane (CyC5) vapor phase. The results showed that hydrate formation rate is higher in the vapor phase compared to the liquid CyC5 phase. The hydrate particle-particle adhesion forces slightly increase with temperature in the vapor phase, and the hydrate-droplet adhesion forces change with the conversion of water in liquid bridges. The adhesion strengths of hydrate deposition increase with substrate roughness and formation/annealing time, but decrease with temperature.
Article
Energy & Fuels
Wang Weiyang, Zhou Chenru, Liu Chenwei, Wang Zhiyuan, Li Mingzhong
Summary: This study experimentally investigated the interaction behaviors of hydrate particle-particle/droplet and hydrate deposition-pipe wall in the cyclopentane vapor phase. It found that hydrate formation in the vapor phase is a fast-growing process with rough particle surfaces exhibiting strong hydrophilic characteristics. The adhesion forces between hydrate particles in the vapor phase slightly increase with temperature and are approximately 2-3 times higher than in the liquid cyclopentane phase. In the case of hydrate deposition, the adhesion strengths increase with substrate roughness and formation/annealing time, but decrease with temperature.
Article
Energy & Fuels
Shikun Tong, Pengfei Li, Fengjun Lv, Zhiyuan Wang, Weiqi Fu, Jianbo Zhang, Litao Chen, Xuerui Wang
Summary: This study investigates the impact of wax on hydrate formation and dissociation in water-in-oil emulsions. Experimental results show that wax forms a shell barrier on the oil-water interface, increasing transfer resistance, and decreases water droplet size, increasing the oil-water interface area. Wax exhibits dual regulation on hydrate formation, with a dominant inhibition effect at concentrations above 6 wt%. Wax also dominates the regulation of hydrate dissociation, increasing the difficulty of hydrate plug removal. These findings are valuable for hydrate risk assessment and flow assurance design in deep-water oil and gas fields.
Article
Energy & Fuels
Qianli Ma, Wei Wang, Chuanshuo Wang, Jing Gong
Article
Energy & Fuels
Bingyuan Hong, Xiaoping Li, Shangfei Song, Shilin Chen, Changlong Zhao, Jing Gong
Article
Chemistry, Multidisciplinary
Huirong Huang, Wei Wang, Zeheng Peng, Feng Yang, Xiaofeng Zhang, Yanfen Ding, Kai Li, Chuanshuo Wang, Dongying Gan, Jing Gong
Article
Computer Science, Interdisciplinary Applications
Bingyuan Hong, Xiaoping Li, Guojia Di, Shangfei Song, Weichao Yu, Shilin Chen, Yu Li, Jing Gong
COMPUTERS & INDUSTRIAL ENGINEERING
(2020)
Article
Engineering, Chemical
Guoyun Shi, Di Fan, Jing Gong
CHEMICAL ENGINEERING SCIENCE
(2020)
Article
Energy & Fuels
Chuanshuo Wang, Meng Zhang, Wei Wang, Qianli Ma, Shengnan Zhang, Huirong Huang, Zeheng Peng, Haiyuan Yao, Qingping Li, Yanfen Ding, Jing Gong
Review
Energy & Fuels
Bohui Shi, Shangfei Song, Yuchuan Chen, Xu Duan, Qingyun Liao, Shunkang Fu, Lihao Liu, Jinhao Sui, Junpeng Jia, Haotian Liu, Yumo Zhu, Chenxi Song, Decai Lin, Ting Wang, Junao Wang, Haiyuan Yao, Jing Gong
Summary: This review discusses the significant progress in gas hydrate flow assurance research in China, including hydrate structures, management strategies, development of phase equilibrium models, and kinetics research. Additionally, the current research status and existing problems of hydrate slurry flow are analyzed, indicating significant room for improvement in accurate quantitative calculations and risk assessments.
Article
Energy & Fuels
Qingyun Liao, Bohui Shi, Sha Li, Shangfei Song, Yuchuan Chen, Jinjun Zhang, Haiyuan Yao, Qingping Li, Jing Gong
Summary: This study used molecular dynamics simulations to investigate the impact of wax molecules on methane hydrate formation. The results show that different types and quantities of wax molecules have varying effects on hydrate growth. The addition of wax molecules may promote gas bubble formation and subsequently inhibit hydrate growth.
Article
Chemistry, Multidisciplinary
Kai Li, Wei Wang, Fan Xiao, Yuntong Ge, Hang Jin, Zhipeng Yu, Jing Gong, Weiwei Gao, Zeheng Peng
Summary: The study focuses on the heterointeraction between liquid drops and air bubbles dispersed in another immiscible liquid using atomic force microscopy (AFM) probe techniques. Through fine control of electrical double layer thicknesses and the introduction of a triblock copolymer, the hydrophobic attraction between drops and bubbles is characterized and overcome. The findings provide potential applications in controlling dispersion stability.
Article
Chemistry, Multidisciplinary
Zeheng Peng, Wei Wang, Lin Cheng, Weijie Yu, Kai Li, Yingming Liu, Mengxin Wang, Fan Xiao, Huirong Huang, Yang Liu, Qianli Ma, Bohui Shi, Jing Gong
Summary: The study found that the ethylene vinyl acetate (EVA) copolymer has an impact on the formation of cyclopentane hydrate, elongating its induction time through a cocrystallization effect with wax molecules adjacent to the oil-water interface.
Article
Chemistry, Multidisciplinary
Yuntong Ge, Wei Wang, Kai Li, Fan Xiao, Zhipeng Yu, Jing Gong, Hang Jin, Ang Li
Summary: Crude oil adhesion is a common problem in the petroleum industry, affecting production efficiency and maintenance costs. Developing antifouling materials and understanding the adhesion mechanism is important. This study constructed a superhydrophilic/underwater superoleophobic PAFC coating with excellent antifouling properties. The adhesion mechanism was investigated using atomic force microscopy (AFM) droplet probe technique. The results showed that the PAFC modification achieved the best effect at a molar ratio of 1:3 between phytic acid (PA) and FeCl3 (FC).
Article
Chemistry, Multidisciplinary
Fan Xiao, Kai Li, Wei Wang, Yuntong Ge, Zhipeng Yu, Zeheng Peng, Yingming Liu, Jing Gong
Summary: The stabilization mechanism of water-in-oil emulsions was studied using atomic force microscopy to measure the interactions between water droplets in n-tetradecane. The addition of oil-soluble surfactants (Span 20) was found to prevent water droplet coalescence by adsorbing onto the interface and forming a tight layer. The presence of water-soluble surfactants (SDS/CTAB/Tween 80) had varying effects on droplet stability, with Tween 80 destabilizing the droplets due to competitive adsorption with Span 20.
Article
Materials Science, Multidisciplinary
Hang Jin, Wei Wang, Zhipeng Yu, Yun Shen, Kai Li, Hongli Chang, Yuntong Ge, Jing Gong
ACS APPLIED POLYMER MATERIALS
(2019)