Article
Engineering, Marine
Song Zeng, Liangjie Mao, Qingyou Liu, Guorong Wang, Juan Li
Summary: A dynamic analysis model for natural gas hydrate production riser was established, which considered the internal phase transition of hydrate multiphase flow and external marine environmental loads. The correctness of the model was verified by experiment and field testing data, showing that NGH decomposition in the middle of the riser causes a sudden pressure drop, increasing axial tension and Von Mises stress.
Article
Energy & Fuels
Guoyun Shi, Shangfei Song, Bohui Shi, Jing Gong, Dongliang Chen
Summary: This study proposes a new transient model for gas hydrate slurry flow, which combines a two-fluid model and temperature equation for describing the two-phase flow and establishes equations for the particulate phase flow using Eulerian and Lagrangian approaches. The model is verified and applied to analyze the transient behavior of gas hydrate slurry multiphase flow, as well as conducting sensitivity analysis on flowrate, initial droplet size, and drag force. These results provide practical insight into hydrate slurry multiphase flow and contribute to better hydrate management in the petroleum industry.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Zheng Liu, Baojiang Sun, Zhiyuan Wang, Jianbo Zhang, Xuerui Wang
Summary: A model was established to predict the risk of hydrate reformation in production pipelines during offshore gas hydrate development, studying the region and higher-risk drainage pipe. A new hydrate management strategy by adding additional pumps and heaters was proposed to effectively address potential hydrate reformation risks.
Article
Energy & Fuels
Pavel G. Struchalin, Vegar H. Oye, Pawel Kosinski, Alex C. Hoffmann, Boris Balakin
Summary: This article discusses a flow loop study on the risk of cohesive particle slurries in subsea petroleum production. The study focuses on a slurry with ice particles consistent with 0.23-mm size in decane. The experiments showed that increased viscosity of the slurry led to higher pressure drops and the formation of plugs, with particle concentration also influencing plug formation.
Article
Engineering, Mechanical
Benedict Prah, Rin Yun
Summary: The study investigates the pressure drop and flow pattern analysis of CO2 hydrate slurry, finding that an increase in flow rate leads to an increase in pressure drop gradient. The CO2 hydrate slurry can be divided into active formation and less active formation regions, with flow regimes dependent on the fraction of hydrates in the slurry mixture.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Zhengbiao Peng, Shaolei Gai, Milan Barma, Mohd. Mostafizur Rahman, Behdad Moghtaderi, Elham Doroodchi
Summary: The study examines the gas-liquid-solid flow patterns and characteristics in slurry Taylor flow-based multiphase microreactors, determining their dependence on operating conditions. The research identified four STF patterns based on bubble surface distortion and particle travel between slugs, with different patterns occurring at varying fluid velocities. Empirical correlations were developed to predict bubble rising velocity, bubble size, and slug length in STFRs, valid across a wide range of fluids and channel sizes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Petroleum
Wei Li, Zhaoyi Dai, Xin Wang, Saebom Ko, Samiridhdi Paudyal, Xuanzhu Yao, Cianna Leschied, Yu-Yi Shen, Daniel Pimentel, Amy T. Kan, Mason Tomson
Summary: Aqueous CO2-containing environment in oil and gas production can lead to the formation of carbonate scales such as calcite, as well as corrosion-induced scales like siderite on mild steel surfaces. This study investigated the relationship between corrosion-induced scales and other metal carbonate scales on steel surfaces. It was found that a two-layer scale structure formed, with an inner layer of iron-containing carbonate scale (ankerite or siderite) and an outer layer of calcite. Furthermore, a common scale inhibitor was effective in mitigating scale formation but aggravated steel corrosion.
Article
Energy & Fuels
Jianlu Zhu, Youmei Peng, Zihe Li, Naiya Xie, Yixiang Zhang, Wuchang Wang, Yuxing Li
Summary: In the context of energy transformation, the demand for liquefied natural gas (LNG) is increasing and research on leakage during storage and transportation is needed. High expansion foam technology is effective in mitigating LNG vapor hazard. This study found that hydrates are formed when LNG and water are present in foam under atmospheric pressure. The absorption effect of hydrates on LNG vapor was studied using experimental equipment, and the heat transfer model of high expansion foam covered LNG was established. The formation and characteristics of hydrates in the LNG-high expansion foam system were analyzed. The results show that the foam hydrate solid can absorb large amounts of alkanes and is crucial for improving the effectiveness of high-expansion foam technology.
Article
Engineering, Environmental
Shengli Li, Shijing Zhang, Kai Su, Qiang Liu, Haonan Wu, Zhiyong Chang
Summary: This study investigates the formation and decomposition processes of binary and ternary gas hydrates. The results show that in the formation stage, CH4 is adsorbed in the hydrate cages constructed by C2H6 and C3H8. During the decompositions, CH4 and C2H6 molecules are preferentially released from the hydrate structures, while C3H8 molecules can stay in the hydrate phase.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Peng Xiao, Bao-Can Dong, Jia Li, Hong-Liang Zhang, Guang-Jin Chen, Xing Huang
Summary: In this study, the filtration of hydrate particles from hydrate slurries, which is a crucial step for continuous hydrate production, was investigated. The specific resistances of the hydrate cakes formed under different pressure drops were measured. It was found that increasing pressure drop led to an increase in specific resistance, particularly in the second stage. An approach involving filtration mediums, additives, and pressure drops was proposed for efficient filtration of hydrate slurries, and a continuous hydrate production process was suggested based on the results.
Article
Engineering, Chemical
Jai Krishna Sahith Sayani, Vinayagam Sivabalan, Khor Siak Foo, Srinivasa Rao Pedapati, Bhajan Lal
Summary: An artificial intelligence model is developed to accurately predict the gas hydrate formation rate and reaction kinetics in multiphase transmission pipelines. The multilayer perceptron (MLP) model demonstrates higher prediction accuracy.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Energy & Fuels
Jai Krishna Sahith Sayani, Muhammad Saad Khan, Srinivasa Rao Pedapati, Bhajan Lal
Summary: This study experimentally investigated the thermodynamic conditions of gas hydrate formation in natural gas systems with high CO2 levels. It was found that gas mixtures with higher CO2 content promoted the formation of gas hydrates compared to pure methane gas systems, but in multiphase systems, all gases exhibited inhibitory effects.
Article
Engineering, Chemical
Xiaolin Ping, Guoqing Han, Jiqun Zhang, Junhua Chang, Xueqi Cen, Hui Tang
Summary: This paper analyzes the mechanism of combined depressurization and heat injection exploitation of NGH and establishes the multiphase flow models of the injection well and production well for the parallel horizontal NGH well production system with this combined method. The factors affecting the temperature and pressure distributions in the wellbore are analyzed, and the study provides theoretical guidance for the combined extraction with depressurization and heat injection method and production optimization of NGH.
Article
Thermodynamics
Yilong Yuan, Ye Gong, Tianfu Xu, Huixing Zhu
Summary: In this study, a coupled simulator was developed to investigate the thermo-hydro-mechanical responses of offshore hydrate reservoirs. The results showed that the geomechanical response had a negative impact on the flow, and depressurization caused an increase in shear stress and vertical compaction in the reservoir. The reservoir heterogeneity led to non-uniform dissociation of hydrates and changes in effective stress. The findings of this study are helpful for designing safe hydrate production schemes in the future.
Article
Engineering, Environmental
Xuewen Cao, Kairan Yang, Jiang Bian
Summary: A new CO2 hydrate slurry transport mode allowing partial dissociation of hydrate particles was proposed in this study to reduce costs and improve transportability. Experimental and multiphase flow model results showed that hydrate dissociation can decrease the viscosity of CO2 hydrate slurry flow, reducing pressure drop, increasing transportability, and decreasing the risk of hydrate blockage induced by agglomeration in pipes.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
