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
Chemistry, Multidisciplinary
Xiaofang Lv, Yang Liu, Shidong Zhou, Bohui Shi, Kele Yan
Summary: The study investigates the decomposition mechanism of hydrate slurry and proposes that desorption of gas from the surface of decomposed particles may be the main cause of particle coalescence. A comprehensive kinetic model considering influencing factors such as intrinsic kinetics, heat, and mass transfer is proposed, using fugacity difference as the driving force for hydrate decomposition. The model integrates heat and mass transfer effects and can describe trends in gas release and dissociation rate in experimental flow systems.
Article
Energy & Fuels
Marshall A. Pickarts, Sriram Ravichandran, Nur Aminatulmimi Ismail, Hannah M. Stoner, Jose Delgado-Linares, E. Dendy Sloan, Carolyn A. Koh
Summary: This study presents a conceptual model for gas hydrate formation during cold restart of non-surface active hydrocarbons. It discusses the mechanisms of phase separation and prolonged cooling that lead to rapid and confined gas hydrate growth upon restart. The experimental and theoretical results support the proposed model and offer new directions for gas hydrate research and analysis.
Article
Green & Sustainable Science & Technology
Oghenethoja Monday Umuteme, Sheikh Zahidul Islam, Mamdud Hossain, Aditya Karnik
Summary: This study addresses the research gap in predicting hydrate deposition rates during shutdown scenarios in subsea gas pipelines. By utilizing a multiple linear regression modeling approach, a reliable model has been developed to predict hydrate deposition rates, which can estimate the risk and depositional volumes in subsea gas pipelines, contributing to maintenance planning and energy sustainability.
Article
Engineering, Chemical
Zaixing Liu, Weiguo Liu, Chen Lang, Ran Liu, Yongchen Song, Yanghui Li
Summary: A new viscosity model for hydrate slurries was developed based on the Camargo-Palermo model and the bimodal suspension model, and validated through rheological measurements using a high-pressure rheometer. The model predictions matched well with experimental data in metastable hydrate suspension systems with varying initial water cuts or water conversion rates.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Dongxu Zhang, Qiyu Huang, Wei Wang, Huiyua Li, Haimin Zheng, Rongbin Li, Weidon Li, Weimin Kong
Summary: This study investigates and compares the effects of waxes and asphaltenes on CO2 hydrate nucleation and decomposition, finding that asphaltenes have a more pronounced effect in retarding hydrate nucleation compared to waxes. Waxes mainly restrict gas diffusion during hydrate nucleation, while asphaltenes enhance nucleation by being more effectively adsorbed on the surface of water droplets and hydrate nuclei.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Guobiao Zhang, Youhong Sun, Bing Li, Yifeng Shen, Yun Qi
Summary: Research has found that in the dissociation of mixed hydrates, CH4 and C2H6 are preferentially released over C3H8. Gas sweep method can continue the decomposition of mixed hydrates and recover more C3H8 at the beginning. The formation and decomposition of the C3H8-rich hydrate shell may control the decomposition rate of mixed hydrates.
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
Jihao Pei, Zhiyuan Wang, Jianbo Zhang, Binbin Zhang, Nan Ma, Baojiang Sun
Summary: In this study, a new hydrate formation model is developed for reduced-diameter pipes in deep-water gas production and transportation. The model takes into account the throttling effect and uneven thickness distributions of the liquid film on the wall. By solving the deposition velocities of hydrate particles and considering the shedding process of the hydrate layer, the thickness of the deposition layer and blockage time can be accurately predicted. The study establishes a theoretical basis for predicting and preventing hydrate risks in gas transportation pipelines with complex structures.
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
Wenlong Jia, Fan Yang, Changjun Li, Ting Huang, Shuoshuo Song
Summary: A unified thermodynamic model is proposed in this paper to describe the multiple interactions of acid gas/water/alcohol/electrolyte components on gas, liquid, and hydrate phases. The model achieves high accuracy in predicting hydrate formation conditions and demonstrates better performance in mixtures containing alcohols and/or electrolytes.
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
Marshall Pickarts, Sriram Ravichandran, Jose Delgado-Linares, Erika Brown, Vinod Veedu, Carolyn A. Koh
Summary: This study aims to investigate the implications of transient conditions on gas hydrate formation mechanisms and explore a possible mitigation strategy of a surface treatment. It was found that an omniphobic surface treatment affects initial gas hydrate deposition and its wall adherence strength, as well as the overall plugging outcome. This research is important for a better understanding of phase separated gas hydrate systems and passive deposition mitigation strategies.
Article
Energy & Fuels
Wenyuan Liu
Summary: In this study, a novel mathematical prediction model of hydrate formation risk in deepwater submarine pipelines was established. The model was applied and sensitivity analysis of typical factors was carried out. The model prediction results showed that the hydrate formation region often exists in submarine pipelines due to the low temperature of the seabed, and it increases with the decrease in seawater temperature. Additionally, the temperature drop and the length of the hydrate formation region decrease with the increase of gas transmission rate and gas transport temperature.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Review
Energy & Fuels
Salma Elhenawy, Majeda Khraisheh, Fares Almomani, Mohammad A. Al-Ghouti, Mohammad K. Hassan, Ala'a Al-Muhtaseb
Summary: Gas hydrate blockage is a major issue in the oil/gas industry, causing significant financial losses and safety risks. To tackle this issue, physical methods and chemical inhibitors are used. Physical methods involve thermal heating and depressurization, while chemical inhibitors are classified into high dosage and low dosage. This study discusses the application of these methods and inhibitors.
Review
Energy & Fuels
Weibing Tian, Keliu Wu, Yin Gao, Zhangxin Chen, Yanling Gao, Jing Li
Summary: Imbibition plays a crucial role in enhanced oil recovery, benefiting reservoirs like fractured ones, conventionally developed by water-injection, and unconventional ones with abundant micro-nanopores. Understanding the mechanisms and governing factors of EOR by imbibition can contribute to better exploitation of oil and gas resources.
Article
Engineering, Chemical
Zheng Sun, Suran Wang, Hao Xiong, Keliu Wu, Juntai Shi
Summary: Efficiency in transport is crucial for energy conversion and water filtration. A simple model regarding nanocone structure design has been established to bridge the knowledge gap. Results show that optimal nanocone geometry can achieve the best flow behavior, providing a theoretical framework for nanocone design.
Article
Engineering, Chemical
Zheng Sun, Bingxiang Huang, Shuhui Yan, Shuolong Wang, Keliu Wu, Weichao Yu, Yaohui Li, Suran Wang
Summary: In this article, the nanoconfinement effect is studied and the impact of surface wettability on confined substance behavior is revealed. By modifying the Peng-Robinson equation of state and considering the shift of critical properties induced by surface affinity, the study describes the effect of both pore size shrinkage and surface wettability on substance interaction. Experimental results show that nanoconfined methane behavior exhibits characteristics different from what traditional models predict.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Shan Wu, Zhuang Xu, Qingzhen Wang, Zheng Sun
Summary: This study investigates the effect of surface wettability on nanoconfined fluid critical properties. The research proposes a correlation between surface contact angle and critical property shift, and establishes a linear relationship between the wettability effect and adsorption thickness. A prediction model for nanoconfined fluid critical properties is developed and validated. The results show that the shift of fluid critical property can reach up to 60%, and both pore size shrinkage and strong fluid-affinity surface contribute to suppressed critical properties at the nanoscale.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Thermodynamics
Weibing Tian, Keliu Wu, Zhangxin Chen, Yanling Gao, Jing Li, Muyuan Wang
Summary: A relative permeability model for tight reservoirs is proposed in this study, taking into account the nanoconfinement effects and dynamic contact angle effects. The results show that the proposed model accurately describes changes in relative permeability in tight reservoirs.
Article
Energy & Fuels
Dong Feng, Zhangxin Chen, Wen Zhao, Keliu Wu, Jing Li, Xiangfang Li, Yanling Gao, Shengting Zhang, Fei Peng
Summary: Knowledge of shale pore structure is crucial for estimating gas storage and predicting gas production. This study obtained the apparent pore size distributions (APSDs) of dry and moist shale and clay samples, and proposed a novel approach to quantitatively determine their contributions to the pore volume. The results showed the difference in pore size distribution between organic matter (OM) and inorganic matter (IOM), and the effect of moisture on the pore volumes.
Article
Energy & Fuels
Dong Feng, Zhangxin Chen, Keliu Wu, Jing Li, Yanling Gao, Jianfei Bi, Shengting Zhang, Fei Peng
Summary: The dynamics of miscible CO2-oil mixtures in nanopores is crucial for CO2 enhanced oil recovery and CO2 storage in shale reservoirs. This study proposes a thermo-kinetic model that considers changes in activation free energy due to thermodynamic and kinetic effects. The model reveals that CO2 can weaken fluid-fluid and fluid-wall interactions, leading to a reduction in local fluid viscosity and an increase in oil flow. The enhancement effect is strengthened by increased wall-oil affinity and CO2 content. The study provides a theoretical foundation for reservoir simulation of CO2-EOR and CO2 storage in shale reservoirs.
Article
Engineering, Chemical
Shan Wu, Hongya Wang, Gang Yuan, Bingying Hu, Zheng Sun, Shuhui Yan, Yaohui Li
Summary: This article investigates the flow capacity of CO2 sequestration in unconventional gas reservoirs, finding that CO2 flow capacity is stronger in smaller nanopores, and temperature and pressure also have an impact on flow capacity. The wettability effect causes significant changes in CO2 flow capacity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Yu Lu, Haitao Li, Junchao Wang, Tao Liu, Keliu Wu
Summary: This study proposes a practical productivity prediction model for fractured horizontal wells based on the volume source method. The model considers the effects of nonlinear seepage, reservoir physical properties, cluster distribution, and non-uniform fracture length on productivity. The model achieves fast convergence and high calculation efficiency and is verified using field data.
Article
Energy & Fuels
Shan Wu, Weinan Luo, Sidong Fang, Zheng Sun, Shuhui Yan, Yaohui Li
Summary: This paper correlates the nanoconfined methane adsorption behavior with the wettability effect for the first time, providing a theoretical framework and research tool for elucidating the methane adsorption mechanism in nanopores.
Article
Geochemistry & Geophysics
Xiaocai Shan, Zhangxin Chen, Boye Fu, Wang Zhang, Jing Li, Keliu Wu
Summary: We introduce a novel deep spatial-sequential graph convolutional network (SSGCN) for predicting total organic carbon (TOC) by leveraging cross-log topological association features and log-specific sequential features, outperforming existing methods. In the southeast Sichuan Basin, SSGCN shows better cross-validation performance and generalizability. Our SSGCN method can predict TOC with an R-2 value of 0.87 within 1 second, increasing efficiency in obtaining TOC parameter. We recommend using graph and sequential convolutions in well-log analysis deep learning architectures.
Article
Chemistry, Physical
Zheng Sun, Bingxiang Huang, Suran Wang, Keliu Wu, Haoze Li, Yonghui Wu
Summary: This research investigates the storage of hydrogen into nanopores using adsorption property, and explores its advantages over traditional high-pressure injection method. The proposed model shows excellent agreements with experimental and simulation data, confirming its reliability. Results indicate that nanopores can store more hydrogen molecules than the traditional high-pressure injection method, and modifying nanopore surface chemistry can significantly improve the adsorption capacity of nanoconfined hydrogen.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Dayong Chen, Zheng Sun
Summary: This study investigates the characteristics of wellbore fluid flow and hydrate flow assurance problems during deep-water gas well cleanup. It reveals the distribution of gas-liquid flow patterns in the wellbore and conducts transient numerical simulations. A hydrate risk prediction model is developed to predict the risk under different cleaning conditions. The results show temperature variation at the wellhead and mud line, different flow patterns in the wellbore under low and high wellhead pressures, and the effectiveness of mitigating hydrate risk through proper cleaning speed and hydrate inhibitors.
Article
Engineering, Chemical
Guodai Wu, Bingxiang Huang, Lijun Cheng, Jinhua Luan, Ruigang Zhang, Ziwei Chen, Chunlin Zeng, Zheng Sun
Summary: The fatal challenge faced by humans is global warming caused by excessive CO2 emissions in the atmosphere. CO2 sequestration, injecting gaseous CO2 into ultra-tight geological sites, is considered a promising method for substantial CO2 reduction. This study focuses on the CO2 storage potential in depleted shale or coal seams where nanopores are abundant, and CO2 molecules are stored in both bulk and adsorption states. Currently, there is a lack of microscopic characterization of CO2 behavior in nanospace, particularly in quantitatively describing the difference between CO2 in adsorption and bulk states.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Zheng Sun, Guodai Wu, Bingxiang Huang, Lijun Cheng, Jinhua Luan, Ruigang Zhang, Ziwei Chen, Chunlin Zeng
Summary: This study investigates the impact of surface-molecule interaction strength on CO2 storage in nanopores and finds that increasing the interaction strength can significantly improve CO2 storage capacity. However, the difference diminishes under high-pressure conditions, and neglecting the shift of CO2 critical properties can lead to overestimation of CO2 density.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)