Explanipedia

Horizontal Wellbore Stability in the Production of Offshore Natural Gas Hydrates via Depressurization Open

Zhengfeng Shan, Zhiyuan Wang, Shipeng Wei, Peng Liu, Ya Feng Li , et al. · 2025

Wellbore stability is a crucial factor affecting the safe exploitation of offshore natural gas hydrates. As a sustainable energy source, natural gas hydrate has significant reserves, high energy density, and low environmental impact, makin…

Cement slurry displacement efficiency in ultra-deep wells: A thermal-pressure-dependent rheology model Open

X. Wang, Mengyao Dong, Baojiang Sun, Zhiyuan Wang, Yonghai Gao , et al. · 2025

In recent years, 60 % of the world's new oil and gas reserves come from deep layers. The total amount of deep/ultra-deep resources in China is 67.1 billion tons of oil equivalent, accounting for 34 % of the national total. However, extreme…

Dynamic Behavior of a Rotationally Restrained Pipe Conveying Gas-Liquid Two-Phase Flow Open

Guangming Fu, Haoyue Jiao, Aixia Zhang, Xiao Wang, Boying Wang , et al. · 2025

This study explores the dynamic behavior of a vertical pipe conveying gas-liquid two-phase flow with rotationally restrained boundaries, employing the generalized integral transform technique (GITT). The rotationally restrained boundary co…

Vibration analysis of a pipe conveying two-phase flow with an improved drift-flow model Open

Guangming Fu, Boying Wang, Aixia Zhang, Xiao Wang, Haoyue Jiao , et al. · 2025

A Potential Commercialization Method for Gas Production from Off-Shore Hydrate Reservoirs Open

Baojiang Sun, Jinsheng Sun, Youqiang Liao, Miao Dong, Jie Zhong , et al. · 2025

Depressurization and heat injection are viewed as the main methods to be used in natural gas hydrate (NGH) exploitation. However, these methods have limitations, such as low energy-utilization efficiency or a limited extraction range, and …

Experimental Study on Combustion Characteristics of Methane Vertical Jet Flame Open

Yudan Peng, Jing Yu, Weifeng Chen, Chen Hao, Jiawei Zhang , et al. · 2025

A jet flame is a common type of flame in fires in the oil and gas industries. At present, research on jet flames is still not comprehensive enough. To systematically investigate the combustion characteristics of vertical methane jet flames…

Deformation and migration characteristics of bubbles moving in gas-liquid countercurrent flow in annulus Open

Bangtang Yin, Tan Ding, Shulong Wang, Zhiyuan Wang, Baojiang Sun , et al. · 2025

The gas-liquid countercurrent flow pattern is complex and the bubble migration velocity is difficult to predict in the process of bullheading well killing. The experiment on bubble migration in gas-liquid countercurrent flow in annulus is …

A shut-in pressure calculation method for high-temperature high-pressure wells in deepwater fractured formations based on thermo-hydro-mechanical coupling Open

Gang Chen, Zhiyuan Wang, Xiaohui Sun, Jie Zhong, Jianbo Zhang , et al. · 2025

By comprehensively considering the influences of temperature and pressure on fluid density in high temperature and high pressure (HTHP) wells in deepwater fractured formations and the effects of formation fracture deformation on well shut-…

Gas kick and lost circulation risk identification method with multi-parameters based on support vector machine for drilling in deep or ultradeep waters Open

Kai Feng, Shujie Liu, Zhiming Yin, Yi-long Xu, Meipeng Ren , et al. · 2025

In deepwater and ultra-deepwater drilling, formation pressures are complex and the drilling fluid density window is narrow, which makes it prone to well control incidents such as kicks and lost circulation. To ensure safe, efficient, and c…

Research on Key Parameters of Wellbore Stability for Horizontal Drilling in Offshore Hydrate Reservoirs Open

Zhengfeng Shan, Xiansi Wang, Zeqin Li, Zhenggang Gong, Nan Ma , et al. · 2024

The South China Sea has abundant reserves of natural gas hydrates, and if developed effectively, it can greatly alleviate the pressure on the energy supply in China. But the hydrate reservoirs in the sea area are loose, shallow, porous, an…

Extract of Silybum marianum (L.) Gaertn Leaves as a Novel Green Corrosion Inhibitor for Carbon Steel in Acidic Solution Open

Yubin Wang, Lingjie Li, Jinbei He, Baojiang Sun · 2024

In this work, leaves of Silybum marianum (L.) Gaertn were extracted by a one-step extraction method using ethanol as a solvent, and the Silybum marianum (L.) Gaertn extract (SMGE) was firstly employed as a green corrosion inhibitor for car…

Research on heat transfer law of multiphase flow in wellbore under coexistence of overflow and lost circulation in deepwater drilling Open

Xin Yu, Yonghai Gao, Xinxin Zhao, Hongxing Yuan, Luxiang Liu , et al. · 2024

A reliable and accurate wellbore heat transfer model is essential for making critical decisions during deepwater drilling operations. This study develops a transient coupled flow model for the coexistence of overflow and lost circulation s…

Study on the Evolution Law of Wellbore Stability Interface during Drilling of Offshore Gas Hydrate Reservoirs Open

Xuefeng Li, Baojiang Sun, Baojin Ma, Hao Li, Huaqing Liu , et al. · 2023

The study of wellbore stability in offshore gas hydrate reservoirs is an important basis for the large-scale exploitation of natural gas hydrate resources. The wellbore stability analysis model in this study considers the evolution of the …

Quantitative Investigation of Fracture Apertures during Temporary Plugging and Diverting Fracturing Open

Yubin Wang, Baojiang Sun, Tianju Wang, Zhiwei Hao, Bo Wang · 2023

Oil and gas resources are closely related to daily life and are an important support for the economy of a city or even a country. Hydraulic fracturing is an indispensable technique to economically develop oil and gas resources through crea…

Quantitative Investigation of the Fracture Aperture during Temporary Plugging and Diverting Fracturing Open

Yubin Wang, Baojiang Sun, Tianju Wang, Zhiwei Hao, Bo Wang · 2023

Hydraulic fracturing is an efficient method to develop oil/gas resources economically. Temporary plugging and diverting fracturing (TPDF) can generate diversion fractures perpendicular to the initial fractures and enhance the stimulated ar…

Flexible Riser Tensile Armor Modelling Method and Application to Fatigue Analysis Open

Ning Zhang, Sen Li, Baojiang Sun, Chloe Huang, Kevin Chih‐Yang Huang , et al. · 2023

In this paper, we present a new stress calculation method for flexible structures, particularly, tensile armors, and apply it to flexible riser fatigue analysis. The method is based on a 3-dimensional curved bar theory. First, the tensile …

Flexible Riser Tensile Armor Modelling Method and Application to Fatigue Analysis Open

Ning Zhang, Sen Li, Baojiang Sun, Chloe Huang, Kevin Chih‐Yang Huang , et al. · 2023

In this paper, we present a new stress calculation method for flexible structures, particularly, the tensile armors, and apply it to flexible riser fatigue analysis. The method is based on a 3-dimensional curved bar theory. First, the tens…

Advances in Organic–Inorganic Hybrid Latex Particles via In Situ Emulsion Polymerization Open

Yubin Wang, Baojiang Sun, Zhiwei Hao, Jianhua Zhang · 2023

Hybrid latex particles combine the unique properties of inorganic nano/micro particles with the inherent properties of polymers, exhibiting tremendous potential for a variety of applications. Recent years have witnessed an increased intere…

Proppant transport in rough fractures of unconventional oil and gas reservoirs Open

Bangtang Yin, Zhang Chao, Zhiyuan Wang, Baojiang Sun, Yonghai Gao , et al. · 2023

A method to generate fractures with rough surfaces was proposed according to the fractal interpolation theory. Considering the particle-particle, particle-wall and particle-fluid interactions, a proppant-fracturing fluid two-phase flow mod…

Integral Sliding Mode Variable Structure Control of Synchronous Reluctance Motors Open

ChunLin Chu, Xiaoxiao You, Baojiang Sun, TianYuan Zhang · 2023

Aiming at the problem of jitter in the speed when the load changes abruptly during the operation of a synchronous reluctance motor and the poor resistance to load disturbance, an integral type sliding film variable structure control algori…

Research on Finite Element Analysis and Torque Ripple Suppression of the Switched Reluctance Motor Open

Xiaoxiao You, ChunLin Chu, TianYuan Zhang, Baojiang Sun · 2023

To repress the torque ripple of the switched reluctance motor, this study takes a three-phase 12/8-pole switched reluctance motor as an instance and simulates the electromagnetic field of the motor using Maxwell finite element software to …

Bending Deformation and Ultimate Moment Calculation of Screen Pipes in Offshore Sand Control Completion Open

Yudan Peng, Guangming Fu, Baojiang Sun, Xiaohui Sun, Jiying Chen , et al. · 2023

Horizontal wells, extended-reach wells, and multi-branch wells were often used to exploit subsea oil and gas efficiently. However, during the sand control screen completion of those wells, the sand control screen pipe was easily deformed. …

Dynamic well killing method based on Y-tube principle when the drill bit is off-bottom Open

Bangtang Yin, Meipeng Ren, Shujie Liu, Wei Zhang, Jing Zhao , et al. · 2023

The design of dynamic well killing parameters lacks theoretical support because the U-tube principle is not applicable while drilling bit is not at the well bottom. We present the Y-tube principle and establish a gas and liquid two-phase f…

Experiments and Modeling of Phase Behavior and Volumetric Properties of Complex Components Gas Condensate at Pressures Up to 120 Mpa Open

Qian Ding, Baojiang Sun, Haikang He, Xiaohui Sun, Jianbo Zhang , et al. · 2023

Experimental Study on the Evolution of Hydrate Formation and Blockage in a Water-Dominated Bubbly Flow System Open

Qingwen Kong, Xuwen Qin, Zhiyuan Wang, Jianbo Zhang, Shikun Tong , et al. · 2023

Effects of Gas Dissolution on Gas Migration during Gas Invasion in Drilling Open

Haikang He, Baojiang Sun, Xiaohui Sun, Zhiyuan Wang, Xuefeng Li · 2022

[This corrects the article DOI: 10.1021/acsomega.2c04097.].

A high-resolution upwind numerical scheme for solving transient multiphase flow in wellbore Open

Dalin Sun, Baojiang Sun, Zhiyuan Wang, Wenqiang Lou · 2022

The identification of gas-liquid interface is the basis for accurate calculation of wellbore flow parameters after gas invasion, which plays an important role in the safety and reliability of drilling engineering. At present, most petroleu…

High-precision nonisothermal transient wellbore drift flow model suitable for the full flow pattern domain and full dip range Open

Wenqiang Lou, Dalin Sun, Xiaohui Sun, Pengfei Li, Yaxin Liu , et al. · 2022

A reliable multiphase flow simulator is an important tool to improve wellbore integrity and production decision-making. To develop a multiphase flow model with high adaptability and high accuracy, we first build a multiphase flow database …

Effects of Gas Dissolution on Gas Migration during Gas Invasion in Drilling Open

Haikang He, Baojiang Sun, Xiaohui Sun, Zhiyuan Wang, Xuefeng Li · 2022

Sour gas reservoirs (including CO₂ and H₂S) are vulnerable to gas invasion when drilling into reservoir sections. The high solubility of the invaded gas in drilling fluid makes the gas invasion monitoring "hidden" and…

Inhibition Mechanism of EMIM-Cl to Methane Gas Hydrate by Molecular Dynamics Simulation Open

Guizhen Xin, Na Xu, Hongwei Li, Faling Yin, Yaqiang Qi , et al. · 2022

Deep-water gas well testing is a key technology for obtaining reservoir production and physical property parameters. However, gas hydrates could easily form and cause blockage in the low-temperature and high-pressure environment on the sea…

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