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wellbore temperature distribution during drilling of natural gas hydrate formation in South China sea

Petroleum 2021年第4期7卷 451-459页

作者： Xiaolong Zhao Yizhong Zhao Zenglin Wang Gang Chen Peng Li Wei Liang Xuefeng Gao Hanming Xu Lin Jiang Na Wei Research Institute of Petroleum Engineering Shengli OilfieldSINOPECDongying257000China Shengli Oilfield Company SINOPECDongying257000China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China State Key Laboratory of Natural Gas Hydrate Beijing10027China

The natural gas hydrate resources in the South China Sea alone are about 85 trillion cubic *** the drilling process of marine gas hydrate,the natural gas hydrate will decompose and produce gas,as the rising of temperature and dropping of the pressure in the *** process will have a significant impact on drilling ***,it is necessary to study the wellbore temperature distribution during the drilling of marine hydrate *** this paper,the wellbore temperature distribution of safe drilling in hydrated formation is taken as the research goal,and the research status of relevant domestic and international wellbore temperatures was *** to the characteristics of the marine environment and reservoir-forming characteristics of hydrate reservoirs in the South China Sea,the wellbore temperature distribution model of offshore drilling wellbore under the condition of hydrate decomposition was *** temperature distribution curve of drilling straight wellbore in hydrate layer of South China Sea was *** drilling the hydrate reservoir,the distribution regularity of the wellbore temperature is similar to that of the conventional offshore drilling ***,the temperature of the wellbore annulus near the hydrate decomposition site is lower than the ambient temperature,mainly due to the hydrate decomposition *** this paper,the sensitivity analysis of several main parameters of the wellbore temperature distribution of drilling straight wellbore in hydrate layer of South China Sea was carried *** the conduction of experiment and numerical simulation,we have get some new findings:(1)The hydrate saturation has little effect on the wellbore temperature;(2)As the drilling fluid displacement increases,the annulus temperature of the wellbore above the mudline increases,and the temperature of the wellbore below the mudline decreases continuously;(3)As the density of the drilling fluid increases,th

关键词： wellbore temperature Natural gas hydrate South China Sea Numerical simulation Sensitivity analysis

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Study on wellbore temperature of riserless mud recovery system by CFD approach and numerical calculation

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Petroleum 2020年第2期6卷 163-169页

作者： Xin Li Jie Zhang Xu Tang Gezhen Mao Peigang Wang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina

The riserless mud recovery(RMR)system abandons the riser used in conventional offshore drilling,and the drill string above the seabed is directly exposed to seawater,resulting in convective heat transfer from the drilling fluid in the drill string to ***,the wellbore temperature distribution in the RMR system is quite different from the conventional offshore *** this paper,based on the heat transfer characteristics of the RMR system,a mathematical model of the thermal field of the RMR system is *** data used in this paper come from a vertical well in the South China *** Fluid Dynamics(CFD)software is used to simulate the temperature distribution in drill string at different seawater depths and different formation depths in this paper,and the simulation results are compared with the calculation results of the mathematical model,so as to verify the feasibility of the mathematical model established in this *** with the calculation results of the mathematical model,this paper also explores the effect of different discharge capacity and different injection temperature of drilling fluid on the wellbore temperature change.

关键词： RMR wellbore temperature Thermal field Mathematical model CFD

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A New Heat Transfer Model for Multi-Gradient Drilling with Hollow Sphere Injection

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Fluid Dynamics & Materials Processing 2024年第3期20卷 537-546页

作者： Jiangshuai Wang Chuchu Cai Pan Fu Jun Li Hongwei Yang Song Deng School of Petroleum and Natural Gas Engineering Changzhou UniversityChangzhouChina CNPC Research Institute of Engineering Technology Co. Ltd.BeijingChina National Engineering Research Center for Oil&Gas Drilling and Completion Technology BeijingChina College of Petroleum Engineering China University of Petroleum(Beijing)BeijingChina College of Petroleum Karamay CampusChina University of Petroleum(Beijing)BeijingChina

Multi-gradient drilling is a new offshore drilling *** accurate calculation of the related wellbore temperature is of great significance for the prediction of the gas hydrate formation area and the precise control of the wellbore *** this study,a new heat transfer model is proposed by which the variable mass flow is properly taken into *** this model,the effects of the main factors influencing the wellbore temperature are *** results indicate that at the position where the separation injection device is installed,the temperature increase of the fluid in the drill pipe is mitigated due to the inflow/outflow of hollow spheres,and the temperature drop of the fluid in the annulus also *** addition,a lower separation efficiency of the device,a shallower installation depth and a smaller circulating displacement tend to increase the temperature near the bottom of the annulus,thereby helping to reduce the hydrate generation area and playing a positive role in the prevention and control of hydrates in deepwater drilling.

关键词： Multi-gradient drilling wellbore temperature hydrate separate injection device variable mass

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