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Multi-scale elastoplastic mechanical model and microstructure damage analysis of solid expandable tubular

Chinese Physics B 2020年第10期29卷 336-348页

作者： Hui-Juan Guo Ying-Hua Liu Yi-Nao Su Quan-Li Zhang Guo-Dong Zhan Department of Engineering Mechanics AMLTsinghua UniversityBeijing 100084China drilling Mechanical Department CNPC Engineering Technology R&D Company LimitedBeijing 102206China drilling Technology division EXPEC Advanced Research CenterSaudi Arabia

We present an in-depth study of the failure phenomenon of solid expandable tubular (SET) due to large expansion ratio in open holes of deep and ultra-deep wells. By examining the post-expansion SET, lots of microcracks are found on the inner surface of SET. Their morphology and parameters such as length and depth are investigated by use of metallographic microscope and scanning electron microscope (SEM). In addition, the Voronoi cell technique is adopted to characterize the multi-phase material microstructure of the SET. By using the anisotropic elastoplastic material constitutive model and macro/microscopic multi-dimensional cross-scale coupled boundary conditions, a sophisticated and multi-scale finite element model (FEM) of the SET is built successfully to simulate the material microstructure damage for different expansion ratios. The microcrack initiation and growth is simulated, and the structural integrity of the SET is discussed. It is concluded that this multi-scale finite element modeling method could effectively predict the elastoplastic deformation and the microscopic damage initiation and evolution of the SET. It is of great significance as a theoretical analysis tool to optimize the selection of appropriate tubular materials and it could be also used to substantially reduce costly failures of expandable tubulars in the field. This numerical analysis is not only beneficial for understanding the damage process of tubular materials but also effectively guides the engineering application of the SET technology.

关键词： solid expandable tubular(SET) material microstructure damage multi-scale elastoplastic model virtual failure

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Evolution and application of in-seam drilling for gas drainage

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International Journal of Mining Science and Technology 2013年第4期23卷 534-544页

作者： Frank Hungerford Ting Ren Naj Aziz drilling division Valley Longwall International Pty Ltd. School of Civil Mining & Environmental Engineering University of Wollongong

The presence of seam gas in the form of methane or carbon dioxide presents a hazard to underground coal mining ***-seam drilling has been undertaken for the past three decades for gas drainage to reduce the risk of gas outburst and lower the concentrations of seam gas in the underground *** drilling practices have reflected the standards of the times and have evolved with the development of technology and equipment and the needs to provide a safe mining environment *** practice was to adapt equipment from other felds,with rotary drilling being the only form of drilling *** form of drainage allowed various levels of gas drainage coverage but with changing emphasis,research and development within the coal industry has created specifc equipment,technology and practices to accurately place in-seam boreholes to provide effcient and effective gas *** into gas content determination established a standard for the process and safe levels for mining operations to *** technology improved from the wire-line,single-shot Eastman survey instruments which was time-dependent on borehole depth to electronic instruments located in the drill string which transmitted accurate survey data to the drilling crew without time *** allowed improved directional control and increased drilling *** drilling technology has now been established as the industry standard to provide effective gas drainage *** was identifed as an additional beneft with directional drilling as it has the ability to provide exploration data from long *** ability of the technology to provide safe and reliable means to investigate the need for inrush protection and water drainage ahead of mining has been *** drilling technology has now been introduced to the Chinese coal industry for gas drainage through a practice of auditing,design,supply,training and ongoing ***

关键词： Gas outbursts In-seam drilling Gas drainage Directional drilling technology Gas content determination Geological exploration

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Distribution laws and effects analysis of casing external pressure taking elastic parameters matching into account

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Petroleum 2016年第1期2卷 108-115页

作者： Hongkun Zhang Baojiang Sun Guomin Yan ZhiyuanWang Mingzhao Huang School of Petroleum Engineering China University of PetroleumNo.66Changjiang West RoadHuangdao DistrictQingdao 266580China drilling division CNPC Offshore Engineering CompanyTianjin 300280China

Distribution laws of casing external pressure,which are obtained by different scholars in different conditions,are not the ***,a model to calculate the external pressure of casing is established with finite element *** the model a contact is built between the outer wall of the casing and the inner wall of the cement *** casing external pressure can be got through extracting contact force of *** numerical results and analysis show that:The largest casing external pressure exists in the direction of minimum horizontal stress of formation rather than in the direction of the maximum horizontal *** exists such matching between the cement sheath elastic modulus and formation elastic modulus:When the elastic modulus of the cement sheath is small,reducing its value is conducive to reduce the casing external pressure and to prolong casing service *** the elastic modulus of the cement sheath is large,increasing its value is conducive to reduce the casing external pressure and to prolong casing service *** casing external pressure will become large with the increase of Poisson's ratio of cement *** the increase of the degree of the formation stress unevenness,the maximum casing external pressure increases and the smallest external *** increasing of the non-uniformity degree of formation stress makes the non-uniformity degree of casing external pressure and the risk of casing failure *** study can provide certain reference for drilling workers to take measures to prolong service life of casing.

关键词： External pressure Casing failure Service life Elastic modulus Poisson's ratio

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Reverse time migration based on normalized wavefield decomposition imaging condition

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Global Geology 2016年第2期19卷 95-101页

作者： YU Jianglong HAN Liguo ZHOU Yan ZHANG Yongsheng College of Geo-Exploration Science and Technology Jilin University drilling division CNPC Offshore Engineering Corporation

With the increasing complexity of prospecting objectives,reverse time migration( RTM) has attracted more and more attention due to its outstanding imaging quality. RTM is based on two-way wave equation,so it can avoid the limits of angle in traditional one-way wave equation migration,image reverse branch,prism waves and multi-reflected wave precisely and obtain accurate dynamic information. However,the huge demands for storage and computation as well as low frequency noises restrict its wide application. The normalized cross-correlation imaging conditions based on wave field decomposition are derived from traditional cross-correlation imaging condition,and it can eliminate the low-frequency noises effectively and improve the imaging resolution. The practical procedure includes separating source and receiver wave field into one-way components respectively,and conducting cross-correlation imaging condition to the post-separated wave field. In this way,the resolution and precision of the imaging result will be promoted greatly.

关键词： reverse time migration low-frequency noises imaging condition wave field decomposition

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Preparation of a functional fracturing fluid with temperature-and salt-resistance,and low damage using a double crosslinking network

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Petroleum Science 2023年第5期20卷 3223-3230页

作者： Yang Zhang An Chen Jin-Cheng Mao Song-Hai Qin Jin Li Xiao-Jiang Yang Chong Lin Zhi-Yu Huang Ya-Fei Liu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan610500China Development division PetroChina Southwest Oil and Gas Field CompanyChengduSichuan610066China Downhole Services Company CNPC Bohai Drilling Engineering Company LtdRenqiuHebei062550China Sinopec Zhongyuan Oilfield Company PuyangHenan457001China

Fracturing fluids(FFs)have been widely used to stimulate the tight ***,current FFs will not only lose their rheological property at high temperatures and high salt but also show an incomplete gel-breaking ***,a double crosslinking network FF with pretty superiorities in rheology and low damage to the core was constructed by introducing both physical crosslinking and chemical crosslinking into the *** construction of double crosslinking networks enhanced the rheology of this functional *** particle sizes of gel-breaking fluids are mainly distributed in 1.0e10,000 nm;furthermore,for every 10,000 mg/L increase in salinity,the particle size of the gel-breaking fluid is decreased by almost *** adsorption capacity(<1.0 mg/g)gradually decreased with the increase of salinity at 20℃.Moreover,the adsorption of gel-breaking fluids on the rock decreased first and then kept stable with temperature increasing at a salinity of ≤30,000 mg/L,however,showed the opposite trend at 40,000 mg/*** results of rheology,particle size,static adsorption,and core damage showed that this functional FF could be an alternative for the stimulation of a tight reservoir with high temperature and recycling of produced water with high salinity.

关键词： Fracturing fluid Temperature-and salt-resistance Particle size Static adsorption Low damage

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Wellbore-heat-transfer-model-based optimization and control for cooling downhole drilling fluid

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Petroleum Science 2024年第3期21卷 1955-1968页

作者： Chao Wang He Liu Guo-Wei Yu Chen Yu Xian-Ming Liu Peng Huang Yangtze University Jingzhou434023HubeiChina State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing2249China CNPC Bohai drilling Engineering Co. LtdTianjin300280China Exploration Development and Construction Engineering division of PetroChina Jidong Oilfield Company Tangshan63200HebeiChin Henan University of Urban Construction Pingdingshan467036HenanChina

To address the two critical issues of evaluating the necessity of implementing cooling techniques and achieving real-time temperature control of drilling fluids underground in the current drilling fluid cooling technology,we first established a temperature and pressure coupled downhole heat transfer model,which can be used in both water-based and oil-based drilling ***,fourteen factors,which could affect wellbore temperature,were *** on the standard deviation of the downhole temperature corresponding to each influencing factor,the influence of each factor was *** influencing factors that can be used to guide the drilling fluid's cooling technology were drilling fluid thermal conductivity,drilling fluid heat capacity,drilling fluid density,drill strings rotation speed,pump rate,viscosity,ROP,and injection *** nondominated sorting genetic algorithm was used to optimize these six parameters,but the optimization process took 182 *** these eight parameters'influence rules with the nondominated sorting genetic algorithm can reduce the optimization time to 108 ***,the downhole temperature has been demonstrated to increase with the inlet temperature increasing linearly under quasi-steady *** this law and PID,the downhole temperature can be controlled,which can reduce the energy for cooling the surface drilling fluid and can ensure the downhole temperature reaches the set value as soon as possible.

关键词： drilling Cooling Influencing factors Analysis Optimization Control

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Molecular simulations of charged complex fluids: A review

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Chinese Journal of Chemical Engineering 2021年第3期34卷 206-226页

作者： Zhiyong Xu Zhongjin He Xuebo Quan Delin Sun Zhaohong Miao Hai Yu Shengjiang Yang Zheng Chen Jinxiang Zeng Jian Zhou School of Chemistry and Chemical Engineering Guangdong Provincial Key Lab for Green Chemical Product TechnologySouth China University of TechnologyGuangzhou 510640PR China National Center for International Research on Deep Earth drilling and Resource Development Faculty of EngineeringChina University of GeosciencesWuhan 430074China Biosciences and Biotechnology division Physical and Life Sciences DirectorateLawrence Livermore National LaboratoryLivermoreCA 94550USA

Molecular simulation plays an increasingly important role in studying the properties of complex fluid systems containing charges,such as ions,piezoelectric materials,ionic liquids,ionic surfactants,polyelectrolytes,zwitterionic materials,nucleic acids,proteins,biomembranes and etc.,where the electrostatic interactions are of special *** methods have been available for treating the electrostatic interactions in explicit and implicit solvent *** and efficient treatment of such interactions has therefore always been one of the most challenging issues in classical molecular dynamics simulations due to their inhomogeneity and long-range ***,two major challenges remain in the application field of electrostatic interactions in molecular simulations;(i)improving the representation of electrostatic interactions while reducing the computational costs in molecular simulations;(ii)revealing the role of electrostatic interactions in regulating the specific properties of complex *** this review,the calculation methods of electrostatic interactions,including basic principles,applicable conditions,advantages and disadvantages are summarized and ***,the specific role of electrostatic interactions in governing the properties and behaviors of different complex fluids is emphasized and ***,challenges and perspective on the computational study of charged systems are given.

关键词： Molecular simulation Complex fluid Charged system Soft matter Electrostatic interaction

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Experimental study on gas slippage of Marine Shale in Southern China

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Petroleum 2016年第2期2卷 171-176页

作者： Ying Ren Xiao Guo Chuan Xie Hongqin Wu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityNo.8Xindu AvenueXindu DistrictChengdu 610500China Shunan division of Southwest Oil and Gasfield Company PetroChinaSichuanLuzhou 646000China Research Institute of drilling Engineering Sinopec Southwest Petroleum Engineering CompanySichuanDeyang 618000China

The shale gas reservoirs are composed of porous media of different length scales such as nanopores,micropores,natural fractures and hydraulic fractures,which lead to high *** flow from pores to fractures is under different flow regimes and in the control of various flow *** gas slippage would have significant effects on gas flow in *** obtain the effect of slippage on gas flow in matrix and fractures,contrast experiments were run by using cores with penetration fractures and no fractures from Marine Shale in Southern China under constant confining *** results showed that slippage effect dominates and increases the gas permeability of cores without *** cores with penetration fractures,slippage effect is associated with the closure degree of *** dominates when fractures close under low pore *** weakens due to the fractures opening under high pore *** opening reduces the seepage resistance and slippage *** Forchheimer effect occurs and leads to a permeability reduction.

关键词： Shale gas Permeability Fracture Slippage Effective stress

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Lateral bearing characteristics of subsea wellhead assembly in the hydrate trial production engineering

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China Geology 2023年第3期6卷 455-465页

作者： Jing Zeng Wen-wei Xie Bei-bei Kou Jing-an Lu Xing-chen Li De-jun Cai Hao-xian Shi Ke-wei Zhang Hua-qing Liu Jin Li Bo Li Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China National Engineering Research Center of Gas Hydrate Exploration and Development China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China drilling Engineering division Offshore Engineering Company LimitedCNPCTianjin 300280China

Conductor and suction anchor are the key equipment providing bearing capacity in the field of deep-water drilling or offshore engineering,which have the advantages of high operation efficiency and short construction *** order to drill a horizontal well in the shallow hydrate reservoir in the deep water,the suction anchor wellhead assembly is employed to undertake the main vertical bearing capacity in the second round of hydrate trial production project,so as to reduce the conductor running depth and heighten the kick-off point ***,the deformation law of the deep-water suction anchor wellhead assembly under the moving load of the riser is not clear,and it is necessary to understand the lateral bearing characteristics to guide the design of its structural *** on 3D solid finite element method,the solid finite element model of the suction anchor wellhead assembly is *** the model,the seabed soil is divided into seven layers,the contact between the wellhead assembly and the soil is simulated,and the vertical load and bending moment are applied to the wellhead node to simulate the riser movement when working in the deep *** lateral bearing stability of conventional wellhead assembly and suction anchor wellhead assembly under the influence of wellhead load is *** analysis results show that the bending moment is the main factor affecting the lateral deformation of the wellhead string;the anti-bending performance from increasing the outer conductor diameter is better than that from increasing the conductor wall thickness;for the subsea wellhead,the suction anchor obviously improves the lateral bearing capacity and reduces the lateral *** conduct of the suction anchor wellhead assembly still needs to be lowered to a certain depth that below the maximum disturbed depth to ensure the lateral bearing stability,Thus,a method for the minimum conductor running depth for the suction anchor wellhead assembly is devel

关键词： Natural gas hydrate Deep-water Subsea wellhead Suction anchor Wellhead stability 3D solid finite element method Hydrate trial exploration engineering Natural gas hydrate trial production Shenhu area The South China Sea

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水力振荡器数值计算研究

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石油机械 2020年第3期48卷 19-29页

作者：郭慧娟 Guodong Zhan Timothy Eric Moellendick 明瑞卿中国石油集团工程技术研究院有限公司 drilling Technology division EXPEC Advanced Research Center

目前尚未开展水力振荡器在改变特定参数和参数间在某种最优配合条件下能否得以优化的研究,制约了该工具的进一步完善。针对该问题,利用SolidWorks软件对水力振荡器的各部分结构进行三维建模,在ICEM CFD中进行网格划分,将网格导入ANSYS ... 详细信息

目前尚未开展水力振荡器在改变特定参数和参数间在某种最优配合条件下能否得以优化的研究,制约了该工具的进一步完善。针对该问题,利用SolidWorks软件对水力振荡器的各部分结构进行三维建模,在ICEM CFD中进行网格划分,将网格导入ANSYS CFX进行数值计算与分析。研究结果表明:当流体通过水力振荡器时,旋转部件的运动使得流体动能增加,在流动过程中流体的动能重新转换为压能,使得该工具沿轴向正方向产生持续轴向力推动钻头做功;动静干涉作用和交界面速度变化所造成的流体震荡使得静止域产生剧烈的轴向和径向周期振动;大流量工况下轴向推力均值更大,轴向和径向振动也更为剧烈;在持续轴向推力和大幅度轴向振动推动下,该工具对钻柱施加周期性轴向振动和钻压并稳定推进。研究成果可为提高水力振荡器优化设计与敏感性分析水平提供相应的理论支撑。

关键词：水力振荡器流体力学振动减阻机械钻速数值计算

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