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Numerical analyses of coupled thermo-mechanical behaviors of cement sheath in geothermal wells

Underground Space 2023年第1期8卷 80-93页

作者： Hao Wang Jinlin Wang Zhichao Zhang Xiaohui Cheng State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China School of Civil Engineering Chongqing UniversityChongqing 400045China Department of Civil Engineering Tsinghua UniversityBeijing 10084China

The stability of cement sheath under high temperature and high pressure is one of the most critical issues for the durability of geother-mal well *** this study,a two-dimensional plane-strain finite element code was developed to investigate the coupled thermo-mechanical behaviors of the casing-cement-formation *** from previous linear elastic analyses,a thermoelasto-plastic con-stitutive model based on the thermodynamic theory was adopted for the cement *** is shown that the finite element simulations using the proposed model provide a more accurate and realistic prediction of stress–strain responses of the cement sheath under high *** results demonstrate that the radial stress concentration and the tensile strain concentration occur at both the cement–casing interface and the cement–formation interface,where the cement sheath is most likely to *** strength and low stiff-ness in the cement sheath and the formation are preferred for the integrity of the *** large thermal cycles and large differences between the internal fluid pressure and the external pressure should be avoided during *** new code is an alternative tool for guiding the geothermal well *** finite element framework described herein is universal for other thermo-mechanical applications,such as energy foundations and energy tunnels.

关键词： geothermal well Thermal-mechanical coupling Finite element analysis Constitutive model Cement sheath Thermodynamic theory

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Numerical simulation of operation performance on production and injection of a double well geothermal system in Kailu Basin, Inner Mongolia

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Journal of Groundwater Science and Engineering 2022年第2期10卷 196-208页

作者： Yu-kun Sun Feng Liu Huajun Wang Xin-zhi Gao School of Energy and Environment Engineering Hebei University of TechnologyTianjin 300401China Institute of Hydrogeology and Environment Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Technology Innovation Center of geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China Tianjin geothermal Exploration and Design Institute Tianjin 300250China

Inner Mongolia is abundant in geothermal resources,but the development and utilization of medium-depth geothermal resources for clean heating in winter is still in the preliminary stage compared with the neighboring *** this paper,a recently developed geothermal heating system using the Mesozoic sandstone reservoirs in Baokang of Kailu Basin,Eastern Inner Mongolia was investigated,a threedimensional geological model of a pair of production and injection well was established,and numerical simulations on the long term operation performance were conducted and verified by pumping test and water level recovery test *** effects of flow rates,the direction of wells,injection temperature and ratios on the flow field and water level in the thermal reservoir were *** results show that considering a 30-year operation period and a production rate from 90 m^(3)/h to 110 m^(3)/h,the optimum well spacing can be increased from 225 m to 245 m,with an average value of 235 *** the decrease of the injection temperature,the cold front of the injection water has an increasing influence on the temperature in the production well.A complete injection or the principle of production according to injection is recommended in order to maintain the long-term operation *** addition,the location of the injection well should be arranged in the downstream of the natural flow *** present results can provide a useful guide for the optimum design and performance prediction of geothermal wells,thus maintaining the production and injection balance and promoting the sustainable development and utilization of medium-depth and deep geothermal resources.

关键词： geothermal well Optimum well spacing Production and injection Numerical simulation Heat breakthrough

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Analysis of geological conditions and thermal reservoir characteristics of Guantao Formation in new coastal region

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Global Geology 2013年第4期16卷 201-206页

作者： JIANG Guosheng HUANG Xianlong HU Liangjun ZHANG Liandi LIU Zan LU Bao Tianjin geothermal Exploration and Development-Designing Institute Chunquan well Technoligical Development Company of Limited Liability in Tianjin

geothermal resources is one of the most practical and competitive new energy at present,and there is abundant geothermal resources in the new coastal *** article get the three following conclusion through the geothermal geological condition by the drilling strata and the condition of the reducing test:stratigraphic division is done by the analysis of formation lithology and the drilling aging;the water yield is higher than 100m3/h,the flow temperature is 67℃--71℃;the average geothermal gradient of the overlying strata is 3.08℃--3.33℃/100 m.

关键词： the new coastal region geothermal well Guantao Formation drilling time aging

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