Reinforced mechanical properties and mechanism of well-cementing stones by brucite fiber
Author(s): Li Ming, Yang Yujia, Jin Jianzhou, Yu Yongjin, Guo Xiaoyang, School of Material Science and Engineering, Southwest Petroleum University, State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation// Southwest Petroleum University, Cementing & Completion Division, CNPC Drilling Research Institute
Pages: 82-86
Year: 2015 Issue: 6
Journal: Natural Gas Industry
Keyword: Oil well cet cement; Brucite fiber; Mechanical property; Elastic modulus; Well cementing;
Abstract: Micro-fractures generated by brittle ruptures in well-cementing stones may destroy the integrity of the cement sheath,and accordingly,the enhancement of properties of well-cementing stones from the aspects of cement materials has been a hot topic for researches related to cementation technologies around the globe.This paper reviewed the impacts of brucite fibers on tensile strength,compressive strength and flexural strength of set cements.Tri-axial stress-strain tests of well-cementing stones reinforced by brucite fiber were conducted in simulated downhole environments.In addition,scanning electron microscope(SEM) was deployed to determine the micro structures of well-cementing stones reinforced by brucite fiber and further to probe the mechanisms related to such reinforcement.Test results show that:(l)application of brucite fiber with suitable proportions can generate cement slurries with satisfactory performances)(2)after curing for 28 days,the mechanical properties of well-cementing stones with 5.0%(mass fraction)brucite fiber are enhanced significantly with compressive,flexible and splitting tensile strengths increased by 15.3%,32.2%and32.8%,respectively,while the modulus of elasticity of well-cementing stones reduces by 34.5%than pure cement;(3) with outstanding hydrophilic properties,brucite fiber may generate 3D network structures in a disordered manner in well-cementing stones.Through actions of energy consumption for removal and bridging,these structures can effectively control generation and development of micro-fractures.In this way,mechanical properties of oil well cement can be enhanced dramatically.
Pages: 82-86
Year: 2015 Issue: 6
Journal: Natural Gas Industry
Keyword: Oil well cet cement; Brucite fiber; Mechanical property; Elastic modulus; Well cementing;
Abstract: Micro-fractures generated by brittle ruptures in well-cementing stones may destroy the integrity of the cement sheath,and accordingly,the enhancement of properties of well-cementing stones from the aspects of cement materials has been a hot topic for researches related to cementation technologies around the globe.This paper reviewed the impacts of brucite fibers on tensile strength,compressive strength and flexural strength of set cements.Tri-axial stress-strain tests of well-cementing stones reinforced by brucite fiber were conducted in simulated downhole environments.In addition,scanning electron microscope(SEM) was deployed to determine the micro structures of well-cementing stones reinforced by brucite fiber and further to probe the mechanisms related to such reinforcement.Test results show that:(l)application of brucite fiber with suitable proportions can generate cement slurries with satisfactory performances)(2)after curing for 28 days,the mechanical properties of well-cementing stones with 5.0%(mass fraction)brucite fiber are enhanced significantly with compressive,flexible and splitting tensile strengths increased by 15.3%,32.2%and32.8%,respectively,while the modulus of elasticity of well-cementing stones reduces by 34.5%than pure cement;(3) with outstanding hydrophilic properties,brucite fiber may generate 3D network structures in a disordered manner in well-cementing stones.Through actions of energy consumption for removal and bridging,these structures can effectively control generation and development of micro-fractures.In this way,mechanical properties of oil well cement can be enhanced dramatically.
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