INVESTIGATION ON PRODUCTION CASING IN STEAM-INJECTION WELLS AND THE APPLICATION

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INVESTIGATION ON PRODUCTION CASING IN STEAM-INJECTION WELLS AND THE APPLICATION IN OILFIELD

The casing damage is a serious problem when the steam-injection method is applied in the oilfields.In this work,the commercial software ANSYS is used to predict the thermal expansion and the thermal stresses of casings in steam-injection wells under different conditions,including steam channeling,well shut-in and cavitation in cement ring.The results indicate that nearly no temperature change occurs in oil-layer areas 4.0 m-6.0 m away from the casing center.When steam channeling appears,the maximum Mises stress of both the casing and the cement ring occurs on the interior wall.During the shut-in operation,while the maximum thermal expansion ocurs within the temperature-transition area,the maximum thermal stress will be on the interior wall of casing,exceeding the thermo-elastic yield ultimate stress of N80 steel.Besides,the thermal stress is much higher than the elastic strain limit if certain amounts of cavitations appear in the cement ring.Based on the results,some preventive measures against casing damage are proposed,which are verified through the successful application of TP120TH casings during well completion in Liao'he oilfield.水利论文.A5e ah3z'Xh,~ Y,_V-Bt

作 者: YU Zhong-hong WANG Li-yang LIU Da-wei  
作者单位:YU Zhong-hong,WANG Li-yang(Division of Engineering Sciences,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)水利论文v APs"FM+B;y
LIU Da-wei(Technology and Development Department of Liao'he Oilfield Company,Panjin 124010,China) 
刊 名:水动力学研究与进展B辑  ISTIC EI
英文刊名:JOURNAL OF HYDRODYNAMICS 
年,卷(期):2009 21(1) 
分类号:TV1 
关键词:steam-injection well   stress field   numerical simulation   casing damage   field experiment  
机标关键词:APPLICATIONthermal expansionthermal stressinterior wallsteamtemperature changewell completionresultselastic strainduringapplicationsuccessfuloperationdifferentsoftwareyieldANSYSworkareaN80 
基金项目: 
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