基于应变数值分析的稠油热采井套管优选
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摘要
针对目前稠油热采井常用的N80、N80H、T90H、TG80H 4种钢级套管的优选问题,首先通过蠕变试验建立了4种套管的蠕变本构模型,结合建立的套管-水泥环-地层全井筒平面有限元模型,获得280℃高温下套管柱应变随时间的变化规律,即随蒸汽吞吐轮次的增加,套管柱的变形不断增加,直至套管损坏。进一步经过多轮次蒸汽吞吐后,发现API标准的N80套管不适用稠油热采工况,其他三种套管对稠油热采井工况的适用性强弱为:N80H热采井优选套管提供依据。
Aiming at the optimum selection of the casing commonly used four grades of steel N80, N80 H, T90 H, TG80 H for thermal recovery wells, the relationship between casing stress and strain was established based on creep tests combining with the finite element model of wellbore casing-cement and stratum system. The relationship between casing strain and time in 280 ℃ was studied, the casing deformation increased with the number of steam increasing until the casing failed. After multi-cycle steam injections, the results showed that the API standard N80 casing was not applicable to the steam injection condition. The other three type casings on the applicability sort of the working condition of thermal recovery wells were: N80 H
Aiming at the optimum selection of the casing commonly used four grades of steel N80, N80 H, T90 H, TG80 H for thermal recovery wells, the relationship between casing stress and strain was established based on creep tests combining with the finite element model of wellbore casing-cement and stratum system. The relationship between casing strain and time in 280 ℃ was studied, the casing deformation increased with the number of steam increasing until the casing failed. After multi-cycle steam injections, the results showed that the API standard N80 casing was not applicable to the steam injection condition. The other three type casings on the applicability sort of the working condition of thermal recovery wells were: N80 H
引文
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[2] 李静,林承焰,杨少春,等.稠油开发井套管损坏机理与强度设计问题分析[J].石油矿场机械,2009,38(1):9-13.
[3] 宋治,冯耀荣.油井管与管柱技术及应用[M].北京:石油工业出版社,2007.
[4] 王兆会,马兆忠.热采井温度对套管性能的影响及预应力值计算方法[J].钢管,2007,36(4):24-27.
[5] 卢小庆,李勤,李春香.高强度稠油热采井专用套管TP110H的开发[J].钢管,2007,36(5):14-17.
[6] 宗卫兵,张传友,沈淑君,等.非API标准规格TP120TH稠油热采井专用套管的开发[J].天津冶金,2005(1):15-19.
[7] 韩礼红,谢斌,王航,等.稠油蒸汽吞吐热采井套管柱应变设计方法[J].钢管,2016,45(3):11-18.
[8] 王建军,杨尚谕,薛承文,等.稠油热采井套管柱应变设计方法[J].中国石油大学学报(自然科学版),2017,41(1):150-155.
[9] 机械工业理化检验人员技术培训和资格鉴定委员会编.力学性能试验[M].上海:上海科学普及出版社,2003:190.
[10] 张俊善.材料的高温变形与断裂[M].北京:科学出版社,2007:4.
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