多胀头膨胀天然气井套管修复载荷估算
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摘要
天然气井套管在地震载荷作用下发生变形,无法进行正常生产。采用特殊的技术使膨胀头下到变形位置后,在外力作用下,对套管膨胀,使其恢复到原来的形状尺寸。使用设计软件CATIA建立了天然气套管和膨胀头的模型,并生成装配模型。在有限元软件ABAQUS内分析了膨胀变形套管需要的载荷,分析中考虑了材料的塑性变形,采用两个膨胀头多套管进行两次膨胀,使总的膨胀载荷降低。计算表明,当套管承受10MPa外压时,第一膨胀头需要的载荷为14418N,第二膨胀头需要的载荷为155744N。当不考虑套管的外压时,第一膨胀头需要的载荷为10751N,第二膨胀头需要的载荷为100480N。
Casing pipe of natural gas well deformed due to the earthquake load during Sichuan earthquake.The well could not be used to produce natural gas any more.Special technique was used to set swell head down to the deformation area.Under the expansion load of swell head,the casing pipe restore to original dimension.The casing pipe and swell head model were constructed and assembled together in design software CATIA.The expansion load of casing pipe was calculated in finite element software ABAQUS,with material plastic deformation considered.The result showed that the load for the first swell head was 14418N,while 155744N for the second swell head,when the external pressure on the casing pipe was 10MPa.The load for the first swell head was 10751N,while 100480N for the second swell head,when the external pressure on the casing pipe was neglected.
Casing pipe of natural gas well deformed due to the earthquake load during Sichuan earthquake.The well could not be used to produce natural gas any more.Special technique was used to set swell head down to the deformation area.Under the expansion load of swell head,the casing pipe restore to original dimension.The casing pipe and swell head model were constructed and assembled together in design software CATIA.The expansion load of casing pipe was calculated in finite element software ABAQUS,with material plastic deformation considered.The result showed that the load for the first swell head was 14418N,while 155744N for the second swell head,when the external pressure on the casing pipe was 10MPa.The load for the first swell head was 10751N,while 100480N for the second swell head,when the external pressure on the casing pipe was neglected.
引文
[1]大港油田科技丛书编委会.试油与油井大修[M].北京:石油工业出版社,1999:174-178.
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[3]张志友,周云璋,杨华,等.套管整形修复技术研究及应用[J].油气井测试,2001,10(4):51-53.
[4]李森茂,吴德强.油井变形套管的爆炸整形[J].石油矿场机械,2001(5):44-45.
[5]盛选禹.CATIA曲线和曲面功能详解[M].北京:机械工业出版社,2004.
[2]卞小强.非均匀载荷作用下套管挤压强度有限元分析[J].重庆石油高等专科学校学报,2004,6(4):33-34.
[3]张志友,周云璋,杨华,等.套管整形修复技术研究及应用[J].油气井测试,2001,10(4):51-53.
[4]李森茂,吴德强.油井变形套管的爆炸整形[J].石油矿场机械,2001(5):44-45.
[5]盛选禹.CATIA曲线和曲面功能详解[M].北京:机械工业出版社,2004.
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