ISO10400油管套管抗内压爆裂设计

Burst Design of Casing and Tubing String Using ISO10400

随着高温（150℃）、高压（100 MPa）、高含H2S（2%-70%）气井日益增多,该类气井中的油管、套管一旦爆裂失效,将会导致油套管串通,甚至含硫气体溢出地面,危害巨大。在油套管的设计中,尽管API 5C3给出了油管、套管的最小抗内压强度,但没有给出最大的爆裂失效强度,而准确预测出油管、套管的抗内压极限强度即爆裂强度是非常重要的。分析了ISO10400：2007标准,介绍了油管、套管抗内压爆裂计算模型,并用套管实测爆裂强度与该模型计算爆裂强度进行了对比。结果表明,该模型计算出的油管套管爆裂强度精度较高,能够较好地反映油管套管真实的抗内压强度,对改善油管套管设计具有一定的参考价值。

With the increase of gas wells with high pressure（100 MPa）,high temperature（150 ℃）,and high H2S content（2%～70%）,the burst of casing and tubing in these wells will cause the connection of casing and tubing,and the gas with H2S flow up to surface which causes damage.The API 5C3 provides the minimum compression strength for casing and tubing,while it did not give the maximum burst strength which is significant to casing design.This paper analyzes the ISO10400：2007 casing design standard and presents casing burst model.The comparison between the calculated and measured burst strength indicates that this model is good in calculating casing burst strength and can represent the actual burst strength,therefore it provides references to improve casing design.