非均匀外载作用下油井套管强度特性的实验研究  

Laboratory study of casing strength under nonuniform load

作　　者：邓金根[1] 田红[1] 王治中[1] 周建良[2] 

机构地区：[1]中国石油大学石油天然气工程学院,北京102249 [2]中国海洋石油总公司研究中心,北京100027

出　　处：《岩土力学》2005年第6期855-858,共4页Rock and Soil Mechanics

基　　金：国家自然基金重点项目(项目号:50434050)

摘　　要：盐膏层套管损坏是由于盐岩蠕变对套管产生一个严重的非均匀附加外挤力而造成的,目前,国内外仍没有一套成熟的非均匀外载作用下的套管强度设计方法。根据实际全尺寸套管承受非均匀外载作用下的强度实验,研究了非均匀外载作用下油井套管的强度特性,提出了用“等效破坏载荷”及椭圆载荷的短、长轴之比来定量描述套管所受非均匀外载的概论,建立了非均匀外载下的套管强度设计图版,可用来检测盐岩等流变地层中下入套管的安全性或在已知套管外载时进行套管强度设计。实验结果表明:套管承受非均匀外载作用时其强度与承受均匀外压相比要低8～21倍。Most of the casing failure in salt bed are due to the nonuniform additional collapse load caused by salt creep. But there are still no any comprehensive strength design methods for casing under nonuniform load. Based on the full-scale casing strength test under nonuniform load, this paper analyzes the strength characteristics of the casing under nonuniform load and suggests that the equivalent failure load and the ratio of minor axis and major axis can be used to quantitatively describe the nonuniform load. The casing strength design charts presented by this paper can be used to check the safety of the casing in salt bed or help perform casing strength design when the load is known. The experiment results demonstrated that the strength of the casing under nonuniform load is 8 to 21 times lower than that under uniform load.

关 键 词：油井套管 非均匀外载 强度设计 实验 

分 类 号：TE92[石油与天然气工程—石油机械设备]