作　　者： ; ; ;

机构地区： 中国石油大学北京石油工程学院

出　　处： 《钻采工艺》 2007年第6期41-43,143,共3页

摘　　要： 在定向井的降斜井段井眼呈现上凸弯曲状态,位于其中的管柱受其约束必然存在上凸初弯曲。这就使管柱屈曲的性质和井眼轨迹为直线时管柱屈曲的性质就有很大的不同,有必要对其进行专门分析。为此,利用能量法对定向井的降斜段中存在上凸初弯曲管柱的屈曲问题进行了研究,推导出了其屈曲载荷的计算公式。研究表明在定向井的降斜井段,井身的上凸弯曲会造成管柱屈曲载荷的下降,弯曲的程度越大,管柱屈曲载荷下降的幅度越大。当井身上凸弯曲曲率达到一定程度时管柱有出现屈曲的可能性。 The pathways of drop-off interval in directional wells present upward bending,thus the pipe stem in it is bound to have initial upward bending because of the constraint which subjected to.This make the nature of buckling of pipe stem is more different to that when the pathway of inclined hole is straight,so it is necessary to analyze it specially.This paper analyses the buckling problem of pipe stem with initial upward bending in drop-off interval in directional wells by energy method,and the calculate formula of buckling load is derived.The research indicates that upward bending of pathways of well in drop-off interval in directional well will make the buckling load decrease,the bigger the degrees of the bending,the greater the amplitude of decrease of buckling load.When the upward winding curvature of pathways of well attain to a certain degree,the pipe stem has the possibility of buckling.

关 键 词： 定向井 降斜井段 上凸弯曲 管柱 屈曲载荷 分析计算

领　　域： [石油与天然气工程]