斜直井钻柱螺旋屈曲时轴向力钻速和井斜角间的关系  

Relationships Among the Axis Critical Force,the Speed of the Drill String and Deviation Angle with Helical Buckling in Slant Well

作　　者：刘殿福[1] 林元华[1] 甘燕芬[2] 祝杨 薛峰 

机构地区：[1]西南石油大学石油管力学和环境行为重点实验室,成都610500 [2]西南石油大学研究生院,成都610500 [3]中石化管道储运公司华东管道设计研究院,江苏徐州221000 [4]中石油天然气管道工程有限公司,天津300000

出　　处：《石油矿场机械》2007年第12期30-33,共4页Oil Field Equipment

摘　　要：通过考虑重力、转速和井斜角对钻柱屈曲的影响,利用能量方法研究了斜直井中轴向载荷、重力和离心力共同作用下钻柱的螺旋屈曲问题,着重研究了重力的轴向分力、转速和井斜角对钻柱屈曲的影响,推导了钻速、井斜角和轴向力间的数学关系表达式。理论分析表明,在相同条件下钻柱螺旋屈曲临界载荷随井斜角增大而增大,且呈非线性;临界载荷随转速增大而减小,且井斜角较大时减小幅度较大;钻柱重力线密度对临界载荷的影响大小与井斜角和屈曲模态有关。The usually used buckling criterion of drill sting is Lubinski＇s axis critical force when investigating the buckling of drill sting in deep well. However, this criterion is obtained in studying the buckling of drill sting at static state. In engineering, the drill sting will be affected by factors. As a result, there are defects in this criterion. Consequently, this paper investigates the relationship between the axis force of gravity force under helical buckling, centrifugal force and deviation angle. The energy method is employed to study the bulking load of drill-pipes under centrifugal force and the axis force of gravity force in slant well. The emphasis is placed upon the influence of the axis force of gravity force, centrifugal force and deviation angle on the bulking load. Considering the inertial eccentric force, deviation angle and the axis force of gravity force, under the same conditions the helical buckling load increases nonlinearly with the increase of the well deviation angle. Rotation speed can reduce the helical buckling load, and the degree of reduction increases with the increase of deviation angle. The effect of the tubing weight per unit length on the buckling load varies with the deviation angles and buckling mode.

关 键 词：斜直井 螺旋屈曲 钻柱 钻速 轴向力 

分 类 号：TE921.2[石油与天然气工程—石油机械设备]