摘要
从公式的理论推导和与双向应力椭圆理论对比两个方面都可以证明,SY/T 5322-2000套管柱强度设计方法和SY/T 5724-2008套管柱结构与强度设计中给出的三轴抗拉强度计算公式是错误的,错在把根号内的'-'号写成了'+'号,其另一个与三轴应力抗拉强度公式有关的错误是轴向力计算方法不正确。在套管柱组合强度设计中正确区别和应用真实轴向力和有效轴向力极其重要,当采用三轴应力强度理论时,只能使用压力面积法计算的真实轴向力,而两个标准中使用浮力系数法计算的有效轴向力,从而导致了混乱,出现错误。
The formula of calculation tri-axial tension strength of casing string given by SY/T5322-2000 design method of casing string strength and SY/T 5724-2008 structure and strength design of casing string is incorrect,which has a plus sign ＂＋＂ instead of minus sign ＂-＂ in the radical of it.This conclusion can be obtained by theoretical derivation and comparing with the theory of two-axial stress ellipse.Another mistake is that the method of calculating axial force is incorrect.It is very important that two kinds of axial forces of actual axial force and effective axial force must be correctly distinguished and used in the combinational strength design of casing string.The actual axial force calculated by pressure-area method must be used when tri-axial stress strength theory is used to the combinational strength design of casing string,but the effective axial force is calculated by buoyancy-factor method in the two standards,so that the confusion and mistake are made.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第4期77-80,共4页
Journal of China University of Petroleum(Edition of Natural Science)
关键词
套管柱强度设计
三轴应力强度
压力面积法
浮力系数法
真实轴向力
有效轴向力
casing string strength design
tri-axial stress strength
pressure-area method
buoyancy-factor method
actual axial force
effective axial force
