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石油钻井工程需用大量套管,而且这些套管永远埋在地下,只有一次使用价值。套管所用的资金约占整个钻井成本的三分之一。据统计,六十年代苏联用于钻采工程的无缝钢管,约70％作为套管使用。因此,节约套管是十分重要和有意义的。目前我国在这方面还有潜力可挖,个别地区至今仍沿用苏联五十年代萨尔基索夫挤压公式来计算套管。实践证明其对管材抗挤强度计算值比实际值低50％以上。美国API标准中所用公式是比较适合于工程设计的经验公式,但进行二向应力的精确计算,工作量大,在现场采用手算有一定的困难。若仅进行粗略计算,误差可达20～30％。
Oil drilling projects require a large number of casing, and these casing buried in the ground forever, only once the use value. The cost of casing is about one-third of the cost of drilling. According to statistics, about 70% of the seamless steel pipe used by the Soviet Union for drilling engineering in the 1960s was used as a casing. Therefore, saving casing is very important and meaningful. At present, China still has the potential to dig in this area. In some areas, the casing is still calculated according to the Sulkisson squeeze formula in the 1950s. Practice has proved that the calculated value of the pipe extrusion crush more than the actual value of more than 50%. The formula used in the American API standard is more suitable for engineering design experience formula, but accurate calculation of two-way stress, heavy workload, there are some difficulties in using the hand in the field. If only rough calculation, the error of up to 20 to 30%.