套管“最大载荷”设计,是套管既能承受拉伸、内压和外挤三种载荷的全部最大载荷,同时成本又最低,所以是既安全又经济的设计原则。本文讨论了美国、西德及我国有关最大载荷的确立和计算方法,提出我国有关套管“最大载荷”设计的建议。 The “maximum load” design of the casing is a safe and economical design principle because the casing can bear all the maximum loads of the three loads of tensioning, internal pressure and external crowding with the lowest cost. This article discusses the establishment and calculation of the maximum load in the United States, West Germany and China, and puts forward some suggestions on the design of “maximum load” of casing in our country.