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通过对环形钢板、简易套管头和正规套管头三种井口装置在使用过程中弊病的分析，华北油田研制成ST锁紧式套管头。该套管头由底法兰体、悬挂头总成和防护盖罩三部分组成，结构简单、操作方便、价格适中。经现场400多口井应用，认为该套管头能满足钻井、完井过程各种工艺的要求，提高井口安装的标准化程度，缩短建井周期，减轻工人劳动强度，提高工作效率，有较好的社会效益和经济效益。文中重点介绍了套管头的结构、工作原理、安装操作及推广应用情况。
Through the analysis of the shortcomings of the three wellhead devices of annular steel plate, simple casing head and regular casing head, the North China Oilfield developed the ST locking casing head. The casing head is composed of a bottom flange body, a suspension head assembly and a protective cover. The utility model has the advantages of simple structure, convenient operation and moderate price. The field application of more than 400 wells, that the casing head to meet the drilling, completion process of various processes to improve the standardization of wellhead installation, shorten the construction of wells, reduce labor intensity, improve work efficiency, better Social and economic benefits. The paper mainly introduces the structure, working principle, installation operation and popularization and application of casing head.