高压气井井口的改制四川地区在高压气井施工中使用套管头较好地解决了多层套管之间的连接问题，同时为处理施工中出现的复杂情况提供了便利条件。但对于异常高压的气井（井口压力大于５０ＭＰａ），现有套管头的主、副密封经使用实践证明难以满足完井后长期试采的要求，多... The reform of high pressure gas wellhead In Sichuan, the use of casing head in high pressure gas well well solves the problem of multi-layer casing connection, and provides the convenient conditions for handling the complex situation in construction. However, for the abnormally high pressure gas well (wellhead pressure greater than 50MPa), the main and secondary seals of the existing casing heads have proved difficult to meet the requirements of long-term test production after completion and more ...