套管外补贴工艺实践认识

Practice and Understanding about Technology of Patching Outside Casing

套管外补贴工艺从井内原套管柱外部进行回接和密封,不损失原套管串的内径,对后续作业不造成影响;同时不同尺寸和压力等级的补贴器,可以满足不同井身结构、不同钻井平台的需要。文章通过对套管外补贴工艺与特点的介绍及对套管外补贴工艺实施步骤的阐述,提供了今后类似套管复杂情况处理的借鉴和参考。通过对南海西部两个应用实例的介绍,表明套管外补贴工艺能够有效的解决套管下不到位或井口故障等问题。

The technology of patching outside casing is conducted through tie-back and seal from the original casing externally, without losing the original inside diameter of the casing, without any disadvantage influence on the follow-up drilling operation. Mean-while, the casing patch tools with different sizes and pressure can meet the requirements for different casing program and drilling platform. In this article, an introduction has been given on the characteristic of technology for patching outside casing, the process and implementation steps of the tie-back outside casing, which can provide references for dealing with similar casing processing in the future. In addition, two application examples in the western part of South China Sea have been given in this paper, and the application results indicated that technology of patching outside casing can be used effectively to solve the problems when casing is not in place or well-head equipment has troubles.