套管和尾管快速下入工艺在深水钻井中的应用

套管和尾管的下入程序是整个钻井工艺的重要环节。传统的下套管和尾管速度往往较慢且需要周期性地向管柱内灌钻井液。特别是对于深水钻井等钻井液密度窗口较窄的井,掌控套管柱合适的下放速度较困难,极易产生压力"激动"造成井漏。套管和尾管的快速下入工艺是提高作业效率,保证井下安全,满足钻井工艺需要的重要研究方向。本文主要介绍了套管和尾管快速下入工艺技术的主要工作原理、特点、工具组成和操作方法,以及现场应用情况及其注意事项,对作业过程中可能出现的一些问题进行了分析和总结,并提出了相应的建议,对类似的深水井作业具有重要的借鉴意义。

Application of Casing and Liner Fast Running Technology in Deepwater Drilling

Casing and liner running process is an important part of the whole drilling process. The traditional casing and liner running had to be slow and drilling fluid should be periodically grouted into pipe string; Especially for deepwater well and those wells with narrow density window of drilling fluid, it is difficult to control the suitable pipe string lowering speed and circulation loss is extremely easily caused by surge pressure. Casing and liner fast running technology is being studied to improve operation efficiency, ensure downhole safety and satisfy the requirements of drilling process. This paper introduces casing and liner fast running technology about its main principles, characteristics, tools and operation method, as well as the field application and some attentions, analyzes and summarizes some difficulties which might occur in operation and puts forward corresponding suggestions, which can be reference to the similar deepwater well drilling operation.