可循环盲板在漏失井固井中的应用

详细介绍了一种新型固井用井下工具——可循环盲板的结构、工作原理及其在漏失井筛管固井中的成功应用。应用效果表明，漏失井固井时，把普通盲板换成可循环式盲板，能实现下套管过程中自动灌浆，让部分钻井液流入到套管内，减小了环空流体上返速度，从而降低了流体对地层的流动压力，达到了降低井漏发生几率、提高固井质量的目的。

The Application of Circulating Blind Pipe in Cementing Lost Well

This paper introduces a new cementing tool named circulating blind pipe, and it's mechanical structure, operation principle and successful applications while cementing a liner in a lost well. Application results show that substituting circulating blind pipe for normal blind pipe can realize automatic filling cement slurry while running casing strings in a lost well, which allow part of drilling fluid into casing strings, and thus reduces the annular velocity and additional circulating pressure exerting on formations. Therefore, the tool is help to reduce down hole trouble probability and improve cementing qualities.