本煤层空气反循环钻进技术先导性研究

 本文介绍了本煤层空气反循环形成机理，将人造龙卷风控制抽吸及反螺旋密封技术引入到钻头的结构设计中，研制出两种专用钻头及孔底钻具组合，通过工业性试验，得出了本煤层适用空气反循环技术的初步结论，并提出下一步改进建议。

The Coal Bed Air Reverse-Circulation Drilling Technology Pilot Research

This article analyzes mechanism of coal bed air reverse circulation and applies man-made tornado and inverse spiral sealing technique into the structure design of the bit .It have developed two type of special bit and BHA. After industrial test, primary conclusion has been drawn that air reverse circulation is suitable for coal bed drilling, and pointed out suggestion for the next stage.