It works with a special reaming tool that a reamer is after a pilot bit.As a result,the wellbore finally produced is larger than normal.It reams simultaneously while drilling.

• 该技术采用独特的扩眼工具、而用常规尺寸钻头作领眼钻头来获得比领眼钻头尺寸大的井眼，实现边钻边扩（即在全面钻进的同时形成比钻头直径大的井眼）。