发明公开
EP0960254A1 REVERSE CIRCULATION DRILLING SYSTEM WITH BIT LOCKED UNDERREAMER ARMS
失效
逆向循环钻井系统，带有位置锁定引导臂
- 专利标题： REVERSE CIRCULATION DRILLING SYSTEM WITH BIT LOCKED UNDERREAMER ARMS
- 专利标题（中）： 逆向循环钻井系统，带有位置锁定引导臂
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申请号： EP98906021.0申请日： 1998-01-28
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公开(公告)号： EP0960254A1公开(公告)日： 1999-12-01
- 发明人: Holte, Ardis L.
- 申请人： Holte, Ardis L.
- 申请人地址： 181 Polk Street Eugene, OR 97402 US
- 专利权人： Holte, Ardis L.
- 当前专利权人： Holte, Ardis L.
- 当前专利权人地址： 181 Polk Street Eugene, OR 97402 US
- 代理机构： Weatherald, Keith Baynes
- 优先权： US19970790066 19970128
- 国际公布： WO1998032945 19980730
- 主分类号： E21B10
- IPC分类号： E21B10 ; E21B4 ; E21B21
摘要：
A reverse circulation, pneumatic drilling assembly (10) wherein the bit assembly (11) is operatively connected to a dual wall pipe assembly (12). A supply of compressed air is conducted through the annulus of the dual wall pipe assembly (12) to a downhole pneumatic hammer (17). Exhaust air from the downhole pneumatic hammer is directed to the bit assembly (11) for continuous removal of drilling debris through a central evacuation tube of the dual wall pipe assembly (12).
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