发明申请
- 专利标题: DRILLING AND HOLE ENLARGEMENT DEVICE
- 专利标题(中): 钻孔和孔扩展装置
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申请号: US11669593申请日: 2007-01-31
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公开(公告)号: US20070163809A1公开(公告)日: 2007-07-19
- 发明人: Alexander Mackay , George Espiritu , Charles Dewey
- 申请人: Alexander Mackay , George Espiritu , Charles Dewey
- 申请人地址: US TX Houston 77032
- 专利权人: Smith International, Inc.
- 当前专利权人: Smith International, Inc.
- 当前专利权人地址: US TX Houston 77032
- 主分类号: E21B10/32
- IPC分类号: E21B10/32
摘要:
An expandable drilling apparatus includes a main body comprising a central bore and at least one axial recess configured to receive an arm assembly operable between a retracted position and an extended position, a biasing member to urge the arm assembly into the retracted position, a drive position configured to thrust the arm assembly into the extended position when in communication with drilling fluids in the central bore, a selector piston translatable between an open position and a closed position, wherein the selector piston is thrust into the open position when a pressure of the drilling fluids exceeds an activation value, wherein the drilling fluids are in communication with the drive piston when the selector piston is in the open position, and a selector spring configured to thrust the selector piston into the closed position when the pressure of the drilling fluids falls below a reset value.
公开/授权文献
- US07757787B2 Drilling and hole enlargement device 公开/授权日:2010-07-20