发明名称 |
METHOD OF DRILLING A BOREHOLE |
摘要 |
The present invention provides a method of drilling a borehole in a formation (i.e. open-hole drilling). The method uses a drill bit that has at least one blade (14) that is movable between an extended configuration and a retracted configuration. The blade is movable by increased fluid pressure applied to the drill bit. The invention also provides a drill bit that is provided with at least one blade that can be moved between an extended configuration and a retracted configuration. The drill bit is provided with a locking means that prevents the blade from partially or fully extending until required.
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申请公布号 |
WO0129363(A1) |
申请公布日期 |
2001.04.26 |
申请号 |
WO2000GB03961 |
申请日期 |
2000.10.16 |
申请人 |
PSL TECHNOLOGY LIMITED;REBECCA, RICHARD |
发明人 |
REBECCA, RICHARD |
分类号 |
E21B10/32;(IPC1-7):E21B10/32 |
主分类号 |
E21B10/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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