发明名称 |
Improvements in or relating to drilling apparatus. |
摘要 |
<p>A drilling apparatus has a rotatable drilling rod (15) on the leading end of which is mounted a bit assembly including a bit (10) and a bit driver (12) for reciprocating the bit. The bit driver is powered by a high pressure fluid supplied from a fluid pressurising apparatus interposed between the rod and bit assembly and including a device (16,18 114) for raising the pressure of fluid in a closed circuit into which said bit driver is connected, the said device being driven from a power source remote from it for example, on the surface of the ground in which a hole is being drilled.</p> |
申请公布号 |
EP0210735(A2) |
申请公布日期 |
1987.02.04 |
申请号 |
EP19860304539 |
申请日期 |
1986.06.12 |
申请人 |
NYTOL ENTERPRISES LIMITED |
发明人 |
KNIGHT, ROBERT GEORGE;KLAT, SAMIR RAMEZ;UNWIN, KENNETH |
分类号 |
E21B4/14;E21B4/20;E21B7/00;E21B10/00;E21B36/00;(IPC1-7):E21B4/14;E02D7/28 |
主分类号 |
E21B4/14 |
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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