发明名称 |
Drill string fitting with rotatable mounts on body exterior housing rollers that can rotate so as to reduce friction in axial and transverse directions |
摘要 |
A fitting is disclosed for reducing friction between a drilling string and the wall of a well. The fitting is provided on a drill string having rotatable roller means (21) which can rotate about a point of rotation (23) so as to minimise both axial and rotational friction. |
申请公布号 |
NZ335944(A) |
申请公布日期 |
2000.09.29 |
申请号 |
NZ19960335944 |
申请日期 |
1996.04.26 |
申请人 |
WEATHERFORD U S , LP |
发明人 |
MURRAY, GEOFFREY NEIL;FERNANDES, DENIS ROBERT |
分类号 |
E21B17/00;E21B17/10 |
主分类号 |
E21B17/00 |
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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