发明名称 |
BI-DIRECTIONALLY RAISABLE DRILLING RIG MAST |
摘要 |
A substructure of a drilling rig is positioned above a first wellbore at a first wellbore location, a drilling rig mast is pivotably attached to the substructure and raised from a first mast position wherein an upper end of the drilling rig mast is oriented in a first direction toward a first side of the substructure to a first raised drilling position, after which a first drilling operation is performed on the first wellbore. The substructure is moved to a second wellbore location and positioned above a second wellbore, the drilling rig mast is pivotably attached to the substructure and raised from a second mast position wherein an upper end of the drilling rig mast is oriented in a second direction toward a second side of the substructure to a second raised drilling position, after which a second drilling operation is performed on the second wellbore. |
申请公布号 |
EP2841676(B1) |
申请公布日期 |
2016.11.30 |
申请号 |
EP20130721204 |
申请日期 |
2013.04.24 |
申请人 |
NATIONAL OILWELL VARCO, L.P. |
发明人 |
DONNALLY, ROBERT, BENJAMIN;REN, CHUNQIAO;LIU, XILIN |
分类号 |
E21B7/00;E21B7/02;E21B15/00 |
主分类号 |
E21B7/00 |
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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