发明名称 |
Top drive well drilling apparatus |
摘要 |
Well drilling apparatus including a powered drilling unit connectable to the upper end of a drill string and adapted to rotate it to drill a well, and a vertically extending guide track structure which guides the drilling unit for movement along the axis of the well, with a portion of the guide track structure being mounted for swinging movement between a drilling position in which the drilling unit is aligned with the axis of the well and a slightly inclined position in which the track structure guides the drilling unit for movement along an inclined axis in alignment with a mousehole, and with the drilling unit also preferably being mounted for movement to a laterally retracted position at a side of the well in which it leaves an area along the axis of the well unobstructed for use of conventional hoisting equipment in making a 'round trip' of the drill string out of and then back into the well.
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申请公布号 |
US4458768(A) |
申请公布日期 |
1984.07.10 |
申请号 |
US19820404638 |
申请日期 |
1982.08.02 |
申请人 |
VARCO INTERNATIONAL, INC. |
发明人 |
BOYADJIEFF, GEORGE I. |
分类号 |
E21B3/02;E21B15/00;E21B19/02;E21B19/14;(IPC1-7):E21B19/00 |
主分类号 |
E21B3/02 |
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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