发明名称 |
Apparatus for controlling relative rotation of a drilling tool in a well bore |
摘要 |
An apparatus for controlling rotation of an outer sleeve member relative to an inner cylindrical duct member is used in a drilling system for controlling steering of a downhole drilling tool. The apparatus includes an annular swash plate pump and a stack of annular brake disks in the space between the members. The pump is driven by the rotation to pump fluid into a supply cylinder driving the brake. An orifice controls escape of the fluid from the chamber at a controlled rate. The rate is controlled to maintain a balance between the pumping rate and the brake pressure to keep the rotation at a required rate. The apparatus is used in the drilling system which includes a shallow bend in the drilling tool and a system for rotating the bent drilling tool slowly about a longitudinal axis of the drilling tool while the drill bit rotates more rapidly. The controlled orifice further allows the slow rotation to be halted at a predetermined orientation of the bend axis so as to effect a change in drilling direction.
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申请公布号 |
US6059050(A) |
申请公布日期 |
2000.05.09 |
申请号 |
US19980005596 |
申请日期 |
1998.01.09 |
申请人 |
SIDEKICK TOOLS INC. |
发明人 |
GRAY, BENJAMIN |
分类号 |
E21B7/06;(IPC1-7):E21B7/04 |
主分类号 |
E21B7/06 |
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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