专利名称：Steerable rotary drilling system发明人：Barr, John D.,Motion, William C.,Russell,
Michael K.
申请号：EP96300970.9申请日：19960213公开号：EP0728908B1公开日：20000816
摘要：A system for controlling the rotation of a roll stabilisable control unit in asteerable rotary drilling assembly comprises an instrument carrier (24) rotatablymounted on a support (23) connected to the drill string. A first rotatable impeller (28) ismounted for rotation by a flow of drilling fluid over the impeller and is coupled to theinstrument carrier (24) so as to transmit a torque to it. Sensors (27) carried by theinstrument carrier sense the rotational orientation of the instrument carrier and producea control signal indicative of its rotational orientation, and the torque applied to theinstrument carrier by the impeller (28) is controlled, at least partly in response to saidsignal, so that the instrument carrier can, for example, be roll stabilised if required. Asecond rotatable impeller (38) is coupled to the instrument carrier for transmitting to it asecond torque, which may also be controlled, in the opposite direction to the torquetransmitted by the first impeller (28). The provision of two opposed impellers allows therotation of the control unit to be controlled over a greater range than is possible with asingle impeller.
申请人：CAMCO DRILLING GROUP LTD
地址：GB
国籍：GB
代理机构：Carter, Gerald
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