ROTARY STEERABLE ROLL STABILIZED CONTROL SYSTEM

摘要

A rotary controlled system includes first and second alternators electrically connected to one another via a DC voltage bus. The alternators may optionally be further mechanically connected to one another via corresponding rotationally coupled components (such as rotationally coupled stators). A first field oriented controller is electrically connected with the first alternator and configured to cause the first alternator to provide a constant DC voltage to the voltage bus. A second field oriented controller is electrically connected with the second alternator and configured to receive electrical power from the voltage bus and cause the second alternator to provide servo angular position control of the rotationally coupled components. The system may be employed in a downhole rotary steerable tool to provide servo angular position control of a roll stabilized housing.

主权项

1. A downhole tool comprising:
a downhole tool collar configured for coupling with a drill string such that the tool collar rotates with the drill string; a roll stabilized housing deployed in and rotationally decoupled from the tool collar; and an electronic controller deployed in the roll stabilized housing, the electronic controller including first and second field oriented controllers, the first field oriented controller configured to provide a constant DC voltage to a voltage bus, the second field oriented controller configured to receive power from the voltage bus and provide servo angular position control for the roll stabilized housing.