FIELD: gas and oil production.
SUBSTANCE: here is disclosed controlled rotor tool installed in downhole drilling device for correction of drilling direction. Also, the controlled rotor tool consists of a tubular external case, and of at least one controlled pusher movably secured on the case. The pusher travels between an extended position, whereat the controlled pusher touches a well wall formed with the drilling device, and a retracted position, whereat the controlled pusher does not contact the wall of the well. Further, the controlled rotor tool consists of a tubular shaft mounted inside the case and connected to a drill string on its first and second ends. The shaft transfers torque to a bore bit and also forms a channel for flow of drill agent to the bore bit. The controlled rotor tool comprises a pressure chamber formed between the shaft and the case and connected at least with one of the above said controlled pusher to transfer the controlled pusher from the retracted position into the extended one, and a piston movably installed in the tubular shaft. By means of preliminary specified changes of drilling agent pressure, the piston travels between the first axial position and the second axial position. In the first axial position internal section of the shaft is connected directly with the pressure chamber, which causes transfer of at least one above said controlled pusher into the extended position for contact with the wall of the well and corrects the direction of the drilling device. In the second axial position the internal section of the shaft is not connected directly with the pressure chamber to prevent transfer of one or each said controlled pusher into the extended position.
EFFECT: reliable operation of device at high pressure of drilling agent.
27 cl, 15 dwg
