Patent ID: 11946350
Assignee: CHINA NATIONAL PETROLEUM CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 6:
7. The method for remotely shutting down the downhole unit of the rotary steering system from the ground, as recited in claim 2, wherein in the step e, shutting down the downhole unit comprises specific steps of: since the rotary steering system comprises a downhole mud turbine generator and a voltage frequency changes accordingly when a mud flow through the downhole mud turbine generator changes, detecting a voltage frequency change by a rotary steering control module, so as to obtain a mud flow change; detecting a size of the diverting flow downhole and combining with an inherent coding method to complete identification of a downlink command; after receiving a shutdown command, setting a controllable diode of a corresponding function block to a cut-off state.