Notice of RetractionKey technology research of downward communication receiving system in rotary steerable drilling

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

The downward communication receiving system in rotary steerable is a hot research topic today. Several key technologies for its implementation, namely, transmission channel, the ground command code, underground detection devices, and underground instruction decoding were studied in this paper. After comprehensive drilling technology, command transmission time, underground communication recognition accuracy, etc., the drilling fluid pulse transmission is selected as a downlink information transmission protocol. The relationship between three-descending and three-ascending coded instructions and the points with tool face angle and the guidance force size is established. A code table has been established with four coding classes. In order to convert drilling fluid pulses into electric pulses, the use of downhole turbine engine is proposed as means to detect the changes in drilling fluid displacement. Ground simulation and hydraulic tests through the turbine engine showed the existence of a linear response relationship between the output voltage from the turbine motor and the drilling fluid displacement. The identification of descending edge and ascending edge is achieved by using interruption mode. Five-pulse widths were calculated by using pulse-counting method. The corresponding control commands were interpreted through the development of the software in the downhole drilling tool. Ground simulation results demonstrated the feasibility and achievability of this downward transmission and receiving scheme.