Research on the bidirectional transmission system of wireless energy and signals in the steering system of orienter in coiled tubing drilling

Steering system of orienter in coiled tubing drilling (SSCTD) is currently one of the key devices in downhole exploration to improve drilling speed and enhance control accuracy. To replace traditional wired cable connections and enable bidirectional wireless transmission of both power and signals between a rotating shaft and a stationary housing, a method for simultaneous transmission of power and signals based on the principle of magnetic inductive coupling was proposed. Based on the power transmission channel, signal transceiver circuits are integrated to enable the simultaneous transmission of power and signals through a shared physical medium, thereby reducing wiring costs. By analyzing the advantages of the inductor–capacitor–inductor (LCL) compensation topology in harmonic suppression and system stability enhancement, a bidirectional LCL resonant compensation model for integrated power and signal transmission was developed on the Simulink platform. A combined active and reactive power (P&Q) control strategy is implemented. By measuring the active power (P) and reactive power (Q) at the resonant network, the power flow on both sides can be regulated and synchronized without the need for dedicated communication interfaces for power transfer control. Simulation and experimental results demonstrate that the power and signal co-transmission system achieves a transmission efficiency of 95.16 %. The introduction of the signal channel results in a negligible impact on power transfer, with losses below 3W. The system exhibits excellent dynamic response and power stability.