Stable Platform Research on Control Method of Fully Rotary Steerable Drilling Tool

Rotary steering drilling is a drilling technique in which the bit's drilling path is controlled by an electronic control device (steering tool) located near the bit as the drill column rotates. The guidance tool's center is the stability control platform, which plays a critical role in guidance control. The effect of eccentric action torque on platform motion is studied using the simulation method, and the PID control method is proposed to resolve the problem that large-scale variation of drilling fluid flow affects the control efficiency of the platform. A feed-forward compensation method for turbine motor voltage is proposed to address the problem that PID control can only achieve stable control in a narrow flow range. The digital analog hybrid device structure is built to realize the power, and the signal operation circuit of voltage feed-forward control is designed and realized, according to the concept of voltage feed-forward angle feedback control process. The circuit's test results show that its signal operation accuracy meets control criteria, and its temperature characteristics meet the needs of underground workers.