Control Model of Throttle Back Pressure of Managed Pressure Drilling

This paper established a controlling model of Throttling Back Pressure system of Managed Pressure Drilling (MPD), and aim at its nonlinear characteristics of the model, a fuzzy-PID controlling method with a capability of parameter self-tuning was proposed. This method utilizes the idea of fuzzy controlling and designs a fuzzy inference theory to realize the function of online tuning PID control parameters. Through comparing this controlling algorithm with conventional controlling algorithms and analyzing, results showed that overshoot of this throttling back pressure controlling system using fuzzy-PID controlling method with a capability of parameter self-tuning reduced to 4.1%, and its dynamic response speed reduced to 1.4 s, which can effectively solve back pressure controlling model problems such as slow response and poor robustness during MPD using conventional controlling algorithms.