Scrutinizing the influence of an adaptive fuzzy sliding mode control strategy on the regulation of constant BHP control

This study introduces a fuzzy robust controller that controls the constant bottom-hole pressure during the implementation of the managed pressure drilling approach by employing linear matrix inequalities. Maintaining constant bottom-hole pressure during drilling operations is crucial for ensuring well-bore stability, preventing kicks and blowouts, optimizing drilling performance, minimizing formation damage, and improving data acquisition accuracy. To achieve dependable performance, nonlinear controllers often consider the accurate model of the system. This research encompasses three contributions. First, by implementing an sliding mode controller and the Takagi-Sugeno fuzzy model, the proposed control strategy evaluates the stability of constant BHP drilling while incorporating external disturbances and uncertainties and employing a robust disturbance rejection technique that accounts for both transient and steady states. Second, estimating the imprecise system parameters is achieved through the adaptive control methodology. Third, a novel type of sliding manifold has been developed for use in the fuzzy sliding mode control technique. In the end, the simulation results and conclusions indicate that if the initial conditions of the drilling process are within the acceptable range of pore and fracture gradients, the bottom-hole pressure will reach a suitable reference value without exceeding the pressure window.