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In this paper, we studied the bottom hole pressure (BHP) control in an oil well during drilling. Today marginal wells with narrow pressure windows are frequently being drilled. This requires accurate and precise control to balance the bottom hole pressure between the pore and fracture pressure of the reservoir. This paper presents three control schemes to stabilize the BHP prole, including proportional-integral(PI) control, PI with feed-forward control and adaptive PI with feed-forward control. The proposed schemes are carried out through simulations on a high-fidelity hydraulic drilling simulator for flow rate changes and BHP set-point changes. In fast set-point changes and flow rate changes, the adaptive PI controller exhibits less tracking error and less oscillations than the conventional PI solution. The simulation results illustrate the effectiveness of proposed control schemes.

Adaptive PI Control of Bottom Hole Pressure during Oil Well Drilling