Abstract: In this paper, a boundary control with barrier term is proposed for a typical three-dimensional flexible riser system by integrating backstepping technique with barrier Lyapunov functions. The proposed boundary control ...

Abstract: As a key equipment for oil and gas extraction, the fracture pump is prone to failure due to fatigue crack in the crossbore of valve body. First, under acid fracture fluid and different loading frequencies, the fatigue crack ...

Abstract: During riserless drilling for ultra-deepwater gas wells, well control challenges induced by high-pressure gas kick will be faced. A two-phase flow model with consideration of high-pressure gas invasion during riserless ...

Abstract: The high temperature in the horizontal section and bottom of a horizontal well has a significant impact on the performance of mud and the safety of drilling equipment. The high bottomhole temperature is lowered often by ...