Drilling fault classification based on pressure and flowrate responses via ensemble classifier in Managed pressure drilling

Downhole gas-kick transient simulation and detection with downhole dual-measurement points in water-based drilling fluid

“…where k is the time instant, and ω k and v k are the uncorrelated zero-mean Gaussian white sequences with covariances of The detailed implementation of the UKF has been studied in many researches [19,45,46,47,48]. With continuous updating of the pressure difference measurement, gas fraction, and downhole drilling-fluid flow rate can thus be determined.…”