Abstract
Summary The safe mud window is determined from 1D Mechanical Earth Model (MEM) of the well. In cases of narrow safe mud window, it is essential to use Managed Pressure Drilling (MPD) technology to evaluate wellbore stability during pipe connection operations. MPD is designed using the closed circulation system in which flow rate, mud density and choke back pressure are used to set and control the bottomhole pressure at a set point of interest. For estimating unmeasured state variables and uncertainty parameters, especially bottomhole pressure, observers’ role is vital. In this paper, the safe narrow mud window of an Iranian oil well is taken from MEM of the well. In continue, the nonlinear Extended Kalman Filter (EKF) is applied to estimate bottomhole pressure at the critical depth. The observer is designed based on topside measurements. Consistency of measurements and estimations indicates that the nonlinear EKF is recommended for estimating down hole pressure and uncertainty parameters.
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