Patent ID: 9175557
Filing Date: 2015-11-03
Classification: E21B

Abstract:
1. A drilling control method for automatically triggering a remedying action responsive to an evolving or existing critical condition, the method comprising the steps of: (i) calculating process parameter boundaries which represent a critical condition for a well by using calibrated drilling process models, (ii) triggering an emergency action if a process parameter exceeds said process parameter boundaries, said emergency action being intended to minimize the effect of said critical condition, (iii) then further analyzing the well in order to determine a remedying action to then be applied, the remedying action being intended to remedy the cause of said critical condition, the remedying action being determined dynamically as a function of the response of the well to the remedying action; (iv) if said remedying action is not capable of remedying the cause of said critical condition, then applying predetermined safe process parameters or shutting down.