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US 2012/0059521 A1Published application
Drilling control method and system
AssigneeDrilltronics Rig System AS
InventorsFionn Iversen, Eric Cayeux
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AssigneeDrilltronics Rig System AS
InventorsFionn Iversen, Eric Cayeux
Estimating the term…
Method and system for drilling control comprising a plurality of controllers adapted to control performance process parameters, on the basis of driller controls from a driller that provides this as instructions to said controllers, wherein the system further comprises sensors and means for obtaining process values, such as downhole pressure, temperature and torque, where- in the system is adapted to, continuously and/or repeatedly, calculate safeguard envelopes for performance process parameters on the basis of process values and drilling process models and that it is adapted to restrain said controllers from applying performance process parameters outside said safeguard envelopes as a result of driller instructions, and—a method and system for automatically triggering a remedying action in case of an evolving or existing critical situation, comprising calculation of process parameter boundaries which represent a critical condition for the well by using calibrated drilling process models, comprising (i) triggering an emergency action if a parameter exceeds said boundaries, said emergency action being intended to minimize the effect of said critical situation, (ii) then further analyzing the well in order to determine which remedying action to then be applied, the remedying action being intended to remedy the cause of said effect; (iii) if said remedying action is not capable of remedying the cause of said effect, then applying predetermined safe process parameters or shutting down.
A method of imposing safeguard during drilling of a well by the use of a drill rig having at least a speed controlled pipe string hoist, wherein performance process control parameters are controlled through machine controllers, wherein a driller drills a well by controlling said process control parameters through said machine controllers with driller instructions, and wherein process values are provided, to a safeguard calculation unit, where the safeguard calculation unit calculates safeguard limits for the process control parameters, derived from process limits, such that at least some of said safeguard limits constitute boundary values of performance process parameter-related safeguard envelopes, the method comprising the steps of:
(canceled)
A method for automatically triggering a remedying action in case of an evolving or existing critical situation, including calculation of process parameter boundaries which represent a critical condition for the well by using calibrated drilling process models, in the method comprising the steps of:
A system for calculation of the acceptable threshold conditions before determining that the well has entered a critical situation, adapted to apply the calibrated drilling process models in said calculation, wherein, in case a parameter is exceeding the continuously updated conditions for a critical situation, an automatic action is triggered automatically to minimize the effect of the critical situation, wherein this automatic action can adapt itself as a function of the response of the well to the automatic action, the system comprising:
Dependencies are inferred from the claim text.