A controller for a downhole apparatus

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 49/08 (2006.01) E21B 47/06 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2235954

A controller for a downhole apparatus comprises means for providing signals representing values of a downhole parameter changing over time; means, responsive to the signals, for comparing a later one of the values with an earlier one of the values and for providing a plurality of output signals indicating when the later value is within different predetermined ranges of the earlier value; and means for providing a control signal to the downhole apparatus in response to a selected one of the output signals.

Régulateur d'appareil de fond-de-trou constitué des éléments suivants : un dispositif conçu pour émettre des signaux représentant les valeurs d'un paramètre de fond-de-trou variable temporellement; un dispositif qui réagit aux signaux et permet de comparer la dernière de l'une des valeurs avec une occurrence précédente de cette valeur et à fournir une série de signaux de sortie permettant d'indiquer que la dernière valeur se situe dans certaines limites d'écarts prédéterminées par rapport à la valeur antérieure; et un dispositif permettant de d'émettre un signal de commande de l'appareil de fond-de-trou en réponse à un signal de sortie particulier.

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