Control system design for a mixing system with multiple inputs

G - Physics – 05 – D

Patent

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Details

G05D 11/13 (2006.01) B01F 15/04 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2604698

A control system for mixing at least two materials in a physical system, for example cement and water for a well bore, having two or more tanks comprises at least two actuators, each actuator being operable to introduce a material into a first tank to form a first mixture, the first mixture flowing into a second tank to form a second mixture and a controller operable, based on a commanded input, to control the at least two actuators to obtain a density of either the first mixture or the second mixture and a volume flow rate of the second mixture out of the second tank, wherein the density is controlled independently from the volume flow rate, and wherein the commanded input comprises a commanded combined volume flow rate and a commanded combined mass flow rate of the materials passing through the actuators into the first tank.

L'invention concerne un système de commande permettant de mélanger au moins deux matériaux dans un système physique, par exemple du ciment et de l'eau pour un puits de forage, ayant deux ou plus de deux réservoirs comprenant au moins deux actionneurs, chaque actionneur pouvant être commandé pour introduire un matériau dans un premier réservoir pour constituer un premier mélange, le premier mélange s'écoulant dans un second réservoir pour constituer un second mélange et un contrôleur que l'on peut solliciter, sur la base d'une entrée commandée, pour commander lesdits actionneurs pour obtenir une densité du premier mélange ou du second mélange et un débit volumique du second mélange sortant du second réservoir, la densité étant contrôlée indépendamment du débit volumique, et l'entrée commandée comprenant un débit volumique commandé combiné et un débit massique commandé combiné des matériaux passant par les actionneurs dans le premier réservoir.

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