Method and system for producing an oil and gas mixture...

E - Fixed Constructions – 21 – B

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E21B 43/12 (2006.01) E21B 43/32 (2006.01)

Patent

CA 2471282

A method and system are provided for controlling the production of oil and gas in a well such that the well operates at the edge of gas coning. Thereto the flow rate and/or pressure of the produced well effluents are controlled by a dynamically controlled choke such that continously a limited amount of gas is entrained in the produced crude oil, whereas full gas coning and breakthrough of gas from the gas cap is prevented. The choke may be controlled by a control system which includes an algorithm that takes wellhead temperatures, pressures and choke position as measured variables and which maintains the average bulk velocity of the well effluents at a substantially constant and relatively high level. Optionally, the system also maintains an optimal gas-to-liquid ratio of the well effluents.

La présente invention concerne un procédé et un système permettant le contrôle de la production de pétrole et de gaz dans un puits de sorte que le puits fonctionne à la limite d'une formation de cône de gaz. A cet effet, le débit et/ou la pression de effluents de puits produits sont contrôlés par une duse à commande dynamique de sorte qu'une limitée quantité de gaz soit entraînée en continu dans le pétrole brut produit, tout en empêchant une formation complète de cône de gaz et de percée de gaz à partir de la calotte de gaz. La duse peut être commandée par un système de commande qui comporte un algorithme qui prend en compte les températures, les pression et la position de la duse en tête de puits en tant que mesures variables et qui maintient la vitesse massive moyenne des effluents du puits à un niveau sensiblement constant et relativement élevé. Eventuellement, le système maintient également un rapport optimal gaz/liquide des effluents du puits.

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