Cellulose injection system and method

Details Cellulose injection system and method Cellulose injection system and method

E - Fixed Constructions

21

B

E21B 33/138 (2006.01)

Patent

CA 2177809

Improved techniques are provided for controlling the injection of a cellulose powder/water mixture input into a formation through an injection well for recovery of hydocarbons. The initial dosing rate of powder added to the water is increased as a function of both the monitored pressure of the mixture in the wellbore in the vicinity of the formation and the monitored flow rate of the injected mixture. The water flow rates and the flow dosing rates are optimised, and the mixture is controlled to obtain setting within the formation to enhance the recovery of hydrocarbons. A mixing tank is designed to prevent premature setting of the mixture. Portable equipment is provided for injecting the powder/water mixture into the formation thereby increasing the versatility of the equipment reducing the overall costs of the recovery operation.

L'invention concerne des techniques améliorées pour contrôler l'injection d'un mélange d'eau/poudre de cellulose dans une formation à travers un puits d'injection, pour récupérer les hydrocarbures. On augmente le dosage initial de la poudre ajoutée à l'eau en fonction de la pression contrôlée du mélange dans le puits au voisinage de la formation, et du débit contrôlé du mélange injecté. On optimise les débits d'eau et les dosages et on contrôle le mélange afin d'assurer la prise à l'intérieur de la formation pour améliorer la récupération des hydrocarbures. Une cuve de mélange permet d'éviter la prise prématurée du mélange. Un matériel portatif est prévu pour injecter le mélange eau/poudre dans la formation, ce qui augmente la flexibilité d'utilisation du matériel et réduit ainsi les coûts globaux de l'opération de récupération.

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