Method for impulse stimulation of oil and gas well production

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01)

Patent

CA 2734631

A method for fracturing an oil or gas formation. The method includes introducing a gas impulse device into a wellbore followed by pumping a pressurized liquid into a wellbore at a pressure equal to or lower than the estimated fracture pressure of the formation. Finally, the method includes firing the gas impulse device periodically so that the device releases high pressure compressed gas impulses. The impulses when expanding through the pumped pressurized liquid substantially instantaneously increases the fracturing liquid flow rate into the oil or gas formation. It causes the total pressure to exceed the actual fracturing pressure of the formation thereby initiating or extending fractures in the formation stimulating the flow of the oil or gas therefrom into the wellbore. Use of the method of the invention in waterflooding and preventing lost circulation is also described

L'invention concerne un procédé permettant de fracturer une formation de pétrole ou de gaz. Le procédé inclut l'introduction d'un dispositif d'impulsion de gaz dans un puits de forage suivie du pompage d'un liquide sous pression dans un puits de forage à une pression égale ou inférieure à la pression de fracture estimée de la formation. Finalement, le procédé inclut le déclenchement périodique du dispositif d'impulsion de gaz de sorte que le dispositif libère des impulsions de gaz comprimé à haute pression. Les impulsions lorsqu'elles de détendent à travers le liquide sous pression pompé augmentent quasiment instantanément le débit du liquide de fracturation dans la formation de pétrole ou de gaz. Ceci fait que la pression totale dépasse la pression de fracturation réelle de la formation en initiant ou élargissant ainsi les fractures dans la formation en stimulant le débit de pétrole ou de gaz à partir de celles-ci dans le puits de forage. L'invention concerne également l'utilisation du procédé de l'invention dans l'injection d'eau et la prévention de la perte de circulation.

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