Liquid carbon dioxide cleaning of wellbores and...

E - Fixed Constructions – 21 – B

Patent

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E21B 37/00 (2006.01) C09K 8/52 (2006.01) E21B 36/00 (2006.01) E21B 37/06 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2515901

A method to clean the wellbore and the near wellbore formation adjacent to the wellbore of the gas bearing formation adjacent to the production zone of the wellbore. The method includes the steps of injecting a treatment liquid containing from 84.5 to 100% of liquid carbon dioxide, 0 to 15% of an alcohol, and 0 to 0.5% of a surfactant into the well in a predetermined quantity and maintaining the pressure of the treatment liquid in the near wellbore formation of the gas bearing formation below the fracturing pressure of the formation, releasing the pressure on the wellbore and allowing the liquid CO2 to vaporize and other materials to blow out of the well.

L'invention concerne un procédé de nettoyage d'un puits de forage et de la formation située à proximité de celui-ci et adjacente au puits de forage d'une formation gazéifère adjacente à la zone de production du puits de forage. Le procédé comprend les étapes consistant à injecter un liquide de traitement renfermant entre 84,5 et 100 % de dioxyde de carbone liquide, entre 0 et 15 % d'un alcool et entre 0 et 0,5 % d'un tensioactif dans le puits dans une quantité prédéterminée et à conserver la pression du liquide de traitement dans la formation située à proximité du puits de forage de la formation gazéifère au-dessous de la pression de fracturation de la formation, à relâcher la pression sur le puits de forage et à permettre au liquide CO¿2? de se vaporiser et à d'autres matériaux de se projeter hors du puits.

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