Method for stimulation of liquid flow in a well

Details Method for stimulation of liquid flow in a well Method for stimulation of liquid flow in a well

E - Fixed Constructions

21

B

E21B 36/00 (2006.01) E21B 37/00 (2006.01) E21B 43/25 (2006.01) E21B 43/27 (2006.01)

Patent

CA 2175586

A method of stimulating a flow of water into a well (10, 22) from water pools in strata surrounding the well (10, 22). The well (10, 22) is sealed in a manner such that pressurization of the well (10, 22) can be accomplished. Liquified carbon dioxide is introduced into the well (10, 22) at a down hole pressure such that the liquified carbon dioxide solidifies with the well (10, 22) forming solid carbon dioxide and introduction of the liquified carbon dioxide is continued into the well (10, 22) until a desired level of filling of the well (10, 22) is attained. The sealed well (10, 22) containing solid carbon dioxide is allowed to stand for a time sufficient to sublime the solid carbon dioxide contained in the sealed well (10, 22) and the residual pressure is released in the sealed well (10, 22) and the seal removed from the well (10, 22).

Cette invention se rapporte à un procédé pour stimuler un écoulement d'eau en direction d'un puits (10, 22) à partir de poches d'eau en strates entourant le puits (10, 22). A cet effet, le puits (10, 22) est scellé pour qu'on puisse le mettre sous pression. Du dioxyde de carbone liquéfié est alors introduit dans le puits (10, 22), à une pression basse, pour que le dioxyde de carbone liquéfié se solidifie dans le puits (10, 22), formant ainsi du dioxyde de carbone solide, et on maintient l'introduction de dioxyde de carbone liquéfié dans le puits (10, 22) jusqu'à atteindre un niveau désiré de remplissage du puits (10, 22). Le puits scellé (10, 22), contenant du dioxyde de carbone solide, est ensuite laissé au repos pendant une période suffisante pour produire la sublimation du dioxyde de carbone solide contenu dans le puits scellé (10, 22), et la pression résiduelle reignant dans le puits scellé (10, 22) est libérée et la fermeture étanche du puits (10, 22) est retirée.

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