Process for treating an oil well

Details Process for treating an oil well Process for treating an oil well

E - Fixed Constructions

21

B

E21B 37/06 (2006.01) C09K 8/52 (2006.01) C09K 8/54 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2394028

A method of treating a subterranean formation, the method comprising: (A) injecting down a well bore into the formation an admixture of (a) an emulsion having an internal aqueous phase comprising a water-soluble oil or gas field chemical or an aqueous dispersion of a water-dispersible oil or gas field chemical and an external oil phase comprising a liquid hydrocarbon and an oil-soluble surfactant and (b) a demulsifier comprising a solution of a surfactant having a cloud point temperature of above 40 °C; or (B) separately injecting down a well bore into the formation emulsion (a) and demulsifier (b) and generating an admixture of emulsion (a) and demulsifier (b) within the formation.

Procédé de traitement d'une formation souterraine, ce qui consiste à: (A) injecter dans la formation par le bas du puits de forage, un mélange composé (a) d'une émulsion possédant une phase interne aqueuse contenant une substance chimique soluble dans l'eau huileuse ou gazeuse ou une dispersion aqueuse d'une substance chimique huileuse ou gazeuse dispersible dans l'eau, et une phase externe huileuse contenant un hydrocarbure liquide et un tensioactif soluble dans l'huile, (b) un désémulsionneur contenant une solution de tensioactif dont la température du point de trouble est supérieure à 40 DEG C; ou (B) injecter séparément dans la formation par le bas du puits de forage une émulsion (a) et un désémulsionneur (b) et générer un mélange d'émulsion (a) et de désémulsionneur (b) à l'intérieur de la formation.

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