C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/38 (2006.01) C09K 8/536 (2006.01) C09K 8/94 (2006.01) E21B 21/06 (2006.01) E21B 21/14 (2006.01)
Patent
CA 2293211
- A process and a system for subsurface operation including at least the steps of circulating an aqueous foam composition in a wellbore, said composition having a determined pH value with an ionic surface active agent and a polyampholyte polymer whose charge depends on the pH value. When the pH value is varied, the foam becomes destabilized and "breaks" more easily at the surface and eventually recycles the foam solution. - The invention also relates to an aqueous foam composition for implementing the process. - Application to drilling operations and oil well completion operations requiring a well fluid of lower density.
- La présente invention concerne un procédé et un système d'exploitation du sous-sol comportant au moins l'étape de circulation dans un puits d'une composition moussante de pH déterminé comportant un tensioactif ionique et un polymère polyampholyte dont la charge dépend du pH. En faisant varier le pH, on provoque la déstabilisation de la mousse de façon à "casser" plus facilement la mousse de retour à la surface et éventuellement recycler la solution moussante. - L'invention concerne également une composition moussante à base d'eau pour la mise en oeuvre du procédé. - Application aux opérations de forage et aux opérations de complétion des puits pétroliers nécessitant l'usage d'un fluide de puits de faible masse volumique.
Argillier Jean-Francois
Roche Philippe
Institut Francais Du Petrole
Robic
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