Method of dissolving organic filter cake obtained in...

Details Method of dissolving organic filter cake obtained in... Method of dissolving organic filter cake obtained in...

E - Fixed Constructions

21

B

E21B 37/08 (2006.01) C09K 8/52 (2006.01) C09K 8/90 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2139624

The invention shows a method of degrading damaging material within a subterranean formation of a well bore using an enzyme treatment. Filter cakes and very viscous fluids are such damaging materials. The enzyme treatment degrades polysaccharide-containing filter cakes and damaging fluids which reduces their viscosity. The degraded filter cake and damaging fluid can then be removed from the formation back to the well surface. The particular enzymes utilized are specific to a particular type of polysaccharide and are active at low to moderate temperatures. The enzymes attack only specific linkages in filter cakes and damaging fluids and are active in the pH range of about 2.0 to 10Ø

Cette invention concerne un procédé permettant de décomposer avec un traitement enzymatique des matériaux dangereux situés dans une formation souterraine d'un trou de forage de puits. Ces matériaux dangereux peuvent être des gâteaux de filtre ou des fluides très visqueux. Le traitement enzymatique décompose les gâteaux de filtre contenant des polysaccharides et les fluides dangereux, afin de réduire leur viscosité. On peut ensuite retirer de la formation le gâteau de filtre et le fluide dangereux décomposés et les remonter à la surface du puits. Les enzymes particulières utilisées sont spécifiques contre un type particulier de polysaccharide, et elles sont actives dans des conditions de températures faibles à modérées. Ces enzymes ne s'attaquent qu'aux liaisons spécifiques dans les gâteaux de filtre et les fluides dangereux et elles sont actives dans la plage de pH comprise entre environ 2,0 et 10,0.

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