Shear-sensitive plugging fluid for plugging and a method for...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/46 (2006.01) C09K 8/514 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2371122

A plugging fluid for plugging a subterranean formation zone surrounding a drill hole consisting of an emulsion comprising an oil phase containing an oil, an emulsifier and 2.4 to 4 kg of cement per liter of oil and an aqueous phase containing water and 12-16g of polysaccharide per liter of water, wherein the oil to water volume ratio ranges from 20:80 to 25:75. Upon shearing, the emulsion inverts so that the rupture of the emulsion droplets releases the cement into the water phase thus providing metallic divalent ion to crosslink with the polysaccharides and forming a gel structure.

L'invention concerne un liquide colmatant destiné au colmatage d'une zone de formation souterraine autour d'un forage. Ce liquide consiste en une émulsion comprenant : une phase huileuse contenant une huile, un émulsifiant et de 2,4 à 4 kg de ciment par litre d'huile ; et une phase aqueuse contenant de l'eau et 12 à 16 g de polysaccharide par litre d'eau ; le rapport entre le volume d'eau et le volume d'huile dans l'émulsion étant compris entre 20:80 et 25:75. Lors du cisaillage, l'émulsion s'inverse de sorte que la rupture des gouttelettes de l'émulsion entraîne la libération du ciment dans la phase aqueuse permettant ainsi à un ion divalent métallique de réticuler avec les polysaccharides et de former un structure gélatineuse.

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