Water-based fluid for preventing the formation of w/o...

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/28 (2006.01) C09K 8/34 (2006.01) C09K 8/52 (2006.01)

Patent

CA 2703349

The invention relates to a water-based fluid for applications in the oil field, comprising non- ionic surfactants, stable at temperatures ranging from 10 to 90°C, having an HLB ranging from 8 to 20 and soluble in water, with a saline content ranging from 0 to 60% by weight, and possibly salts. 't'he fluid can be conveniently used as completion fluid for preventing the formation of inverse W/O emulsions or as a remedial fluid for resolving emulsions already formed in oil wells in which oil-based mud has been used.

L'invention porte sur un fluide à base aqueuse destiné à des applications dans le domaine pétrolier. Ledit fluide comprend des agents tensio-actifs non ioniques, stables à des températures se situant dans la plage de 10 à 90 °C, dont le rapport hydrophile-lipophile (HLB) se situant dans la plage de 8 à 20 et soluble dans l'eau et la teneur en solution saline dans la plage de 0 à 60 % en poids ; ainsi que, le cas échéant, des sels. De façon commode, le fluide peut être utilisé en tant que fluide de complétion pour empêcher la formation d'émulsions inverses eau/huile ou en tant que fluide de remède pour décomposer des émulsions déjà formées dans des puits de pétrole dans lesquels une boue à base d'huile a été utilisée.

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