Viscous oleaginous fluids and methods of drilling and...

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/32 (2006.01) C09K 3/00 (2006.01) C09K 8/64 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2480949

The invention provides (1) a method of increasing the thermal stability of an oleaginous liquid containing a high surface area silica viscosifier therein by adding a water soluble biopolymer thereto; and (2) a drilling, completion, workover, or well servicing fluid comprising an oleaginous liquid, a water soluble biopolymer, and a high surface area silica viscosifier. The method and fluid may optionally contain a low molecular weight polar additive preferably having a molecular weight less than about 400 and containing one or more polar groups per molecule selected from the group consisting of hydroxyl, amino, and mixtures to thereof.

L'invention concerne (1) un procédé permettant d'augmenter la stabilité thermique d'un liquide oléagineux, qui contient un améliorant de viscosité à base de silice à surface active élevée, par adjonction d'un biopolymère soluble dans l'eau; et (2) un fluide de forage, de complétion, de reconditionnement ou d'entretien de puits comprenant un liquide oléagineux, un biopolymère soluble dans l'eau et un agent améliorant de viscosité à base de silice à surface active élevée. Le procédé et le fluide peuvent éventuellement contenir un additif polaire de faible poids moléculaire possédant, de préférence, un poids moléculaire inférieur à environ 400 et contenant un ou plusieurs groupes polaires par molécule sélectionné(s) dans le groupe constitué par hydroxyle, amino et des mélanges de ceux-ci.

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