Subterranean fluids having improved environmental...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/467 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2580012

Subterranean fluids are provided that have improved environmental characteristics, and more particularly, subterranean fluids are provided that include a hydraulic cement in an invert emulsion. Methods of using such fluids in subterranean operations also are provided. An example of a method is a method of using a fluid in a subterranean formation. An example of a composition is a fluid comprising a hydraulic cement and an invert emulsion of an oleaginous fluid, a nonoleaginous fluid, and an emulsifying surfactant, wherein the emulsifying surfactant: has an LC50 or EC50 that is greater than about 10 milligrams/liter with respect to Skeletonema costatum, Acartia tonsa, Scopthalmus maximus (juvenile), or Corophium volutator; and demonstrates a biodegradability of: greater than about 70% biodegradation in 28 days when tested according to method OECD 301A or 301E; or greater than about 60% biodegradation in 28 days when tested according to method OECD 301B, 301C; 301F, or 306.

L'invention concerne des fluides souterrains possédant des caractéristiques améliorées au plan de l'environnement et plus particulièrement des fluides souterrains qui comportent un ciment hydraulique dans une émulsion inversée. L'invention concerne aussi des procédés d'utilisation de ces fluides dans des opérations souterraines. Un exemple de ce procédé est un procédé d'utilisation d'un fluide dans une formation souterraine, et un exemple d'une composition est un fluide comprenant un ciment hydraulique et une émulsion inversée d'un fluide oléagineux, d'un fluide non oléagineux et d'un surfactant émulsifiant, le surfactant émulsifiant comprenant un LC50 ou un EC50 qui est supérieur à environ 10 milligrammes par litre par rapport à <i>Skeletonema costatum, Acartia tonsa, Scopthalmus maximus </i>(juvenile), ou <i>Corophium volutator; </i>, et qui manifeste une capacité de biodégradation de plus d'environ 70 % en 28 jours, selon le test d'après le procédé 301A ou 301E de l'OCDE; ou une capacité de biodégradation de plus d'environ 60 % en 28 jours, selon le test d'après le procédé 301B, 301C; 301F, ou 306 de l'OCDE.

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