Spotting fluid for differential sticking

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/36 (2006.01) E21B 31/00 (2006.01) E21B 31/03 (2006.01)

Patent

CA 2434142

A new composition for a spotting fluid and a method of using such spotting fluid for freeing differential stuck pipe in a subterranean well drilling operation is disclosed. The composition comprises an invert water-in-oil emulsion comprising iso-butyl oleate as its external phase and glycerin as the internal phase. In an alternative embodiment, calcium chloride and water may be substituted for glycerin.

L'invention concerne une composition pour un fluide de spotting, ainsi qu'un procédé d'utilisation de ce fluide de spotting pour libérer des tiges coincées par pression différentielle dans une opération de forage d'un puits souterrain. Cette composition comprend une émulsion eau dans l'huile inverse comprenant de l'oléate isobutylique en tant que phase externe et de la glycérine en tant que phase interne. Dans un mode de réalisation différent, du chlorure de calcium et de l'eau peuvent remplacer la glycérine.

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