C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/34 (2006.01) C09K 8/02 (2006.01) E21B 31/03 (2006.01)
Patent
CA 2318341
The invention relates to a well fluid for releasing tubular elements stuck in the well. The fluid consists of a part A constituted by one or more esters obtained by reaction of a linear or branched monocarboxylic acid (A.1) having between 8 and 24 carbon atoms and a linear or branched polyol (A.2) having between 2 and 20 carbon atoms, a part B constituted by one or more linear or branched monocarboxylic acids having between 8 and 24 carbon atoms, where the carboxylic acid (A.1 and part B) is a mixture of at least 80 % carboxylic acids having between 1 and 3 insaturations, and a part C constituted by a different ester or olefins. The quantity of part C is determined in relation to the other components in such a way that the viscosity of the fluid is lower than 40 mPa at 40 ·C. The invention also relates to a method for releasing drill stems stuck in a well.
La présente invention concerne un fluide de puits pour libérer des éléments tubulaires coincés dans le puits. Le fluide comporte: une partie A constituée par un ou plusieurs esters obtenus par réaction d'un acide mono carboxylique (A.1), linéaire ou branché, comprenant de 8 à 24 atomes de carbone et d'un polyol (A.2), linéaire ou branché, comprenant de 2 à 20 atomes de carbone; une partie B constituée d'un ou plusieurs acides mono carboxyliques, linéaires ou branchés, comprenant de 8 à 24 atomes de carbone, l'acide carboxylique (A.1 et partie B) étant un mélange d'au moins 80 % d'acides carboxyliques ayant 1 à 3 insaturations; une partie C constituée d'un autre ester ou d'oléfines, la quantité de partie C est déterminée par rapport aux autres composants de façon que la viscosité du fluide soit inférieure à 40 mPa.s à 40 ~C. L'invention concerne également une méthode pour libérer des tiges coincées dans un puits.
Argillier Jean-Francois
Audibert-Hayet Annie
Demoulin Andre
Janssen Michel
Fina Research
Institut Francais Du Petrole
Robic
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