Process for the cleaning of oil and gas wellbores

Details Process for the cleaning of oil and gas wellbores Process for the cleaning of oil and gas wellbores

E - Fixed Constructions

21

B

E21B 21/00 (2006.01) C09K 8/52 (2006.01) C09K 8/584 (2006.01) E21B 43/22 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2502548

Disclosed is a process for the cleaning wellbore walls, tubing or casings. The process is characterized by (a) preparing an aqueous surfactant composition containing from about 10% to 60% by weight of a mixture of surfactants, the mixture comprising from 10% to 50% by weight of an anionic derivative of an alkylpolyglycoside, from 35% to 80% by weight of an alkylpolyglycoside and from 5% to 25 % by weight of an anionic derivative of a fatty alcohol, their balance being 100%; (b) diluting the aqueous surfactant composition in water to form a diluted aqueous surfactant composition and injecting the diluted aqueous surfactant composition into a wellbore containing drilling mud, oily residues or other undesirable deposits; (c) extracting from the wellbore the diluted aqueous surfactant composition containing the drilling mud, oily residues or other undesirable deposits; (d) removing the drilling mud, oily residues or other undesirable deposits from the diluted aqueous surfactant composition; and (e) optionally, re-using the diluted aqueous surfactant composition.

L'invention concerne un procédé de nettoyage de parois, de tubages et de gainages de puits de forage, caractérisé en ce qu'il consiste (a) à préparer une composition tensioactive aqueuse contenant 10 à 60 % en poids d'un mélange de tensioactifs, ledit mélange contenant 10 à 50 % en poids d'un dérivé anionique d'un alkylpolyglycoside, 35 à 80 % en poids d'un alkylpolyglycoside, et 5 à 25 % en poids d'un dérivé anionique d'un alcool gras, leur total étant de 100 % ; (b) à diluer la composition tensioactive aqueuse dans de l'eau afin de former une composition tensioactive aqueuse diluée, et à injecter cette dernière dans un puits de forage contenant des boues de forage, des résidus de pétrole ou d'autres dépôts indésirables ; (c) à extraire du puits de forage la composition tensioactive aqueuse diluée, contenant les boues de forage, les résidus de pétrole et les autres dépôts indésirables ; (d) à éliminer les boues de forage, les résidus de pétrole et les autres dépôts indésirables de la composition tensioactive aqueuse diluée ; et, (e) à réemployer éventuellement la composition tensioactive aqueuse diluée.

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