C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
C11D 10/00 (2006.01)
Patent
CA 2592209
A composition for removing paraffin, wax, or asphaltine deposits from the surface of a crude oil transmission system, such as a downhole tubular, a pipeline, or a surface tank, includes an aqueous sodium hydroxide solution containing from 18% to 25% by weight sodium hydroxide. The composition further includes an acetic acid solution containing from 30% to 55% by weight acetic acid compared to the sodium hydroxide, and a liquid aromatic hydrocarbon having from 6 to 10 carbon atoms and from 15% to 40% by weight compared to the sodium hydroxide. According to the method of the invention, the aqueous sodium hydroxide solution may be metered in a downhole tubular or a pipeline separate from the acetic acid solution, such that heat generated by the mixed composition is generated within the downhole tubular or the pipeline.
L'invention concerne une composition servant à enlever des dépôts de paraffine, de cire ou asphaltiques de la surface d~un système de transport de pétrole brut, tel qu~un tube de forage, un pipeline ou un réservoir en surface, comprenant une solution aqueuse d~hydroxyde de sodium contenant de 18 % à 25 % en poids d~hydroxyde de sodium. La composition comprend en plus une solution d~acide acétique contenant de 30 % à 55 % en poids d~acide acétique par rapport à l~hydroxyde de sodium ; et un hydrocarbure aromatique liquide ayant de 6 à 10 atomes de carbone en quantité de 15 % à 40 % en poids par rapport à l~hydroxyde de sodium. Selon le procédé de l~invention, la solution aqueuse d~hydroxyde de sodium peut être dosée dans un tube de forage ou un pipeline séparément de la solution d~acide acétique, de façon à ce que la chaleur générée par la composition mélangée soit générée à l~intérieur du tube de forage ou du pipeline.
Als Jerome S.
Finlayson & Singlehurst
LandOfFree
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