FremgangsmÕte for termokjemisk avvoksing av ledninger av stor dimensjon

摘要

A method for the thermo-chemical dewaxing of a hydrocarbon transmission conduit containing paraffin deposit, said method comprising the steps of: (a) introducing into said conduit an emulsion which comprises: an internal aqueous phase comprising an oxidizing nitrogen salt, a reducing nitrogen salt and water, an external organic phase comprising a non-polar organic liquid, and a delayed action activator for inducing the reaction of said oxidizing nitrogen salt and said reducing nitrogen salt; (b) maintaining said emulsion in said conduit under conditions sufficient to fluidize the paraffin deposit and to generate nitrogen gas and heat from the reaction of said oxidizing nitrogen salt and said reducing nitrogen salt; and (c) removing fluidized paraffin deposit from said conduit; wherein the delayed action activator is a linear, aliphatic copolyanhydride solubilized in a polar organic solvent.