C - Chemistry – Metallurgy – 23 – G
Patent
C - Chemistry, Metallurgy
23
G
134/28, 196/68
C23G 5/024 (2006.01)
Patent
CA 1254104
TITLE: METHOD OF AND COMPOSITION FOR REMOVING PARAFFIN DEPOSITS FROM HYDROCARBON TRANSMISSION CONDUITS ABSTRACT A method is provided for removing paraffin deposits from the interior of a hydrocarbon transmission conduit, such as a subsea pipeline. The method comprises the steps of intro- ducing into an isolated length of the conduit containing the paraffin a pre-determinable amount of an emulsified mixture of an aqueous solution and a hydrocarbon solution. The composi- tion used in the method incorporates an aqueous solution which comprises in-situ nitrogen-generating components together with a sufficient amount of a buffered pH adjuster to produce a buffered pH value for the aqueous solution to abate the time of the reaction rate of the nitrogen-generating components to a level permitting introduction of the components into the iso- lated length prior to completion of any significant portion of the reaction required to effect temperature melting of the paraffin deposits. In a preferred form, a crystalline modifier may be incorporated into the hydrocarbon solution. After treat- ment, the solutions containing the dissolved paraffin are re- moved from the isolated conduit section.
490783
Ashton Jefferson P.
Mcspadden Hal W.
Nguyen Hang T.
Velasco Tara T.
Baker Oil Tools Inc.
Borden Ladner Gervais Llp
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