Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1987-04-10
1988-07-05
Guynn, Herbert B.
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
252 8552, C23G 5036, C23G 5024
Patent
active
047552301
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 introducing 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 composition 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 isolated length prior to completion of any significant portion of the reactin required to effect temperature melting of the paraffin deposits. In a preferred form, a crystalline modifier may be incorporated into the hydrocarbon solution. After treatment, the solutions containing the dissolved pariffin are removed from the isolated conduit section.
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The Condensed Chemical Dictionary, Sixth Edition, 1966, Reinhold Pub. Corp., New York, pp. 411, 438.
Ashton Jefferson P.
McSpadden Hal W.
Nguyen Hang T.
Velasco Tara T.
Baker Oil Tools, Inc.
Guynn Herbert B.
Norvell, Jr. William C.
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