Core annular flow of heavy crude oils in transportation...

F - Mech Eng,Light,Heat,Weapons – 17 – D

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F17D 1/08 (2006.01) B01F 17/12 (2006.01) B65G 53/00 (2006.01) C09K 8/584 (2006.01) E21B 21/14 (2006.01) F15D 1/02 (2006.01) F17D 1/17 (2006.01)

Patent

CA 2658791

A method is provided for enhancing the shear stability of a high-viscosity fluid-water flow system, such as a core annular flow system. The method employs a family of demulsifier additives for maintaining separation of the fluids in biphasic flow. The additive family is sodium salts of polynuclear aromatic sulfonic acids. In one aspect, the high-viscosity fluid is heavy oil. A method of transporting heavy oil through a tubular body is also provided. The method includes pumping the heavy oil through the tubular body within an annular flow of water, and subjecting the water in the tubular body to a salt of a polynuclear, aromatic sulfonic acid additive so as to improve shear stability of the heavy oil and water.

La présente invention concerne un procédé permettant de renforcer la stabilité en cisaillement d'un système de flux de fluide-eau de haute viscosité, tel qu'un système de flux annulaire central. Ce procédé utilise une famille d'additifs démulsionneurs destinés à maintenir la séparation des fluides dans un flux biphasique. Cette famille d'additifs est constituée de sel de sodium d'acides sulfoniques aromatiques polynucléaire. Dans un aspect de l'invention, le fluide haute viscosité est du pétrole lourd. L'invention concerne aussi un procédé de transport de pétrole lourd à travers un corps tubulaires. Ce procédé consiste à pomper le pétrole lourd à travers ce corps tubulaire à l'intérieur d'un flux annulaire d'eau et à soumettre cette eau dans le corps tubulaire à un sel d'un additif acide sulfonique aromatique polynucléaire afin d'améliorer la stabilité en cisaillement de ce pétrole lourd et de l'eau.

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