Method for reducing pressure drop in the transportation of drag reducer
AssigneeConoco Inc.
InventorsSibrand A. Ubels, Steven L. Baxter
Life of this patent
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Abstract
Method for reducing pressure drop in a conduit carrying a viscous drag reducing material by injecting a lower viscosity liquid which is immiscible with the drag reducing material at the periphery of the conduit to form a flowing annular layer of such lower viscosity liquid thereby reducing the pressure drop in the conduit.
Claims13
A method for reducing the pressure drop in a conduit flowing a viscous drag reducing material which comprises injecting into the conduit at the periphery thereof a liquid material of lower viscosity substantially immiscible with the viscous drag reducing material in a sufficient amount to form a flowing layer of such liquid material on the walls of the conduit.
The method in which oil is produced from a subsea completion through a pipeline and chemicals are introduced to the subsea completion through a small diameter circular conduit which is of sufficient length that excessive pressure drop is required to transport oil soluble viscous drag reducer through such conduit, the improvement which comprises injecting into the conduit at the periphery thereof, while transporting the viscous drag reducer therethrough, a liquid material of lower viscosity and substantially immiscible with the drag reducer in a sufficient amount to form a flowing annular layer of such material in the conduit, whereby the drag reducer may be provided to the subsea completion without excessive pressure drop.
Dependencies are inferred from the claim text.