Invert emulsion well-servicing fluids
AssigneeNL Industries, Inc.
InventorsIsrael M. Brandt, Forest A. Scearce
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Abstract
A water-in-oil well servicing fluid comprising a continuous oleaginous phase, an aqueous phase, an oleophilic anhydride and lime, and a method of preparing same.
Claims22
An invert emulsion well servicing fluid comprising:
- a liquid hydrocarbon oleaginous phase, an aqueous phase, the volume ratio of said oleaginous phase to said aqueous phase being from about 99/1 to about 1/1, from about 1 to about 10 pounds per barrel of an oleophilic anhydride selected from the class consisting of an alkenylsuccinic anhydride wherein the alkenyl group contains at least 10 carbon atoms, polymers of an alkenylsuccinic anhydride containing from about 2 to about 8 alkenylsuccinic anhydride molecules per molecule of polymer and wherein the alkenyl group contains at least 10 carbon atoms, and mixtures thereof, and lime, said lime being present in an amount of at least 50% of said anhydride.
A method of preparing an invert emulsion well servicing fluid comprising mixing together an oleaginous hydrocarbon liquid, water, a water-in-oil emulsifier, from about 1 to about 10 pounds per barrel of an oleophilic anhydride selected from the class consisting of alkenylsuccinic anhydride, wherein the alkenyl group contains at least 10 carbon atoms, polymers of alkenylsuccinic anhydride containing from about 2 to about 8 alkenylsuccinic anyhydride molecules per molecule of polymer, said alkenyl group containing at least 10 carbon atoms, and mixtures thereof, and lime, said lime being present in an amount of at least 50% of said anhydride, said mixing being conducted for a period of time sufficient to increase the viscosity of the fluid.
Dependencies are inferred from the claim text.