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AssigneesCognis Deutschland GmbH & Co. KG, Baroid Limited
InventorsHeinz Mueller, Claus-Peter Herold, Stephan von Tapavicza, Gerhard Stoll, Rainer Jeschke, Johann Friedrich Fues
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The use is disclosed of at least substantially water-insoluble ethers which are fluid and/or at least plastically deformable at working temperature and have flash points of at least 80° C., of mono- and/or polyfunctional alcohols of natural and/or synthetic origin or corresponding solutions of such ethers in ecologically acceptable water-insoluble oils as the dispersed oil phase of water-based O/W-emulsion drilling fluids which are suitable for the environmentally acceptable development of geological formations and which contain, if desired, insoluble, finely particulate weighting agents for the formation of water-based O/W-emulsion drilling muds and/or further additives, such as emulsifiers, fluid-loss additives, wetting agents, alkali reserves and/or auxiliary substances for the inhibition of drilled rock of high water-sensitivity.
A water-based, oil-in-water emulsion drilling fluid suitable for the development of geological formations comprising an emulsifier, a continuous aqueous phase containing from about 5 to about 50% by weight of an oil phase dispersed in said aqueous phase, based on the weight of said oil phase and said aqueous phase, said oil phase consisting essentially of a substantially water-insoluble ether of a mono or polyfunctional alcohol which is fluid or at least plastically deformable at use temperature and has a flash point above 80° C.
The process of developing a source of petroleum, natural gas or water by drilling, comprising drilling said source in the presence of a water-based, oil-in-water emulsion drilling fluid comprising an emulsifier, a continuous aqueous phase containing from about 5 to about 50% by weight of an oil phase dispersed in said aqueous phase, based on the weight of said oil phase and said aqueous phase, said oil phase consisting essentially of a substantially water-insoluble ether of a mono- or polyfunctional alcohol which is fluid or at least plastically deformable at use temperatures and has a flash point above about 80° C.
Dependencies are inferred from the claim text.