Byk-chemie Gmbh

Jasmin Rudner

René Nagelsdiek

Jürgen Omeis

Daniela Leutfeld

Sylvia Bühne

Alan Lawrence Steinmetz

Marc Eberhardt

George Mark Zody

Dominika Bernert

Justin Adams

Christiane Knappke-Bongartz

Lee Robyn Gunning

Alan Steinmetz

Sylvia Buehne

Rene Nagelsdiek

The invention relates to a drilling fluid in the form of a water-in-oil (W/O) emulsion comprising at least components (A) to (D), wherein component (D) is at least one (meth)acrylic copolymer, which contains at least one of structural units (D1), (D2) and (D3) to introduce at least one hydroxyl and/or amino functionality into the copolymer and which further contains at least one structural unit (D4), a use of said (meth)acrylic copolymer as rheological agent in drilling fluids, which are water-in-oil (W/O) emulsions, as well as to a method of producing oil and/or natural gas or of preparing the production thereof comprising the step of using the inventive drilling fluid for generating and/or operating a drill hole.

(Meth)acrylic copolymers as rheological additives in drilling fluids and drilling fluids comprising such copolymers

The invention relates to a rheology control agent containing i) 15-95% by weight of an amide compound (A), ii) 5-75% by weight of a urea compound (B), iii) 0-50% by weight of an ionogenic compound (C) and iv) 0-35% weight of an organic solvent (D).

Composition for rheology control

The present invention relates to a composition effective as a rheology additive containing 15-95 wt.-% of an oxygen compound (A), 5-75 wt.-% of a urea compound (B), 0-50 wt.-% of an ionogenic compound (C) and 0-35 wt.-% of an organic solvent (D).

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Dinslaken, Germany

Jasmin Rudner