C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/36 (2006.01) B01F 17/00 (2006.01) C09K 8/28 (2006.01) C09K 7/02 (1990.01)
Patent
CA 2101757
A b s t r a c t The invention relates to the use of complex esters from the reaction of (a) di- and/or tricarboxylic acids or ester-forming derivatives thereof with (b) polyhydric alcohols containing up to 6 OH groups and preferably up to 4 OH groups and/or oligomers thereof and (c) monocarboxylic acids in which the molar ratio of (b) to (a) substantially corresponds to the number of carboxyl groups per mol of reactant (a) and which are substantially free from un- reacted carboxyl groups, but may contain residual contents of free OH groups, as ecologically compatible emulsifiers of the w/o type in free-flowing and pumpable drilling fluids or other well servicing fluids which contain a disperse aqueous phase in a continuous oil phase and which are suitable for the en- vironmentally friendly development of geological deposits, for example oil and gas pools. The invention also relates to invert drilling fluids suitable for the environmentally friendly development of geological deposits and containing in a continuous oil phase a disperse aqueous and/or water-miscible alcoholic phase together with emulsifiers and other typical auxil- iaries, for example thickeners, fluid loss additives, weighting agents, water-soluble salts and alkali reserves, characterized in that, together with an ecologically compatible continuous oil phase, they contain surface- active complex esters of the type claimed in claim 1 as emulsifier or as an emulsifier component.
Herold Claus-Peter
Knoerr Walter
Mueller Heinz
Borden Ladner Gervais Llp
Henkel Kommanditgesellschaft Auf Aktien
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