| abstract |
The invention relates to the use of surfactant mixtures containing alkyl oligoglycosides and alkenyl oligoglycosides (APG) of formula (I), RO-[G]p, in which R represents an alkyl and/or alkenyl radical comprising between 4 and 22 carbon atoms, G represents a sugar radical comprising 5 or 6 carbon atoms and p represents numbers from 1 to 10, mixed with free fatty acids comprising between 6 and 22 C atoms. Preferably, said mixtures are suitable for use as emulsifiers for invert drilling-fluid systems. |