USE OF SELECTED OLEOPHILIC ETHERS IN WATER-BASED DRILLING FLUIDS OF THE O/W EMULSION TYPE AND CORRESPONDING DRILLING FLUIDS WITH IMPROVED ECOLOGICAL ACCEPTABILITY

摘要

The use is disclosed of at least substantially water-insoluble ethers whichare fluid and/orat least plastically deformable at working temperature and have flash pointsof at least80°C, of mono- and/or polyfunctional alcohols of natural and/orsynthetic origin orcorresponding solutions of such ethers in ecologically acceptable water-insoluble oils asthe dispersed oil phase of water-based O/W-emulsion drilling fluids which aresuitable forthe environmentally acceptable development of geological formations and whichcontain,if desired, insoluble, finely particulate weighting agents for the formationof water-basedO/W-emulsion drilling muds and/or further additives, such as emulsifiers,fluid-lossadditives, wetting agents, alkali reserves and/or auxiliary substances for theinhibition ofdrilled rock of high water-sensitivity.