A temperature-stable, non eco-toxic oil-base well fluid that is particularly suitable for high pressure/high temperature drilling comprises an emulsification system comprising at least one superamide that may or may not be polyalkoxylated, optionally associated with a non-ionic co-surfactant. The oil-base well fluid comprising such a system can be used at temperatures of up to about 200.degree. C. due to the production of highly temperature-stable reverse emulsions.

 
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> Composite copper/tin/alkali metal catalysts for the direct synthesis of alkylhalosilanes

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