Institut Francais Du Pe'trole

Ifp Energies Nouvelles

Alain Driancourt

Annie Audibert

David Pasquier

Andre Deschamps

Jacques Jarrin

Bernard Dewimille

Jean Hardy

Eric Robert

Rene Avrillon

Jean-Claude Mileo

The present invention relates to a well drilling, completion or workover fluid wherein the continuous phase of the fluid essentially consists of a liquid fluorinated compound. In a variant, the liquid fluorinated compound is a perfluorinated compound.

Well fluid comprising a fluorinated liquid phase

A well drilling, completion or workover fluid has a continuous phase of the fluid essentially consists of a liquid fluorinated compound. In a variant, the liquid fluorinated compound is a perfluorinated compound.

Flexible pipeline having a dual-layer sheath of polymer

Disclosed is a gas separation membrane, comprising a film with a thickness ranging from 0.05.10.sup.-6 to 20.10.sup.-6 m, at least 90% by mole of which is at least one aromatic polyimide or copolyimide, the recurrent unit of which corresponds to the following formula (I): ##STR1## where A represents a tetravalent aromatic radical at least 50% by mole of which are represented by the following formula (II): ##STR2## and B represents a bivalent aromatic radical or a mixture of bivalent aromatic radicals.

Gas separation membrane

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L'Hay les Roses, France

Alain Driancourt