Institut Francais Du Pe'trole

Jean Lesage

Francois Dawans

Michel Huvey

Claude Gadelle

Alain Rivereau

Madeleine Martin

Gerard Courbin

The present invention relates to a device for detecting traces of hydrocarbon-containing pollutants present in an aqueous medium, comprising an electric circuit including at least one sensitive element reacting through degradation to the presence of said pollutants, electric means co-operating with said sensitive element and a means for checking the condition of said circuit. According to the invention, said electric means include at least two contactors holding said sensitive element in compression. FIG. 1 to be published.

Device for detecting pollutant traces in an aqueous medium

The invention relates to a process making it possible to consolidate a geological formation without significantly reducing its permeabiity. A liquid mixture (5) is injected into the formation (1) traversed by a well (2) and then at least one gas is injected through the formation under appropriate conditions. More specifically, the liquid mixture contains a polymerizable substance, preferably a melamine-formaldehyde resin, and at least one catalyst having a Lewis acid character and it substantially polymerizes at the temperature and pressure of the formation, while bonding the unconsolidated elements. Application to the consolidation of a geological formation containing sand.

Process for the consolidation of a geological formation by a substance

A material with high mechanical strength and a density close to 1 is obtained by:

Material having high mechanical strength and density close to unity, the

Process for preparing hydraulic cement slurries, concretes and mortars by admixing the usual components of said products with a hardenable fluidifying agent including in combination an aqueous solution of at least one epoxy-resin in a proportion from 0.5 to 10% of the cement weight, a hardening agent, an aqueous solution of melamine-formaldehyde at a 5 to 30% concentration thereof, in an amount from 1 to 10% of the cement weight and, optionally, an additional amount of elastomer latex in a proportion from 1 to 20% of the cement weight.

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Maurepas Elancourt, France

Jean Lesage