Elf Exploration Production

Alain Viard

Michel Iato

Installation for pumping a liquid coming from an underground source, comprising a well (10) extending from the surface (12) towards the liquid source (14), the well having a chamber (40) extending substantially over its entire length, at least one tubing (18) passing through the chamber and communicating with the latter, and a set of valves (34), which is intended for putting the chamber selectively in communication with a gas source at a first pressure (36), making it possible for the liquid coming from the source to fill the chamber, and a gas source at a second pressure (38) higher than the first pressure, in order to empty the chamber, the liquid being delivered towards a first outlet (30) by flow through the tubing, characterized in that the said installation comprises, furthermore, a shutter (52), mounted in the tubing (18), and a second conduit (58; 70) leading to a second outlet (74), the shutter being capable of reacting to the density of fluid surrounding it, so that it can deliver a first liquid towards the first outlet (30), a second liquid of higher density being delivered towards the second outlet (74) via the second conduit (58; 70).

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Montardon, France

Alain Viard