Societe Nationale Elf Aquitaine (Production)

Daniel Sango

Christian Fouillout

The present invention relates to a process for pumping a two-phase gas/liquid mixture in an extraction well (11) whose initial gas percentage is greater than approximately 40% by volume, characterized in that it consists:

Process for pumping a gas/liquid mixture in an oil extraction well and

Method and installation for the production of hydrocarbons from a mixture of said hydrocarbons with an aqueous phase by use of a reinjection unit (7), and a separation unit (8) and with regulating the reinjection rate as a function of the content of hydrocarbons (16,15) in the aqueous phase.

Method of pumping hydrocarbons from a mixture of said hydrocarbons with

Production of pertroleum deposits in which water is mixed with the hydrocarbons. The quality of separation is controlled by incorporating within a packer (200) a regulated valve (100) which receives the flow of reinjection water after its separation in a unit (7), the water passing into a fluorescence analyzer (4). The results of the measurement are transmitted to a microprocessor unit (12) which produces a signal which actuates a hydraulic pump (9), which in its turn, actuates the valve (100). Separation of water from the hydrocarbons at the bottom of the well and control of the quality of the separation are effected before the reinjection of the water in a subterranean deposit zone (3).

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