System and process for secondary hydrocarbon recovery

Details System and process for secondary hydrocarbon recovery System and process for secondary hydrocarbon recovery

E - Fixed Constructions

21

B

E21B 47/00 (2006.01) E21B 43/16 (2006.01) E21B 43/24 (2006.01) E21B 47/10 (2006.01) G01V 7/00 (2006.01)

Patent

CA 2330969

A hydrocarbon reservoir undergoing secondary recovery is subject to a first and then at least a second gravity gradient survey in which a gravity gradiometer takes gradient measurements on the surface above the reservoir to define successive data sets. The differences between the first and subsequent gravity gradient survey yields information as to sub-surface density changes consequent to displacement of the hydrocarbon and the replacement thereof by the driveout fluid including the position, morphology, and velocity of the interface between the hydrocarbon to be recovered and the driveout fluid.

L'invention se rapporte à un réservoir d'hydrocarbures soumis à une récupération secondaire, sur lequel on effectue un premier puis au moins un second sondage de gradients de gravité au moyen d'un gradiomètre de gravité qui permet d'effectuer des mesures de gradients à la surface supérieure du réservoir de façon à définir des ensembles de données successives. Les différences entre le premier sondage de gradients de gravité et les sondages ultérieurs permettent d'obtenir des informations relatives aux changements de densité sous-marine qui font suite au déplacement de l'hydrocarbure et à son remplacement par le fluide de purge. Ces informations concernent la position, la morphologie et la vitesse de l'interface entre l'hydrocarbure à récupérer et le fluide de purge.

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