Method for fracturing a formation to control sand production

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2218087

A method for determining the minimum length for a fracture in a fluid-producing formation to control the production of sand therefrom wherein a plurality of critical drawdown pressures are calculated from known formation data which correspond to a plurality of different, estimated respective fracture lengths. Once the critical drawdown pressures for the reservoir are correlated with their corresponding fracture lengths, a critical drawdown curve for that particular reservoir is established. Additional sets of curves are generated from known data which when overlaid with the critical drawdown pressure curve allows a minimum length of fracture to be selected which will produce the formation at a given rate at a prescribed drawdown pressure without producing any substantial amounts of sand from the formation.

L'invention concerne un procédé qui permet de contrôler la production de sable pour une rupture de formation utilisée dans la production de fluides: sur la base des données relatives à la formation qui sont connues pour une pluralité de longueurs de rupture différentes propres à un certain nombre de cas, on calcule une pluralité de pressions de rabattement critiques. Par corrélation entre lesdites pressions applicables au réservoir et les longueurs correspondantes, on obtient une courbe de pressions de rabattement critiques qui caractérise le réservoir en question. L'utilisation des données connues permet d'établir d'autres séries de courbes qui, une fois superposées à la courbe des presssions de rabattement critiques, indiquent la longueur de rupture miminum à retenir pour que la formation ne produise pas une quantité sensiblement importante de sable à un niveau donné et à une pression de rabattement spécifique.

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