Method for scale inhibition in oil wells

Details Method for scale inhibition in oil wells Method for scale inhibition in oil wells

E - Fixed Constructions

21

B

E21B 37/06 (2006.01) C09K 8/528 (2006.01) C09K 8/536 (2006.01)

Patent

CA 2484947

A method of inhibiting scale formation in a subterranean formation comprising: (a) injecting a suspension comprising particles of a controlled release scale inhibitor suspended in an aqueous medium into a formation through an injection well wherein the particles have a mean diameter of less than 10 microns, preferably less than 5 microns, more preferably less than 1 micron; (b) allowing the suspension to percolate through the subterranean formation towards a production well; and (c) controllably releasing the scale inhibitor from the particles in the near well bore region of the production well. Suitably, the particles of the controlled release scale inhibitor comprise an esterifiable scale inhibitor cross-linked with a polyol via ester cross-links.

L'invention concerne un procédé permettant d'inhiber la formation de tartre dans une formation souterraine. Ce procédé consiste : (a) à injecter dans une formation une suspension comprenant des particules d'un inhibiteur de tartre à libération contrôlée en suspension dans un milieu aqueux à travers un puits d'injection, les particules présentent un diamètre moyen inférieur à 10 microns, de préférence inférieur à 5 microns, idéalement inférieur à 1 micron ; (b) à laisser percoler la suspension vers un puits de production à travers la formation souterraine ; et (c) à libérer de manière contrôlée l'inhibiteur de tartre depuis les particules situées dans la région du trou de forage se trouvant à proximité du puits de production. De manière appropriée, les particules de l'inhibiteur de tartre à libération contrôlée contiennent un inhibiteur de tartre estérifiable réticulé avec un polyol via des doubles liaisons ester.

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