Process for chemically treating reservoir pyrobitumen to...

E - Fixed Constructions – 21 – B

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E21B 43/22 (2006.01) C09K 8/58 (2006.01) C09K 8/60 (2006.01)

Patent

CA 2132664

The process involves a well stimulation treatment of a hydrocarbon reservoir containing solid pyrobitumen. A strong oxidant, preferably sodium hypochlorite, is injected into the reservoir as an aqueous solution containing 5 wt. % or higher concentration of the oxidant. The oxidant is retained in contact with the formation for a predetermined retention period and the well is then backflowed or pumped to remove oxidation products. The permeability of the reservoir is improved, apparently by conversion of the solid pyrobitumen to removable gaseousand liquid products.

Le procédé consiste en un traitement de stimulation d'un puits de réservoir d'hydrocarbures, contenant des pyrobitumes solides. Un oxydant puissant, de préférence de l'hypochlorite de sodium, est injecté dans le réservoir sous forme de solution aqueuse renfermant 5 % en poids ou une concentration plus élevée de l'oxydant. Ce dernier est maintenu en contact avec le réservoir pendant une période de rétention déterminée d'avance; le puits est ensuite soumis à un reflux ou pompé pour éliminer les produits d'oxydation. La perméabilité du réservoir se trouve améliorée, apparemment par conversion des pyrobitumes solides en produits gazeux et liquides pouvant être éliminés.

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