Conditioning of formation for sandstone acidizing

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01) C09K 8/52 (2006.01) C09K 8/72 (2006.01)

Patent

CA 2057999

A damaged zone of a subterranean oil-bearing formation is treated with four sequential fluids: (a) a formation conditioning fluid, preferably carbon dioxide, to miscibly displace oil from the damaged zone; (b) an HCl acid preflush; (c) a mud acid; and (d) an afterflush.

Traitement d'une zone endommagée d'une formation souterraine pétrolifère par quatre fluides successifs : a) un fluide de conditionnement de la formation, préférablement du dioxyde de carbone, pour déplacer par miscibilité le pétrole hors de la zone endommagée; b) un acide HCl pour prélavage; c) un acide à boue; d) un fluide de post-lavage.

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