Self-diverting pre-flush acid for sandstone

Details Self-diverting pre-flush acid for sandstone Self-diverting pre-flush acid for sandstone

E - Fixed Constructions

21

B

E21B 43/27 (2006.01) C09K 8/74 (2006.01)

Patent

CA 2491934

Embodiments of the Present Invention relate to a reversibly thickenable non- polymeric fluid that has low viscosity in strong acid, gels when the acid concentration is reduced by only a small amount, and is subsequently decomposed by the acid. In particular it relates to an aqueous mixture of zwitterionic surfactants, inorganic acids, and organic acids Most particularly it relates to the use of this fluid as a diverting agent for easily-damaged sandstones, for example prior to matrix acidizing.

Certains modes de réalisation de cette invention ont trait à un liquide non polymère pouvant épaissir de manière réversible, ayant une faible viscosité dans un acide fort et se gélifiant lorsque la concentration d'acide n'est que peu réduite, puis qui est décomposé par l'acide. Cette invention porte, notamment, sur un mélange aqueux d'agents tensioactifs zwittérioniques, d'acides inorganiques et organiques. Elle concerne, plus précisément, l'usage qui est fait de ce liquide comme agent de dérivation pour grès endommagés, par exemple, avant une acidification de matrice.

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