Method of secondary oil recovery

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/528 (2006.01) C09K 8/58 (2006.01) E21B 43/22 (2006.01)

Patent

CA 2727321

A method of secondary oil recovery is disclosed wherein from 0.1 to 100 000 ppm of a medium soluble aminoalkylene phosphonic acid amine salt are used wherein both the aminoalkylene phosphonic acid moiety and the amine moiety are selected from a specifically defined class of compounds. The substantially medium soluble aminoalkylene amine phosphonates exhibit a significantly improved compatibility with the recovery medium and thus can propagate fairly freely into the medium and consequently cover a largely extended rock surface before being subject to precipitation in the form of a medium insoluble scale inhibitor.The amine compound is represented by combinations of structurally different compounds.

L'invention concerne un procédé de récupération d'huile secondaire, dans lequel de 0,1 à 100 000 ppm d'un sel d'amine d'acide aminoalkylène phosphonique solubles dans le milieu sont utilisés, la partie acide aminoalkylène phosphonique et la partie amine étant choisies dans une classe de composés spécifiquement définie. Les phosphonates d'aminoalkylène amine sensiblement solubles dans le milieu présentent une compatibilité significativement améliorée avec le milieu de récupération et peuvent donc se propager relativement librement dans le milieu et couvrent par conséquent une surface rocheuse largement étendue avant d'être soumis à une précipitation sous forme d'un anti-incrustant insoluble dans le milieu. Le composé amine est représenté par des combinaisons de composés structurellement différents.

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