C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 5/14 (2006.01) C09K 8/528 (2006.01)
Patent
CA 2041586
A method for the inhibition of scale deposition on thesurfaces of a well coproducing oil and scale forming brines rising infecting into the well reservoir an acidic (aqueous) solution at a first pH containing dissolve therein a scale inhibitor, multivalent metal ions, and a heat sensitive pH increasing substance which decomposes at elevated temperatures liberating an alkaline compound such that the solution is inherently heated by the higher ambient reservoir temperature to a temperature at which the alkaline pound is liberated from the heat sensitive substance thus raising the pH of the solution to a point at which a sparingly soluble multivalent metal salt of the scale inhibitor is phase separated from the solution on the porous surfaces of the reservoir rock formation, providing for a slow release of inhibitor into the produced brines when the well is in its production phase.
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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