Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1995-03-27
1997-02-18
Springer, David B.
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
507224, E21B 4325, C23F 1112, C23F 1114, C23F 11167
Patent
active
056041853
ABSTRACT:
An improvement in a method for the inhibition of scale deposition on the surfaces of a well coproducing oil and scale forming brines, said method comprising injecting into the well reservoir an acidic aqueous solution at a first pH containing dissolved therein a scale inhibitor, multivalent metal cations, 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 compound 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. Such improvement comprises injecting as a preflush before said injection of inhibitor solution and/or as an afterflush after said injection of inhibitor solution, a solution of a heat sensitive pH-increasing substance and multivalent metal cations.
REFERENCES:
patent: 3827977 (1974-08-01), Miles
patent: 4602683 (1986-07-01), Meyers
patent: 5141655 (1992-08-01), Hen
patent: 5339270 (1995-03-01), Hen
patent: 5346010 (1994-09-01), Adams et al.
Keen Malcolm D.
Mobil Oil Corporation
Springer David B.
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