Method for removing ammonium ions from a subterranean formation

Mining or in situ disintegration of hard material – In situ conversion of solid to fluid – Input and output wells

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166252, 166270, 405263, E21B 4328, E21B 4700

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active

044744080

ABSTRACT:
The ammonium ions in a subterranean clay-containing formation may be removed by flushing the formation with a calcium ion containing restoration fluid having substantially the highest pH effective to prevent precipitation of calcium hydroxide from said restoration fluid. The calcium ion concentration in the restoration fluid is maintained between about 10,000 and 100,000 ppm until the ammonia concentration in the produced fluid peaks or is less than about 100 ppm. Thereafter the calcium ion concentration is maintained at about 400 to about 600 ppm until the desired level of ammonia is obtained, usually about 1-3 ppm.

REFERENCES:
patent: 4079783 (1978-03-01), Snavely et al.
patent: 4114693 (1978-09-01), Foster et al.
patent: 4134618 (1979-01-01), Kossack
patent: 4162707 (1979-07-01), Yan
patent: 4234231 (1980-11-01), Yan
patent: 4300860 (1981-11-01), Yan
patent: 4314779 (1982-02-01), Sundar et al.
patent: 4372616 (1983-02-01), Paul et al.
"Removal of Ammonium Ions from Subterranean Formations by Flushing with Lime Saturated Brines"; SME-AIME Annual Meeting; Dallas, Texas; Feb. 14-18, 1982; Yan and Espenscheid.

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