Dissolving barium sulfate scale with aqueous solutions of salts

Details Dissolving barium sulfate scale with aqueous solutions of salts Dissolving barium sulfate scale with aqueous solutions of salts

1979-11-05

1981-09-08

Guynn, Herbert B.

Compositions

Leather or fur treating

134 2, 134 42, 166312, 252 82, 252 86, 260338, C02F 514, E21B 4325

Patent

active

042883334

ABSTRACT:
Barium sulfate scale can be removed from remote locations such as those in or around the borehole of a well extending into a subterranean earth formation by contacting the scale with an aqueous solution consisting essentially of water, a monovalent cation salt of a macrocyclic polyether containing at least two nitrogen-linked phosphomethyl groups and enough monovalent basic compound to provide a solution pH of about 8.

REFERENCES:
patent: 3738937 (1973-06-01), Kautsky
patent: 3966766 (1976-06-01), Lehn
patent: 3996062 (1976-12-01), Frost et al.
patent: 4030548 (1977-06-01), Richardson et al.
patent: 4190462 (1980-02-01), De Jong et al.
patent: 4215000 (1980-07-01), De Jong et al.
Lehn, Accounts of Chemical Research, vol. 11, 1978, pp. 49-57.

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