Economically dissolving barium sulfate scale with a chelating ag

Wells – Processes – Material placed in pores of formation to treat resident...

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134 2, 210 58, 252 80, 252 855B, 166312, C02B 506, C23F 1402, E21B 4327

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active

040305481

ABSTRACT:
A barium sulfate scale or solid can be dissolved economically by flowing a stream of relatively dilute aqueous solution of aminopolyacetic acid salt chelating agent into contact with and along the surfaces of the scale while correlating the composition and flow rate of the solution so that each portion of solution contains an amount of chelant effective for dissolving barium sulfate and the upstream portions of the scale are contacted by portions of the solution which are unsaturated regarding the barium-chelant complex.

REFERENCES:
patent: 2777818 (1957-01-01), Gambill
patent: 3523582 (1970-08-01), Fulford
patent: 3660287 (1972-05-01), Quattrini
patent: 3684720 (1972-08-01), Richardson
patent: 3688829 (1972-09-01), Jones
patent: 3793209 (1974-02-01), Thompson

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