초록 ▼

A scale dissolver composition and method for using the composition is provided. Broadly, the dissolver compositions are formed by adding a base such as ammonium hydroxide to a mixture comprising a salt of a chelating agent, a carbonate, and a component selected from the group consisting of organopho

A scale dissolver composition and method for using the composition is provided. Broadly, the dissolver compositions are formed by adding a base such as ammonium hydroxide to a mixture comprising a salt of a chelating agent, a carbonate, and a component selected from the group consisting of organophosphorus compounds, carboxylic acids, and mixtures thereof. The preferred organophosphorus compound is aminotristmethylidine diphosphonic acid while the preferred chelating agent salt is EDTA tetrasodium salt. In use, the dissolver composition is preferably heated to a temperature of from about 100-170.degree. F. and then contacted with the target scale. The compositions are particularly useful for removing barium sulfate and calcium sulfate scales from gas and oil well and pipeline equipment in an efficient and cost-effective manner.

대표청구항 ▼

[ We claim:] [1.]1. A composition for dissolving metal sulfates comprising an aqueous dispersion including:a component selected from the group consisting of (1) an organophosphorus compound which is a salt of a chelating agent, (2) other organophosphorus compounds, (3) hydroxyacetic acid, and (4) mi

[ We claim:] [1.]1. A composition for dissolving metal sulfates comprising an aqueous dispersion including:a component selected from the group consisting of (1) an organophosphorus compound which is a salt of a chelating agent, (2) other organophosphorus compounds, (3) hydroxyacetic acid, and (4) mixtures thereof;sodium bicarbonate;a base; anda salt of a chelating agent when said component does not include (1) of said group.