Dissolution of sulfate scales

Details Dissolution of sulfate scales Dissolution of sulfate scales

1990-07-26

1991-10-22

Stoll, Robert L.

Compositions

Leather or fur treating

252 8555, 252 80, 252 82, 252146, 252147, 252148, 252180, 2523892, 25235922, 252390, 252392, 166279, 166300, 422 15, 422 17, E21B 4312, E21B 4102

Patent

active

050593331

ABSTRACT:
The invention provides for the use of compositions to dissolve sulfate scales from surfaces containing these scales, comprising an aqueous solution of an aminopolycarboxylic acid (APCA) containing 1 to 4 amino groups, e.g., diethylenetriaminepentaacetic acid (DTPA) or ethylenediaminetetraacetic acid (EDTA), or a salt thereof, and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) or a salt thereof. More particularly, the invention encompasses a method of removing sulfate scales from surfaces on which they have formed utilizing the foregoing solutions, particularly the removal of scales from equipment and wellbore surfaces associated with the operation of crude oil and gas wells.

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patent: 4778655 (1988-10-01), Greaves
R. H. Ashcraft, "Scale Inhibition Under Harsh Conditions by 2-Phosphonobutane-1,2,4-Tricarboxylic Acid (PBTC)", NACE (National Association of Corrosion Engineers), Paper No. 123, Boston, MA 3/29/85.

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