Method for metal sulfate scale control in harsh oilfield conditi

Details Method for metal sulfate scale control in harsh oilfield conditi Method for metal sulfate scale control in harsh oilfield conditi

1997-02-03

1998-05-26

Hruskoci, Peter A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

166279, 166310, 210698, 252180, 507121, C02F 512

Patent

active

057559724

ABSTRACT:
A method for inhibiting barium sulfate precipitation in low pH aqueous fluids of underground petroleum-bearing formations by adding to such systems an effective amount of low molecular weight water-soluble polymer containing 5-35 weight percent sulfonic acid monomer units and 65-95 weight percent carboxylic acid monomer units, is provided. Polymer compositions based on 10-15 weight percent 2-acrylamido-2-methyl-1-propanesulfonic acid, 15-65 weight percent acrylic acid and 25-70 weight percent maleic acid are particularly preferred for use at very low pH conditions, e.g., 5.5 or less in the presence of high sulfate ion and barium ion concentrations.

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Special Publication: Royal Society of Chemistry; Third Intern. Symposium on Chemicals in the Oil Industry; No. 67, 1988 Delft, pp. 65-86, M.C. Van Der Leeden: Development of Inhibitors for Barium Sulphate Deposition.

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