Sulfate scale dissolution

Details Sulfate scale dissolution Sulfate scale dissolution

1992-01-16

1993-04-06

Walsh, Donald P.

Compositions

Radioactive compositions

252 82, 252180, 134 3, 134 2211, 210698, 423170, G21F 900

Patent

active

052001172

ABSTRACT:
Alkaline earth metal scales, especially barium sulfate scale deposits are removed from oilfield pipe and other tubular goods with a scale-removing composition comprising an aqueous alkaline solution having a pH of about 8 to about 14, preferably about 11 to 13, of a polyaminopolycarboxylic acid, preferably EDTA or DTPA and a catalyst or synergist comprising a monocarboxylic acid, preferably a substituted acetic acid such as mercaptoacetic, hydroxyacetic acid or aminoacetic acid or an aromatic acid such as salicylic acid. When the scale-removing solution is contacted with a surface containing a scale deposit, substantially more scale is dissolved at a faster rate than is possible without the synergist.

REFERENCES:
patent: 2877848 (1959-03-01), Case
patent: 3660287 (1972-05-01), Quattrini
patent: 3684720 (1972-08-01), Richardson
patent: 3873362 (1975-03-01), Muhram et al.
patent: 3951827 (1976-04-01), Burroughs et al.
patent: 3956164 (1976-05-01), Walker et al.
patent: 4030548 (1977-06-01), Richardson et al.
patent: 4144185 (1979-03-01), Block
patent: 4190462 (1980-02-01), De Jong et al.
patent: 4215000 (1980-07-01), De Jong et al.
patent: 4226640 (1980-10-01), Bertholdt
patent: 4276185 (1981-06-01), Martin
patent: 4288333 (1981-09-01), Van Zon et al.
patent: 4652377 (1987-03-01), Amijad
patent: 4708805 (1987-11-01), D'Muhala
patent: 4726907 (1988-02-01), D'Muhala et al.
patent: 4731124 (1988-03-01), Bradburry et al.
patent: 5045273 (1991-09-01), Gassen et al.

Affiliated with

Also associated with

Rating

Sulfate scale dissolution does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sulfate scale dissolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sulfate scale dissolution will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-534303