| abstract |
A composition and a method for treating wells having metal tubulars therein are disclosed, which composition comprises; (a) an aqueous acid solution; (b) first metal ions selected from the group consisting of Sb, Bi, Cu (cuprous), and mixtures thereof; (c) second metal ions selected from the group consisting of Ca, Mg, Al, Zn, Zr, Sn, and mixtures thereof, the mole ratio of the first metal ions to the second metal ions ranging from 1:10 to 10:1; (d) one or more quaternary aromatic ammonium compounds complexed with each of the first and second metal ions, the concentration of the quaternary ammonium compound and the metal ions complexed therewith ranges from 0.1 to 10 weight % of the aqueous acid solution, and (e) an effective amount of a surfactant to disperse the complexed metal ions in the acid solution. |