| CPC C09K 8/532 (2013.01) [E21B 37/06 (2013.01)] | 9 Claims |
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1. A method comprising:
providing a treatment fluid comprising:
a metal sulfide dissolver comprising a chelating agent, a boosting agent, a scaling agent, and a dispersing agent,
wherein the chelating agent comprises tetrakis (hydroxymethyl) phosphonium sulfate (THPS), salts thereof, or combinations thereof in an amount of about 0.03 wt % to about 0.1 wt % by weight of the treatment fluid;
wherein the boosting agent comprises citric acid in an amount of about 0.02 wt % to about 0.07 wt % by weight of the treatment fluid;
wherein the scaling agent comprises diethylene triamine penta (methylene phosphonic acid) (DTPMP) in an amount of about 0.003 wt % to about 0.02 wt % by weight of the treatment fluid;
wherein the dispersing agent comprises polydiallyldimethylammonium chloride (polyDADMAC) in an amount of about 25 ppm to about 200 ppm by weight of the treatment fluid; and
a base fluid;
contacting a metal sulfide scale with the treatment fluid; and
dissolving from 67% to 97% of the metal sulfide scale with the treatment fluid.
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