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US 2025/0075338 A1Published application
Metal Sulfide Scale Dissolver For Oilfield Application
AssigneeHalliburton Energy Services, Inc.
InventorsAlex Yi-Tsung Lu, Zhiwei Yue
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Abstract
A method may include providing a treatment fluid comprising a metal sulfide dissolver and a base fluid. The metal sulfide dissolver includes a chelating agent, a boosting agent, and a dispersing agent. The treatment fluid is then injected to contact a metal sulfide scale, which dissolves at least partially. The treatment fluid may be injected into a wellbore as a standalone treatment or as an additive.
Claims20
A method comprising:
- providing a treatment fluid comprising:
- a metal sulfide dissolver comprising a chelating agent, a boosting agent, and a dispersing agent;
- and
- a base fluid;
- contacting a metal sulfide scale with the treatment fluid;
- and
- dissolving at least a portion of the metal sulfide scale with the treatment fluid.
4 more elements
A method comprising:
- preparing a treatment fluid comprising:
- a metal sulfide dissolver comprising a chelating agent, a boosting agent, and polydiallyldimethylammonium chloride (polyDADMAC);
- and
- a base fluid;
- introducing the treatment fluid into a wellbore;
- and
- contacting scale with the treatment fluid to dissolve at least a portion of the scale.
4 more elements
A treatment fluid comprising:
- an iron sulfide dissolver comprising tetrakis (hydroxymethyl) phosphonium sulfate (THPS), citric acid, and polydiallyldimethylammonium chloride (polyDADMAC);
- and
- a base fluid comprising an aqueous fluid with a pH of about 6 to about 7.
Dependencies are inferred from the claim text.