Formulation and method for dissolution of metal sulfides, inhibition of acid gas corrosion, and inhibition of scale formation
AssigneeBaker Hughes Holdings LLC
InventorsPatrick James Rodgers, Brian Lundy, Sunder Ramachandran, David J. Poelker, James D. Ott
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Abstract
The present disclosure provides a formulation and methods for simultaneously dissolving metal sulfide scales, inhibiting acid gas corrosion, and inhibiting the formation of calcite and barite in a system having low or high shear stress conditions due to fluid movement, in which the formulation contains a THP+salt, one or more corrosion inhibitors, one or more scale inhibitors, and one or more acid corrosion inhibitors. The formulation may be applied to the system in diluted or undiluted form, and continuously or in batch style.
Claims20
A formulation for simultaneously dissolving metal sulfide scales, inhibiting acid gas corrosion, and inhibiting the formation of calcite and barite in a system, the formulation comprising:
- 15 wt % to 35 wt % of one or more tetrakis (hydroxyorgano) phosphonium salt,
- from 6 wt % to 30 wt % one or more acid gas corrosion inhibitors,
- from 2 wt % to 7 wt % of one or more scale inhibitors, and
- from greater than 0 wt % to 10 wt % of one or more acid corrosion inhibitors, all based on the formulation.
A formulation for simultaneously dissolving metal sulfide scales, inhibiting acid gas corrosion, and inhibiting the formation of calcite and barite in a system, the formulation comprising:
- 15 wt % to 35 wt % of one or more tetrakis (hydroxyorgano) phosphonium salt,
- from 6 wt % to 30 wt % one or more acid gas corrosion inhibitors selected from a group consisting of 2-mercaptoethanol, an organic phosphate ester with a variable alkyl group, a quaternized imidazoline, and combinations thereof,
- from 2 wt % to 7 wt % of one or more amine phosphonate scale inhibitors,
- from greater than 0 wt % to 10 wt % of one or more acid corrosion inhibitors selected from the group consisting of an alcohol with an acetylenic bond in the carbon backbone selected from the group consisting of propargyl alcohol, 4 ethyl-1-octyn-3-ol, and combinations thereof, and
- from greater than 0 wt % to 3 wt % of one or more surfactants selected from the group consisting of quaternary ammonium compounds, alkyl ethoxylated alcohols, and combinations thereof, all based on the formulation.
A treated fluid system, the treated fluid system comprising:
- a fluid selected from a group consisting of a production fluid, a brine, a crude oil or a fraction thereof, a wet hydrocarbon containing gas, and combinations thereof
- a formulation comprising
- from 15 wt % to 35 wt % of tetrakis (hydroxyorgano) phosphonium salt,
- from 6 wt % to 30 wt % of one or more acid gas corrosion inhibitors,
- from 2 wt % to 7 wt % of one or more scale inhibitors, and from greater than 0 wt % to 10 wt % of one or more acid corrosion inhibitors, all based on the formulation,
- where the formulation is added to the treated fluid system in high shear conditions of wall stress higher than 15 Pascals.
Dependencies are inferred from the claim text.