Methods and systems for protecting acid-reactive substances
AssigneeHalliburton Energy Services, Inc.
InventorsAaron Michael Beuterbaugh, Enrique Antonio Reyes, Alyssa Lynn LaBlanc
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Abstract
Inadvertent or unavoidable contact of an acid with an acid-reactive substance may preclude the acid's use in another location where its reactivity is more desired. Excessive reactivity of acids toward acid-reactive substances may lead to undesired effects such as surface erosion, matrix deconsolidation, scaling, and the like. Methods for protecting an acid-reactive surface from excessive reaction may comprise: depositing a protective coating comprising an N-(phosphonoalkyl)iminodiacetic acid or any salt thereof onto an acid-reactive surface; and contacting a mineral acid or an organic acid with the protective coating without substantially reacting the acid-reactive surface.
Claims24
A method comprising:
- depositing a protective coating comprising an
- N-(phosphonoalkyl)iminodiacetic acid or any salt thereof onto an acid-reactive surface comprising an acid-reactive substance selected from the group consisting of a metal, a metal salt, a mineral, a carbonate mineral, and an acid-degradable polymer;
- and
- contacting a mineral acid or an organic acid with the protective coating without substantially reacting the acid-reactive surface where the protective coating is present for a time period when the pH of the mineral acid or organic acid in contact with the protective coating is about 3 or lower.
A method comprising:
- introducing a treatment fluid comprising an N-(phosphonoalkyl)iminodiacetic acid or any salt thereof into a wellbore penetrating a subterranean formation;
- depositing a protective coating comprising the N-(phosphonoalkyl)iminodiacetic acid or any salt thereof onto an acid-reactive surface in the wellbore;
- wherein the acid-reactive surface comprises an acid-reactive substance selected from the group consisting of a metal, a metal salt, a mineral, a carbonate mineral, and an acid-degradable polymer;
- contacting a mineral acid or an organic acid with the protective coating without etching substantially reacting the acid-reactive surface where the protective coating is present for a time period when the pH of the mineral acid or organic acid in contact with the protective coating is about 3 or lower;
- and
- diverting the mineral acid or the organic acid from a first location in the wellbore where the protective coating is deposited to a second location in the wellbore.
Dependencies are inferred from the claim text.