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US 12,735,627 B2Granted
Single-phase retarded acid systems using amino acids
AssigneeSchlumberger Technology Corporation
InventorsHaiyan Zhao, Murtaza Ziauddin, Philippe Enkababian, Temiloluwa Yusuf, Patrice Abivin, Abraham Ryan
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Abstract
Treatment of hydrocarbon formations using single-phase aqueous acid blends that contain arginine is described herein. The single-phase aqueous fluid includes one or more strong acid molecules and arginine in water, wherein the one or more strong acid molecules are present in a concentration range of 7.5 wt % to 28 wt %, based on the weight of the aqueous fluid, and arginine is present in a molar ratio of arginine to the one or more strong acid molecules that is from 1:100 to 1:5.
Claims18
A single-phase aqueous fluid comprising:
- water;
- one or more strong acid molecules;
- an amino acid component comprising arginine;
- and
- a surfactant having an affinity for acid-susceptible species in a subterranean formation, the surfactant cooperating with the amino acid component to retard an acid reaction rate of the one or more strong acid molecules with the subterranean formation,
- wherein the surfactant comprises a betaine-based material,
- wherein a mass ratio of the amino acid component to the surfactant is from 4:1 to 10:1,
- wherein the surfactant is present in an amount sufficient to further retard the acid reaction rate of the one or more strong acid molecules with the subterranean formation relative to the amino acid component with no surfactant.
5 more elements
Dependencies are inferred from the claim text.