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US 2026/0234466 A1Published application
Low viscosity polymer-based retarded acid
AssigneeSchlumberger Technology Corporation
InventorsJulia FERNANDEZ DEL VALLE, Christopher DAEFFLER, Mohan PANGA
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Abstract
Treatment of hydrocarbon formations using acid blends that contain water soluble polymers having chemical affinity for acid-susceptible rock species in the hydrocarbon formation is described herein. The polymers retard the activity of acid on acid-susceptible species of rock formations.
Claims20
A method of stimulating a hydrocarbon reservoir, the method comprising:
- preparing a single-phase aqueous mixture comprising a strong acid and a water-soluble cationic polymer, wherein the water-soluble cationic polymer is present in the aqueous mixture at a concentration of from about 0.05 g/100 mL to about 0.25 g/100 mL;
- and
- causing the aqueous mixture to contact a carbonate containing formation of a hydrocarbon reservoir, wherein the strong acid dissolves a portion of the carbonate containing formation, thereby creating one or more conductive channel within the carbonate containing formation, and wherein the water-soluble cationic polymer reduces a reaction rate of the strong acid with the carbonate containing formation.
A method, comprising:
- preparing a single-phase aqueous mixture comprising a strong acid and a water-soluble cationic polyacrylamide polymer, wherein the cationic polyacrylamide polymer is present in the aqueous mixture at a concentration of from about 0.05 g/100 mL to about 0.25 g/100 mL;
- and
- causing the aqueous mixture to contact a carbonate containing formation of a hydrocarbon reservoir, wherein the strong acid dissolves a portion of the carbonate containing formation, thereby creating one or more conductive channels within the formation, and wherein the cationic polyacrylamide polymer reduces a reaction rate of the strong acid with the carbonate containing formation.
A method, comprising:
- obtaining a single-phase aqueous mixture comprising a strong acid and a water-soluble cationic polymer, wherein the water-soluble cationic polymer is present in the aqueous mixture at a concentration of from 0.05 g/100 mL to 0.25 g/100 mL;
- and
- causing the aqueous mixture to contact a carbonate containing formation of a hydrocarbon reservoir, wherein the strong acid dissolves a portion of the carbonate containing formation, thereby creating one or more conductive channels within the formation, and wherein the water-soluble cationic polymer reduces a reaction rate of the strong acid with the carbonate containing formation.
Dependencies are inferred from the claim text.