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US 12,600,901 B2Granted
Low viscosity polymer-based retarded acid
AssigneeSchlumberger Technology Corporation
InventorsJulia Fernandez Del Valle, Christopher Daeffler, Mohan Panga
Life of this patent
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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.
Claims17
A method of stimulating a hydrocarbon reservoir, the method comprising:
- preparing a single-phase aqueous mixture comprising a strong acid and a water-soluble polymer, wherein the water-soluble polymer is a polyalkylene glycol, a polyimide, a polyimine, a polyamide, a polyol, a polyanhydride, a polyoxazoline, or a mixture, copolymer, or multipolymer thereof, and wherein the water-soluble polymer is present in the aqueous mixture at a concentration of from 0.05 g/100 mL to 0.25 g/100 mL;
- flowing the aqueous mixture into a carbonate containing formation of a hydrocarbon reservoir;
- and
- contacting the carbonate containing formation with the aqueous mixture, wherein the strong acid dissolves a portion of the carbonate containing formation, thereby creating conductive channels within the formation, and wherein the water-soluble polymer reduces a reaction rate of the strong acid with the carbonate containing formation.
1 more element
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 0.05 g/100 mL to 0.25 g/100 mL;
- flowing the aqueous mixture into a carbonate containing formation of a hydrocarbon reservoir;
- and
- contacting the carbonate containing formation with the aqueous mixture, wherein the strong acid dissolves a portion of the carbonate containing formation, thereby creating conductive channels within the formation, and wherein the cationic polyacrylamide polymer reduces a reaction rate of the strong acid with the carbonate containing formation.
1 more element
A method, comprising:
- obtaining 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 0.05 g/100 mL to 0.25 g/100 mL;
- flowing the aqueous mixture into a carbonate containing formation of a hydrocarbon reservoir;
- and
- contacting the carbonate containing formation with the aqueous mixture, wherein the strong acid dissolves a portion of the carbonate containing formation, thereby creating conductive channels within the formation, and wherein the cationic polyacrylamide polymer reduces a reaction rate of the strong acid with the carbonate containing formation.
1 more element
Dependencies are inferred from the claim text.