Compositions and methods for acid diversion during acid stimulation of subterranean formations
AssigneeSaudi Arabian Oil Company
InventorsRajendra Arunkumar Kalgaonkar, Qasim Sahu
Life of this patent
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Abstract
Treatment fluids for acid diversion during acid stimulation of a subterranean formation may include at least an acidizing fluid, a nanoparticle dispersion, and an activator. The treatment fluid may include from 40 weight percent to 70 weight percent acidizing fluid based on the total weight of the treatment fluid. The treatment fluid may include from 20 weight percent to 40 weight percent nanoparticle dispersion based on the total weight of the treatment fluid. The treatment fluid may include from 5 weight percent to 15 percent activator based on the total weight of the treatment fluid. Methods of treating a subterranean formation with the treatment fluids are also disclosed.
Claims20
A treatment fluid for acid diversion during an acid stimulation of a subterranean formation, the treatment fluid comprising:
- from 40 weight percent to 70 weight percent aqueous acidizing fluid based on the total weight of the treatment fluid;
- from 20 weight percent to 40 weight percent aqueous nanoparticle dispersion based on the total weight of the treatment fluid;
- and
- from 5 weight percent to 15 weight percent activator based on the total weight of the treatment fluid.
A treatment fluid for acid diversion during an acid stimulation of a subterranean formation, the treatment fluid comprising:
- from 40 weight percent to 70 weight percent acidizing fluid based on the total weight of the treatment fluid;
- from 20 weight percent to 40 weight percent nanoparticle dispersion based on the total weight of the treatment fluid;
- and
- from 5 weight percent to 15 weight percent activator based on the total weight of the treatment fluid, wherein the activator comprises one or more of poly(2-hydroxypropyl-1-N-dimethyl ammonium chloride), poly(2-hydroxypropyl-1-1-N-dimethyl ammonium chloride), poly[N-(dimethylaminomethyl)]-acrylamide, poly(2-vinylimidazolinium bisulfate), poly(diallyldimethylammoniumchloride), or poly(N-dimethylaminopropyl)-methacrylamide.
A method for acid diversion during an acid stimulation of a subterranean formation, the method comprising:
- introducing a treatment fluid to the subterranean formation, the treatment fluid comprising:
- from 40 weight percent to 70 weight percent aqueous acidizing fluid based on the total weight of the treatment fluid,
- from 20 weight percent to 40 weight percent aqueous nanoparticle dispersion based on the total weight of the treatment fluid, and
- from 5 weight percent to 15 weight percent activator based on the total weight of the treatment fluid,
- where a temperature of the subterranean formation causes interaction of the activator with the nanoparticle dispersion to increase the viscosity of the treatment fluid to create a barrier operable to divert subsequent fluids to other regions of the subterranean formation.
Dependencies are inferred from the claim text.