US 11,459,501 B2 · Chelating acid blends for stimulation of a subterranean formation, methods of utilizing the chelating acid blends, and hydrocarbon wells that include the chelating acid blends

Abstract

Chelating acid blends for stimulation of a subterranean formation, methods of utilizing the chelating acid blends, and hydrocarbon wells that include the chelating acid blends are disclosed herein. The chelating acid blends include an acid mixture and a chelating agent or set of chelating agents. The acid mixture includes hydrochloric acid and hydrofluoric acid. The methods include providing the chelating acid blends to a wellbore of a hydrocarbon well, flowing the chelating acid blends into a subterranean formation, dissolving a fraction of a formation mineralogy of the subterranean formation with the acid mixture, and chelating poly-valent metal ions with the chelating agent. The hydrocarbon wells include a wellbore that extends within a subterranean formation, a downhole tubular that extends within the wellbore, a fracture that extends into the subterranean formation, and a chelating acid blend positioned within the fracture.

Claims16

Dependent claims

A chelating acid blend formulated to stimulate a subterranean formation having a formation mineralogy, the chelating acid blend comprising:

an acid mixture including:
(i) hydrochloric acid, wherein the hydrochloric acid comprises at least 5 weight percent of the chelating acid blend;
and
(ii) hydrofluoric acid, wherein the hydrofluoric acid comprises at least 0.5 weight percent of the chelating acid blend;
a chelating agent selected from one or more amino acids having at least one primary amine, the amino acid selected from the group consisting of alanine, leucine, aspartic acid, glutamic acid, arginine, lysine, glycine, and any combination thereof;
and
a coating material that encapsulates the acid mixture and the chelating agent, wherein the coating material is configured to dissolve within hydrocarbon fluids.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/166,053Filed 3 Feb 2021 · us provisional application

Priority

17 Apr 2020

Published

US 2021/0324260 A121 Oct 2021

Granted

4 Oct 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C09K 8/74
Eroding chemicals, e.g. acids: combined with additives added for specific purposes
C09K 8/528
Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning: inorganic depositions, e.g. sulfates or carbonates
C09K 8/78
Combined with additives added for specific purposes: for preventing sealing
C09K 8/86
Compositions based on water or polar solvents: containing organic compounds

Chelating acid blends for stimulation of a subterranean formation, methods of utilizing the chelating acid blends, and hydrocarbon wells that include the chelating acid blends

Life of this patent

Chelating acid blends for stimulation of a subterranean formation, methods of utilizing the chelating acid blends, and hydrocarbon wells that include the chelating acid blends

Life of this patent

Abstract

Claims16