Abstract: The invention provides a method, composition, and system for inhibiting corrosion where the composition forms an acid-in-oil emulsion comprising hexamethylenetetramine, a corrosion inhibitor; and at least one emulsifier.

Abstract: The invention provides a method, composition, and system for inhibiting corrosion where the composition forms an acid-in-oil emulsion comprising hexamethylenetetramine, a corrosion inhibitor; and at least one emulsifier.

Abstract: A treatment fluid for use in a subterranean formation penetrated by the wellbore of a well includes: (i) water; (ii) a strong acid; and (iii) a branched viscoelastic surfactant having a hydrophobic portion with a total of 16 to 20 carbons; wherein the pH of the treatment fluid is less than 0.5; and wherein the viscosity of the treatment fluid is less than 5 cP at 40 sec-1. A method of treating a zone of a subterranean formation penetrated by a wellbore includes the steps of forming the treatment; (B) introducing the treatment fluid through the wellbore into the zone; and (C) allowing time for the strong acid in the treatment fluid to spend in the formation. Such a treatment fluid shows good rheological properties at temperatures above 93° C. (200° F.).

Abstract: A treatment fluid for use in a subterranean formation penetrated by the wellbore of a well includes: (i) water; (ii) a strong acid; and (iii) a branched viscoelastic surfactant having a hydrophobic portion with a total of 16 to 20 carbons; wherein the pH of the treatment fluid is less than 0.5; and wherein the viscosity of the treatment fluid is less than 5 cP at 40 sec?1. A method of treating a zone of a subterranean formation penetrated by a wellbore includes the steps of; (A) forming the treatment; (B) introducing the treatment fluid through the wellbore into the zone; and (C) allowing time for the strong acid in the treatment fluid to spend in the formation.

Abstract: A treatment fluid and method treating a zone of a subterranean formation penetrated by a wellbore. The treatment fluid includes: (i) water; (ii) a strong acid; (iii) a cationic viscoelastic surfactant; (iv) an anionic organic component having at least 4 carbon atoms; and (v) a non-cationic corrosion inhibitor; wherein the pH of the treatment fluid is less than 0.5. Preferably, the viscosity of the treatment fluid is less than 5 cP at 40 sec-1. The method includes the steps of: (A) forming the treatment fluid; (B) introducing the treatment fluid through the wellbore into the zone; and (C) allowing time for the strong acid in the treatment fluid to spend in the formation. Preferably, as the acid spends in the subterranean formation, the viscosity of the treatment fluid increases in the well to above 5 cP. Such a treatment fluid shows good rheological properties at temperatures above 93° C. (200° F.).

Abstract: A treatment fluid for use in a subterranean formation penetrated by the wellbore of a well includes: (i) water; (ii) a strong acid; and (iii) a branched viscoelastic surfactant having a hydrophobic portion with a total of 16 to 20 carbons; wherein the pH of the treatment fluid is less than 0.5; and wherein the viscosity of the treatment fluid is less than 5 cP at 40 sec-1. A method of treating a zone of a subterranean formation penetrated by a wellbore includes the steps of forming the treatment; (B) introducing the treatment fluid through the wellbore into the zone; and (C) allowing time for the strong acid in the treatment fluid to spend in the formation. Such a treatment fluid shows good rheological properties at temperatures above 93° C. (200° F.).

Abstract: Corrosion of steel is a major problem in acidizing operations in a well. A composition in the form of an emulsion is provided, the composition including: (i) a continuous oil phase; (ii) an internal aqueous acid phase adjacent the continuous oil phase; (iii) an emulsifier; (iv) a corrosion inhibitor; (v) a source of carboxylate ion selected from the group consisting of formic acid, oxalic acid, sodium formate, potassium formate, sodium oxalate, potassium oxalate, and any combination thereof; (vi) a source of iodide ion; and (vii) a source of cuprous ion. In addition, a method of acidizing a treatment zone of a subterranean formation penetrated by a wellbore of a well is provided. The method includes the steps of: (A) forming a treatment fluid comprising a composition according to the invention; and (B) introducing the treatment fluid into the well, wherein the design temperature is at least 280° F.