US 12,247,166 B2
Drag reducing agent for emulsified acids
Enrique Antonio Reyes, Houston, TX (US); Kristina Henkel Holan, Houston, TX (US); Antonio Recio, III, Houston, TX (US); and Nicole Mast, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Sep. 6, 2023, as Appl. No. 18/242,651.
Claims priority of provisional application 63/502,160, filed on May 15, 2023.
Prior Publication US 2024/0384161 A1, Nov. 21, 2024
Int. Cl. E21B 43/27 (2006.01); C09K 8/64 (2006.01); C09K 8/74 (2006.01)
CPC C09K 8/74 (2013.01) [C09K 8/64 (2013.01); E21B 43/27 (2020.05); C09K 2208/28 (2013.01)] 11 Claims
 
1. A method comprising:
mixing a water-in-oil emulsified acid comprising:
an oleaginous phase;
an aqueous phase;
an acid, wherein the acid comprises at least one acid selected from the group consisting of hydrochloric acid, hydrobromic acid, hydroiodic acid, nitric acid, nitrous acid, methane sulfonic acid, alkyl or aryl sulfonic acids, formic acid, acetic acid, phosphoric acid, chloroacetic acid, dichloroacetic acid, oxyhalide wherein the oxyhalide is any oxide of fluoride, chloride, bromide, and iodide, and any combination thereof; and
an oil-soluble drag reducing agent, wherein the oil-soluble drag reducing agent comprises at least one species selected from the group consisting of a mega-supra-molecule (MSM), an emulsion shear-thinning enhancer (ESE), and combinations thereof; wherein the water-in-oil emulsified acid has a pH from about 0.01 to about 3.0; wherein the water-in-oil emulsified acid has an original viscosity;
pumping the water-in-oil emulsified acid into a wellbore penetrating a subterranean formation through perforations;
allowing a recovery of the original viscosity of the water-in-oil emulsifier acid after pumping it through the perforations; and
flowing at least a portion of the water-in-oil emulsified acid into the subterranean formation.