Patent ID: 8039422
Filing Date: 2011-10-18
Classification: C09K,C23F,E21B,Y10S

Abstract:
1. A method of inhibiting the corrosion of oil-well tubing in a well-bore in a carbonate formation when using acid stimulation to enhance hydrocarbon recovery, which comprises: mixing an emulsifying agent with a hydrocarbon to form an emulsion; adding an acid with mixing to the emulsion to form an acid-in-oil emulsion; adding a corrosion inhibitor to the acid-in-oil emulsion whereby said corrosion inhibitor forms an external phase and the acid is encapsulated as the internal phase of the emulsion; and, delivering said acid-in-oil emulsion to the well-bore whereby the corrosion inhibitor in its external phase disperses on the well-tubing and the acid in the emulsion stimulates hydrocarbon recovery from the carbonate formation.