Back to results
US 8,039,422 B1Granted
Method of mixing a corrosion inhibitor in an acid-in-oil emulsion
AssigneeSaudi Arabian Oil Company
InventorAli A. Al-Zahrani
Life of this patent
Estimating the term…
Abstract
An acid-in-oil emulsion having a corrosion inhibitor as the external phase has been found to prevent downhole corrosion when acidizing carbonate formations to enhance hydrocarbon recovery.
Claims4
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.
2 more elements
Dependencies are inferred from the claim text.