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US 10,329,477 B2Granted
Dual-phase acid-based fracturing and stimulation fluids composition with corrosion inhibitors and method of use thereof
AssigneeSaudi Arabian Oil Company
InventorsSaleh H. Al-Mutairi, Yaser K. Al-Duailej, Ibrahim S. Al-Yami, Abdullah M. Al-Hajri, Hameed H. Al-Badairy
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Abstract
A dual-phase acid-based fracturing composition with corrosion inhibitors and method for use in acid-based matrix and fracturing operations in oil and gas wells is provided. The composition includes an acid, a hydrocarbon, a hydrocarbon-soluble corrosion inhibitor, an acid-soluble corrosion inhibitor, and an acid-soluble inhibitor aid.
Claims11
A method for inhibiting acid corrosion in matrix acidizing and acid fracturing applications in an oil and gas well, the method comprising the steps of:
- preparing a dual-phase acid-based fracturing composition comprising:
- a strong acid operable to be diluted with treatment water and to dissolve formation rock;
- a liquid hydrocarbon comprising 5 or more carbon atoms;
- an emulsifier selected from the group consisting of an amine-based surfactant, linear alkyl amines and alkyl ammoniums;
- a hydrocarbon-soluble corrosion inhibitor present in a hydrocarbon phase of the composition, the hydrocarbon-soluble corrosion inhibitor comprising an alcohol;
- and
- an acid-soluble corrosion inhibitor present in an acid phase of the composition;
- and
- injecting the composition into the oil and gas well to cause fracturing, etching, or a combination thereof in the formation rock;
- wherein the corrosion inhibitor present in the hydrocarbon phase of the dual-phase fracturing composition will be spent during an injection of stimulation fluids and the corrosion inhibitor present in the acid phase will be spent during the flowback.
7 more elements
Dependencies are inferred from the claim text.