Dual-phase acid-based fracturing 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.
Claims13
A dual-phase acid-based fracturing composition for use in matrix acidizing and acid-fracturing operations in oil and gas wells for the prevention of corrosion of well tubing and downhole equipment, the composition comprising;
- an acid phase comprising a strong acid operable to be diluted with treatment water and to dissolve formation rock;
- a hydrocarbon phase comprising a liquid hydrocarbon comprising 5 or more carbon atoms, wherein the composition comprises an acid-in-hydrocarbon emulsion;
- 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 the hydrocarbon phase of the composition, the hydrocarbon-soluble corrosion inhibitor comprising an alcohol;
- and
- an acid-soluble corrosion inhibitor present in the acid phase of the composition;
- where the strong acid during acid-based oil well operations forms a spent acid upon dissolving formation rock,
- where the composition is operable to coat metal tubing and well equipment with the hydrocarbon-soluble corrosion inhibitor such that the metal tubing and well equipment is protected from the acid during an injection phase, and
- where the composition is operable to coat the metal tubing and well equipment with the acid-soluble corrosion inhibitor such that the metal tubing and well equipment is protected from the spent acid during a flowback phase.
Dependencies are inferred from the claim text.