Double emulsified acids and methods for producing and using the same
AssigneeSaudi Arabian Oil Company
InventorsMohammed Habib AIKhaldi, Tariq Abdulsattar AIMubarak
Life of this patent
Estimating the term…
Abstract
Embodiments of the present disclosure are directed to double emulsified acids, specifically water in oil in water (W/O/W) double emulsions with an acidic interior water phase. The double emulsified acid may include two or more emulsifying agents. In addition to improving the stability of the emulsions, the emulsifying agents may help slow the acid reaction rate. The first emulsifying agent may have an HLB greater than 7 and the second emulsifying agent may have an HLB less than or equal to 7. Other embodiments are directed to methods for producing a double emulsified acid and methods for acidizing a carbonate formation including a double emulsified acid.
Claims9
A method for producing a double emulsified acid, the method comprising:
- introducing an aqueous acid to a first vessel;
- introducing an oil-based composition and a first emulsifying agent having an HLB greater than 7 to a second vessel;
- mixing the contents of the first vessel and the contents of the second vessel at a first shear rate to form an invert emulsion;
- mixing the invert emulsion with water and a second emulsifying agent with an HLB less than or equal to 7 at a second shear rate to form a double emulsified acid.
Dependencies are inferred from the claim text.