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US 10,703,957 B2Granted
Development of retarded acid system
AssigneeSaudi Arabian Oil Company
InventorsAbdullah Al-Yami, Vikrant Wagle, Ali Safran
Life of this patent
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Abstract
In one embodiment, a retarded acid system comprises an aqueous acid and a retarding surfactant. The aqueous acid may comprise from 5 wt. % to 25 wt. % of a strong acid, that is, an acid having a Ka greater than or equal to 0.01. The aqueous acid may further comprise from 75 wt. % to 95 wt. % water. The retarding surfactant may have the general chemical formula R—(OC2H4)X—OH where R is a hydrocarbon having from 11 to 15 carbon atoms and x is an integer from 6 to 10. The retarding surfactant may have a hydrophilic-lipophilic balance from 8 to 16.
Claims3
A retarded acid system comprising:
- an aqueous acid;
- the aqueous acid comprising:
- from 5 wt. % to 35 wt. % of one or more of HF, HClO4, HClO3, HCl, HBr, HI, HNO3, HO2C2O2H, H2SO4, and H2SO3;
- and
- from 65 wt. % to 95 wt. % water;
- and
- a retarding surfactant;
- the retarding surfactant having the chemical formula R—(OC2H4)X—OH, where:
- R is a hydrocarbon having from 11 to 15 carbon atoms;
- x is an integer from 6 to 10;
- and
- the retarding surfactant has a hydrophilic-lipophilic balance from greater than 10 to 16;
- where the ratio of the weight of retarding surfactant in the retarded acid system to the weight of the aqueous acid in the retarded acid system is from 1:25 to 1:5.
10 more elements
Dependencies are inferred from the claim text.