Imidazoline-based heterocyclic foamers for downhole injection
View Patent ↗Disclosed are imidazoline-based foamers and corrosion inhibitors for treatment of oil and gas wells for enhanced production. The invention also includes methods of foaming a fluid by introducing the disclosed foamers to oil and gas wells.
1. An imidazoline-based foaming composition consisting of:
(a) 25.3 weight percent of a cyclic quaternized foaming agent having a general formula:
wherein
R 1 is unsubstituted straight-chain alkyl having 2 carbon atoms;
R 2 is selected from substituted or unsubstituted branched, chain, or ring alkyl or alkenyl having from 1 to about 25 carbon atoms in its main chain; and
R 3 is —CH 2 —CH 2 —COOH;
(b) 14.4 weight percent of capryloyl/capryl amidopropyl betaine surfactant; and
(c) a mixture of isopropanol and water.
2. A method of foaming a fluid, the method comprising: adding an effective foam-forming amount of the foaming composition of claim 1 to a well as batch addition or continuously.
3. The method of claim 2 , including adding said foaming composition so that from about 10 to about 100,000 ppm of actives are present in the fluid.
4. The method of claim 2 , including adding said foaming composition so that from about 100 to about 20,000 ppm of actives are present in the fluid.
5. The method of claim 2 , including adding said foaming composition so that from about 200 to about 10,000 ppm of actives are present in the fluid.
6. The method of claim 2 , wherein the fluid is oil or gas and water.
7. A method of foaming a fluid, the method comprising: adding to the fluid an imidazoline-based foaming composition consisting of (i) 25.3 weight percent of a salt of a cyclic quaternized foaming agent, said foaming agent having a general formula:
wherein
R 1 is unsubstituted straight-chain alkyl having 2 carbon atoms;
R 2 is selected from substituted or unsubstituted branched, chain, or ring alkyl or alkenyl having from 1 to about 25 carbon atoms in its main chain; and
R 3 is —CH 2 —CH 2 —COO—; (ii) 14.4 weight percent of capryloyl/capryl amidopropyl betaine surfactant; and (iii) a mixture of isopropanol and water; and wherein M is any counterion.