Use of compounds of alkylamidobetaine type in assisted oil recovery, and microemulsions containing such compounds

摘要

Use in assisted oil recovery of compounds of alkylamidobetaine type corresponding to the general formula: <IMAGE> in which R<1> is a monovalent aliphatic hydrocarbon radical with 7 to 23 carbon atoms, R<2> and R<3> are saturated monovalent aliphatic hydrocarbon radicals with 1 to 4 carbon atoms, n is an integer from 2 to 4 and m an integer from 1 to 5. These compounds are employed to form aqueous solutions of varied concentrations as well as microemulsions, to be injected into oil deposits.