| abstract |
The injectivity index of injection wells is increased by injecting 1-500 gallons of a micellar dispersion per vertical foot of oil-bearing formation followed by 1-500 gallons of acid per vertical foot of oil-bearing formation. The micellar solution also tends to clean the oil-bearing sand so that the acid can more effectively ''''work'''' on the formation. Water, e.g. 0.5-50 volumes per volume of acid, can be injected after the micellar dispersion and before the acid. After the acid is injected, normal injection of water can be continued. |