ENHANCED OIL RECOVERY PROCESS TO INJECT SURFACTANT-AUGMENTED LOW-SALINITY WATER IN OIL-WET CARBONATE RESERVOIRS

摘要

The present invention relates to a method to enhance oil recovery from a hydrocarbon reservoir. One aspect of the invention includes injecting low salinity water into the reservoir followed by the injection of a surfactant diluted in low salinity water, and alternating the injections of the low salinity water and the surfactant diluted in the low salinity water. The invention improves the effectiveness of the surfactant by reducing the salinity of the reservoir by injecting low-salinity water into the reservoir.

主权项

1. A method to enhance recovery of oil in a hydrocarbon reservoir, comprising:
injecting a low-salinity water into the reservoir; and injecting a surfactant diluted in an additional low salinity water, wherein the salinity of the additional low-salinity water is less than a salinity of the low-salinity water.