Gas injection enhances recovery from polymer flood pilot

A field pilot showed that gas polymer, two-phase flooding could increase oil recovery from a low and intermediate permeable reservoir.The combination of natural gas and polymer injection recovered about 10% more oil than with polymer injection alone after optimizing such parameters as the preflushing slug volume, polymer molecular weight, and injection rate. Because it has high mobility, natural gas can enter low permeability zones into which polymer cannot.Other benefits seen from the test was a decrease in water cut in some oil-producing wells and the need to inject less polymer because natural gas replaced some polymer. Click here to enlarge imageFig. 1 shows the injection scheme in t...

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