In a multilayer heterogeneous oil reservoir developed and exploited by water flooding, most of the remanant oil is distributed in the unflushed part of the developed reservoir. Improvement of the conformance factor and the displacement efficiency should be the main EOR technique. Profile modification in an injection well is an effective technique in the improvement of the volumetric sweep efficiency of the water flooding.

This paper gives a summary of the application of the profile modification technique in the injection wells in Chinese oil fields and its further development. Some examples on the effectiveness of this technique are presented and analyzed.

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