The effectiveness of matrix acid stimulation treatments is limited in widely varying permeability zones due to poor diversion. A unique combination of nitrogen foam, oil-soluble resins and HEC diversion agents was developed to ensure complete acid contact throughout the multiple layer zones in a gravel packed offshore Gulf Coast Louisiana well. Through the use of radioactive tracers and on-line pressure monitoring of the tubing and annulus, onsite adjustment of diverter concentration at various points during the treatment was achieved. The diversion of acid throughout these widely varying permeability zones was proven effective based on two logging runs and observed surface pressure responses. The case history with supporting data is included in the paper.

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