One of the main problems in chemical treatments concerns the proper placement of the treatment fluids. Specifically, a very distorted inflow pattern may result after stimulation by matrix acidising treatments carried out without a means to distribute the injected fluids over the entire zone to be produced.

A theoretical and experimental study is reported aimed at developing a better understanding of the diversion process. This has resulted in practical guidelines for the application of chemical diverters in general and, in particular, for the use of benzoic acid and its derivatives.

The results of the current study also indicated some areas of uncertainties requiring further investigation.

It is concluded that benzoic acid can successfully be applied in matrix acid treatments in water injectors and gas wells.

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