same zone are placed while maintaining pressure the difference is the rate at the new holes process is repeated until desired all zones are treating properly or maximum rate is achieved embodiments of the present invention also allow measurement of a diverter 39 s effectiveness in diverting stimulation and scale treatment fluids from a high permeability layer to a low permeability layer or from a high pressure zone to a low pressure zone or from a layer which has a higher fluid mobility to a layer which has a lower fluid mobility embodiments of the invention can also be used to evaluate the effectiveness or a diverter to place the injected chemicals more evenly across layers which have different properties and can affect chemical placement the method allows calculation of volume of fluid injected in the low perm layer vs the high perm layer or in the high pressure zone vs low pressure zone or in the layer where the fluid has a higher mobility vs layer where fluid has a lower mobility and the extent of clean up or flow back after the well is put back on production that is the different pressure profiles as illustrated by fig3 and 6 show how more perforations and or fractures influence the resulting observed pressure and provide a way to estimate flow profile and pressure along the wellbore the method allows calculation of volume of fluid injected in the low permeability layer vs the high permeability layer and the extent of clean up after the well is put back on production consider a stimulation treatment designed for two reservoir.