REHYDROFRAC EFFECTIVENESS CONTROL BY HYDRODYNAMICAL SURVEYS
Opportunities for carrying out downhole hydrodynamical surveys in the course of assessment of the effectiveness of a rehydrofrac in a low-permeability formation have been considered. A drain zone size has been found to be the main criterion for the effective hydrofrac in case of generation of a differently oriented backup fracture in the formation. The greater zone size has been most probably caused by a non-linear filtration due to the occurrence of an initial shift gradient. The pressure field simulation (taking the above factor into account) has allowed the simulation of the real behavior of the downhole hydrodynamical survey curves in case of the rehydrofrac