The article summarizes the results of the welltest and field data results which have proved spontaneous fracture growth in injection wells. Numerous experiments show induced fractures merging in linear development system. The cases of the hydrodynamic connection identification between the injection wells are given. Tracer analysis results obtained in the linear development system are presented. The injection well blowing allows to include it in the researching program as the control well and to take well production samples for studying. In the result of the tracer analysis there were no fixed tracers in the well production samples. 3D modeling of virtual tracer filtration was done to identify the reasons of tracer absence in well production samples. Modeling was implemented for several variants. In the first one virtual tracer propagation was considered in case of the actual mass injection. Hence, increase mass cases also were considered. Besides, modeling was done for porous medium bridge between fractured injection wells changes. It is shown that the tracer delivery in a row of injection wells in liner development system depends on injected tracer mass and distance porous medium bridge between fractured injection wells. It is advisable to plan and interpret tracer studies using a reservoir simulator at fields with fractured production wells and induced fractured injection wells.
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