Abstract: A horizontal well may be refractured or reactivated by generating a geomechanical model to estimate the stress level in the formation; identifying zones with high, medium, and low stress levels in the formation; isolating existing fractures in the horizontal well; injecting a fracturing fluid into the well to create at least one new fracture in a zone with a low stress level and packing the created fracture with proppant to increase the stress level in the zone; isolating the at least one newly created fracture; initiating refracturing in the zone with the high and/or medium stress level; identifying a location of the refracturing crack in the zone with the high and/or medium stress level; and developing the refracturing crack and packing it with proppant.

Abstract: A method of refracturing in a horizontal well may comprise: generating a geomechanical model to estimate the stress level in the formation; identifying zones with high, medium, and low stress levels in the formation around the well based on the generated geomechanical model of the formation; isolating existing fractures in the horizontal well; injecting a fracturing fluid into the well to create at least one fracture in a zone with a low stress level and packing the created fracture with proppant to increase the stress level in the zone; isolating at least one fracture created at stage (d); initiating refracturing in the zone with the high and/or medium stress level identified at stage (b); identifying the location of the refracturing crack relative to the zones of high, medium, and low stress levels in the formation around the well; developing the refracturing crack and packing it with proppant. A method of reactivating an injection horizontal well is also provided.