Method and tool for drilling and explosion well expansion in hard rocks

The paper represents the problem of expanding wells in hard and especially hard rocks. The general direction of solving this problem, theprevious methods of solving it and their shortcomings are shown. Anew method of drilling and blasting expansion of wells in strong and especially hard rocks is presented, using the energy of a directed explosion of low power to create a three-dimensional network of cracks in the rock mass around the well. The drawings ofthe tool for drilling and blasting expansion of wells in strong and especially hard rocks at the level of a draft design are given, and the calculation of the explosion energy of a single charge of explosives is carried out, and their mass necessary for such an explosion is determined.