Abstract: This method relates to the fields of mining, specifically oil, gas and hydro-geological industries and is intended for relief of tangential stress which originates in well side areas of producing formation from underground pressure by means of cutting vertical slot-shaped seats in well side zones of producing formation. The determined task is solved by introducing essential changes into the known method of constructing slot-like key seats from the well wall inside the rock consisting of generation of hydro-abrasive jet, its transportation to the perforator's nozzle, which is lowered into the well inside the casing pipe and directed towards the rock, and the nozzle's travel along the surface of the forming seat.

Abstract: A system for increasing the productivity of oil, gas and hydrogeological wells has means for cutting slots only in a near well zone so as to perform a partial unloading of the well and to remove a part of support stresses, and means for cyclically treating well with a formation-treating substance so as to remove a remaining part of the support stresses, with controlling a density of a formation and correcting the cyclical treatment in correspondence with the density of the formation.

Abstract: A method of increasing the productivity of oil, gas and hydrogeological wells has the steps of performing a slot unloading, providing a cyclical treatment of a near well zone with a formation-treating substance, with a use of cutting slots, determining a region to be treated, selecting a corresponding volume of a treating technological composition, and introducing the volume into a formation to be treated, and subdividing the method into a two stages including a first stage performed by a partial slot unloading of a near well zone so as to remove a main part of support stresses, and a second stage of removing a remaining part of support stresses by a cyclical treatment of the well with a formation-treating substance with control by the density of the rock to be treated and performing a corresponding correction.

Abstract: A method of increasing the productivity of oil, gas and hydrogeological wells has the steps of performing a slot unloading, providing a cyclical treatment of a near well zone with a formation-treating substance, with a use of cutting slots, determining a region to be treated, selecting a corresponding volume of a treating technological composition, and introducing the volume into a formation to be treated, and subdividing the method into a two stages including a first stage performed by a partial slot unloading of a near well zone so as to remove a main part of support stresses, and a second stage of removing a remaining part of support stresses by a cyclical treatment of the well with a formation-treating substance with control by the density of the rock to be treated and performing a corresponding correction.

Abstract: The material, according to the present invention, based on a Zr contains also the following components, on a weight percent basis: 0.5 to 1.5 Nb, 0.9 to 1.5 Sn, 0.3 to 0.6 Fe, 0.005 to 0.2 Cr, 0.005 to 0.04 C, 0.05 to 0.15 O, 0.005-0.15 Si, Zr being the remainder. The proposed product used in the core of nuclear reactors and made from the aforementioned material, features a microstructure which is essentially a zirconium matrix strengthened with particles of the stannfferous and ferriferous intermetallides; at least 60 volume percent of a total amount of the ferriferous intermetallides falls on the particles of the intermetallides of the type of Zr(Nb,Fe).sub.2, Zr(Fe,Cr,Nb), and (Zr,Nb).sub.3 Fe, with the interparticle distance from 0.20 to 0.40 m.