METHOD FOR REDUCTION OF EXCESSIVE ELASTIC ENERGY IN DEEP SEISMIC DANGEROUS SEGMENTS OF FRACTURES Russian patent published in 2021 - IPC G01V9/00 G01V1/00 

FIELD: physics.

SUBSTANCE: invention relates to seismic geology and is intended for controlled reduction of engineering-seismic risk, to prevent earthquakes by smooth wave hydraulic effects of liquid pressure on fractured reservoirs-headers in separate segments of the earthquake-prone main fault through the directional multi-hole deep wells with horizontal termination. Performing target drilling of multi-hole wells with side bores in segments of high-strength main tectonic shift across the strike of main fracture systems and performing wave hydraulic actions initiating smooth shifts of fracture wings in shear creeping mode. Group of deep multi-hole wells with side bores constructed according to the described algorithm will make it possible to repeatedly carry out wave hydraulic actions of any duration from the first day to several years for the purpose of controlled discharge of accumulated subsurface energy. Purpose of the actions is the relaxation unloading of the detected potentially seismically active fracture segments, which enables to reduce the excess level of elastic energy to a safe level for a long period of time (tens-hundreds years) in the safe mode of moderately accelerated sliding.

EFFECT: prevention of strong and catastrophic earthquakes by means of gradual reduction of accumulated excess deformations and seismotectonic subsurface energy confirmed by deformation and seismological measurements in separate segments of high-strength main fracture to safe background level, thus achieving a relaxation effect on time intervals of many tens-hundreds of years and more.

1 cl, 8 dwg