METHOD OF SHOCK WAVE DESTRUCTION OF COAL SEAM THROUGH WELLS DRILLED FROM EXCAVATION Russian patent published in 2015 - IPC E21F7/00 E21B43/26 

FIELD: mining.

SUBSTANCE: proposed method comprises creation of fractures in coal seam by cyclic increase and decrease in fluid pressure in well and affecting the seam by low-frequency high-amplitude pressure pulses at fluid pressure increase in the well. Note here that connection of wellhead via fast-response valve with pressurized water source and with drain valve. Said fast-response valve is opened for time interval sufficient for water wave to reach the most remote section of the well and to develop hydraulic shock so that forming fractures of coal seam are developed. Then, said valve is closed to decrease water pressure to initial value. Note here that duration of valve opening and frequency of hydraulic shock repetition are selected to allow sufficient fracture formation, coal formation destruction and filling of the most remote well section with fragments of destructed coal seam. Hydraulic shocks are repeated unless well is filled with said fragments to its wellhead.

EFFECT: development of uniform system of fractures, accelerated destruction of coal seams at minimum application of equipment.

1 dwg