Investigation of the reverse channel of information transmission “charge-wellhead” during drilling and blasting

The article describes a method for organizing a wireless communication channel between a charge activation device located in a ground well at a depth of 25 m and a seismic station on the surface. The channel from the well to the ground surface will allow transmitting service data and response commands to the activation signal to the receiving path of the seismic station to eliminate lost charges and confirm the activation of working charges. It is necessary to develop a method and determine the operating frequencies of the channel in soil conditions (dry and watered), taking into account the limitation of the transmitter and antenna by the linear dimensions of the well (diameter no more than 80 mm). The design of the actuating device, as well as the receiving/transmitting antenna, is described, measurements of the magnetic field strength at a distance from it at frequencies of 20-100 kHz. The measurement results were used to estimate the strength of the vertical component of the magnetic field in absorbing media with electrical properties of soils.