METHOD FOR INERTIZATION OF FACE SPACE Russian patent published in 2007 - IPC E21F5/00 

FIELD: drilling-explosive operations in wells with hazard of explosion of methane-air mixtures and coal dust.

SUBSTANCE: in accordance to method, mass of inertia-inducing substance G_y is selected based on formula G_y=N_B[(R/2)²×L]g, grams, where: N_B - number of blast hole charges in face, R - distance between blast hole chares, L - depth of inertization zone, g - specific fire-suppressing ability of inertia-inducing substance. Time delay (T_MIN) between moment of activation of inertization device and moment of activation of blast hole charges is supposed to be not less than T_MIN=L/V, seconds, where V - speed of expansion of front of cloud of sprayed inertia-inducing substance.

EFFECT: increased reliability of inertization of face space from explosion of methane-air mixtures during drilling-explosive operations.

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