METHOD FOR STAGED CONSTRUCTION OF PRIORITY PATH OF GAS MIGRATION IN COAL BED BOTTOM Russian patent published in 2019 - IPC E21F1/18 E21F7/00 

FIELD: mining.

SUBSTANCE: method of step-by-step construction of a priority path of gas migration in coal bed mine is used especially at step-by-step construction of gas migration routes inside and outside coal-rock massif in mine of the first developed bed of deep coal beds. First, the gas migration path is pre-formed in the mine depending on the degree of mining operations impact in the first developed formation, the construction and stabilizing method on the side of the rock of limited development in deep beds, and then using the method of pre-destructive wells directed by manual method to perform active construction respectively in outer space and outside the coal-rock massif for formation of priority gas migration paths. Ultimately, under the influence of stress caused by mining, system of priority gas migration paths connected to each other in mine is additionally formed. In the present invention, the stress caused by the mining operations and the active manual method are combined to implement the step-by-step construction of the "zone-place-zone" gas migration pathways in the mine first deep developed formation, thereby eliminating the difficulty of forming a gas migration path in the deep coal bed mine and the difficulty of efficient passage and concentration of gas. Centralized diversion and control of gas is facilitated.

EFFECT: present invention has high application value.

6 cl, 3 dwg