METHOD AND DEVICE FOR CONTROL OF COAL BED UPPER PART COLLAPSE AREA DUE TO APPLICATION OF TECHNOLOGY OF PULSED HYDRAULIC FRACTURING OF A FORMATION

摘要

FIELD: mining.;SUBSTANCE: invention relates to a method of controlling a section of a coal bed upper part collapse, in particular to a method and apparatus for controlling a collapsing area of an upper portion of a coal bed by applying a technology of pulsed hydraulic fracturing of a formation, which relate to the field of coal production technology application. Device in the present invention consists of a pulse pump with low feed and a common pump with high feed, which are controlled by means of a three-pass hydraulic distributor and a switching valve. First, a pump pulse path is connected in the structure, the pipeline of a high-pressure conventional pump is closed, the pulse channel closes after the end of the pulse fracture and an ordinary fracture channel opens. Method combines advantages of using methods of pulse and traditional hydraulic fracturing. First, formation of a network of cracks takes place in an array of coal by means of pulsed hydraulic fracturing of the formation. Further, using the method of traditional hydraulic fracturing of the high-movement formation, network of cracks continues to expand, structure of coal massif is sufficiently transformed, fragmentation of upper part of coal bed is reduced, and ability to collapse of this part of coal bed is increased.;EFFECT: using this method and device, in the upper part of the coal bed there can be formed a sufficient number of cracks, the upper part of the coal bed can be weakened, and also the ability to collapse the upper part of the coal bed and its crushing, design is convenient, adequate level of safety and reliability is achieved, and unproductive use of resources can be reduced.;9 cl, 7 dwg