| 摘要 |
FIELD: mining, particularly to create cracks by hydraulic rock fracturing via well to break hardly-caving roof, to degas coal bed and to control deflected mode of rock massif near mine. ^ SUBSTANCE: device comprises hollow body with axial channel for working fluid supply, thread to connect the body to high-pressure pipe string and annular extension made on outer surface thereof. The annular extension is adapted to support one end of bush coaxial to the hollow body. The hollow body and bush may define space filled with hardening material, which expands as it passes to solid state. Washer-shaped lid is screwed on hollow body end from another end of the bush so that the lid rests upon the bush. The washer-shaped lid is provided with initiating slot connected with axial working liquid supply channel. Thread is made on hollow body end brought into contact with hardening material. ^ EFFECT: increased efficiency due to decreased labor inputs for device installation, reduced drilling work content, possibility of well sealing without the use of equipment for sealing bush crashing and pressing. ^ 3 cl, 2 dwg |
