PLUGGING DEVICE Russian patent published in 1996 - IPC

FIELD: drilling of boreholes. SUBSTANCE: plugging device has hollow container filled with grouting mortar where piston is placed. It divides space of body into chambers above and under piston. Device also includes generator of hydraulic pulses hydraulically coupled to chamber above piston and manufactured in the form of electric discharger. Discharger incorporates pulse current generator with charging and discharging circuits and branch pipe with working chamber. Branch pipe houses upper and lower check valves. First one communicates working chamber with chamber above piston. Electrodes are positioned in upper part of working chamber. Working chamber has drop-shaped outline with spherical surface of walls. Discharging circuit is located in branch pipe under working chamber. EFFECT: increased precision of installation of plugging device in plugging zone. 3 cl, 3 dwg