LIGHT MOBILE HOSE-CABLE DRILLING UNIT FOR DRILLING OF BIG HOLES FOR WATER Russian patent published in 1998 - IPC

FIELD: water supply and amelioration; applicable in drilling holes of various purposes (bored piles, ventilation and mine timber-lowering shafts, prospecting, hydrogeological, etc) to depth of 100 m. SUBSTANCE: drilling unit has mast, winches, hose receiver with hose-cable roller system for passing hose-cable located on mast part, downhole motor, centrifugal pump in pair with vacuum pump, centrifugal self-priming pump, electric generator driven by chassis engine. The drilling unit is distinguished by the fact that instead of mud high-pressure pump for drilling slim holes with direct flushing, it is provided with low-pressure centrifugal pump coupled with vacuum pump, roller system for passing hose-cable located on mast lower part; downhole motor, hose-cable and centrifugal pump have similar flow areas for drilling big holes by accelerated method with reverse circulation of pure water. The invention allows combination of advantages of hose-cable drilling with virtues of accelerated drilling by method of reverse circulation. EFFECT: increased diameter of drilled holes, drilling speed and hole production of water. 2 dwg