LAYOUT OF DRILL STRING BOTTOM PART Russian patent published in 1997 - IPC

FIELD: drilling equipment for mining industry. SUBSTANCE: proposed layout of drill string bottom part is intended for intensive solution of deeply laid masses of rock salt with subsequent delivery of highly concentrated solution of salt to day surface and possible utilization in future of cavities thus created in Earth's crust. Attached to lower end of turbo-drill shaft is bracket with pivotally fastened blades in the form of second order levers with their centers of gravity displaced relative to axis of turbo-drill. With rotation of turbo-drill shaft, centrifugal force gradually raises blades to working (horizontal) position and after that they begin operate as centrifugal pump creating vortex which intensively crushes and dissolves salt which surrounds bore-hole. EFFECT: high efficiency. 1 dwg