WATER THERMODRILL FOR DRILLING WELLS IN ICE BODIES Russian patent published in 2018 - IPC E21B7/00 E21B7/14 E21C39/00 

FIELD: machine engineering.

SUBSTANCE: device contains a hollow body in the form of a pipe, to the upper end of which is attached a drill hose, supplying a hot water to the body, a drill bit is attached to the lower end of the body. The drill bit consists of a tip and a bush. The tip has a small parabolic sharpening about one centimetre in length from the outside and a conical bore inside. The bush with an axial hole along its entire length has a conical groove outside at the bottom and a conical groove inside, on the outside of the conical surface of the bush the rectangular grooves are cut in the form of thread. The tip is attached to the body by means of a thread. The bush is mounted coaxially in the tip. The conical surface of the bush enters the cone hole of the tip so that their ends are flush at the same level, while the grooves on the conical surface of the bush form channels for discharging water from the bit in the form of spread, swirling jets. The bush is pressed against the tip by means of a spring held in place by a nut screwed into the upper part of the tip and has a free move upward with increasing clearance between its outer conical surface and the inner conical surface of the tip.

EFFECT: sensitivity is increased to determine the position of the boundaries and the dimensions of voids in ice piles while maintaining a high drilling speed.

2 cl, 3 dwg