DEVICE FOR HOLE BORING IN SOIL Russian patent published in 2013 - IPC E21B7/28 E21B10/26 

FIELD: construction.

SUBSTANCE: device for hole boring in soil comprises a screw leader with a conical screw blade, connected by a tubular shaft with exhaust holes, aligned perpendicularly to its axis, with an expander in the form of a body with a conical tip, equipped with a screw blade of the same pitch and winding as the blade of the screw leader, a hollow rod fixed to the body of the expander, on the other end of which there is a source of a gas dynamic pulse installed. The expander is made of several bodies with stepwise increasing diameters, equipped with a screw blade of the same pitch and direction as the screw blade of the leader connected to each other by tubular shafts of identical length with radial openings. The hollow rod is fixed to the expander's body, which is last in direction of boring.

EFFECT: reduction of maximum pressure of a gas dynamic pulse in a zone of well expansion, reduced risk of working area unsealing via the last body of an expander and soil discharge at low well laying depth, which will increase reliability and efficiency of operation of a proposed device.

1 dwg