Drilling Core

Drilling screw auger means – is a steel tube, which is wound a spiral of steel strip. In appearance resembles a corkscrew auger or drill, which is drilled in the winter ice fishermen. Between a screw connected with the thread, hexagon or dowels. Auger drilling method is the destruction of species due to the rotation of the drill. Broken ground up the screw spirals up and removed from the wells.

The rise of rock in a spiral auger becomes possible due to the fact that the auger rotates faster than the breed. The friction force is removed rocks of the borehole wall rocks more friction on the steel screw, so the breed does not rotate with the screw and slide on it. Just as the nut on the bolt twisting, moving along the axis of the bolt is removed rock is moved along the axis of the screw up. Auger drilling method is best suited for drilling shallow wells in unconsolidated and soft rocks. Auger drill hole method 30-50 m. Drilling With rotary rotary drilling rock is destroyed by a rotating auger. Rotation on the drill is transmitted from the rotor, which is located at surface, with the help of drill pipe.

The rotary method allows you to drill wells with a diameter of 76 mm to 215 mm. If you are using bits of different diameter rotary drilling method allows inside casing. In order to consolidate borehole wall and to prevent from collapse, lowered into the well casing, and further drilling is carried out smaller-diameter drill bit. Core Drilling Core drilling method method is that rotating auger in the form of a ring destroys not breed around the bottom section but only at the edges. Broken ground washed washing liquid which is injected into a column of drill pipe with a pump. Inside (Core) remains inside the tubes. Periodically core tear from the bottom and lifted to the surface. Cable-way drilling in the most simple way to technologically advanced cable-drilling is that drill bit to raise the rope over the slaughter and then released. Chisel hits the bottom of the hole and destroy the rock, which is then removed with a bailer.

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