DEVICE FOR WELL BORING (VERSIONS) Russian patent published in 2009 - IPC E21B10/00 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to devices for well boring with implementation of roller-cutter bit. The device incorporates roller-cutter bit with rest, bottom drill collar tube, rest unloading unit in kind of wash over plate with a circular flange forming friction pairs with reverse cones of roller-cutters, and unit of forced circulation running of roller-cutters, installed inside the bottom drill collar tube .The unit is made in form of an axial turbine, a shaft of which is connected with the wash over plate. The exterior surface of the friction bearing from the not loaded side is installed with a gap relative to the interior surface of the roller cutter at arranging the rest of the roller cutter bit with implementation of the locking ball rolling bearing together with the friction bearing. The locking bearing is composed of balls part of which is coated with rubber coat (rubberised). In the second version the locking bearing is composed of balls part of which is hollow and made out of tensile material. Solid and hollow bodies are alternately arranged next nearest. Walls of hollow rolling bodies have radial channels, cavities of which are partially filled with lubricating material.

EFFECT: increased efficiency of roller cutter bit operation.

7 cl, 7 dwg