DEVICE FOR WELL BORING (VERSIONS) Russian patent published in 2009 - IPC E21B10/08 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to devices for well boring with implementation of roller-cutter bit. Device incorporates roller-cutter bit with rest, bottom drill collar tube, rest unloading unit in kind of wash over plate with circular flange forming friction pairs with reverse cones of roller-cutters, and unit of forced circulation running of roller-cutters. The unit is installed inside the bottom drill collar tube and made in form of an axial turbine. A shaft of the turbine is connected with the wash over plate. The rest is made in form of a rolling bearing composed of alternating steel balls of various diameters. Part of rolling bodies of smaller diameter is made with rubber coats the exterior diameters of which in initial position correspond to the exterior diameters of rolling bodies of bigger diameters. In the second version the rest is made in form of rolling bearing composed of rolling bodies. Part of them is made hollow out of tensile material. Hollow rolling bodies have radial channels and are partially filled with lubricating material, for example, with powder graphite.

EFFECT: reduced power consumption at rock destruction and also accelerated driving and mechanical rate of boring.

4 cl, 5 dwg