ROLLER CUTTER OF BORE BIT (VERSIONS) Russian patent published in 2009 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: invention refers to rock destroying tool, particularly to equipment of roller cutters for boring of wells. The roller cutter of the bore bit consists of a case with elements of equipment in form of inserted hard alloy teeth. Also teeth at a peripheral crown are arranged in three rows. Working surface of the tooth from the end is made concave by 0.3…1.5 mm depending on shape and size of rock destroying top of teeth along the edge of the top and depending on properties of rock. Also the end of the working surface of the tooth can have rectangular or round shape. Projecting of teeth above the surface of the roller cutter of the medium row on the peripheral crown is 0.3…1.5 mm less, than projection of teeth of the other two rows.

EFFECT: increased efficiency of rock destroying and increased mechanical speed of boring on a whole due to increased efficiency of power transmission from tooth of bit to destroyed rock at bottomhole of well.

4 cl, 6 dwg