Patent ID: 6405812
Filing Date: 2002-06-18
Classification: E21B,E21D

Abstract:
A drilling tool for drilling bore holes in the ground, and for the removal of drilled material using an air-lifting process comprising a drilling tool head having a hollow drilling rod with an internal extraction channel to remove the drilled material from the top of the drilling tool head, said drilling tool head having a plurality of cutting elements on a bottom surface distributed over a cross section of said bottom surface, and one suction channel positioned at least closely adjacent to said bottom surface, said suction channel having a first end, a second end, two side walls extending therebetween, a suction opening and an inlet opening, said first end position off center of said drilling tool head and said second end position at least closely adjacent to an outer periphery of said drilling tool head, said suction opening positioned at least closely adjacent to said first end and providing fluid communication between said suction channel and said extraction channel, said inlet opening positioned at least closely adjacent to said second end and providing an entrance into said suction channel for a scavenger fluid to initially contact said drilled material and to radially move at least a portion of said drilled material to said suction opening, said cutting elements positioned outside said suction channel.