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AssigneeOoo Npp "Burintekh"
InventorsGniyatulla Garifullovich ISHBAEV, Andrej Grigorievich BALUTA, Artur Nailievich SHARIPOV
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The invention relates to rock destruction tools used for drilling oil and gas wells, especially for drilling slant and horizontal wells and formations having alternating layers of different hardness. The technical effect consist in improved steerability of the drilling bit and higher vibration resistance of polycrystalline diamond cutters (PDC) bit due to the use of a composite plating applied and adjustment of cutter protrusion over this plating. Blade drilling bit includes body with coupling thread, central channel, exit holes for flushing fluid and blades, equipped with polycrystalline diamond cutters PDC. Blade surface is covered with composite plating having different wear resistance depending on thickness, and tolerance of composite plating to abrasion wear increases from the outer surface to sublayers, and the size of cutter protrusion close to the centre of bit over the surface of composite plating is less than required for drilling the hardest formations in given geological section.
A blade drilling bit, comprising a body having a central channel and outlets for flushing fluid, and blades provided with polycrystalline diamond cutters (PDC), wherein the blades are coated with a composite coating having a variable abrasion resistance coefficient along its thickness, so that the inner coating layer has the higher abrasion resistance and the upper coating layer having the lower abrasion resistance, and wherein the cutters partially protrude above the surface of the coating.
A method for manufacturing a blade drilling bit having blades provided with polycrystalline diamond cutters, the method including the step of
Dependencies are inferred from the claim text.