PDC drill bit adopting high-low pressure combined nozzles

• Main Authors: DU QILANG, LIU CHENGLIANG
• Format: Patent
• Language: Chinese; English
• Published: 23.06.2020
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention discloses a PDC drill bit adopting high-low pressure combined nozzles. The PDC drill bit comprises a connector (1) and a drill bit body (2), a plurality of cutter wings (3) are arrangedon the outer surface of a crown of the drill bit body (2) in the circumferential direction, a chip groove (4) is formed between every two adjacent cutter wings (3), and a plurality of low-pressure nozzles (5) are arranged in the chip grooves (4). A plurality of rows of cutting teeth (6) are arranged on the outer surfaces of the crowns of the cutter wings (3) in the radial direction, L-shaped steps(7) are arranged on the front cutter faces of shoulders of the cutter wings (3) in a stepped structure, and at least one high-pressure nozzle (8) is installed on the step faces of the L-shaped steps(7). According to the PDC drill bit, the high-pressure nozzles (8) and the low-pressure nozzles (5) are matched, so that cooling and flushing of the cutting teeth (6) at key parts of the drill bit arefacilitated, overall chip r