Rapid impact-scrapping and cutting combined type rock breaking PDC drill bit

Abstract

The invention discloses a rapid impact-scrapping and cutting combined type rock breaking PDC drill bit. The rapid impact-scrapping and cutting combined type rock breaking PDC drill bit comprises a drill bit body (1) and a connector (2). The rapid impact-scrapping and cutting combined type rock breaking PDC drill bit is characterized in that a plurality of knife wings are uniformly arranged on theouter surface of a crown of the drill bit body (1) in the circumferential direction, a plurality of cutting teeth (16) are arranged on the knife wings in the radial direction, and chip removal groovesare formed between the every two adjacent knife wings; a plurality of high-pressure nozzles (15) are arranged in the chip removal grooves, the high-pressure nozzles (15) are mounted on the surface ofthe drill bit body (1), and tapping of the lower ends of the high-pressure nozzles (15) are carried out to the inner wall of the drill bit body (1) to form a bypass flow channel; and an automatic continuous impact device is arranged in the drill bit body (1), the automatic continuous impact device comprises a bearing group (3), a turbine rotor (4), a bearing (5), a spring (6), an impact head (7)and a center cone gear (9), through holes are formed in the turbine rotor (4) and the impact head (7), and the through holes communicate with a threaded hole of the connector (2) to form a center flowchannel.

Description

technical field [0001] The invention relates to the field of drilling bits, in particular to a rapid impact-scraping composite rock-breaking PDC bit. Background technique [0002] At the beginning of the last century, the roller cone bit replaced the scraper bit in hard abrasive formations, but the disadvantage of this kind of bit in drilling shale and other plastic rock formations is mainly that the bottom hole mud bag is caused by the compression effect, and with the drilling depth and With the increase of the bottom hole pressure and the specific gravity of the mud, the mud bag phenomenon will be more serious. In order to solve this problem, various drill bit manufacturers have made various improvements to the roller cone bit over the years, but with little success. [0003] At the same time, considering that scraper bits or fixed cutter bits are less affected in this respect, people began to try to combine the two bits. With the popularization and application of PDC bi...

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