A kind of disc-type toothed roller bit

Abstract

The invention discloses a disk-shaped insert roller bit, belongs to the technical field of drilling equipment of oil and gas, mine engineering, building foundation engineering construction, geology, hydrology and the like, and particularly relates to a roller bit. The disk-shaped insert roller bit comprises a bit body and at least one roller, teeth are transversely inserted on the rollers, value range of a tooth crest deflection angle alpha of the transversely inserted teeth is larger than or equal to 70 degrees and smaller than or equal to 90 degrees, and cross sections of inserted portions of the transversely inserted teeth are semicircular. The disk-shaped insert roller bit provides a novel structure, and the teeth of the novel structure are acted on shaft bottom rocks in a way of rolling grinding and splitting, and particularly have unique advantages for drilling hard brittle stratum and hard abrasive stratum. Meanwhile, high rock splitting efficiency of the bit is guaranteed, the service lives of bit teeth and a bearing are prolonged, and accordingly, the service life of the roller bit is prolonged.

Description

technical field [0001] The invention belongs to the technical field of drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and specifically relates to a roller cone bit. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. The tri-cone bits currently used in drilling engineering include steel tooth drill bits (also known as milling tooth drill bits) and carbide tooth drill bits (also known as insert tooth drill bits). The steel tooth drill bit is directly milling the cutting teeth on the cone body. The teeth have low strength and poor wear resistance, and are generally used in soft formations; Tungsten carbide teeth (hereinafter referred to as cemented carbide teeth or teeth), the hardness and wear resistance of cemented carbide teeth are obviously better than steel teeth, and are generally used in hard ...

AI Technical Summary

Problems solved by technology

The three-cone bit mainly breaks rocks in the form of impact crushing, that is, the teeth break rocks by impacting, squeezing and scraping with a small amount of slippage on the rocks. The disadvantage is that the energy utilization rate is not high and the rock breaking efficiency is relatively low. Low, and during the working process of the drill bit, the impact on the bearing is large, and the dynamic load coefficient is large

Third, the cones of most tri-cone bits are offset. The purpose of the offset is that the cones cannot roll purely when they roll on the bottom rock and break rocks, so that the teeth on the cones slip when breaking rocks. Increase, the greater the offset value, the more obvious the tooth slipping and scraping on the gear, but at the same time, the wear caused by slipping is also greater

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