Insert cone bit

Abstract

The invention discloses an insert cone bit, belongs to the technical field of drilling equipment for petroleum and natural gas, mine engineering, building foundation engineering construction, geology, hydrology and the like, and particular discloses a cone bit. The insert cone bit comprises a bit body and at least one cone, transversely inserted teeth are inserted and fixed on each cone, and a value range of a tooth crest deflection angle alpha of each transversely inserted tooth satisfies that 70 degrees </=alpha</=90 degrees. By the provided novel structure, the teeth in the structure are acted on shaft bottom rock in a rolling grinding and splitting manner, the insert cone bit has unique advantages particularly for drilling of hard and brittle formations and hard abrasive formations, high rock-breaking efficiency of the bit is guaranteed while service lives of the bit teeth and bearings are prolonged, and further service life of the 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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