Drill bit for ultra-high rotating speed drilling of deep hard stratum

Abstract

The invention relates to a tool for deep geological exploration coring, in particular to a drill bit for ultra-high rotating speed drilling of a deep hard stratum. The drill bit for ultra-high rotating speed drilling of the deep hard stratum comprises a drill bit body, one end of the drill bit body is fixedly connected with a connector, the other end of the drill bit body is fixedly provided witha plurality of drill bit matrixes which are evenly distributed along the circumference, an interval is formed between every two adjacent drill bit matrixes, and reinforced polycrystalline diamond cutting teeth are fixedly arranged on the working face of the drill bit matrixes. The drill bit for ultra-high rotating speed drilling of the deep hard stratum further comprises a plurality of gauge protectors fixedly connected with the side walls of the drill bit matrixes and the side wall of a rotary head body, the gauge protectors correspond to the drill bit matrixes one to one, the top ends of thegauge protectors are flush with the working faces of the drill bit matrixes, an interval is formed between every two adjacent gauge protectors, and a diversion water channel is further formed in eachgauge protector, and the top ends of the diversion water channels are flush with the gauge protectors. The drill bit for ultra-high rotating speed drilling of the deep hard stratum is rapid in heat dissipation, rapid in powder discharging, small in vibration and preventing stick-slip.

Description

technical field [0001] The invention relates to a tool for coring in deep geological exploration, in particular to a drill bit for ultra-high-speed drilling in deep hard formations. Background technique [0002] In deep exploration, researchers at home and abroad often use high-temperature-resistant high-speed turbo drills (2000rpm, linear speed up to 2.5m / s) with impregnated diamond bits to break rocks, but the actual effect is limited due to the difficulty of effectively loading the drill pressure . On this basis, researchers at home and abroad began to adopt the rock-breaking method of ultra-high speed (8000rpm, linear speed up to 10m / s), which improved the problem that the low drill pressure was difficult to penetrate into the formation, and greatly improved the rock-breaking efficiency. room achieved good results. [0003] The existing diamond-impregnated drill bits add uniform diamond particles into the drill bit matrix, and its essence is that small-grain diamonds a...

AI Technical Summary

Problems solved by technology

Therefore, the layout of impregnated teeth on the blade can only destroy the rock by grinding, and the excretion of cuttings is not smooth under high-speed operating conditions; and the ambient temperature in deep formations is too high. Due to the existence of geothermal gradients, deep formations (especially Abnormal geothermal areas) often have a high temperature above 240 ° C. The high temperature of the environment and the heat generated by the high-speed rotation of the drill bit to grind the rock work together. At this temperature, it is difficult for conventional artificial diamond to maintain the mechanical properties at room temperature, the brittleness increases significantly, and the service life of the drill bit is shortened. ;Due to the fact that the drill pipe is too long in deep hard formations, it is difficult to effectively load the WOB, and the rock-breaking ability of the drill bit is insufficient. Under the condition of ultra-high speed, stick-slip phenomenon will still occur, which will reduce the ROP; in addition, due to the application of ultra-high speed technology, Drill bits are prone to drill jumping, and the impact resistance of existing impregnated diamond drill bits is insufficient

These factors seriously restrict the efficient development of conventional impregnated diamond bits for deep geological resources.

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