Split type tri-cone drill

Abstract

The invention relates to a split type tri-cone drill which is mainly composed of a first cone set, a second cone set, a third cone set, teeth, bit legs, an oil storage compensation pressure balance system and a spraying nozzle. The three bit legs are separately connected to three cone lower bodies through biased bit-leg journals at the lower ends of the three bit legs. Three cone upper bodies areseparately installed on journals of the three cone lower bodies. During operation, the three cone lower bodies separately orbit with a drill body and rotate around the bit-leg journals; and the threecone upper bodies separately orbit with the drill body and rotate around journals of the three cone lower bodies, the task of scraping and crushing rocks is achieved, so that the tooth scraping efficiency of a small end tooth ring and a middle tooth ring is improved, and the rock crushing efficiency of the drill is improved.

Description

technical field [0001] The invention relates to a split type tri-cone drill bit used for oil, natural gas drilling and other geological drilling. Background technique [0002] In oil drilling, the most widely used drill bit that can adapt to various formations so far is the roller cone bit. The most widely used roller cone bit is the tricone bit, which is widely used in oil, natural gas drilling and other geological drilling. With the further development of petroleum resources, the number of oil wells that can be exploited by conventional drilling is getting less and less, and the difficulty of mining is becoming more and more difficult. Drilling has gradually developed to deep wells and ultra-deep wells. Improving the rock-breaking efficiency of tri-cone bits is the key to improving drilling Key technical issues of efficiency. [0003] When the three-cone bit drills rock, it crushes and impacts through the interaction force between its cone rotation and the rock to achiev...

AI Technical Summary

Problems solved by technology

At present, most of the three-cone bits that have been used in actual production have only one cone body installed on the palm, that is, the cone body has only one rotation speed when it rotates around the journal of the tooth palm, resulting in a The tooth scraping efficiency of the end ring gear will show certain rules: the tooth scraping efficiency of the small end ring gear is the lowest, the tooth scraping efficiency of the large end ring gear is the highest, and the tooth scraping efficiency of the middle ring gear is between the two, which will Impact on rock breaking efficiency of tri-cone bit

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