Mixing rock breaking mechanisms and long-life mixing drill

Abstract

The invention discloses mixing rock breaking mechanisms and a long-life mixing drill. The mixing rock breaking mechanisms are characterized by comprising rolling rock breaking parts and fixed rock breaking parts. Concave portions are arranged on the fixed rock breaking parts. The rolling rock breaking parts are arranged in the concave portions in the mode that the rolling rock breaking parts can pivot relative to the fixed rock breaking parts. The rolling rock breaking parts comprise wheel bodies and rock breaking portions arranged in the circumferential directions of the wheel bodies. The ratio of the thicknesses D of the wheel bodies to the sizes d of the rock breaking portions in the thickness directions of the wheel bodies is larger than or equal to 1.1 and smaller than or equal to 4. The long-life mixing drill comprises a body. The at least one mixing rock breaking mechanism is arranged on the body. The rolling rock breaking parts are arranged in the concave portions of the fixed rock breaking parts, and the two side faces of the rolling rock breaking parts both make contact with the inner walls of the concave portions to take the axial anti-thrust and limiting effects on the rolling rock breaking parts. An axial locking device is not provided, and the risk that the rolling rock breaking parts drop down is reduced, so that the probability of occurring of downhole accidents is decreased, and accordingly precious tooth arranging space on the drill is saved.

Description

technical field [0001] The invention relates to the fields of oil and gas drilling engineering, mining engineering, building foundation engineering construction, geological drilling, tunnel engineering, hydrology and non-excavation technology, in particular to a hybrid rock-breaking mechanism and a long-life hybrid drill bit. Background technique [0002] In oil and gas drilling engineering, drill bits are usually used to break rocks, which are rock-breaking tools that break rocks to form wellbores. At present, the drill bits used in drilling engineering mainly include three-cone bits and PDC bits. The three-cone bits mainly break rock in the form of impact crushing. The ratio of rotation speed) is greater than 1. When the bit rotates and drills, the cone rotates fast, and the teeth on the cone form an impact crushing effect on the rock at the bottom of the well. The energy utilization rate is not high, and the rock-breaking efficiency is relatively low. PDC bits rely on hi...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a composite rock-breaking method for the cone-PDC hybrid drill bit, which has the problems of short cone bearing life, easy cracking of the cone shell, excessive space occupied by the cone, and still falling of the cone mechanism and a long-life composite drill bit

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