Autonomous and efficient torque-constant and pressure-constant rock breaking tool

Abstract

The invention discloses an autonomous and efficient torque-constant and pressure-constant rock breaking tool. The rock breaking tool is characterized by comprising an outer casing, an inner casing, a mandrel and a transmission shaft, wherein a turbine, a first bearing and the inner casing are sequentially mounted on the mandrel from top to bottom; a link bearing, a torsional spring, an upper inertia hammer, an upper partition board, a hydro-hammer, a lower partition board, a lower inertia hammer and a second bearing are mounted sequentially on the transmission shaft from top to bottom; the transmission shaft is sleeved with the hydro-hammer; two radial fixing blocks are further mounted between the upper partition board and the lower partition board and are fixedly mounted on the inner casing; the hydro-hammer is matched with the fixing blocks to form two pairs of high-pressure cavities and low-pressure cavities; an end ring is screwed at the lower end of the inner casing and connected with the transmission shaft through a spline in a clamping manner. The turbine with fewer stages is taken as a power tool, and pressure loss is little; the hydro-hammer is pushed by flowing slurry to knock the fixing blocks, a drill bit is knocked, and rock can be easily broken by the drill bit.

Description

technical field [0001] The invention relates to a drilling device, in particular to an autonomous rock-breaking tool with constant torque and constant pressure and high efficiency. Background technique [0002] At present, during the drilling process, the drill pipe is very long, the wellbore is curved, the curvature is large, the friction between the drill pipe and the well wall is very large, and the drilling pressure added by the drill pipe to the drill bit is reduced, especially in large deviations. For high-degree wells and horizontal wells, the phenomenon of supporting pressure is very serious, which seriously restricts the drilling speed. The connection between the drill bit and the drill pipe is rigid, and the formation is not uniform. When the drill bit is subjected to abnormal impact force from the formation, it is easy to cause premature wear of the cutting teeth of the drill bit, reduce the drilling speed and increase the drilling cost. Contents of the invent...

AI Technical Summary

Problems solved by technology

The connection between the drill bit and the drill pipe is rigid, and the formation is not uniform. When the drill bit is subjected to abnormal impact force from the formation, it is easy to cause premature wear of the cutting teeth of the drill bit, reduce the drilling speed and increase the drilling cost.

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