Impacting and rotary-cut combined rock breaking tool

Abstract

The invention discloses an impacting and rotary-cut combined rock breaking tool, which comprises a rotary drill bit (1) which is connected with a shell (51) of an impactor, wherein one end of the rotary drill bit (1) is a drill bit working end (11), and the other end of the rotary drill bit (1) is a drill bit connecting end (12); an impacting bore bit (2) is arranged in the rotary drill bit (1), penetrates through the center of the rotary drill bit (1) and can do reciprocating motion along the direction of the axis of the rotary drill bit (1); the impacting bore bit (2) is in a cylindrical shape; a hammer (52) of the impactor can push the impacting bore bit (2), so that the working end (21) of the impacting bore bit penetrates through the drill bit working end (11); and the projected area of the working end (21) of the impacting bore bit is 4 to 10 percent of that of the drill bit working end (11) on a plane which is perpendicular to the axis of the rotary drill bit (1). According to the impacting and rotary-cut combined rock breaking tool, at the drill bit working end, the area which is occupied by the impacting bore bit is small, and the area which is occupied by the rotary drill bit is large, so that energy can be centralized to impact rock formations, the strength of the rotary drill bit is also improved, the service life of the rotary drill bit is prolonged, and the rock breaking efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of drilling equipment, in particular to a percussive peeling composite rock breaking tool used in petroleum drilling. Background technique [0002] In oil and gas drilling, when the drill bit encounters a hard formation, it will "slip" and it is difficult to break the rock, resulting in low drilling efficiency, short bit life, and a substantial increase in drilling time and drilling costs. In order to change this defect, Chinese Patent CN 102251743A, published on November 23, 2011, "A Percussion Rotary Drilling Method", this method uses a method of combining a drill bit with an impactor to make the drill bit rotate while drilling At the same time, it can also hammer the rock formation, which improves the drilling efficiency. [0003] However, when the above method is used, because the drill bit performs impact and rotary cutting operations at the same time, the drill bit receives a relatively large force, which le...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the rock-breaking efficiency of the impact body of the drill bit is low and the rotating body is easy to wear, the present invention provides an impact rotary cutting composite rock-breaking tool. Occupying a small area, not only can the energy be concentrated on breaking rocks, but also can reduce the wear of the drill bit and prolong the service life of the drill bit

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