Nozzle for self-rotating jet drill with anti-stall device

Abstract

A spray head for a self-rotating jet drill bit with an anti-stall device, comprising a rotary spray head and a spray head anti-stall device, the rotary spray head includes a rotary spray head body, a diversion cavity is provided in the rotary spray head body, and a plurality of rock breaking devices are provided at the front end The nozzle hole is provided with a plurality of reaming nozzle holes in the middle, and a plurality of broken nozzle holes in the rear part. The anti-stall device of the nozzle includes a porous control shell, and the rear part of the porous control shell is a cylindrical structure. The middle part of the control shell forms an enlarged part with a gradually larger diameter from the cylindrical structure forward, and the front part of the porous control shell extends forward from the enlarged part and surrounds the rear part of the rotary nozzle body; the present invention is simple in structure, easy to operate and maintain, It can effectively overcome the problems existing in the current self-rotating jet drill bit, such as nozzle rotation stall and uncontrollable particle size of cuttings, and give full play to the combined scanning and breaking effect of multi-jet holes of the self-rotating jet drill bit to improve drilling efficiency and drilling length.

Description

technical field [0001] The invention relates to the technical field of stratum drilling, in particular to a nozzle for a self-rotating jet drill bit with an anti-stall device, which is suitable for the development fields of coal bed methane, oil, and natural gas. Background technique [0002] In the prior art, there is a self-rotating jet drill bit, which is a drill bit with a special structure derived from the theory of rotating jet flow. One or more groups of nozzle holes are placed obliquely on the nozzle, and the jet reflection is used to The recoil torque generated by the impact due to eccentricity realizes the automatic rotation of the nozzle. During the drilling construction, the nozzle rotates at a high speed, and multiple nozzle holes are combined with scanning rock breaking to form relatively regular large-diameter holes. [0003] Its disadvantages are: (1) When the rotary nozzle hits the front rock wall, it is prone to the problem of nozzle rotation stall, which l...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a nozzle for a self-rotating jet drill with an anti-stall device, which has a simple structure and is easy to operate and maintain, and can effectively overcome the problems of the current self-rotating jet drill, such as the stall of the nozzle rotation and uncontrollable particle size of cuttings. , give full play to the rock-breaking effect of multi-jet joint scanning of the self-rotating jet drill bit, and improve the drilling efficiency and drilling length

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