Multifunctional self-oscillation flow jet flow drill

A self-excited oscillating jet, multi-functional technology, applied in vibration drilling, liquid/gas jet drilling, etc., can solve the problems of short service life, shallow drilling depth, low work efficiency, etc., and achieve long drilling depth, Increased porosity and simple structure

CN101413380AInactive Publication Date: 2009-04-22CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-04-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a multifunctional self-oscillation jet drill bit. The prior similar product not only has shallow drilling depth and complex structure but also has large resistance loss and short service life of a drill bit, can not repeatedly switch drilling and groove cutting during the drilling process, and limits the application scope. A crushing blade and a valve body are arranged inside a cutting head body of the drill bit; a first offsetting spring in the valve body is matched with a valve core A in the form of sliding; a valve core B is matched with a second offsetting spring for operation under the action of a lined ring, a washer and the valve body together; and the valve core and a limber hole of the valve body are matched for use with a self-oscillation nozzle. The multifunctional self-oscillation jet drill bit adopts high-pressure water as power to realize repeated switching between drilling and groove cutting of coal seam and terrane, not only has a simple structure and is flexible to switch but also can promote development of coal seam fissure through oscillation jet generated by the nozzle, strengthens the permeability of the coal seam, improves the gas extraction rate, particularly has obvious effect on low-permeability coal seam, and widely promotes and applies the fluid technology of the high-pressure water in the fields of drilling and gas extraction of the low-permeability coal seam.
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Description

Technical field:

[0001] The invention relates to jet drill bit technology, in particular to a jet drill bit used for drilling and grooving of various rock formations and coal seams, and is especially suitable for drilling and grooving operations of various apertures in coal seam gas drainage of low-permeability coal seams. Background technique:

[0002] High-pressure water jet technology is a new technology developed. It crushes and cuts coal and rock formations through high-pressure water with high energy concentration to improve the permeability of coal and rock formations. At present, the operation mode of the hydraulic drill bit using high-pressure water jet technology is relatively simple, and the grooving operation cannot be performed continuously after the drill pipe is pushed into the hole. Chinese patent No. 03122735 is a hydraulic drill bit that can remotely control drilling, slotting and deviation correction. Although water jet drilling and grooving can be realize...

Examples

Embodiment Construction

[0034] combine Figure 1 to Figure 12 , the implementation of the multifunctional self-excited oscillating jet drill bit is now described:

[0035] The multifunctional self-excited oscillating jet drill includes a front end drill 1 with an axial nozzle 1-1 and a cutting head 2 with a radial nozzle 2-8.

[0036] combine image 3 and Figure 4 It can be seen that the cutting head 2 is a hollow structure that runs through front and back, and there are crushing blades 2-9 on the outer periphery of the tail of the cutting head. Both ends of the cavity are provided with a front-end filter sheet 2-1 and a rear-end filter sheet 2-11, see Figure 5 and Figure 11 , to prevent cinders around the multifunctional self-excited oscillating jet drill bit from entering the inside of the drill bit during the working process, and the front part is provided with a pressure-holding check valve core 2-2, see Figure 6 , to prevent the pressure water ejected from the axial nozzle 1-1 from flow...