Multi-purpose cooperative rotary cut radial self-rotation slit type inner concave multi-blade coreless drill bit

Abstract

The invention relates to a multi-purpose cooperative rotary cut radial self-rotation slit type inner concave multi-blade coreless drill bit, which is applicable to lubricating and cooling the drill bit and automatically drilling holes in a drilling process of a complex geological structure and has high drilling efficiency, long life and high applicability. The multi-purpose cooperative rotary cut radial self-rotation slit type inner concave multi-blade coreless drill bit comprises a special alloy crown part, and a diamond composite sheet is additionally arranged, so the wear degree of steel can be effectively relieved, the consistency in aperture is guaranteed, and the phenomenon of shrinkage is avoided. The high-pressure water jet of the drill bit is very beneficial for assisting in the drilling efficiency; the drilling diameter of the water jet is larger than the drilling diameter of the conventional mechanical rotary cut drilling, and the aperture of a soft coal seam at a local area can be increased by 20-30 times. The drill bit can be used for performing other drilling construction processes in combination with product characteristics when water circulates through a region drilled to meet the requirement of the process in a cut joint outside a fracturing breakage region, a hole collapse region, a hole blockage region, a gas accumulation region and a region with coal blast and spray holes, and the construction is integrally performed to save time and labor.

Description

technical field [0001] The invention belongs to the field of coal drilling engineering, mining, geological drilling and other technical equipment, and is mainly used in coal mine underground, gas drainage holes, water exploration holes, grouting holes, etc. Slotted concave multi-wing coreless drill bit. Background technique [0002] Drill bits are widely used in geological exploration, mining and other fields. They are mainly used in the construction of underground gas drainage holes, water exploration holes, and grouting holes in coal mines. They are directly in contact with rocks or coal seams, and broken rocks or coal seams through rotary cutting and punching. Tool of. The drill bits widely used in modern coal engineering mainly include diamond drill bits, diamond compact (PDC) drill bits, cemented carbide drill bits, and anchor drill bits. Nowadays, diamond drill bits, diamond compact (PDC) drill bits and cemented carbide drill bits have developed to a very high level,...

AI Technical Summary

Problems solved by technology

One is the fear of complex geological structures, changes in the hardness of the rock formation will greatly reduce the drilling efficiency and hole formation rate of the drill bit

The second is to be afraid of scratching and reaming, which will cause great damage to the drill bit and affect the life of the drill bit

The third is that the material of the drill body is easy to wear during normal drilling, the hole diameter is insufficient, the intermediate drilling tool cannot drill in and out smoothly, the drilling hole is blocked, and the collapsed hole becomes a waste hole

The following disadvantages occur during use: (1) prone to tooth loss, chipping, burnout, excessive wear, failure to drive, and low efficiency

(2) The amount of powder discharged is large, and the pump volume is required to be sufficient. The difference between the diameter of the drill bit and the diameter of the drill pipe forms a ring gap when the drill is withdrawn. When the drill is withdrawn, the accumulation of drill cuttings is easy to lock the drill bit and is easy to lose.

Cannot drill into medium-hard rock formations, low rock-breaking efficiency, low center drilling capability, and drill cuttings are easy to enter the drill pipe, not suitable for wet drilling, with large wear and large hole diameter changes

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