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Hard rock core drill bit

A technology for core drilling and hard rock, which is applied to drill bits, earthwork drilling, drilling equipment, etc. It can solve the problems of slow blade cooling speed, short blade service life, and fast tool wear, so as to speed up cooling speed, prolong life, The effect of reducing wear

Pending Publication Date: 2018-12-04
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The drilling tool is an indispensable tool for getting rock cores. The existing coring bits have a slow drilling speed and low coring efficiency; short life

Method used

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 , 2 , 3, the hard rock core drilling tool disclosed by the present invention includes a hollow drill bit 1, and the drill bit 1 is a PCD cutter. The drill bit 1 comprises a primary blade 2 for drilling and a secondary blade 3 for reaming.

[0030] The drill 1 includes an inner drill 11 and an outer drill 12 , the inner drill 11 includes a first-stage insert 2 and a hollow inner drill body 111 . Such as image 3 As shown, the lower end of the inner drill body 111 has a first-level blade installation groove 112 for installing the first-level blade 2, and the first-level blade installation groove 112 is opened on the lower end surface of the inner drill body 111. There is a coolant circuit hole 6 at the first-stage blade mounting groove 11...

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Abstract

The invention relates to a hard rock core drill bit. The hard rock core drill bit comprises an outer core tube and a hollow boring bit. The boring bit is installed at the lower end of the outer core tube, and spiral grooves are separately formed in the outer walls of the outer core tube and the boring bit. The spiral grooves on the boring bit are continuous with the spiral grooves on the outer core tube. The boring bit includes an inner boring bit and an outer boring bit, and the inner boring bit is installed in the outer boring bit. A first stage blade is arranged at the lower end of the inner boring bit, and a second stage blade is arranged on the outer wall of the outer boring bit. The first stage blade and the second stage blade are separately provided with coolant loop holes. In the hard rock core drill bit, the boring bit is divided into two-stage blades, the blade at the lowermost end is used for drilling a small hole first, and then the upper blade is used for broaching, so that the drilling rate can be improved, and the core-taking efficiency is improved. The coolant loop holes are separately formed in the blade portions to spray a coolant out through the through holes tocool the blades, the cooling rate of the blades is accelerated, the abrasion of a tool is reduced, and the life of the blades is prolonged. The outer core tube is provided with the spiral grooves continuous with the boring bit, and with the outer core tube being screwed into a rock stratum, the outer core tube creates a confined space for the coring tool to prevent contamination of a fidelity cabin.

Description

technical field [0001] The invention relates to the technical field of core drilling equipment, in particular to a hard rock core drilling tool. Background technique [0002] In the process of oilfield exploration, cores are important data for discovering oil and gas layers and studying formations, oil source layers, oil reservoirs, cap rocks, structures, etc. Through observation and research on cores, we can directly understand the lithology and physical properties of underground rock formations And oil, gas, water features. After the oilfield is put into development, it is necessary to further study and understand the sedimentary characteristics of the oil layer, the physical properties, pore structure, wettability, relative permeability, lithofacies characteristics of the reservoir, the physical simulation of the oil layer and the water flooding law of the oil layer through the core; In the development stage and the water flooding characteristics of oil layers in differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/02E21B10/42E21B10/60E21B25/00
CPCE21B10/02E21B10/42E21B10/60E21B25/00
Inventor 谢和平张茹张志龙陈领高明忠鲁义强何志强李聪华夏明传剑陆彤彭高友
Owner SICHUAN UNIV
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