BoreHole Drilling Knowledge

In order to share our drilling knowledge to people who are interested in borehole dirlling. Here are introduction and application cases regarding water well drilling, geotechnical drilling, foundation drilling and minning exploration drilling. It also introduces the drilling method of rotary drilling, DTH(Down The Hole) Drilling and Top Hammer Drilling. The basic knowledge of drilling tools and rock are demonstrated as well.

We hope this kind of drilling knowledge could be helpful for our customers, friends and peers working in borehole drilling area.

Here we will give the high level introduction on how to select the DTH drilling tools, due to they are the key components for borehole drilling. Hammers and bits Generally the hammer should be selected to match the maximum operating conditions for the compressor The recommendation is that the hammer shall use about 85% of the compressor air delivery capacity The bit should be selected to give best possible drilling rate and service life in present rock conditions Bit face and head design Flushing holes […]

What is Cemented Carbide? A powder metallurgical material A composite material comprising hard particles embedded in a binder phase. The hard particles are Carbides like WC, TiC,TiN The binder phase is Cobalt, Nickel or an alloy For Rock Tools grades WC – Co is used. Cemented Carbide inserts         Applications Top Hammer […]

How to Repair Drill Bit

February 11, 2018

General In article DTH Drilling Care & Maintenance – Part One and DTH Drilling Care & Maintenance – Part Two , we introduced how to correct balanced system, causes of product failures and the importance of lubrication. Here we will explain the importance of regular repair bit and how to do it Service life for rock drilling tools is […]

Drilling Methods There are four different drilling methods to select from: − Rotary wearing − Rotary cutting − Rotary crushing − Top hammer percussive − Down the hole percussive Rotary wearing − Rotary wearing method’s application is normally for sampling for geotechnical exploration. −  Drill bit is made of a couple of 3-edges, 3-edges consist outer edge, middle edge and internal edge. Every edge only take one […]

General In chapter DTH Drilling Care & Maintenance – Part One, we introduced following topics: A balanced system Correct drilling parameters Most common causes of product failures Corrosion Fatigue Galling In this chapter, the discussion will be continued and following items will be explained: Lubrication Hammer disassembly Drill pipes Lubrication Correct lubrication during DTH drilling is extremely important Inadequate lubrication is a major cause of hammer wear and failure Excessive lubrication slows down the […]

General Due to there are a lot of knowledge on care & maintenance, the whole content is divided into two parts- DTH Drilling Care & Maintenance – Part One and DTH Drilling Care & Maintenance – Part Two Content A balanced system, please read basic DTH and Top Hammer drilling knowledge Correct drilling parameters Most common causes of product failures Corrosion […]

Rock Drillability

January 15, 2018

In last article, the rock property was introduced, here we will give the introduction of rock drillability. Rock Mechanical Classification Rock Properties that have an overall effect on the drillability are as following: Hardness Abrasiveness Texture Structure Breaking characteristics Harness Mohs’ scale and VHN comparison Uniaxial Compressive Strength(UCS) Specimen inserted in the testing machine between […]

Rock Properties

January 8, 2018

General In order to know the variable rock drillability and select the most suitable drilling rig to get the best drilling efficiency. Firstly, we have to be friend with rock that KNOW THEM. This course will introduce the basic knowledge of rock classification based on origin, the difference of rock properties and their effects on drilling. The methods of testing […]

Well Drilling Method

December 29, 2017

Well Drilling including geothermal and water is often the least understood. This article provides the basics of equipment and methods used for drilling and completion of geothermal and water wells. Due to cable tool is very old and less efficient way of drilling, it would be talked about here. Rotary and DTH drilling will be focused. […]

Among all the drilling method, Down The Hole(DTH) drilling is being used more and more widely and has very high efficiency for some cases. Here, we will introduce the specific application for DTH drilling as most import part of whole basic drilling knowledge. Mining                       […]