What is Core Drilling?
Core drilling is the process of removing a cylinder of material like borehole, and the leftover material inside the drill is called core. Annular cutters are known as the core drilling is made in metals. However the core drilling is made with concrete is basically known as diamond core drills, though for drilling masonry carbide core drilling is the technique used for this.
Firstly the core drilling is practised by ancient Egyptians, core drilling is generally used for many purposes when it needs to preserve core or when it needs to drill most swiftly subsequently the much lesser material necessitate to thrash other than standard. Therefore due to this major reason diamond core drill are often and best pick to use residential or commercial constructions. In these constructions, core drilling is used to make a hole for manholes, pipes, and many other highest diameter drilling in stone or concrete.
Mostly core drilling is used majorly in mine digging, in these mines, the coring can up to several thousand or several hundred feet deeper in length. The leftover core dust is recovered and use in researchers and study through geologists for stratigraphic points and considering mineral percentages in a leftover core.
In this way, the exploration organisations get enough knowledge and statistics which is ultimately essential to start mining process at the particular area. Core drilling has a wide range of techniques and methods with the highest power selections like hydraulic, pneumatic and electric; these all techniques need enough power sources.
There are different kinds of mechanism introduces for core drilling to make borehole on the ground. All these mechanisms have their certain depth limits with some disadvantages and advantages as well.
1. Auger drilling
In this technique, the helical screw is used that get into the ground with continues rotation. Auger drilling is best fit and appropriate to use in soft ground like swamps.
2. Air core drilling
This technique is used to drill solid tungsten and steel blades to make a hole at the unconsolidated ground. This drill has carried three blades attached all over the bit top, these blades are used to cut consolidated ground perfectly.
3. Cable tool drilling
It is the most traditional and ancient way to drill water wells, it is best to drill large diameter well with water and perfect to use in deeper water wells. This drilling method is still the best implementing drilling large diameter water wells.
4. Reverse circulation drilling
RC drilling is not wrong to say same like air core drilling, where drill cuttings get back to surface within rods. This drilling mechanism is more likely pneumatic countering piston stated as ‘Hammer’ and perfect to drill tungsten and steel bit. This RC mechanism used larger machinery and larger rigs and get into enough depth of 500 meters easily.