We have several drilling techniques that can be taken advantage of if you need to sink your borehole down and into the ground.
Every single one of them comes with their own set of pros and cons, with respect to the depth which it will drill through, the ground specimen that is returned, the achieved rates of penetration, and the involved costs of the operation.
Drill techniques come in 2 basic forms: drills that produce chips of rock. And then there are drills that produce samples of the core. Below are some of the most commonly used methods of drilling.
Auger drilling is a type of drilling techniques that makes use of a helical screw. As it rotates, it can be driven right into the earth. The drilled ground from the earth is taken up to the level of the borehole with the help of the screw blade.
When working on softer ground types like swamp, the hole itself may not remain open on itself for soil engineering, geotechnical drilling, geochemistry reconnaissance work, and environmental drilling to explore possible mineral deposits.
For harder ground construction drilling, project heads can make use of buckets or flight augers. There are instances also that mine shafts will be dug using auger drills. A small type of auger can be set up at the back of a standard utility truck, where extra-large augers are intended for use in bridge foundation sinking piles.
Air Core Drilling
In order for air core drilling and other related drill techniques to bore a hole into a qualified unconsolidated ground, the use of tungsten and hardened steel can be employed. Normally, the drill bit is equipped with 3 blades first and fixed the same to surround the bit head, allowing for the cutting through of the unconsolidated ground.
The rods used in this system of drilling are hollow. They also contain an inner tube that sits inside the hollow outer rod barrel. By injecting compressed air into the hole, the drill cuttings can be removed through the annular area. This can be found between the drill rod and the innertube.
The drill cuttings will be blown back to force the inner tube up. From here they can get past the sample separating system and will be collected as necessary. Drilling procedure will go on with the inclusion of rods to the drill string top.
Cable Tool Drilling
When it comes to drilling for new water well systems, cable tool rigs are traditionally used for this purpose. A good number of large diameter water supply wells, particularly those that are accomplished via bedrock aquifers, were completed because they made use of this drilling method.
Even though this type of drilling system has been largely supplanted in the past years by an awful lot of other faster drilling techniques, it still remains as among the most practical drilling methods to use especially when dealing with deep, large diameter bedrock wells. It is also ideal for use in drilling wells intended for rural water supply wells.