Sonic rig drilling is more of a rotary vibratory drill. It is a powerful drilling equipment highly reputed for its high drilling speeds and its various features and capabilities in completing tasks, which also includes continuous coring. This is one of the drilling tasks to which other equipment will be struggling with or will have much difficulty in dealing in handling, but not with sonic rig drilling.
What you will have initially is give you an impression of it resembling traditional air rotary drill rig. If there is anything distinct between the two of them, it is going to point you to the drill head. In terms of size, it is much bigger when put side by side with a standard rotary head. The head here is critical considering the fact that it is responsible for holding the mechanism required in facilitating rotary motion. The same can be used also in describing the oscillator, it takes on the responsibility of generating high frequency force.
Besides being pushed down and rotated, the drill bit will vibrate in an up and down fashion. These forces melding together makes it all possible to carry out a drilling process. This kind of drilling proper will proceed in the most seamless manner through many different kinds of geological formations even different types of rock.
The oscillator is one piece of hardware that will drive the hydraulic motor, utilizing as well its out of balance weights so as to come up with and generate sinusoidal forces. Eventually, of it will be relayed to the drill bit. The drill string, on the other hand, will contain all these alternating forces and can be made possible by incorporating air spring.
Varying frequencies will go so as to come up with conditions that are suitable for operation. Generally speaking, this come anywhere in the range of 50 to 160 hertz or cycles per second. For purposes of having a reference, in other countries the current household conditions would be alternating at 60 hertz.
This range of frequency is still within the vibration of sound, that level of sound frequency which the human ear can still perceive and hear. Hence, the coining of the term “sonic drill” for this particular kind of rotary-vibratory machine
The Advantages and Disadvantages of Sonic Rig Drilling
In sonic drilling, the advancement of the borehole is synonymous to rotary. It has never failed on giving good impressions that it will indeed work and will be even more effective under difficult drilling conditions such as gravel, boulder or landfill. It can also effectively handle softer formations including sandstone limestone or weathered basalt.
If you will compare sonic drilling to rotary method, you will come to realize that it will only produce about 10% less volume of drilling waste. Vibrations that are being produced by sonic drilling promotes the casing removal for grouting tasks. Air can be used in aid of alleviating borehole smearing for geotechnical and environmental downhole sampling and testing.
It is inevitable for drilling activities not to create vibratory motions and this can result in disruptions or disturbance to the rock formations surrounding it. There is also a good possibility that it would cause new fractures to appear on the hard and tough bedrock. When scenarios like this take place, it is likely going to harm the aquifer or the structural testing would be put to compromise.
But if your drilling project involves making shallow borings only, sonic rig drilling may not be the best drilling method you need to employ. The same thing can be applied when trying to drill through hard bedrock or into some other tough drilling conditions.
The drilling heat which the sonic rig drilling generates is capable of altering contaminant conditions, texture and may also have significant impact on moisture levels. However, it is comforting to know that this side effect can be alleviated with the help of drilling fluid.
You need to put on some protection on your sense of hearing the moment that generation of sonic vibrations commences. Failing to do so or by becoming oblivious of this run the risk of exposing your ears to damage.