Considered by industry experts as an advanced form of drilling, the technique involved in sonic drill employs the application of resonant, high frequency energy produced by the Sonic head. By this measure, the core barrel will advance to the subsurface formations. In the course of the drill process, this resonant energy is conveyed to the drill string and after which it is down to the bit face in different sonic frequencies. By rotating the drill string simultaneously, the energy is evenly distributed, impacting the bit face.
Right inside the sonic head, the resonant energy can be generated by its two weights that are counter-rotating. What keeps the resonant energy from being transmitted to the drill rig is the pneumatic isolation system that is happening right inside the sonic head. This will help course the energy to the drill string.
The control over this resonant energy which is produced by the oscillator of the sonic head will match the formation encountered, which in the process is helpful in achieving maximum productivity in drilling. Resonance is likely to happen when the resonant energy meets to a certain point the drill string’s natural frequency. This will pave the way for the maximum amount of power being brought to the face. At the same time also, the soil friction is substantially minimized rendering the penetration rates much faster.
Procedure for Sonic Drill
There are various ways to drill with using sonic (this may have to depend upon project objectives or site specific conditions), the most taken advantage of is advancing a core barrel. A larger diameter drill can override this by virtue of a larger diameter drill which is encasing the open bore hole. It is also helpful in preventing the structure to collapse.
Step 1 Advancing the core barrel
Core barrel can be advanced by virtue of sonic frequencies. Under specific conditions, you can carry out this step even in the absence of air, fluids, or mud.
Step 2 Casing Override
The moment that the core barrel is put in place, the casing can be sonically advanced on the core barrel. By this measure, the integrity of the bore hole can be protected in loose ground.
Step 3 Core Retrieval
You retrieve the core barrel. This process is likely to produce an undisturbed sample. There is a high probability that you can have a 100% core recovery here.
Step 4 Repeat Core Advancement
From step 1 down to step 3, you repeat them to depth. This measure will produce you a continuous core sample via unconsolidated formations. The percentage of deviation here is less than 1%.
Sonic Drilling is A Cleaner Way to Drill
There are instances that you would want to veer away from the use of mud, water, or even air while drilling. In sonic drilling, the use of mud or air while drilling is not considered a requirement. This is the reason why sonic drilling is the method of choice for geo-construction, geotechnical and environmental applications.
Environmental projects can take the significant cost savings to their advantage just by utilizing this drilling method. Normally, with these kinds of projects, they usually necessitate you to have a substantial amount of funding for them and time, so you can properly discard whatever investigation derived waste it will produce.
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