We all have heard about drilling but not every one of us clearly understands what is it all about. What is more interesting is the fact that there are different kinds of drilling techniques. The technique that will be used greatly depends on the purpose of the project, as well as the location of the job site.
One of the most popular drilling techniques used today is sonic drilling. It is a clean, safe, and low impact technique. In this type, boreholes are being drilled, cored, and then cased by means of rotation and vibration to the rod, core barrel, and casing at sonic frequencies.
For this one, high airflow is being injected through a drill string. This will be followed by the evacuation of the rock cuttings coming from a borehole and then stabilizing this borehole in time of drilling. Compared to other techniques, this is considered to be more effective because the high flow of the air consistently cleanses the bottom part of the borehole. This allows steady contact between the intact bedrock and drill bit.
In this technique, drilling mud will be directly injected in the drill string, cooling, and lubricating the bit, then carry the cuttings that are supposed to be placed in the pit or mud tub. This allows the elimination of cuttings right from the mud.
The drilling mud cleanses the bottom part of the borehole, depositing a resistant wall cake, thus overcoming the formation of fluid pressures and preventing the caving of the walls. Moreover, the drilling mud prevents damage to the water zones so that interpretable electric well-logs will be acquired so the drill pipe is protected against corrosion.
This includes some kinds of drilling equipment and drilling rigs. This technique advances the drill string by hammering or pushing without having to rotate the string. A direct push rig includes a sampling rig like a Geoprobe and cone penetration test. In addition, they are only restricted to drilling in very soft rocks, as well as unconsolidated soil material.
This type of drilling makes use of a hydraulic hammer and hydraulic cylinders in order to move a core sample that is hollow to gather groundwater and soil samples. The depth and speed of the penetration are highly reliant on the type of soil, sampler size, and the power and weight of the rig.
Moreover, it is important to note that a direct push technique is limited only to a low soil sample in unconsolidated material. One best advantage for this type of technology is the fact that it is capable of producing a lot of high-quality samples cheaply and quickly. Instead of hammering, this technique could be joint with the sonic method for better drill efficiency.