Benefits of Dual Rotary Reverse Circulation Drilling
Roberts Irrigation is re-tooling its new Foremost Dual Rotary Drilling Rig & Support Trucks this year to maximize the amount of water available from each and every well that we drill. Most wells are drilled with conventional direct rotary drilling where drilling clays or muds are added to the drill hole to hold the hole open. This drilling mud tends to plug up the formation (that’s its job) and the result is a finished well with low production.
With Dual Rotary like the above drill rig we have two rotational devices. The drill rod is turning a drill bit and a very heavy duty turntable is turning the large well casing at the same time. What the re-tooling brings is that instead of the drill cuttings being forced up the hole between the drilling rod and casing with air they are now going to be brought up with reverse circulation; they will be vacuumed up the inside of the large 7″ hollow reverse circulation drill rod. Along with the change to reverse circulation method we have acquired a special reverse circulation Hammer System. The hammer system along with the Dual Rotary and reverse circulation system will allow us to drill through sand, gravel, boulders, and rock formation like sandstone with ease.
Well drilling methods vary widely. Roberts Irrigation employs the reverse rotary method of drilling which has been shown to yield the highest possible quantity of water out of any given aquifer formation.
Before you apply water to your fields, you need to find it and then move it through your irrigation system. Roberts Irrigation offers unmatched expertise in well drilling as well as designing a pumping system matched precisely to both your well capacity and your irrigation requirements.
Specialists in high-capacity wells While any well that produces over 70 gallons per minute is by common definition a high-capacity well, Roberts wells typically pump over 1,000 gallons per minute. The reason for that difference is because Roberts drills wells differently. We use the reverse rotary method of drilling exclusively. While it requires more equipment and manpower on our part, it’s proven to yield a much higher amount of water from unconsolidated aquifers.
We do not use drilling muds typically used by other companies to plug the formation during drilling that can later act as a barrier to water pumping. We drill larger wells, usually 30 inches in diameter with 16-inch steel casings and continuous-welded v-wire screen. We use only the finest well filter pack materials beyond the screen – providing the best water possible while maintaining a sand-free well.