After all the years I have attended NGWA, I found myself in an uncharted drilling community of drillers from all around the world. I had to seek out the team that brought drillers together from multiple continents.
If you have perforated casing and the formation no longer produces enough, you must seal the open perforation with cement before you drill down to the next aquifer.
The grout serves as an integral part of a properly functioning heat loop system, and also creates a low-permeable seal through the length of the borehole. Follow these steps to ensure a good sample of grout for thermal conductivity testing.