Geothermal drilling is the process of creating a tubular void in the ground into which a geothermal probe is placed in order to extract low level energy. Complete thermal transfer along the length of the bore is important to its performance and this is where GeoDrill excels. Read on to find out how a geothermal system should be completed and why not all boreholes are equal
Drilling a borehole for a geothermal system involves creating a circular void in the ground for anything up to 200m deep per bore depending on the heating demand. This involves drilling through the overburden (unconsolidated ground consisting of clays/gravels/sands etc.) until solid rock is reached. In order to keep this ground open a casing (steel tube) must be applied alongside the drill string.
Grouting consists of pumping a thermally efficient bentonite clay and thermal sand mix under high pressure into the ground and filling from the bottom up. This eliminates any gaps or air pockets and ensures the probes have good thermal conductivity over the entire length of the bore.