Planning/Preparation of a deep drilling

GRD drilling method - this term has not yet been used in searches here in the forum.

It is still common practice to access geothermal energy through vertical drilling. The drilling technology required for this is complex, expensive and often causes surface damage.

It is not uncommon for a significant portion of the investment costs to be spent solely on drilling. This hinders the willingness to invest of many homeowners.

With the new GRD method (GRD = Geothermal Radial Drilling), the costs can be significantly reduced.

Just as a tree sends its roots into the ground, the GRD method makes it possible for geothermal probes to be introduced from a small shaft radially in all directions and inclinations, even beneath buildings.

In Northern German row houses in Westphalia, the system was awarded an innovation prize.

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With the new GRD method, geothermal probes can be installed quickly and cost-effectively with a small drilling rig adapted to the task. Unlike conventional installation techniques, in this method geothermal probes are installed at an inclination angle of 25 to 65° in all directions from a central shaft into the underground.

For those interested, google...

Best regards Ecart

Lower Saxony has a website where all drillings are listed. Maybe there is something like that for you as well.

I just asked Aunt Google, but I haven't found a list yet

can you please tell me where I have to look?
State of Lower Saxony?

Good morning,

With the new GRD method, geothermal probes can be implemented quickly and cost-effectively with a small drilling rig adapted to the task.

To my knowledge, the costs for this drilling method are just as high/low as for conventional drilling, depending on soil conditions. This is, in my opinion, because several smaller drillings have to be performed; and this drilling method is not that new either. There must therefore be a reason why it could not establish itself at the top of the common methods; innovation awards are not the only decisive factor.

Rhenish regards

I don't find the price too expensive now, but I paid significantly less for 10 meters less (and by that I mean a good 2000 euros less, NRW Rheinland).

How many meters have you drilled? The LBeg recommends 70 to 90 meters double U-probe. The drilling contractor said 100 m and assumes a withdrawal capacity of 50 W/m (which we don't even have yet). That confuses me a bit.

If you google "effiziente Wärmepumpe Dimensionierung Erdwärmesonden" and click on the first non-ad page, you will find very good information on the design of the borehole that will hopefully help you. You are not allowed to share links though :-(.

Otherwise, I would rather take a few meters more than less, as this definitely increases efficiency (even if only slightly), but you are on the safe side, especially if a long and cold winter comes.