In this video we have a 25t drilling rig in our garden drilling a 212m deep hole for a Geothermal Loop. The loop is connected to a Bosch Heat pump and will be our future heating system in the house.

The first 90m was mainly sand so two pipes was used. An outer casing and an inner drill pipe. When solid ground was found they continued with only the inner drill pipe.

The mud/chipped (lime) stone was removed using a high flow of water the was recirculated from a 20' container using a 7.5kW pump. After the drilling was finished most of the volume in the container was filled with sand and mud. We used ca 75m3 water for the project.

After inserting the loop they with some difficulty removed the casing and closed the void with bentonite.

Some 15years earlier we made new bathroom and pluming. I a bright moment I decided to put some empty pipes under the concrete floor and all the way into the lawn. They cam in handy now when we needed to connect the loop with the heat pump inside the house. So only a small part of the tile floor had to be removed to locate the opening.
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The system was filled with 25% IPA as brine.
The heat pump used is a 4-16kW Bosch 7800i
Data logger is husdata.se H66