Dewatering drilling mud - France - Case Study
Reischtett geothermal drilling site - FRANCE (67)Issue / Need
FONROCHE Géothermie drills deep geothermal boreholes that produce a large volume of drilling mud (free from cuttings).
In order to improve its environmental footprint, Fonroche Géothermie decided to implement a solid waste disposal solution as opposed to the liquid mud currently produced by its drilling operations.
This drilling mud has complex physical properties: high density, high pH, high dry matter content and very low settleability.
TThe implemented solution involved:
- Breaking down the mixture by adding ferric chloride,
- Flocculating the contents before being transferred to the Geotube for dewatering.
Once the process was established, they decided to use the following equipment:
- A D3RE10 PVDF dosing pump with Kalrez seals, suitable for use in the extreme pH conditions associated with Ferric Chloride.
- A D25WL2IEPO dosing pump for the flocculating agent, with an in-line DYNAMIC MIXER (DMIX).
The entire unit was installed (in partnership with Fonroche Géothermie and Environium) in a 20-foot container, which includes an additive storage section, a dilution section, an injection section and a testing section.