Geothermal Drilling Best Practices

The main difference between conventional hydrocarbon and geothermal drilling is the characteristics of the source rock. The production zone of geothermal drilling is typically not a low-consolidated sedimentary rock as in conventional drilling for hydrocarbon reservoirs. Common rock types for hydro- and petrothermal reservoirs are hard volcanic and intrusive rocks or rigid sedimentary rocks, e.g. limestones or quartzitic sandstones. They are mostly good heat conductors and have high primary or enhanced permeabilities on fractured zones. The formation fluids often contain highly corrosive brines. Compared to relatively soft sedimentary rocks, geothermal formations are by definition hot, abrasive, highly fractured and have a comparable high compressive strength.

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Advanced Drilling Technologies

GZB – International Geothermal Centre

Bochum University of Applied Sciences

Lennershofstrasse 140
44801 Bochum
Germany

Dipl.-Ing. Volker Wittig

Leiter der Abteilung Advanced Drilling Technologies

Raum: G1 1-003
Tel.: +49 (0)234 32-10768

Volker Wittig

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