Title:

Rate of Penetration of Geothermal Wells: a Key Challenge in Hard Rocks

Authors:

Clément BAUJARD, Régis HEHN, Albert GENTER, Dimitra TEZA, Jörg BAUMGARTNER, Frédéric GUINOT, Antony MARTIN, Sepp STEINLECHNER

Key Words:

Drilling data, Granite, Sandstone, ROP, Lithology, Thermodrill project

Conference:

Stanford Geothermal Workshop

Year:

2017

Session:

Enhanced Geothermal Systems

Language:

English

Paper Number:

Baujard

File Size:

2059 KB

View File:

Abstract:

A drilling data compilation of wells drilled in granite formations across Europe is presented. The review presented in this paper was performed in the Framework of the Thermodrill project that aims at developing a new drilling system suitable for drilling hard and abrasive rock types and able to withstand the extreme temperature and pressure conditions involved in geothermal drilling. The new system is based on high pressurized fluid-jetting. This paper summarizes the analysis performed while compiling relevant information, linking the Rate of Penetration (ROP) with drill site information, ROP being the key drilling parameter to be improved in the framework of the ThermoDrill project. The drilling data of the following wells have been analyzed: the Soultz-sous-Forêts (France) geothermal wells GPK2, GPK3 and GPK4, the Rittershoffen (France) geothermal wells GRT-1 and GRT-2, the Basel (Switzerland) geothermal well BASEL-1, the Insheim (Germany) geothermal wells GTI1, GTI1b and GTI2, and 4 Bohemian wells (Austria). For each site, a short overview of the geological context is proposed. For each well, the ROP is compared and analyzed thus leading to a proposed mean ROP value for drilling in granite. A normalized ROP is then proposed and discussed. Additionally, a correlation between ROP and lithology is proposed for wells where detailed lithological information is available. The Thermodrill project is a EU funded H2020 project (Grant agreement 641202). The work of Geo-Energie Suisse AG has been supported by the Swiss State Secretariat for Education, Research and Innovation (SERI) under contract number 15.0163.


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