Near field review for the Speyer Geothermal Project

The use of risk insurance instruments from various institutions provides security for a geothermal project. These instruments help to mitigate the financial risks associated with drilling and production and ensure that the project remains viable even in the face of uncertainties. Compared to similar projects in Germany, the upcoming geothermal wells in Speyer have a unique advantage. Over the last decades, a lot of deep wells have been successfully drilled into the same target formation in the immediate vicinity. This pool of experience makes it possible to carry out an accurate risk and experience analysis, which can be used to ensure that the project is designed, planned and operated in a sustainable manner and with a clear risk picture.  

The review considers the existing wells drilled in and around Speyer. The subsurface and associated problem areas, as outlined in the "Well Design Strategy - Casing Scheme," detail the casing schemes that have been employed to date and the lessons learned from open hole problems. It is important to note that a potential fundamental well integrity issue is the safe installation of casing. Another topic that may be of interest is the directional drilling strategy, which includes the well trajectory, lessons learned, and successful mitigations. An optimised drilling fluid is essential for successful drilling. The mud experience in the different sections and successful adjustments, the cementation experience and its optimisation, data acquisition experience in the adjacent wells and investigations carried out to mitigate various problems were also discussed.

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