Well completion in European geothermal applications best practice and project examples

Abstract

Well completions in challenging geothermal applications require reliable as well as durable equipment and an experienced service on-site. Based on best practices in numerous geothermal projects, the design, material and components of wellheads are modified to the special needs in differing conditions. The equipment should guarantee a maximum of operational availability, while running nearly maintenance-free for many years. All components have to be highly secure and meeting API 6A and permit authority requirements. Furthermore, professional advice and expert service during all project phases is an important success factor. For operators and permit authorities a comprehensive documentation is necessary, in order to assure the traceability of the certified materials used. In the Bavarian Molasse Basin in Germany, several geothermal projects are successfully realized these days. An interesting example is the deepest and most productive German well in Traunreut.
The paper will mention the general purpose of a wellhead as completion component, reflect on new requirements of recent times and describe the technical solutions based on selected examples for geothermal applications. Finally, the advantages in planning and benefits for wellsite operators as a result of these developments in engineering and design will be shown.