| Title | Modular Solutions for Turn Key Geothermal Projects – Case Study Well Doublet Lansingerland, NL |
|---|---|
| Authors | Sebastian HOMUTH, Randy LOOS |
| Year | 2020 |
| Conference | World Geothermal Congress |
| Keywords | project management, risk assessment, value engineering, turn key solution, case study, district heating |
| Abstract | Despite favourable political and geological conditions geothermal projects for heat and/or electricity production face significant challenges in regards of structured project financing and execution. An experienced general contractor with the ability to provide project specific construction guarantees and a risk sharing approach can be the key element for the successful execution of geothermal projects. In order to provide turn key solutions a detailed technical and associated risk assessment needs to be performed. A long the way process optimisation and technical updates can be implemented which will lead to faster project realisation. This approach can be applied to the whole value chain of geothermal projects containing on a modular basis the project development and management, road, infrastructure and drilling location construction, conductor installation, well drilling including completion, heat and/or power plant construction as well as district heating network installation. The first successful implementation of this approach was done for the subsurface part of the geothermal doublet Lansingerland, NL. The production well was designed as an exploration well to encounter all three potential reservoirs (Berkel, Delft and Alblasserdam) and was drilled with a maximum inclination of 54° to a final depth of 2709 m (2114 m TVD). The injection well was drilled with a maximum inclination of 61° to a depth of 2860 m (1859 m TVD). Both wells were successfully drilled with positive displacement mud motors instead of using cost intensive rotable steering systems despite the high inclination of the wells. The well test showed flow rates of up to 400 m³/h, associated temperatures of 60°C and a water/gas –ratio of approximately 1:1. Technical optimisation of operational procedures and specific drilling services as well as project insurance solutions have been accomplished and will be discussed in this paper. |