Analyse of bedrock and developmet of charge and dis-charge strategies for fractured underground thermal storages

Purpose and goal: ** Denna text är maskinöversatt **

Objective was initially to develop tools and methods for flow property analysis of fractured underground storage systems. When testing the developed method, it was found to work, but the results showed that the flow in the system was too low. The new objective became to develop tools and methods to create more fracture systems.

The new goal was to create a new complete system with high flows. Goal fulfillment was partial. We got tools and were able to make cracks but did not get sufficient flows due to too weak pumps. Expected results and effects: ** Denna text är maskinöversatt **

The results were that the method for measuring the crack system proved to work. However, there is potential for improvement. The method will be used in future project.

The results from the crack creation were also very good. Hydroc has built up a lot of knowledge about fracturing that will be used in the future. Approach and implementation:

The first tests were carried out in Hydroc´s pilot installation in Linköping. The consulting firm Bengt Dahlgren participated there with equipment.

The development and testing of new methods for creating fracture systems was carried out in Sävsjö, Småland. The drilling was carried out by Geogruppen. New equipment was purchased to create the crack systems. Together with the company Fracsinus, methods were developed and tested to create the cracks. All moments were measured and logged in a computer. The results were measured using traditional water loss measurement.