WarmteStad is developing a district heating scheme within the city limits of Groningen that planned capable of providing 10.600 housing equivalents (WE) of heat within 7 years. This is the equivalent of 8 000 000 m3 of gas per year. The heat will be produced from a geothermal doublet in the Slochteren formation at a True Vertical depth of between 3.200 and 3.600 meters. Both producer and injector well will be drilled deviated, ending at a separation of about 1 300 meters at reservoir depth. Based on reservoir parameters a P50 production of 232 m3/hr can be expected. For the design of surface facilities and the business case a maximum production has been set at 200 m3/hr. The minimum expected production (P90) of the reservoir was estimated at 160 m3/hr It is therefore the aim of the project to obtain a production 200 m3/hr.