| Abstract |
The IDDP-2 project at Reykjanes, Iceland is a continuation of the ongoing Iceland Deep Drilling Project (IDDP). It was launched in the year 2000 and the IDDP-1 well was drilled during 2008-2009 in Krafla, North Iceland. A 5 km deep well, REYH-34, is proposed near the Reykjanes Power Plant in South-West Iceland. Expected enthalpy of superheated steam from the well is 2800 to 3100 kJ/kg, resulting in shut-off pressure of up to 250 bar and temperature of up to 480°C at the well head. The well head branch, mounted on the well head, consists of redundant valves, pipes and fittings designed to withstand these conditions with low risk of failure of critical components. The inside of these valves and fittings are coated with corrosion and erosion resistant stainless steel alloys. The branch is connected to two full flow lines and two test flow lines, the former being used for maximum well discharge, the latter for further studies of thermodynamics, fluid flow and chemistry of the well fluid. The full flow and test lines consist of a series of throttling orifices that reduce the high well pressure from over 200 bar down to atmospheric pressure. The steam, flowing at expected 10-35 kg/s is discharged through rock filled mufflers for silencing. Piping is designed to keep steam flow velocity within 50 m/s. The individual full flow and test lines are not designed as critical components and can be independently shut off from the redundant well head branch and repaired or replaced as needed. |