IDDP-2 Well Head and Flow-line Design for IDDP-2

Abstract

The IDDP-2 drilling project at Reykjanes, Iceland, is the 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. An already existing well at the Reykjanes Power Plant was deepened to 4,5 km and is now called the IDDP-2 well. Super critical fluid has been observed at the bottom of the well. Enthalpy and chemistry of the expected fluid is not known due to mixture with two phase inflows at shallower depth. Taking into account this uncertainty, the well head itself was designed assuming the worst-case scenario, i.e. 450°C and 300 bars. The valves and fittings are with corrosion resistant cladding and selected in Class 2.500. A modulating orifice control valve, used in HS-orka installations at Reykjanes has been developed to withstand the severe corrosion and erosion environment. The main and the secondary back-up test flow-lines consist of fixed and variable orifices, flow measuring orifices, test tapings and RJ-nozzle, reducing the high well pressure to atmospheric flash separator.