IDDP-2, Well Design

Abstract

The drilling of IDDP-2, well two in the Icelandic Deep Drilling Project, is being prepared in Reykjanes, Iceland. The planned depth of the well is 5000 m with a casing running down to 3000 m and an ø8 ½" production section down to 5000 m. As the location of the well is planned in the vicinity of wells already drilled in Reykjanes, the formation conditions are relatively well known down to 2700 m. Formation conditions beneath 2700 m are not known but the aim is to find superheated fluid. Experience gained from drilling and operating IDDP-1 is most important when preparing for drilling IDDP-2. The design conditions are somewhat different, however, mostly due to the high salinity of the fluid in Reykjanes. The design conditions for IDDP-2 are outlined and different scenarios for pressure and temperature downhole explored. The well design is aimed at addressing the challenges caused by the high pressure and temperature expected down hole and during discharging and also high leakages expected in the conventional production zone above 2700 m. With this in mind various casing programs and types are discussed and studied as well as different cementing methods. Based on the result of the studies a proposed well design is presented.