The Iceland Deep Drilling .Paper Number The Iceland Deep Drilling Project ... cussed the science

The Iceland Deep Drilling .Paper Number The Iceland Deep Drilling Project ... cussed the science

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  • Economic Goals of IDDP

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    Paper Number The Iceland Deep Drilling Project10 Years Later - Still an Opportunity for International Collaboration3901

    www.icdp-online.org/sites/

    iceland/news/

    www.iddp.is

    1,2HS Orka hf, Reykjanesbr, IS 260, Iceland, 3University of California, Riverside, Dept. of Earth Sciences, Riverside, CA 92521, USA.

    G. O. Fridleifsson1 (gof@hs.is), A. Albertsson2 & W. A. Elders3

    The major energy companies of Iceland formed a consor-tium to improve the economics and availability of geother-mal resources by investigating the deeper levels of hydro-thermal systems. Drilling the necessary deep wellspresents both technical challenges and opportunities forimportant scientific studies. The IDDP therefore welcomedparticipation by the international scientific community.

    Participants from 12 different countries attended two IDDPworkshops funded by the International Continental Scientif-ic Drilling Program (ICDP); the first of these discussed theoptimal scientific drilling strategy, and the second dis-cussed the science program based on more than 50 scien-tific proposals from different investigators.

    As a first step towards achieving its goals, rather than drilling a new wide-diameter well from the surface to the total depth, the IDDP Workshop 3proposed to deepen an industry geothermal well being drilled by HitaveitaSudurnesja, situated in a geothermal field on the Reykjanes Peninsula. This wellwould be ideally situated for scientific studies as the Mid-Atlantic Ridgeemerges from the ocean at the southwest tip of Iceland (Figure 1). Thus theReykjanes well would permit scientific investigations both of potentiallyeconomic high-temperature hydrothermal phenomena and of mid-ocean ridgeprocesses similar to those that feed black smokers.

    The well was drilled to a depth of 3.1 km. The rockspenetrated consisted of Holocene tholeiites, hyalo-clastites, marine sediments, pillow basalts, and rel-atively coarse-grained diabase dikes. At that time itwas planned that the IDDP would rotary drill andspot core this well to 4.0 km depth in 2006, andthen, in 2007, to deepen the borehole from 4.0 kmto 5.0 km, using continuous wireline coring.

    The 3.1 km deepwell becameblocked during aflow test.

    Subsequentattempts torecondition thewell failed, and thewell had to beabandoned.

    At IDDP- Workshop 4 it was decided that opera-tions would move to Krafla in NE Iceland, one ofthe central volcanoes shown in Figure 1. Lands-virkjun, the operator of the Krafla geothermal field,agreed to drill a 3.5 km deep well and make it avail-able to the IDDP for deepening into the supercriti-cal zone. The hydrothermal system of Krafla is in avolcanic caldera with higher temperature gradientsand more recent volcanic activity than at Reykjanes.

    Increased interest in the IDDP on the part ofindustry. Alcoa, Inc., an international aluminumcompany, joined the consortium as financialpartner. Orkuveita Reykjavikur and HitaveitaSudurnesja each made a commitment to drill a3.5 km deep well in their geothermal fields atHengill and Reykjanes, respectively, and makethem available for deepening, as contributionsto the IDDP.

    IDDP-workshop 5 reviewed thesituation and reconsidered theplans in view of new circum-stances. However becausedeep drilling plans are furthestalong at Krafla, it was decidedto focus on that field first.

    The partners in the IDDPconsortium signed a newcontract to collaborate indeep drilling in Iceland.

    Feasibility Report published.

    IDDP/ICDP SAGA/PIInternational start-upmeeting.

    StatoilHydro becamepartner in the IDDP. Con-tact for drilling at Kraflasigned with the IcelandDrilling Co. Ltd.

    The IDDP-01 well wasdrilled and casedto 800 m depth.

    2009

    Drilled to 2100 m withnumerous problems, sosidetracking was neces-sary. Set Anchor casing to1949 m instead of 2400 m.

    Rhyolite magma flowedinto well at 2096 m depth.

    We thank the companies and organizations behind the IDDP consortium for the opportunity to

    implement the Iceland Deep Drilling Project. We also thank DeepVison, SAGA, GS-, DT-, FHE-

    technical groups, as well as all other domestic and international collaborators for the collabora-

    tion so far.

    We are also grateful for the financial support from the ICDP and the US NSF (award number

    EAR-0507625 to Elders).

    Acknowledgements

    Icel

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    GeoS

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    y-20

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    The initial plans of the Iceland Deep DrillingProject (IDDP) were announced and present-ed as an opportunity for international collabo-ration at WGC-2000 in Japan (Frileifssonand Albertsson, 2000). Now 10 years laterwe review the accomplishment andannounce near future drilling and researchplans of the IDDP.

    The IDDP logo shows the essential parame-ters behind the concept of thermal mining.The basic idea by the IDDP is to drill deepenough into the roots of conventional hightemperature hydrothermal systems to pro-duce water at natural supercritical conditionsand bring it to the surface as 400-600Csuperheated steam, at subcritical pressures(