eprintid: 1848 rev_number: 10 eprint_status: archive userid: 6 dir: disk0/00/00/18/48 datestamp: 2017-03-02 11:13:10 lastmod: 2017-03-02 11:13:10 status_changed: 2017-03-02 11:13:10 type: article metadata_visibility: show creators_name: Jung, Reinhard creators_name: Schindler, Marion creators_name: Nami, Patrick creators_name: Tischner, Torsten corp_creators: Jung-Geotherm, Germany corp_creators: BESTEC GmbH, Germany corp_creators: Wintershall Holding AG, Germany corp_creators: Federal Institute for Geosciences and Natural Resources (BGR), Germany title: Determination of flow exits in the Soultz borehole GPK2 by using the brine displacement method subjects: O subjects: RF1 subjects: SG divisions: IP4 full_text_status: none abstract: The article presents a method to derive synthetic flow logs from low rate injection tests in wells, which are otherwise not accessible for logging. The tests were carried out in the 5 km deep geothermal well GPK2 in the Enhanced Geothermal System (EGS) project of Soultz-sous-Forêts (France) and were aimed at characterizing the status of the well before chemical treatments. The method consists of injecting water at constant flow rates into the well initially filled with brine. The wellhead pressure record of this test is transformed into log of the flow velocity versus depth by a technique described in the paper. Applying this method to borehole GPK2, three outlets could be detected and quantified within the cased and uncased section of this borehole. The outlet in the cased section at 3860 m absorbed 15% of the total flow. This depth corresponds to a known casing restriction, which makes the borehole inaccessible for logging operations. The two other outlets are at the casing shoe at 4420 m (15%) and at 4670 m (70%). date: 2010 date_type: published publication: Comptes Rendus Geoscience volume: 342 number: 7-8 publisher: Elsevier pagerange: 636-643 id_number: doi:10.1016/j.crte.2009.06.002 issn: 1631-0713 official_url: http://doi.org/10.1016/j.crte.2009.06.002 access_IS-EPOS: limited owner: Publisher citation: Jung, Reinhard and Schindler, Marion and Nami, Patrick and Tischner, Torsten (2010) Determination of flow exits in the Soultz borehole GPK2 by using the brine displacement method. Comptes Rendus Geoscience, 342 (7-8). pp. 636-643. DOI: https://doi.org/10.1016/j.crte.2009.06.002