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1000 Titel
  • Monitoring cold water injections for reservoir characterization using a permanent fiber optic installation in a geothermal production well in the Southern German Molasse Basin
1000 Autor/in
  1. Schölderle, Felix |
  2. Lipus, Martin |
  3. Pfrang, Daniela |
  4. Reinsch, Thomas |
  5. Haberer, Sven |
  6. Einsiedl, Florian |
  7. Zosseder, Kai |
1000 Erscheinungsjahr 2021
1000 Publikationstyp
  1. Artikel |
1000 Online veröffentlicht
  • 2021-09-03
1000 Erschienen in
1000 Quellenangabe
  • 9(1):21
1000 Copyrightjahr
  • 2021
1000 Lizenz
1000 Verlagsversion
  • https://doi.org/10.1186/s40517-021-00204-0 |
1000 Publikationsstatus
1000 Sprache der Publikation
1000 Abstract/Summary
  • <jats:title>Abstract</jats:title><jats:p>Fiber optic sensing has gained importance for wellbore monitoring and reservoir characterization in geothermal fields as it allows continuous, spatially highly resolved measurements. Distributed acoustic sensing (DAS) and distributed temperature sensing (DTS) technologies, among others, enable monitoring of flow regimes and heat transport inside the wellbore to describe the dynamical behavior of the reservoir. The technically challenging installation of a permanent fiber optic monitoring system in a geothermal production well over the entire wellbore length was conducted for the first time at the geothermal site Schäftlarnstraße in Munich, Germany. One cable with two DAS fibers, two DTS fibers, and one fiber for a downhole fiber optic pressure/temperature gauge were clamped to ¾-in. sucker rods and installed to 3.7 km measured depth to collect data from the wellbore after drilling, during testing, and during operations. We present DTS profiles during 3 months of well shut-in and show the results of two cold water injection tests conducted to localize inflow zones in the reservoir and to test the performance of the fiber optic setup. A vertical displacement in temperature peaks of approximately 1.5 m was observed during the injection tests, presumably resulting from thermal contraction of the sucker rod–cable setup. This was verified by analyzing the strain information from the DAS records over 1 h of warm-back after cold water injection with the calculated theoretical thermal contraction of DTS of the same period. We further verified the flowmeter measurements with a gradient velocity analysis of DTS profiles during injection. Intake to the major inflow zone was estimated to 93.5% for the first injection test, respective 94.0% for the second, intake of flowmeter was calculated to 92.0% for the same zone. Those values are confirmed by analyzing DTS profiles during the warm-back period after the well was shut.</jats:p>
1000 Sacherschließung
lokal Geothermal
lokal DAS
lokal DTS
lokal Fiber optic monitoring
lokal Research
lokal Flow zone
lokal Reservoir characterization
lokal Bavarian Molasse Basin
1000 Liste der Beteiligten
  1. https://frl.publisso.de/adhoc/uri/U2Now7ZsZGVybGUsIEZlbGl4|https://frl.publisso.de/adhoc/uri/TGlwdXMsIE1hcnRpbg==|https://frl.publisso.de/adhoc/uri/UGZyYW5nLCBEYW5pZWxh|https://frl.publisso.de/adhoc/uri/UmVpbnNjaCwgVGhvbWFz|https://frl.publisso.de/adhoc/uri/SGFiZXJlciwgU3Zlbg==|https://frl.publisso.de/adhoc/uri/RWluc2llZGwsIEZsb3JpYW4=|https://orcid.org/0000-0001-5317-3368
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1000 Erstellt am 2023-04-26T13:16:21.707+0200
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1000 Zuletzt bearbeitet Thu Oct 19 11:54:17 CEST 2023
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