Monitoring cold water injections for reservoir characterization using a permanent fiber optic installation in a geothermal production well in the Southern German Molasse Basin
نویسندگان
چکیده
Abstract 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 (DAS) distributed temperature (DTS) technologies, among others, enable of flow regimes heat transport inside the to describe dynamical behavior reservoir. The technically challenging installation a permanent fiber system production well over entire length was conducted first time at site Schäftlarnstraße Munich, Germany. One cable with two DAS fibers, DTS one downhole pressure/temperature gauge were clamped ¾-in. sucker rods installed 3.7 km measured depth collect data from after drilling, during testing, operations. We present profiles 3 months shut-in show results cold water injection tests localize inflow zones test performance setup. A vertical displacement peaks approximately 1.5 m observed tests, presumably resulting thermal contraction rod–cable This verified by analyzing strain information records 1 h warm-back calculated theoretical same period. further flowmeter measurements gradient velocity analysis injection. Intake major zone estimated 93.5% test, respective 94.0% second, intake 92.0% zone. Those values are confirmed period shut.
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ژورنال
عنوان ژورنال: Geothermal Energy
سال: 2021
ISSN: ['2195-9706']
DOI: https://doi.org/10.1186/s40517-021-00204-0