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Fiber Optic Distributed Acoustic Sensing for Periodic Hydraulic Tests

Active Dates: 2014-Current

Participants: CSULB: Matt Becker, Matt Cole, Chris Ciervo,Michael Hodges
Silixa: Thomas Coleman, Michael Mondanos
Collaborators: Adam Hawkins, Jefferson Tester, Cornell University
Geomechanics Technologies

Support: DOE Geothermal Technolgies Program; DOE STTR Program

Enhanced Geothermal Systems (EGS) are create in naturally hot rock with low permeability. Permeability can be increased through artficial hydraulic fracturing, but too much fracturing can lead to short circuiting in circulation wells, too little to poor fluid recovery. The purpose of this project is to test the ability of hydraulic and tracer tests to estimate connectivity between wells to support efficient design and prediction of heat recovery.

We performed hydrualic and heat/solute tracer experiments at the Mirror Lake Fractured Rock Research Site. These tests allowed us to measure the hydraulic connection among wells, such as might be done in a geothermal field. A novel aspect of these experiments is that we are attempting to measure periodic hydrualic (pumping) signals through the use of a fiber optic sensor designed for acoustic sensing. Currently we are working on laboratory experiments to calibrated DAS strain sensing to traditional strain meters

Thomas Coleman (Silixa) Monitoring Fiber Optic Distribute Temperature and Distribute Acoustic Sensing Equipment



Matt Cole helps set packers in wells