st1 Deep Heat Drilling to Resume

By Peter Malin, SMU Adjunct Faculty

Peter Malin, an Adjunct Faculty in the SMU Huffington Department of Earth Sciences provided this update on the st1 Deep Heat project in Espoo, Finland.  Peter’s company Advanced Seismic Instrumentation & Research (ASIR) is providing seismic monitoring for the project.

Following a hiatus, drilling is set to resume on the st1 Deep Heat project in Finland.  The well OTN-II has been drilled to a depth of 3325 m with air hammer.  OTN-III has been drilled to a depth of 4,500 m with air hammer.   The new seismic array has been purchased and a special borehole is being prepared for its installation.

ASIR seismic equipment ready for installation in Finland.
ASIR seismic equipment ready for installation in Finland.

The deeper phase of drilling will begin on OTN-III where a water hammer will be used to drill from 4,500 m to 5,000 m.  The well will then be logged with a caliper and sonic.  From 5,000 m to 6,000 m the well will be deviated to ~45° using Tricone mud drilling.  The final phase of drilling on OTN-III will continue straight (with the 45°deviation) to the target depth of 7,000 m using water hammer.

Following drilling, OTN-III will undergo stimulation.  ASIR will be monitoring the stimulation using micro earthquakes (MEQ).  Stimulation is scheduled for September 2017.

ASIR working with a digital array.
ASIR working with a digital array.

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