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Criteria for borehole logging instrumentation and research methods
in supercritical geothermal wells
Dr. Ragnar Ásmundsson, ÍSOR Keynote speaker at HADES, Taupo New Zealand
May 25-26 2011
HADES Taupo New Zealand May 2011
High Temperature Instrumentation for Supercritical Geothermal Reservoir Characterization and Exploitation
A European FP6 research and development project
Tools in hot environment
• Robust design (temperature, chemistry, mechanical etc.)
• Heat shielding • Communication • Tool effects (e.g during chemical sampling)
HADES Taupo New Zealand May 2011
Supercritical water environment
• ‘Combination of liquid and gas’ • Chemical reaction changes • Flow properties • Formation environment
HADES Taupo New Zealand May 2011
Achievements, 2007-2010
The HiTI project developed and field tested: • Temperature, pressure, flow and casing collar location for
400°C (memory tool). • Televiewer, natural gamma radiation spectral detection and
temperature to 300°C (wireline, continuous read-out). • Fiber optic temperature readout to 280°C. • Chemical tracers up to 350°C and geothermometry beyond
400°C. • Laboratory deformation and resistivity experiments at high
temperature and pressure.
HADES Taupo New Zealand May 2011
HiTI=High Temperature Instruments for Supercritical Geothermal Reservoir Characterization and Exploitation
Thoughts after end of HITI
• Resistivity probe developed but never field tested. • Other instruments fully tested but only tracer tests and
the slick-line tool test performed in the first IDDP well (that well was not drilled as deep as planned).
• These tools ‘open the window’ to supercritical well environment and are currently world cutting-edge geothermal tools that can also be used in conventional high temperature geothermal environment.
HADES Taupo New Zealand May 2011
HiTI MultiSensor in IDDP-1 well (CalEng)
HADES Taupo New Zealand May 2011
BRGM 300°C
wireline
HADES Taupo New Zealand May 2011
300°C natural gamma
radiation spectrum
gauge (ALT)
HADES Taupo New Zealand May 2011
300°C wireline televiewer (ALT)
HADES Taupo New Zealand May 2011
Images from ABI85-92 demonstration in NE-Iceland. Clockwise from top left: 1) Lowering of the combined natural gamma/televiewer into well K-18 (well without liner). 2) Going through the roof of the B-14 wellhead housing. 3) Inside the logging truck cabin, testing connections and 4) Going into ‘hot’ well B-14.
Logging data
HADES Taupo New Zealand May 2011
Televiewer images
HADES Taupo New Zealand May 2011
Fiber optic distributed temperature sensing from GFZ-Potsdam
HADES Taupo New Zealand May 2011
Fiber
Bronze wire
Stainless-steel loose tube
Water blocking yarn
Time-depth profiles from DTS fiber
HADES Taupo New Zealand May 2011
Tracer test
HADES Taupo New Zealand May 2011
Experimental comparison CNRS-UM2-Géosciences Montpellier
HADES Taupo New Zealand May 2011
TL 071 (3MHz,±2mV)
22 mm
10 mm
Top : experimental cell designed to measure the electrical conductivity at high pressure, high temperature and pore fluid pressure. On the right, experimental set-up adapted in the Paterson gas pressure vessel.
Suggestions to proceed
• Gauges tolerating 500-600°C, primarily temperature and pressure probes.
• Fluid sampler at 500°C. • More wireline tools to 300°C, e.g. vertical
seismic profiling, caliper (well width) and resistivity.
• Additional chemical methods (tracers and geothermometry) valid at more than 400°C.
HADES Taupo New Zealand May 2011
New Zealand
• Currently active geothermal development • Scientific knowledge • International collaboration • Government support • Industry interests – service and development
HADES Taupo New Zealand May 2011
Thank you
HADES Taupo New Zealand May 2011
