Transcript ENGINE-070111-17h05_id54-ghergut.ppt

Hydraulic stimulation
in the light of tracer tests
some comments on tracer tests results and
the presuppositions of their interpretation
I. Ghergut
University of Göttingen
Geothermics Group (Prof. Martin Sauter)
(Deep Continental Drilling, Germany)
t.t.: depleted, stimulated, post-stimulation state
1 - year
injection
1 - year
production
1 - year
production
(Deep Continental Drilling, Germany)
use different tracers, and rely on them!
tracer 1: values in this range
tracer 2: values in this range
(Deep Continental Drilling, Germany)
interpretation is only as good as the
assumptions made on tracer behaviour!
(Hydro-frac tracing in 4-km deep sedimentary)
2 organic tracers, very different behaviour!
(GroßSchönebeck: multi-tracer tests, forthcoming)
want to be able to rely on various organic tracers!
short-term, high-rate
long-term, moderate-rate
spend more effort to:
 improve tracer analytics in saturated brine
 understand physicochemical behaviour of
tracers in situ
University of Göttingen
Geothermics Group (Prof. Martin Sauter)