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Elements governing the ratio (Hydraulic Performances)/(Induced Microseismic Nuisances) during the stimulation of “EGS Soultz type” reservoirs. |
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The results observed during the past twenty years at Soultz demonstrated
that “usual” hydraulic stimulation techniques when applied in such an
hydrothermal/tectonic context can provide both real, but unfortunately limited,
improvements of the wells hydraulic performances and real, but fortunately up to now
limited, microseismic nuisances. Seven major hydraulic stimulation tests performed
at Soultz generated always large “microseismic clouds” but quite variable
improvement of the wells hydraulic performances.
The questions about the possible usefulness of that induced microseismicity in the
situation of Soultz came to light progressively. Despite all efforts and very
large “microseismic clouds” the hydraulic results from the stimulation tests up to
now resulted in injectivity indexes which were limited within a range 3 to 5 l/s/MPa
(target being 10 to 20).
Those questions became definitely unavoidable after the stimulation of the well GPK3
performed at Soultz in 2003 at depth ~4750m. During that test (including a dual
stimulation with a second well) ~34 000 m3 of water where injected in GPK3 at mean
flow ~50 l/s generating ~90 000 events [among which 39 of magnitudes high enough
(1.9
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Id: |
12 |
Place: |
Kartause Ittingen, Switzerland CH-8532 Warth TG
www.kartause.ch |
Starting date: |
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Duration: |
20' |
Primary Authors: |
GERARD, André (GEIE Exploitation Miniére de la Chaleur) |
Co-Authors: |
CUENOT, Nicolas (GEIE Exploitation Miniére de la Chaleur) CHARLETY, Jean (Institut de Physique du Globe (UMR7516)) DORBATH, Louis (Institut de Physique du Globe (UMR7516)) DORBATH, Catherine (Institut de Physique du Globe (UMR7516)) GENTIER, Sylvie (Bureau de Recherches Geologiques et Miniéres) HAESSLER, Henry (Institut de Physique du Globe (UMR7516)) |
Presenters: |
GERARD, André |
Material: |
Paper Slides |
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