Title: Ernst Huenges www.gfzpotsdam.degeothermSan Diego GRC2006 September 12 1
1- Current status of the EGS Gross Schönebeck
project on the way to demonstrate sustainable
brine production from deep sediments of the North
German basin - Ernst Huenges, Ali Saadat, Wulf Brandt, Inga
Moeck, Heinz Holl, Günter Zimmermann, Guido
Blöcher, Silke Köhler, Björn Legarth, Torsten
Tischner, - GeoForschungsZentrum Potsdam (GFZ)
2(No Transcript)
3Geology NE German Basin
NE German Basin
Scheck Bayer,1999
Poland Basin
Lamarche et al.,2005
4Local geology Groß Schönebeck
Moeck et al., 2006
5Integrated Geophysical Exploration Technologies
for Deep Fractured Geothermal Systems (I-GET)
Berlin
10
0
6In-situ Geothermal Laboratory Groß Schönebeck
7In-situ Geothermal Laboratory Groß Schönebeck
- research borehole in sedimentary rocks
- 4.3-km deep, 150 C with stimulated
reservoir - drilling 2. well and concept to enhance
mass-flow rate from the reservoir using a
doublet - demonstration sustainable production with
longterm circulation -
- geothermal power production in the North German
Basin
8productivity enhancement by hydraulic fracturing
- creating zone of increased permeability
- enlarging apparent wellbore radius
- by-pass skin
- improve inflow conditions
9Operations overview
- open hole fracs with packer(injecting 100 m³
gel, 7 to proppants, cidric acid)
-
- open hole waterfrac (injecting
11,575 m³ (pH5- acid) conditioned water) -
- preparation 2. well
- injection test reservoir modelling
- EU-tender for drilling services
- Mining rights procedure
- Design of drilling program setup
of the drillsite
10waterfrac Nov/Dec 2003
? HP triplex pumps ? 80 l/s bei 500 bar ? 4000 kW
? wellbore completion ? frac string installation
? 1500 m³ storage ? acidization ? filter systems
11production test Groß Schönebeck 1.12.03
- productivity index 14 m³/(h MPa) _at_
fracture opening/closure pressure - enhanced from 0.6 m³/(h MPa)
12Injection pressure temperature around the wells
30 a
Production well
Injection well
thermal water loop with 75 m³/h
13 Ongoing Drill 2. well and realise the doublet
- 2006/2007
- Drill 2.well (directional, balanced)
- multifracturing
- Commitment of the energy provider Vattenfall
- 1. Primar productivity for 750 kW-power plant2.
Demonstration of sustainibility (circulation
test)
Directional drilling concept 2.well
14Start of drilling 2.wellin Groß Schönebeck
15Status 2. well in Groß Schönebeck
Status 2006 September 9th, 3827 m soon entering
the reservoir
16Forthcoming tests in Groß Schönebeck
17Step 2 Installation of the geothermal power plant
2007Demonstration of geothermal power production
(partner in industry Vattenfall Europe AG) -
demonstration - optimisation of the
processes- improving efficiency
18Conclusions
- Experiences in a case study of a deep sedimentary
reservoir with several hydraulic fracture
treatmentsgt evaluation of a EGS reservoir
created by hydraulic fracturing in sandstone and
volcanic rocks - Concept based on parallel fracs and
transmissibility within the formationgt
reservoir performance (not shown fracture
mapping, geochemistry) - on the way geophysical methods (I-GET funded by
EU) - Groß Schönebeck site since 2001, with 10 MW
thermal power _at_ 140 C expected after drilling
and enhancing the second borehole - Groß Schönebeck research test site to develop
deep sedimentary geothermal reservoirs -