Blöcher, G.

Brandt, W.

Holl, H.-G.

Huenges, E.

Kranz, S.

Milsch, H.

Moeck, I.

Reinicke, A.

Saadat, A.

Zimmermann, G.

Earth-prints Repository

Well path design and stimulation treatments at the 
geothermal research well GtGrSk4/05 in Groß Schönebeck
Günter Zimmermann & Geothermics Group
GeoForschungsZentrum Potsdam
Geology of the Central European Basement
Paris
Bruxelles
London
Munich
Praha
Warszawa
Berlin
Hamburg
Kobenhavn
NEGB PT
NWGBNEB
DB
Nor
th S
ea
Ba
ltic
Se
a
Rotliegend
Tornquist zone
Variszican
belt
Variszican 
Deformation front
Caledonian 
Deformation front
Caledonides &
older massifs
Precambrian
crystalline
basement
Alps
Rh
eno
he
rcy
nia
n
Sa
xot
hu
rin
gia
n
Mo
lda
nu
bia
n
Al
pi
ne
fron
t
0 100 200 km
EGrSk3/90
GtGrSk4/05
(modified after 
Ziegler 1990, 
Bertelsen 1992, 
Brecht 1999)
well path
design of doublet and frac orientation
waterfrac simulation
Time (min)
0 1600 3200 4800 6400 8000
0
0
120
160
240
320
360
480
480
640
600
800
0
50
100
150
200
250
Surface Pressure  (bar) (473.20)
BHP from Frac Model  (bar) (685.75)
Total Friction  (bar) (206.87)
Time (min)
0 1600 3200 4800 6400 8000
0
5000
10000
15000
20000
25000
0
2
4
6
8
10
Slurry Total  (m3) (19776.05) Slurry Rate  (m3/min) (9.00)
waterfrac simulation
carbon
volcanics
conglomerates
sandstones
frac equipment
waterfrac treatment
0
100
200
300
400
500
600
700
800
900
1000
09.08. 10.08. 11.08. 12.08. 13.08. 14.08. 15.08.
time
p
r
e
s
s
u
r
e
 
[
b
a
r
]
0
1
2
3
4
5
6
7
8
9
10
f
l
o
w
r
a
t
e
 
[
m
³
/
m
i
n
]
pressure flowrate
0100
200
300
400
500
600
09. 08 10. 08 11. 08 12. 08 13. 08 14. 08 15. 08
time
p
r
e
s
s
u
r
e
 
[
b
a
r
]
0
2
4
6
8
10
12
g
a
u
g
e
 
[
m
]
interference with GrSk3
water level in GrSk3
pressure in GrSk4
end of waterfrac treatment
Time (min)
0 30 60 90 120 150
0
0
200
100
400
200
600
300
800
400
1000
500
0
0
120
16
240
32
360
48
480
64
600
80
BHP from WB Model and/or Data  (bar) 
Model Net Pressure  (bar) (153.42)
Surface Pressure  (bar) (274.50)
Total Friction  (bar) (10.09)
Time (min)
0 30 60 90 120 150
0
0
0
30000
0.80
10
60000
1.60
2
90000
2.40
3
1.2e+05
3.20
4
1.5e+05
4
5 0
0
0
300
4
600
8
900
12
1200
16
1500
20
Proppant Total  (kg) (118012.44)
Slurry Rate  (m3/min) (3.00)
Slurry Total  (m3) (421.63)
Proppant Concentration  (g/L) (0.00)
Proppant conc. in fracture  (kg/m2) (18
gel-proppant treatment in sandstones
( / 2)(18,38)
gel-proppant fracture dimensions
Time (min)
0 30 60 90 120 150
0
0
12
0.40
24
0.80
36
1.20
48
1.60
60
2
0
20
40
60
80
99
Fracture Length  (m) (49.97)
Average Width  (cm) (1.24)
Total Fracture Height  (m) (82.61)
Time (min)
0 30 60 90 120 150
0
10
20
30
40
50.00
0
10
20
30
40
50.00
Fracture Upper Height  (m) (43.22) Fracture Lower Height  (m) (39.39)
proppant concentration
0200
400
600
800
1000
1200
1400
09:00 10:00 11:00 12:00 13:00 14:00 15:00
time [hh:mm]
p
r
e
s
s
u
r
e
 
[
b
a
r
]
 
&
 
p
r
o
p
 
c
o
n
c
 
[
g
/
l
]
 
0
1
2
3
4
5
6
7
f
l
o
w
r
a
t
e
 
[
m
³
/
m
i
n
]
pressure proppant flowrate
1. gel proppant treatment
leakoff test
step rate test frac
gel proppant treatment
monitoring
0200
400
600
800
1000
1200
1400
09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00
time [hh:mm]
p
r
e
s
s
u
r
e
 
[
b
a
r
]
 
&
 
p
r
o
p
 
c
o
n
c
 
[
g
/
l
]
0
1
2
3
4
5
6
7
f
l
o
w
r
a
t
e
 
[
m
³
/
m
i
n
]
pressure prop conc flowrate
leak off test
step rate test
frac
2. gel proppant treatment
500 m³ gel(YF140/145) + 4% KCl
100 t   proppant(HSP 20/40coated/uncoated)
Pmax= 380 bar
Qmax = 58 liter/sec.
500 m³ gel(YF140/145) + 4% KCl
113 t    proppant(HSP 20/40coated/uncoated)
Pmax=   495 bar
Qmax =   66 liter/sec
13000 m³ water(pH5)
24 t  sand
Pmax  =     586 bar
Qmax =     150 liter/sec.
summary
next steps:
• additional perforations
• production test (CLT) incl. flowmeter log
• long term communication experiment
waterfrac simulation
Time (min)
0 1600 3200 4800 6400 8000
0
0
100
0.50
200
1
300
1.50
400
2
500
2.50
0
36
72
108
144
180
Fracture Length  (m) (262.17)
Average Width  (cm) (2.00)
Total Fracture Height  (m) (139.10)
Time (min)
0 1600 3200 4800 6400 8000
0
30
60
90
120
150
0
8
16
24
32
40
Fracture Upper Height  (m) (107.90) Fracture Lower Height  (m) (31.20)
proppant concentration


Well path design and stimulation treatments at the geothermal research well GtGrSk4/05 in Groß Schönebeck

http://www.earth-prints.org/bitstream/2122/2694/1/Zimmermann.pdf

Well path design and stimulation treatments at the geothermal research well GtGrSk4/05 in Groß Schönebeck

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