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Geothermal Drilling in Enel Green Power
October 2013
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Larderello, the heart of geothermal industry
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…at the beginning of the geothermal development (20th century)
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Drilling rigs evolution
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At the beginning of 20th century… now …..
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Enel Green Power drilling department capabilities includes:
• Wells design
• New wells drilling
• Workover or deepening activities on existing wells
• Peculiar activities management:
Drilling mission
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� Drilling Supervision
� Cementing jobs, stimulations
� Mud service
� Mud logging
� Fishing Operations
• Well plug and abandonments, debris management,
environmental restore
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Drilling Unit Organization Chart
Drilling Unit
Development Operation Machinery Management Cements and Fluids
International ActivitiesPool
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• Design of mining activities
• External resources planning and managing
• Support activities(Quality, Safety, Environment, Permitting, Fuel management)
• Drilling site management
• Drilling site supervision
• Drilling shift
• Management and logistics of rigs and drilling equipments
• Rigs Maintenance
• Technical support
• Move-in, Move-out
• Design of cements and fluids
• Operation of cementing unit
• Cements and fluids Laboratory
DevelopmentTeam Team and Maintenance Team Team
Functions involved in international projects
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Geothermal Italian Wells
Production n. 310 Reinjection n. 63 Control n. 118
Increase in the complexity
10264
92
233
0-1000 1000-2000
2000-3000
> 3000
No Wells by Depth (m)No Wells by Depth (m)
Increase in the complexity
The evolution is due to:
- reduction of noise
- separation of condensate
- treatment of fluids inside wells
Tot. 491
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Geothermal drilling
State of art
• HIGH AVERAGE DEPTH OF WELLS (FROM 3500m TO 4500m)
• DIRECTIONAL DRILLING ON SPECIFIC TARGETS
• DEVELOPMENT OF CEMENTING TECHNOLOGIES FOR DEEP AND HIGH TEMPERATURE WELLS
• DEVELOPMENT OF BEST PRACTICE AND GEOTHERMAL ORIENTED TOOLS
• SAFETY AND ENVIRONMENTAL COMPLIANCE
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Exploration wells are drilled to hit the targets defined by mining exploration department
Vertical, directional or multilateral wells
1 to 5 wells drilled from the same pad
at depth of 1000 ÷ 4500 m Montieri 1well
Production
over 240 t/h of steam
Geothermal drilling
ADVANCED RIG
• capacity 5500m
• soundproof technology
• automatic trailer-mounted rig
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Depth <1500 m
Depth 1500
3000 m
Depth 3000
5200 m
Total
New wells 193
Vertical 30 15 29 74
Directional 8 36 72 116
Multi Lateral 0 1 1 2
Horizontal 1 0 0 1
EGP Italy activity from 1990 to 2012
Horizontal 1 0 0 1
Slim Holes - - - 2
Workovers
- - - 106
Well plug and abandonments
- - - 314
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Depth <1500 m
Depth 1500
3000 m
Depth 3000
5200 m
Total
New wells 4
Vertical 0 0 2 2
Directional 0 1 1 2
Slim Holes 0 0 0 0
EGP Italy activity in 2012
Slim Holes 0 0 0 0
Workovers
- 3 5 8
Well plug and abandonments
- - - 3
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HH300 Automatic track-mounted rig
Mas 6000 E
EGP drilling rigs
Type
n°
Maximum
input power
HP
ActuatedHook load
capacity
(t)
Set-back
capacity
(t)
Gross nominal
capacity
(ton)
HH 300 E 1 1540 Diesel-Hydraulic 272 272 \ \
Mas 6000 E 5 1700 453 272 604
MR 7000 E 1 700 159 113 227
ST6 1 175 Diesel 50 40 70
Diesel-Electrical
All the rigs are sound proof
Rigs detailed list
3 rig crews operating 365 days/year23
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1981-Greece – Milos Island: 3 wells drilled
1984-China -Tibet: Yangbaijing field characterization
1985-Hawaii: Puna field development project
1989-Bolivia - Laguna Colorada: 5 wells drilled
1985-Turkey: Kizildere field well tests and production optimization
1992-Nicaragua, Indonesia, Philippine: Research
International drilling activities in the past
1992-Nicaragua, Indonesia, Philippine: Research and development of several geothermal fields
2001-France - Soultz: 2 wells drilled and technical support of the HDR project
2003-Salvador: Total development of wells for a new 40MW geothermal power plant
2005-U.S.A.: Total development of wells for 3 new geothermal power plants
2008-Chile – El Tatio, Apaceta: 5 exploration wells drilled, ground level at 4500m
2012-Turkey – Alasheir, Simav, Gediz: 7 exploration slim hole wells drilled
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Drilling activities plannedin 2014÷2015
USA
(Still Water exploitation)
N°1 Shallow Well 2013/2014
Linea 1
Linea 2
Linea 3
Slim Holes Ricerca
2014
• Perforazione in Italia(3 equipaggi)
• Cerro Pabellon Chile
• Perù
• USA
• TurkeyMexicoSalvador
1st Q
2nd Q
3rd Q
4th Q
Linea 1
Linea 2
Slim Holes Chile
2015
Supporto tecnico
1st Q
2nd Q
3rd Q
4th Q
Perù
(exploration)
N°1 SH 2014 + n°1 SH 2015
Slim Holes
Shallow well
Chile
Cerro Pabellon (100MW)
N°26 wells 2014÷2018
Italy (740MW)
Exploitation with three crews
An average of 6 wells per year
Exploration: 4 slim holes
Ingegneria a supporto
Attività di Cantiere
Chile (exploration)
N°1 SH 2013 + n°1 SH 2014
SH: pozzo slim hole
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International Drilling activities: ChileCerro Pabellon deep exploration
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