Geothermal Drilling in Enel Green Power. October 2013

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Julie Harrington
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1 Geothermal Drilling in Enel Green Power October 2013

2 Larderello, the heart of geothermal industry at the beginning of the geothermal development (20 th century) 2 2

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15 Drilling rigs evolution At the beginning of 20 th century now

16 Drilling mission Enel Green Power drilling department capabilities includes: Wells design New wells drilling Workover or deepening activities on existing wells Peculiar activities management: Drilling Supervision Cementing jobs, stimulations Mud service Mud logging Fishing Operations Well plug and abandonments, debris management, environmental restore 16 16

management: Drilling Supervision Cementing jobs, stimulations Mud service Mud logging

17 Drilling Unit Organization Chart Drilling Unit International Activities Pool Development Operation Machinery Management Cements and Fluids Team Team and Maintenance Team Team 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 Functions involved in international projects 17 17

management) Drilling site management Drilling site supervision Drilling shift Management and logistics of rigs and drilling equipments Rigs Maintenance

18 Geothermal Italian Wells Uso: inserire classificazione Production n. 310 Reinjection n. 63 Control n. 118 Increase in the complexity 233 No Wells by Depth (m) Tot The evolution is due to: -reduction of noise -separation of condensate -treatment of fluids inside wells >

118 Increase in the complexity 233 No Wells by Depth (m) 102 64 Tot.

19 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 19

CEMENTING TECHNOLOGIES FOR DEEP AND HIGH TEMPERATURE WELLS DEVELOPMENT OF

20 Geothermal drilling 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 m Montieri 1well Production over 240 t/h of steam ADVANCED RIG capacity 5500m soundproof technology automatic trailer-mounted rig 20

drilled from the same pad at depth of 1000 4500 m Montieri 1well Production over 240

21 EGP Italy activity from 1990 to 2012 Depth <1500 m Depth m Depth m Total New wells 193 Vertical Directional Multi Lateral Horizontal Slim Holes Workovers Well plug and abandonments

22 EGP Italy activity in 2012 Depth <1500 m Depth m Depth m Total New wells 4 Vertical Directional Slim Holes Workovers Well plug and abandonments

23 EGP drilling rigs Type n Maximum input power HP Rigs detailed list Actuated Hook load capacity (t) Set-back capacity (t) Gross nominal capacity (ton) Mas 6000E HH 300 E Diesel-Hydraulic \\ Mas 6000 E Diesel-Electrical MR 7000 E ST Diesel All the rigs are sound proof HH300 Automatic track-mounted rig 3 rig crews operating 365 days/year 23

24 International drilling activities in the past 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 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 24

25 Drilling activities planned in Perforazione in Italia (3 equipaggi) Linea 1 Linea 2 Linea Uso: inserire classificazione 2015 Slim Holes Ricerca Cerro PabellonChile Linea 1 Linea 2 USA (Still Water exploitation) N 1 Shallow Well 2013/2014 Perù Slim Holes Chile Slim Holes USA Shallow well Perù (exploration) N 1 SH n 1 SH 2015 Turkey Mexico Salvador Supporto tecnico 1st Q 2nd Q 3rd Q 4th Q 1st Q 2nd Q 3rd Q 4th Q Chile Cerro Pabellon(100MW) N 26 wells Ingegneria a supporto Attività di Cantiere Chile (exploration) N 1 SH n 1 SH 2014 Italy (740MW) Exploitation with three crews An average of 6 wells per year SH: pozzo slim hole Exploration: 4 slim holes 25

26 International Drilling activities: Chile Cerro Pabellon deep exploration Uso: inserire classificazione 26

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Hot Rocks Geothermal Drilling, Operations and Insurance Implications Gary Mawditt MatthewsDaniel London September 28, 2012 Geothermal Drilling, Operations & Insurance Implications What is it / Where is