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Sustainable Development Goals Short Course III on Exploration and Development of Geothermal Resources
George Moshe Dayan, Drilling Engineer-KenGen
INTRODUCTION TO GEOTHERMAL DRILLING
23rd November 2019
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
OUTLINE
Drilling Rigs
Introduction
2
3
1
4 Drilling Contracts
5 Personnel
Drilling Plan
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
INTRODUCTION
•Geothermal well drilling is the process of making a hole in the earth to extract thermal energy from the earth’s crust.
• It normally takes 55-65 days to drill to 3000m at an approximate cost of USD 5 Million
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
INTRODUCTION CONT’D-TYPES OF WELLS
•Exploration wells-can be slim holes/gradient holes
•Appraisal wells-
• Production wells
• Re-injection wells
•Make-up wells
•Work-over
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
INTRODUCTION CONT’D-DRILLING PHASES
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
DRILLING RIGS
A drilling rig is an equipment that is used for drilling
geothermal wells:Electrical,mechanical,Hydraulic-Perfoms the
following:
•Hoisting-Hold the drill string and apply weight on the bit
• Rotation- provide rotary motion to the drill bit
• Circulation- flush out drilled cutting out of the hole
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
DRILLING RIGS- DRILL STRING COMPONENTS
•Bit
•Mud motor
•Bit sub
• Stabilizers/reamers
•Cross over
•Collars/monel
•Heavy weight Drill pipe/drill pipes
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
DRILLING PLAN
•Quality-Targeted resource, reservoir quality, life of the well
•Cost-Optimizing of costs(key in keeping electricity costs
down)
• Safety/Environment management-Ensure safety of
personnel,equipment,environment
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
DRILLING PLAN- DRILLING PROGRAM
Prepared by a drilling engineer ,main contents include:
• Well Prognosis-Provided by the geologist
• Rig/equipment information
• Casing Design
• Bit Design
• Drilling fluid Program
• Waste management/EMP
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
DRILLING PLAN- WELL DESIGN
The design of a geothermal well entails the following key
aspects:
• The purpose of the well/targeted resource
• Type of the well; vertical or directional
• Reservoir conditions- pressures, temperature
•Existing surface or shallow hole conditions
•Anticipated drilling challenges
• Casing requirements
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
DRILLING PLAN- WELL DESIGN
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
DRILLING PLAN- SPECIALIZED SERVICES
•Directional drilling
•Cementing
• Stuck pipe and fishing
•Drill pipe inspection
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
DRILLING CONTRACTS
An operating company may hire a contractor to drill the well. Different
types of contracts may be entered into:
• Day rate contracts.
• Modified day rate (footage bonus) contracts:
• Footage contracts:
• Turnkey contracts
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
RIG PERSONNEL
SDG Short Course IV on Exploration and Development of Geothermal ResourcesOrganized by UNU-GTP and KenGen | Lake Bogoria and Lake Naivasha | Nov 14-4 Dec, 2019
INFORMATION
Name of course: SDG Short Course III on Exploration and Development of Geothermal Resources
Location: Lake Bogoria and Lake Naivasha, Kenya
Timing: November 14-December 4, 2019
Organized by: United Nations University Geothermal Training Programme (UNU-GTP) and Kenya Electricity Generating Company (KenGen)
Financed by: UNU-GTP and KenGen
Presentation author(s): George Moshe Dayan ([email protected])
KenGen Plc
P.o Box 784 20117 Naivasha Kenya
www.kengen.co.ke