GEOTHERMAL RESERVOIR GEOTHERMAL RESERVOIR ENGINEERING ENGINEERING INTERNATIONAL SUMMER SCHOOL ON GEOTHERMAL GEOCHEMISRTY 02-15 June 2003 İzmir - TURKEY Prof. Dr. Mahmut PARLAKTUNA MIDDLE EAST TECHNICAL UNIVERSITY PETROLEUM AND NATURAL GAS ENGINEERING
GEOTHERMAL RESERVOIR ENGINEERING. Prof. Dr. Mahmut PARLAKTUNA MIDDLE EAST TECHNICAL UNIVERSITY PETROLEUM AND NATURAL GAS ENGINEERING. INTERNATIONAL SUMMER SCHOOL ON GEOTHERMAL GEOCHEMISRTY 02-15 June 2003 İzmir - TURKEY. RESERVOIR ENGINEERING. Determination of well locations - PowerPoint PPT Presentation
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INTERNATIONAL SUMMER SCHOOL ONGEOTHERMAL GEOCHEMISRTY
02-15 June 2003İzmir - TURKEY
Prof. Dr. Mahmut PARLAKTUNAMIDDLE EAST TECHNICAL UNIVERSITY
PETROLEUM AND NATURAL GAS ENGINEERING
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
RESERVOIR ENGINEERINGRESERVOIR ENGINEERING
Determination of well locations Planning and interpretation of well measurements (well logging, production rates, etc.) Determination of production mechanism Performance prediction studies of reservoir behavior
June 11, 2003International Summer School on Geothermal Geochemistry
Determination of optimum production conditions to maximize
the heat recovery from the reservoir under suitable economic conditions
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
QUESTIONS TO BE ANSWERED QUESTIONS TO BE ANSWERED
Most suitable development plan of the reservoir Number of wells with well pattern Production rates of the wellbores Heat that will be recovered Change in reservoir temperature with time Enhanced recovery techniques to increase the heat recovery from the reservoir
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
STEPS STEPS
Define the physical processes and develop the conceptual model of the reservoir Determine the physical and chemical properties of reservoir rock and fluid Develop the mathematical and physical models of the reservoir with the help of existing data. Define initial and boundary conditions
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
SOME FACTORS SPECIFIC TO SOME FACTORS SPECIFIC TO GEOTHERMAL RESERVOIRSGEOTHERMAL RESERVOIRS
Relatively high reservoir temperatures Volcanic origin of rocks with highly fractured characteristics Chemical precipitation of solids within the reservoir during production Boiling of water within the reservoir and/or wellbore
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
GEOTHERMAL SYSTEMS GEOTHERMAL SYSTEMS
Required conditions A heat source A heat carrier (except HDR) Reservoir rock Caprock
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
GEOTHERMAL SYSTEMS GEOTHERMAL SYSTEMS
(Dickson and Fanelli, 1995)
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
GEOTHERMAL SYSTEMSGEOTHERMAL SYSTEMS
Vapor dominated systems Liquid dominated systems Geo-pressured reservoirs Hot dry rock (HDR)
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
ENERGY DENSITIES OF GEOTHERMAL ENERGY DENSITIES OF GEOTHERMAL SYSTEMSSYSTEMS
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
ASSUMPTIONSASSUMPTIONS
A hypothetical geothermal reservoir– Porosity = 20 %– Initial pressure = 47 bar– Initial temperature = 260 C– 7 bar pressure decline due to fluid production– The reservoir fluid is at either saturated liquid
or saturated vapor state
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
SCENARIOSSCENARIOS
Scenario-1– Originally water, remaining water
Scenario -2– Originally water, becoming steam
Scenario -3– Originally steam, remaining steam
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
PHASE DIAGRAMPHASE DIAGRAM
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
PHASE DIAGRAMPHASE DIAGRAM
June 11, 2003International Summer School on Geothermal Geochemistry
İZMİR JENARUM YAZ OKULU
STEAM TABLESSTEAM TABLEST T P vliquid vsteam Hliquid Hsteam Hsb Sliquid Ssteam
- Chemical tracers: NaCl, CaCl2,- Organic Dyes: Fluoresceine, Rhodamine-B, Methylene Blue- Conventioanl tracers are identified by conventional analytical methods such as CONDUCTIMETRY, SPECTROMETRY-Radioactive tracers are detected by the emitted radiation