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GEOTHERMAL RESERVOIR ENGINEERING INTERNATIONAL SUMMER SCHOOL ON GEOTHERMAL GEOCHEMISRTY 02-15 June 2003 İzmir - TURKEY Prof. Dr. Mahmut PARLAKTUNA MIDDLE.

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Presentation on theme: "GEOTHERMAL RESERVOIR ENGINEERING INTERNATIONAL SUMMER SCHOOL ON GEOTHERMAL GEOCHEMISRTY 02-15 June 2003 İzmir - TURKEY Prof. Dr. Mahmut PARLAKTUNA MIDDLE."— Presentation transcript:

1 GEOTHERMAL RESERVOIR ENGINEERING INTERNATIONAL SUMMER SCHOOL ON GEOTHERMAL GEOCHEMISRTY June 2003 İzmir - TURKEY Prof. Dr. Mahmut PARLAKTUNA MIDDLE EAST TECHNICAL UNIVERSITY PETROLEUM AND NATURAL GAS ENGINEERING

2 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry RESERVOIR 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

3 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry RESERVOIR ENGINEERING ULTIMATE GOAL Determination of optimum production conditions to maximize the heat recovery from the reservoir under suitable economic conditions

4 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry 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

5 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry 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

6 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry SOME FACTORS SPECIFIC TO GEOTHERMAL 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

7 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry GEOTHERMAL SYSTEMS Required conditions A heat source A heat carrier (except HDR) Reservoir rock Caprock

8 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry GEOTHERMAL SYSTEMS (Dickson and Fanelli, 1995)

9 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry GEOTHERMAL SYSTEMS Vapor dominated systems Liquid dominated systems Geo-pressured reservoirs Hot dry rock (HDR)

10 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry ENERGY DENSITIES OF GEOTHERMAL SYSTEMS

11 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry ASSUMPTIONS 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

12 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry SCENARIOS Scenario-1 –Originally water, remaining water Scenario -2 –Originally water, becoming steam Scenario -3 –Originally steam, remaining steam

13 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry PHASE DIAGRAM

14 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry PHASE DIAGRAM

15 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry STEAM TABLES

16 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry SCENARIOS

17 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Scenario-1 Initially at 260  C h w1 = kJ/kg V w1 =  m 3 /kg E w1 =1.780  10 5 kJ/m 3 After 30 years production h w2 = kJ/kg V w2 =  m 3 /kg E w2 =  10 5 kJ/m 3 Energy produced from water E w = kJ/m 3 Energy produced from rock E r =22857 kJ/m 3 Total energy E a = kJ/m % from rock

18 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Scenario-2 Initially at 260  C h w1 = kJ/kg V w1 =  m 3 /kg E w1 =1.780  10 5 kJ/m 3 After 30 years production h s2 = kJ/kg V s2 =  m 3 /kg E s2 =  10 4 kJ/m 3 Energy produced from water E w-s = kJ/m 3 Energy produced from rock E r =22857 kJ/m 3 Total energy E a = kJ/m % from rock

19 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Scenario-3 Initially at 260  C h s1 = kJ/kg V s1 =  m 3 /kg E s1 =  10 4 kJ/m 3 Energy produced from steam E w =2080 kJ/m 3 Energy produced from rock E r =22857 kJ/m 3 Total energy E a = kJ/m % from rock After 30 years production h s2 = kJ/kg V s2 =  m 3 /kg E s2 =  10 4 kJ/m 3

20 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Volume of reservoir to supply a 100 MW power station with steam for a period of 30 years E elec = 9.46  J E thermal = 5  9.46  J (20 % efficiency) Scenario 1 V=  m 3 Scenario 2 V=  m 3 Scenario 3 V=  m 3

21 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Temperature measurements

22 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Negative Temperature Gradient

23 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Flowing well

24 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Closed well

25 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Temperature Profiles

26 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Well Completion Test Injection of cold wtaer into the wellbore The two main parameters measured Water loss Permeability

27 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Water Loss Test

28 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Example

29 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry Pressure Profiles

30 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry PRESSURE TRANSIENT TESTING BUILD-UP TEST

31 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry PRESSURE TRANSIENT TESTING BUILD-UP TEST Slope is proportional to PERMEABILITY

32 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry PRESSURE TRANSIENT TESTING DRAWDOWN TEST

33 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry PRESSURE TRANSIENT TESTING DRAWDOWN TEST Slope is proportional to PERMEABILITY

34 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry PRESSURE TRANSIENT TESTING INTERFERENCE TEST

35 İZMİR JENARUM YAZ OKULUJune 11, 2003 International Summer School on Geothermal Geochemistry TRACER TEST A tracer is an identifiable substance that can be followed through the course of a process Tracers - Radioactive tracers: NaI, NH 4 Br, I 131, Br 82, H 3 - Chemical tracers: NaCl, CaCl 2, - 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


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