Conventional Logging - geothermal wells
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1 Conventional Logging - geothermal wells Thomas Schulte, Heinz-Gerd Holl GeoForschungsZentrum Potsdam Section 5.2 Geothermics Drilling cost effectiveness and feasibility of high-temperature drilling - Reykjavik, Iceland, ÉNGINE Workshop4
2 Content Key questions Tools and purposes sedimentary environment hard rock environment Logging in typical EGS systems Economics Conclusions
3 Key questions EGS project feasibility Temperature Pressure Brine chemistry & gas content Potential production rates Reservoir Lithology Porosity primary / secondary? Permeability primary / secondary? secondary - joints, open or sealed? Saturand water / steam? Structure where are we? - geosteering
4 EGS project classes & poro/perm type Evaluation procedures Degree of complexity Structural features Lithology Φm Φf km kf deep shallow deep sediments granites volcanics metamorphics matrix & fractures fractures Standardisation Lithology Structural features Φf kf
5 EGS project classes & poro/perm type New Area + Exploration well Development well Logging effort Reservoir complexity Granites Volcanics Metamorphics Sediments
6 Classical wireline tools Tool Types Schlum. B.-Atlas Induction and/or Resistivity devices DIL / DLL / ES DIFL / DLL / EL Micro resistivity MSFL ML Litho-density and Neutron porosity LDT/CNL CDL/CNL Acoustic monopole / dipole LSS / DSI ACL / DAC Caliper CAL CAL Natural Gamma / Spectral Gamma GR / NGS GR / SPL Spontaneous Potential SP SP Dipmeter SHDT HRDIP Pressure and Temperature RFT / HRT FMT / TEMP Rock and fluid sampling device CST SWC Acoustic and electric image device UBI / FMI CBIL / HDIP
7 Detection of fractures CAL borehole rugosity and breakouts can indicate a fractured zone. DT, RHOB, NPHI makes use of the difference between total porosity and matrix porosity. GR SN,LN may detect clay filled fractures. can indicate fluid filled fractures. DSI IMMAGE LOGS attenuation of stoneley waves. Direct fracture detection.
8 Logging volcanics - Iceland Schlumberger HRT / CAL / GR / CNL / ES / CBL HRT / CAL / GR / CNL / ES / RFT HRT / CAL / CDR Baker Atlas TEMP / CAL / GR / EL / CNLog ACBL TEMP/ CAL / GR / EL / CNLog / FMT TEMP / CAL / total drilling Kuster KTP / recovery Lithological discrimaination necessary, but relative homogenious volcanic deposits, no complex lithology no great attention needed for existing fracture networks << fractures exclusively induced by thermal fracturing! Data source: Steingrimsson et. al. & Thorhalsson et. al. 2003
9 Logging metamorphics - Larderello & Travale Schlumberger CAL / GR / NGS / CNL / LSS FMI / FMS Baker Atlas CAL / GR / SPL/ CNL / ACL CBIL Lithological discrimaination and stratigraphic reconstruction Structural reconstruction - breakout analysis Calibration of seismic and gravimetric surveys Evaluation of elastic parameters for fracture identification Detailed fracture analysis Data source: Batini, F., et. al. 2002
10 Logging garnites - Soultz-sous-Forêts Schlumberger GR / CAL / NGS / LDT / BHC Baker Atlas GR / CAL / SPL / CDL / ACL lithological / petrographical discrimination Schlumberger UBI / FMI Baker Atlas CBIL / HDIP fracture ( network ) identification and description Schlumberger CFS / HCFS / HCFT Baker Atlas FMCS identification of flow zones Data source: Sausse J. et.al, 2006
11 Logging program Groß Schönebeck Reykjavik, July 3, 2
12 Logging - economics 5 % - 15 % of overall drilling costs Data source: Tracs logging taining Manual 3 % of overall drilling costs Data source: Legarth, B ,5 % - 5 % of overall drilling costs Data source: GrSk 4 Holl Production Test 30 % - 70 % of logging costs Data source: Brandt
13 Conclusions Clear need for further Standardisation Make use of all available data Production data drilling data, core information mudlug data Target oriented logging program as simple as possible as complicated as necessary Take an interdisciplinary approach Further research should be directed into economics of acquiring wireline data wireline vs. MWD/LWD wireline vs. Pipe conveyed / shuttle wireline vs. well tests
14 Thank you very much for your attention!!
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