Slim-Hole Induction Tool (SIND): Field Evaluation @ Batu Dam, Gombak   May 11 th  2010
Contents <ul><li>Introduction  </li></ul><ul><li>Location & Background </li></ul><ul><li>Field Operation  </li></ul><ul><l...
<ul><li>Introduction To check on the tool’s performance against a known  fluid conductivity in large water bodies and to e...
Location
<ul><li>  Background Induction log is a very useful tool to study subsurface stratigraphy and formation conductivities in ...
<ul><li>  Background Interpretively, low conductivity value (i.e 50mS/cm) indicate very fresh water while high conductivit...
<ul><li>  Background The tool has been 1st order-calibrated in RG’s factory in the UK. A 2nd order calibration can be done...
Field Operation 60m walk-way to the intake tower 6.0m drop
Station
Set-up Depth encoder Winch Rope to secure the wheel Tool’s Cable 12V DC for winch 12V DC for micrologger
Equipment Conductivity Meter model WTW Multi 350i Sign as in slide #9
Equipment centralizer Calibration loop from RG Induction (SIND) tool Flow-meter tool
Definition <ul><li>Conductivity(Siemens) = 1/ resistivity (ohm.m) </li></ul><ul><li>Standard units of conductivity = micro...
Data Collected  <ul><li>Fluid conductivity (microS/cm) by Conductivity meter  </li></ul><ul><li>Conductivity in (mS/m); Ga...
Tabulated Data Cond. meter possibly needs lab calibration ELOG’s data needs comparing  with external data for integrity ch...
Log Analysis <ul><li>Example 1 –  shows tool’s min. operating range for resistivity is “zero” Ohmm </li></ul><ul><li>Examp...
Example 1 - Batu Dam    Showing “zero” conductivity readings before tool reaches water surface   Slide 18: SIND data_run01...
Air column – “zero” conductivity Possible humidity effect Water surface (Tool’s min. range reached)
Air column – “zero” conductivity Possible humidity  effect Water surface (Tool’s min. range reached)
EXAMPLE 2 - Batu Dam   ELOG’s short resistivity  vs. SIND’s derived resistivity in open water bodies   Slide 21: SIND Data...
86Ohm.m ~11.9mS/m (119µS/cm) (Value couldn’t hit beyond 100Ohmm due to to tool’s max. range reached unlike ELOG)
257Ohm.m Conductivity=10^4/Ohmm = 10000/257 = 38.9 ~ 39µS/cm See slide#15 under ELOG
EXAMPLE 3- KLT017 (alluvium)  ELOG’s short resistivity  vs. SIND’s derived resistivity in Alluvium   Slide 24: SIND Data  ...
SIND’s; 15.46Ohmm
ELOG’s; 23.55Ohmm
EXAMPLE 4 - SK198 (hard-rock)  ELOG’s short resistivity  vs. SIND’s derived resistivity in hard rock.   Slide 27: SIND Dat...
2.11 Ohmm
12.93 Ohmm
Conclusion 1. A consistent shift in resistivity values are observed from that of SIND & ELOG tools  in alluvial and hardro...
Acknowledgements 1. DID, Northern Zone Div., Federal Territory – Tuan Hj Zul Mohamad, Mohd Ezla, Izrul Faris, Bachtiar Eff...
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RG's SIND tool evaluation at batu_dam

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Slim Induction (SIND) tool by RG as evaluated by SDWRP team at Batu Dam in Ulu Yam to check on tool's capabilities in non-well (open) environment

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  • Batu Dam is DID’s rainfall and water level station#3117190. Therefore, no conductivity data collected and available for comparison
  • SIND tool side by side with flowmeter as comparison scale. Approximately 30mm in diameter
  • RG's SIND tool evaluation at batu_dam

    1. 1. Slim-Hole Induction Tool (SIND): Field Evaluation @ Batu Dam, Gombak May 11 th 2010
    2. 2. Contents <ul><li>Introduction </li></ul><ul><li>Location & Background </li></ul><ul><li>Field Operation </li></ul><ul><li>Data Collected </li></ul><ul><li>Log Analysis </li></ul><ul><li>Conclusion </li></ul>
    3. 3. <ul><li>Introduction To check on the tool’s performance against a known fluid conductivity in large water bodies and to establish the percentage of tool’s accuracy under controlled conditions (min. borehole influence) against ELOG tool. Also, to compare both log response in various environments; alluvial, hard rock and open water bodies </li></ul>
    4. 4. Location
    5. 5. <ul><li> Background Induction log is a very useful tool to study subsurface stratigraphy and formation conductivities in water well. It uses EMF (~40KHz) to induce formation’s magnetic field which induced formation’s current flow which is proportional to formation’s conductivity. It works best in low resistivity (<100ohmm) formation or non-conductive medium (air). </li></ul>
    6. 6. <ul><li> Background Interpretively, low conductivity value (i.e 50mS/cm) indicate very fresh water while high conductivity value (i.e 1000mS/cm) indicates salty water. Resistivity is a reciprocal of conductivity. Hence, the former can be computed from that of the latter. </li></ul>
    7. 7. <ul><li> Background The tool has been 1st order-calibrated in RG’s factory in the UK. A 2nd order calibration can be done using the available calibration loop with a known max. conductivity value. A ‘zero’ calibration can be done by holding the probe up in the air though practically it’s none existent (only in the vacuum). </li></ul>
    8. 8. Field Operation 60m walk-way to the intake tower 6.0m drop
    9. 9. Station
    10. 10. Set-up Depth encoder Winch Rope to secure the wheel Tool’s Cable 12V DC for winch 12V DC for micrologger
    11. 11. Equipment Conductivity Meter model WTW Multi 350i Sign as in slide #9
    12. 12. Equipment centralizer Calibration loop from RG Induction (SIND) tool Flow-meter tool
    13. 13. Definition <ul><li>Conductivity(Siemens) = 1/ resistivity (ohm.m) </li></ul><ul><li>Standard units of conductivity = microS/cm </li></ul><ul><li>microS/cm = 10^4/ohm.m </li></ul>
    14. 14. Data Collected <ul><li>Fluid conductivity (microS/cm) by Conductivity meter </li></ul><ul><li>Conductivity in (mS/m); Gamma in CPS plus (derived bulk resistivity) by SIND tool </li></ul><ul><li>SNR, LNR(Ohmm); SP (mV); SPR (Ohm); Gamma (CPS) by ELOG tool </li></ul><ul><li>No available conductivity data in DID’s archive for comparison and data integrity checking </li></ul>
    15. 15. Tabulated Data Cond. meter possibly needs lab calibration ELOG’s data needs comparing with external data for integrity check Resistivity data Off recommended range for SIND tool
    16. 16. Log Analysis <ul><li>Example 1 – shows tool’s min. operating range for resistivity is “zero” Ohmm </li></ul><ul><li>Example 2 – shows tool’s max. operating range for resistivity ~100 Ohmm </li></ul><ul><li>Example 3 – Shows log response in alluvial </li></ul><ul><li>Example 4 – Shows log response in hard rock </li></ul>
    17. 17. Example 1 - Batu Dam Showing “zero” conductivity readings before tool reaches water surface Slide 18: SIND data_run01 Slide 19: SIND data_run03 Depth: 1.0m-6.0m (air column)
    18. 18. Air column – “zero” conductivity Possible humidity effect Water surface (Tool’s min. range reached)
    19. 19. Air column – “zero” conductivity Possible humidity effect Water surface (Tool’s min. range reached)
    20. 20. EXAMPLE 2 - Batu Dam ELOG’s short resistivity vs. SIND’s derived resistivity in open water bodies Slide 21: SIND Data Slide 22: ELOG Data Depth: 18m-23m
    21. 21. 86Ohm.m ~11.9mS/m (119µS/cm) (Value couldn’t hit beyond 100Ohmm due to to tool’s max. range reached unlike ELOG)
    22. 22. 257Ohm.m Conductivity=10^4/Ohmm = 10000/257 = 38.9 ~ 39µS/cm See slide#15 under ELOG
    23. 23. EXAMPLE 3- KLT017 (alluvium) ELOG’s short resistivity vs. SIND’s derived resistivity in Alluvium Slide 24: SIND Data Slide 25: ELOG Data Depth: 61m-67m
    24. 24. SIND’s; 15.46Ohmm
    25. 25. ELOG’s; 23.55Ohmm
    26. 26. EXAMPLE 4 - SK198 (hard-rock) ELOG’s short resistivity vs. SIND’s derived resistivity in hard rock. Slide 27: SIND Data Slide 28: ELOG Data Depth: 76m-82m
    27. 27. 2.11 Ohmm
    28. 28. 12.93 Ohmm
    29. 29. Conclusion 1. A consistent shift in resistivity values are observed from that of SIND & ELOG tools in alluvial and hardrock environment. 2. Recommended resistivity operating range for SIND’s tool is between 0 – 100 Ohmm. Readings are unreliable beyond the recommended range as shown in Batu Dam evaluation exercise.
    30. 30. Acknowledgements 1. DID, Northern Zone Div., Federal Territory – Tuan Hj Zul Mohamad, Mohd Ezla, Izrul Faris, Bachtiar Effendi & Mohd Shariff 2. DID, Water Resources Management and Hydrology dept., Ampang – Yuhaslin, Khairul Fadzilah

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