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

1. Slim-Hole Induction Tool (SIND): Field Evaluation @ Batu Dam, Gombak May 11 th 2010

4. Location

8. Field Operation 60m walk-way to the intake tower 6.0m drop

9. Station

10. Set-up Depth encoder Winch Rope to secure the wheel Tool’s Cable 12V DC for winch 12V DC for micrologger

11. Equipment Conductivity Meter model WTW Multi 350i Sign as in slide #9

12. Equipment centralizer Calibration loop from RG Induction (SIND) tool Flow-meter tool

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

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. Air column – “zero” conductivity Possible humidity effect Water surface (Tool’s min. range reached)

19. Air column – “zero” conductivity Possible humidity effect Water surface (Tool’s min. range reached)

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. 86Ohm.m ~11.9mS/m (119µS/cm) (Value couldn’t hit beyond 100Ohmm due to to tool’s max. range reached unlike ELOG)

22. 257Ohm.m Conductivity=10^4/Ohmm = 10000/257 = 38.9 ~ 39µS/cm See slide#15 under ELOG

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. SIND’s; 15.46Ohmm

25. ELOG’s; 23.55Ohmm

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. 2.11 Ohmm

28. 12.93 Ohmm

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. 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