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Innovative Logging Techniques for Taranaki

The oil and gas industry in Taranaki has seen significant evolution since the 1970s, emphasizing efficiency and cost-effectiveness. This overview highlights innovative logging techniques, including advanced density measurements and wellbore seismic surveys that improve data quality and reservoir characterization. Specific applications, such as the Mangahewa Formation, showcase minimal-cost solutions with dramatic improvements in data accuracy. Key examples include enhanced quantitative log analysis and on-site monitoring, crucial for mitigating challenges like poor hole conditions and seismic signal attenuation.

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Innovative Logging Techniques for Taranaki

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  1. Innovative Logging Techniques for Taranaki

  2. Innovative Logging Techniques for Taranaki • Industry has Evolved since 1970’s • Strong Focus on Efficiency & Cost • Rig time • Equipment reliability • data quality? • Difficult to quantify

  3. 2 examples • Dramatic improvements • Minimal cost

  4. Mangahewa Formation • Characteristics • Low porosity (10pu) • Residual hydrocarbons • Quantitative Petrophysics • requires Precision • Data Acqusition • Data Analysis • Compromised • Poor hole conditions

  5. Breakout Mechanism

  6. Primary F measurement >Density log Pad device with caliper

  7. Breakout Orientation

  8. Short-axis logging

  9. Dual Density tool configuration.

  10. Short and long-axis Density

  11. Short and long-axis Density

  12. Short and long-axis Rxo

  13. Summary • Simple & cheap solution – available to all operators • Significant advance in Data quality • Density, Rxo, NMR etc • Quantitative log analysis a Reality. • Detailed reservoir characterisation - permeability • But • Preparation important • On site monitoring essential

  14. Example 2Wellbore seismic surveys-VSP

  15. Wellbore seismic • Severe signal attenuation -only onshore -related to coupling

  16. Options • Pohokura South-01A VSP • Shoot from offshore • Vibroseis • Enlarged source pit • 5m deep, 30o slope sides, 3mx3m base • Modified “small bore” source pit

  17. “small-bore” gun pit design

  18. “Holes-R-Us” drilling the gun pit

  19. Lowering the liner into the gun pit.Steel pipe 9m x 0.91m x 1cm , 2 ton.

  20. Source amplitude & frequency onshore & offshore

  21. Source amplitude & frequency “small-bore” gun pit

  22. Geophone signal strength

  23. 3D vs. VSP Processed 3D Seismic Line Processed VSP

  24. Summary • Relatively cheap solution • Minimal Environmental impact • Improved high frequency & resolution • Improved signal strength • But • Work intensive • Onsite monitoring critical • Hole collapse

  25. Acknowledgements • Shell, Todd and OMV • Permission to publish • STOS and the Pohokura Team • Support • Schlumberger • Technical and financial help

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