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  • 11 Managed pressure drilling scaled
    Published On: April 29, 2025

    The Critical Role of Proper Site Investigation in Tunnel Projects

    Good site investigation is fundamental to any works in the ground, and the more complex the geology, the more intensive [...]

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Sigra is a privately owned company founded in 1994. It is based in Brisbane, Australia, and operates globally. Sigra is involved in all matters to do with the ground.

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    Sigra provides the experienced field personnel with the capability to conduct the standard exploration drilling supervision and analysis in conjunction with the geotechnical aspects essential to mine design and specific mining related problems.

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    • Rock Properties Testing
      • Uniaxial Testing
      • Shear Testing
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      • Hydrostatic Testing
      • Index Testing
      • Geophysical Comparisons
      • Other Tests
    • Stress Measurement in Rock
      • In-Situ Stress Testing By Overcoring – 2D
      • In-Situ Stress Testing By Overcoring – 3D
      • Hydrofracture
      • Hydrojacking
      • Core Ovality
      • Borehole Breakout
      • Surface Stress Measurement
      • Stress Change Monitoring
      • Tectonic Strain
    Coal & Shales
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      • Carbonate Content – Matrix & Fracture
      • Coal Shrinkage with Desorption
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      • Pulsed DST Testing
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      • Permeability Testing from Underground
      • Core Permeability
    • Pressure Measurement
      • Piezometers
    • Stress-Related Permeability
    Gassy Rocks – Coals and Shales
    • Gas Content Measurement
      • Gas Content From Core Desorption
      • Gas Content Without Coring
      • Gas Content From Cuttings
    • Gas Sorption Isotherms – Gas Storage
      • Isotherms by Regassing
      • Native Sorption Isotherms
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      • Diffusion from Cuttings
      • Apparent Diffusion Coefficient from Core
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