Proppant Evaluation


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A World Leader in Analysis
of Proppant for Hydraulic Fracturing and Gravel-Pack Operations

Stim-Lab has a wealth of experience evaluating the physical properties of proppant delivered to the well site, including on-going conductivity research through the Consortium.


The long-term conductivity of a proppant is determined between either standard lab core (Ohio Sandstone and Bandera Shale) or customer submitted formation core samples in patented multi-cell stacks. Tests are run with and without fluids present at a specified temperature (up to 300°F), closure pressure (up to 16,000 psi), and time.

Tests Include:

  • Long-Term Conductivity Between Core per API RP 19D
  • Regain Conductivity of Fracturing Fluids
    (Fracture treatment simulations are run between core with a specified fracturing fluid and proppant, followed by clean-up with brine, oil or gas.)
  • Single Stress Point Conductivity

Physical Characteristics of Proppant

Stim-Lab performs testing under the API Standard 19C to evaluate proppant characteristics under specified testing conditions in the laboratory.

Tests Include:

  • Sieve analysis – grain size distribution
  • Sphericity and roundness (Krumbein shape factor)
  • Acid Solubility-indicates the presence of “impurities”
  • Turbidity (silt and fine particulate)
  • Crush resistance for 10% K value
  • Apparent density
  • Bulk density-the mass of material that fills a volume, includes both proppant and porosity
  • Loss of Ignition
  • Crush Resistance – stress specific