Frac Sand and Proppant Size and Shape

Frac Sand and Proppant Size and Shape

The shape of the proppant is crucial as both shape and size affect the final permeability through the fracture. A wide range of particle sizes and shapes can result in a tight packing arrangement, thereby reducing permeability and conductivity. In contrast, a controlled range of sizes and a preferentially spherical shape enhance conductivity.

Historically, roundness has been analyzed using a visual and manual method based on a chart, originally developed by Krumbein and Sloss. This approach, however, often leads to subjective differences between operators.

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Chart for visual estimation of sphericity (y-axis) and roundness (x-axis)

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