Day-shift density error of 0.605 lb/gal, against 0.302 at night

More than 72 hours of slurry injection on a fracturing rig, 21 to 23 December 2025.

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Measured density against the prediction

The Red Meter read specific gravity on the slurry entering the well. The study logged it next to the density predicted from auger inputs, with pressure and flow alongside.

The old practice predicted density from auger speed. Moisture can cake the sand, so the prediction drifts away from the line.

Results table

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Density error by shift

Recommended window for this job: 105 to 120 psi, maximum 125 psi, ramp 3 to 5 psi/h, flow stability ±0.002. A rising specific gravity with no planned sand increase pointed to material building up in the line.
Metric	Day	Night	Change
Mean pressure	108 psi	105 psi	Night ramp 2.5 to 6.3 psi/h
Mean absolute error	0.605 lb/gal	0.302 lb/gal	50% lower error at night
Flow stability, std. dev.	±0.003	±0.002	33% more stable at night

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