Chemical Injection Rate Calculator
Calculate injection rates for corrosion inhibitors, scale inhibitors, demulsifiers, and H2S scavengers. Includes pump stroke calculator and monthly cost estimation.
Chemical Type Preset
Treatment Parameters
Typical: 25-100 ppm
Rate (gal/d) = ppm × fluid_rate × 42 / (concentration × 10,000 × SG)
Injection Rate Results
Injection Rate
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gallons per day
Rate (gal/hr)
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Rate (cc/min)
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Rate (qt/hr)
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Monthly Usage
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gallons/month
Monthly Cost
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$/month
Injection Pump Sizing
Strokes/Min Required
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Strokes/Day
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Drum Days (55 gal)
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Typical Dosage Ranges
| Chemical Type | Typical ppm | Application |
|---|---|---|
| Corrosion Inhibitor | 25-100 | Tubing, flowlines, facilities |
| Scale Inhibitor | 5-50 | CaCO3, BaSO4 prevention |
| Demulsifier | 10-100 | Oil-water separation |
| H2S Scavenger | 100-500 | Sour gas treatment |
| Paraffin Inhibitor | 50-200 | Wax deposition control |
| Biocide | 50-500 | Bacterial control (batch) |
How this was calculated
Injection Rate: Rate (gal/d) = (ppm x bbl/d x 42 gal/bbl) / (concentration/100 x 1,000,000 x SG)
ppm basis: Parts per million by volume relative to total produced fluid (oil + water).
Pump strokes: SPM = (rate in cc/min) / (displacement x efficiency/100)
Assumptions: Continuous injection. Concentration is % active ingredient by weight. Chemical density approximated by SG x 8.33 lb/gal.
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Book a free strategy call →Chemical Injection in Oilfield Production Operations
Chemical injection is a fundamental part of production operations, protecting infrastructure from corrosion, scale, paraffin, asphaltene, and H2S damage. The correct dosing rate depends on the produced fluid volume, water cut, temperature, pressure, and the specific chemistry of the produced fluids. Under-dosing leaves equipment unprotected; over-dosing wastes money and can cause emulsion problems or other issues.
The injection rate is typically expressed in parts per million (ppm) relative to the total fluid volume. Chemical injection pumps are positive-displacement diaphragm or piston pumps rated by their displacement per stroke. Setting the correct stroke rate ensures the target ppm is achieved continuously.
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