Produced Water & Disposal Calculators

8 specialized calculators for produced water treatment, oil-water separation, deep-well disposal, and water quality characterization — built for production and midstream engineers.

8 calculators · 8 engineering guides · API 12J · API 421 · Stokes · Stiff-Davis · Oddo-Tomson

Engineering tools spanning CPI corrugated plate separator sizing, hydrocyclone de-oiling, DAF/IGF flotation design, skim tank retention and Stokes settling, walnut shell filter backwash and loading rates, SWD well injectivity and Hall plot analysis, scale prediction via Stiff-Davis and Oddo-Tomson methods, and comprehensive produced water ion balance and quality assessment.

Primary Oil-Water Separation

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CPI / API Oil-Water Separator Sizing

Stokes / API 12J / Hazen

Corrugated plate interceptors with Stokes rising-velocity verification, Reynolds-number laminar check, and API 12J gravity retention.

CPI API 12J Stokes
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Hydrocyclone De-Oiling Sizing

Colman & Thew / Plitt

Liquid-liquid hydrocyclone d50 cut size, sharpness index, pressure drop, and pump horsepower per vendor-adapted Colman-Thew and Plitt correlations.

Hydrocyclone D50 De-Oiling
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DAF / IGF Flotation Sizing

WEF MOP-8 / API 421

Dissolved and induced gas flotation sizing with A/S ratio, saturation pressure, recycle rate, and hydraulic loading for produced water polishing.

DAF IGF API 421
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Oil-Water Skim Tank / API Separator Sizing

Stokes / Hazen / 40 CFR 435

Horizontal, vertical, and cylindrical skim tank sizing with Stokes settling, Hazen retention, and EPA 40 CFR 435 oil-and-grease discharge compliance.

Skim Tank API Separator EPA

Polishing & Disposal

Walnut Shell Filter Sizing

NACE SP0775 / API 421

Polishing-stage walnut-media filter: vessel area, bed depth, backwash rate and event volume, media inventory, and cycle-average oil-removal efficiency.

Polish Backwash

SWD Well Injection Pressure

40 CFR 144-148 UIC Class II / Hall 1963

Saltwater-disposal well surface pressure: Darcy radial inflow, hydrostatic, Haaland friction, frac-gradient safety check, and Hall-plot injectivity index.

UIC Class II Hall Plot

Water Chemistry & Quality

Scale Prediction (Stiff-Davis / Sulfate)

Stiff-Davis 1952 / Oddo-Tomson / NACE TM0374

Stiff-Davis SSI (CaCO3) plus BaSO4/CaSO4/SrSO4 saturation ratios at field T/I; charge-balance QA, BaSO4 mass projection, and tiered inhibitor recommendation.

Stiff-Davis BaSO4 / CaSO4

Ion Balance / TDS / Hardness / SAR

API RP 45 / USDA Ayers-Westcot

meq/L charge-balance closure, TDS classification (fresh/brackish/brine), CaCO3 hardness, EC, Sodium Adsorption Ratio (SAR) for irrigation reuse screening.

Charge Balance SAR / TDS