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H2Oil Well Testing Suite is a comprehensive engineering calculator app designed for well test supervisors, field engineers, and operations teams working in oil and gas. Every calculation runs entirely on your device - no internet connection, no cloud, no subscriptions. Your data never leaves your phone. CALCULATORS INCLUDED Well Testing - AGA-3 Orifice Gas Metering (Reader-Harris/Gallagher, ISO 5167-2 / API MPMS 14.3.1) - Dual Choke Sizing (Thornhill-Craver / Economides, critical and subcritical) - Choke Flow Rates (gas, oil, multiphase) - Separator Retention Time (two and three-phase) - Bottoms Up Time / kill sheet calculations - Solution GOR (Standing 1947) - Oil and Gas Rate (surface and reservoir) - MCF and Shrinkage Flow Assurance - Well Test Simulator: full flow path from Wellhead to SSV, Choke, Heater, Separator, Flare, Surge Tank and Atmospheric Tank. Live pressure, temperature and velocity at every node. API RP 14E erosional velocity and hydrate risk at each segment. Flare and Radiation - API 521 Flare Radiation Analysis - Interactive 3D Flare Model with touch pan and pinch-to-zoom - Radiation exclusion zones mapped to API 521 Table 5 thresholds - 2D Radiation Contour Map Reservoir Engineering - Decline Curve Analysis: Arps, Duong, Stretched Exponential with P10/P50/P90 EUR Safety - PRV Sizing (API 520 Part I) REPORTING Every calculator exports a professional PDF report including your company logo, client logo, well and field details, engineer name, and full results. Reports save directly to the Files app via the iOS share sheet. PNG and CSV exports also available. DESIGNED FOR FIELD USE - Fully offline - no Wi-Fi or cell signal required on location - Dark theme optimised for outdoor readability - Large touch targets and haptic feedback - All data stored locally with iCloud-eligible backup WHO IS IT FOR Well test supervisors, petroleum engineers, production engineers, drilling engineers, HSE engineers, and operations personnel who need fast, reliable engineering calculations on location without a laptop. Developed by H2Oil Engineering - well testing and engineering services. Contact: software@h2oil.co.uk