# ResToolbox3

> Petroleum Engineering Tools

Canonical page: [https://chrome-stats.com/d/id6759464322](https://chrome-stats.com/d/id6759464322)

## Overview

- **ID:** `id6759464322`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** MobileReservoir
- **Category:** Utilities
- **Rating:** 5.00 / 5 (2 ratings)
- **Version:** 3.0.5
- **Last updated:** 2026-04-19
- **First published:** 2026-03-11
- **Size:** 24 MB
- **Data as of:** 2026-09-21
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/restoolbox3/id6759464322)
- **Privacy policy:** [https://github.com/mwburgoyne/pyResToolbox/blob/main/ResToolbox/privacy\_policy.md](https://github.com/mwburgoyne/pyResToolbox/blob/main/ResToolbox/privacy_policy.md)

## Description

ResToolbox3 is a petroleum engineering calculator built for engineers who need answers fast - on a rig floor, in a meeting, or on a plane. PVT analysis, nodal analysis, gas hydrate prediction, production forecasting, volumetric calculations, and well testing, all from your iPhone or iPad.

FLUID PROPERTIES (PVT)
- Gas PVT: Z-factor, viscosity, compressibility, pseudo-pressure, water content, and thermal properties via 5-component Peng-Robinson EOS. Handles CO2, H2S, N2, H2, and hydrocarbon mixtures including pure and high-concentration cases
- Oil PVT: Bubble point, solution GOR, formation volume factor, viscosity, and compressibility using Valko-McCain and Velarde correlations. Three solve modes with scaling factors for GOR and viscosity
- Brine & Rock: Soreide-Whitson mutual solubility with Spivey brine correlations. Gas composition from Gas PVT flows through automatically

GAS HYDRATES
- Hydrate formation prediction via Motiee and Towler-Mokhatab correlations
- Thermodynamic inhibitor dosing for MEG, DEG, TEG, methanol, and ethanol
- Interactive P-T stability curves with inhibited and uninhibited envelopes
- Water content mass balance between reservoir and operating conditions

NODAL ANALYSIS
- Gas and oil well inflow performance (IPR) with non-Darcy flow and Vogel
- Outflow performance (VLP) via four methods: Woldesemayat-Ghajar, Hagedorn-Brown, Beggs & Brill, and Gray
- 3x3 sensitivity matrix or real-time Explorer mode with interactive sliders
- Water cut modelling with physics-based two-phase flow
- Injection well support

PRODUCTION FORECASTING
- Single-well decline profiles: hyperbolic, exponential, and harmonic
- Two-stage decline with continuous slope matching
- Multi-well field development with drilling schedule, plateau constraints, and abandonment rate

VOLUMETRICS
- Deterministic OGIP and OOIP with combined gas/oil mode
- Monte Carlo probabilistic analysis with Normal, Log-Normal, and Triangular distributions
- Exceedance probability curves with P90, P50, and P10 reporting

WELL TEST & TOOLS
- Choke flow: gas mode (Gilbert, Norsok, TAM, SLB) and oil mode (Gilbert, Ros, Baxendell, Achong)
- AGA-3 orifice metering for gas and ISO 5167 for liquid
- Gas flowline pressure drop: 30-segment Darcy-Weisbach with PR-EOS properties at each segment, plus Weymouth and Panhandle B empirical methods
- Petrophysics: Archie equation with density, sonic, and direct porosity methods, Pickett plot
- Gas heating value and composition
- Pipe capacities database (tubing, casing, drill pipe)
- Unit converter with HC equivalents, reciprocal GOR/CGR, and density-gradient conversions

DESIGNED FOR THE FIELD
- iPhone-first interface with iPad responsive layouts
- Oilfield and Metric unit systems with one-tap toggle
- Share results and charts via email or messaging
- Available in English, Norwegian, French, Chinese, Spanish, and Arabic
- Works fully offline - no internet connection required
- PVT properties flow between modules automatically

All calculations use published, peer-reviewed methods from SPE literature and industry-standard references. No proprietary correlations, no curve-fitted shortcuts. Tabular data exports let you paste results directly into Excel or Google Sheets.

## Rankings

- #625,916 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6759464322)