Subsurface Library

Full access to the CrowdField workflows library. Tools, scripts, and applications with ongoing updates and new releases.

Fit decline curves to production data and generate forecasts using Arps equations in Excel.

Estimate in-place volumes using Monte Carlo simulation with transparent inputs and outputs directly in Excel.

Calculate oil, gas, and water PVT properties using industry-standard correlations directly in Excel.

Analyse RFT/MDT pressure data to estimate gradients, fit trends, and identify free fluid levels in Excel.

Calculate critical lift rate (Qcr) in gas wells using Turner and Coleman correlations in Excel.

Perform gas material balance using P/Z analysis to estimate OGIP, EUR, and recovery factors in Excel.

Performs rate transient analysis using Blasingame type curve matching to estimate reservoir and well parameters

Estimates OGIP from flowing pressure and rate data under boundary-dominated flow conditions.

Calculate pressure gradients (dP/dz) from fluid properties at reservoir conditions.

Estimates original oil in place from rate-normalized flowing pressure data using pseudo-steady state flow and depletion relationships.

Generate region-specific PVT properties from Malaysian oil datasets using empirical correlations.

Generate and adjust relative permeability curves and export simulation-ready tables directly from Excel.

Design and implement Excel-based applications using VBA forms and custom interfaces.

Reference log–log derivative signatures for pressure transient analysis and interpretation.

Compute and visualize radial pressure profiles for infinite-acting reservoirs using the diffusivity equation solution.

Think oil is just fuel? Think again. Discover how many everyday items around you come from oil & gas.

Explore the knock-on effects of a $50/bbl oil world and test your knowledge and intuition.

An interactive Q&A game based on Dan O’Meara’s Saturation Confusion series, designed to test your intuition on saturation modelling, permeability, and J-functions.

Step inside the Fault Seal Challenge, an interactive, AI-powered training tool designed to help wellsite geologists and susbsurface pros understand how stratigraphy, fault kinematics, and diagenesis control trap integrity.

A short-form game that challenges how you reason about capillarity, pressure, and multiphase flow at the pore scale.

Estimate gas-in-place and recovery for CSG/CBM reservoirs from an interactive Langmuir isotherm chart.

Desktop application for calculating black oil, dry gas, and formation water PVT properties using multiple fluid correlations and best-fit model matching.

Calculates IPR and VLP curves, operating point, and probabilistic well performance cases from reservoir, fluid, and tubing inputs.

Compute log–log pressure and derivative responses from radial diffusivity solutions using Laplace inversion.

Compute gas well inflow performance using Darcy-based relationships between rate, pressure, permeability, and skin.

Convert between skin factor and WPIMULT using Darcy and ECL inflow relationships.

Reference log–log derivative models for pressure transient analysis based on Bourdet methodology.