pH Modelling: A Critical Tool for Corrosion Assessment in CO2/H2S Oil and Gas Systems

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Until May 2, 2025, EVERY registered user can enjoy the pH model at NO COST

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pH is one of the most critical parameters for predicting and assessing corrosivity in oil and gas production and transmission systems. Its role in corrosion and cracking is well-documented, making accurate pH determination essential for understanding system corrosivity and managing corrosion risk.

It is widely recognized that open-cup pH measurements, taken after fluid exposure to atmospheric conditions, often fail to reflect the true in-situ pH of production environments. This discrepancy can lead to significant under- or overestimation of corrosivity. Therefore, a reliable method for determining in-situ pH is essential for effective system evaluation and material selection.

To address this challenge, an in-situ pH calculation tool has been developed and released. This advanced model incorporates key environmental parameters – such as temperature, pressure, CO₂ and H₂S partial pressures, fugacity coefficients, and ionic species (including organic acids) – to deliver accurate results. Key model outputs include in-situ pH, ionic strength, balancing ion concentrations, and saturation pH, which can help in assessing the scaling potential.

User-Friendly Interface

The tool features an intuitive, web-based interface that allows engineers to input data, run simulations, and quickly interpret results for corrosion-related evaluations.

A close-up look at the pH model calculator in action

Getting Started with the pH Model

Getting started is easy. Engineers simply register on the website for instant access to the model. Within minutes, users can begin running simulations and obtaining critical in-situ pH calculations relevant to their systems.

Users can simulate a variety of operating conditions to better understand the influence of environmental factors on in-situ pH. This functionality supports more informed decision-making for corrosion risk management in CO₂ and H₂S containing systems.