Flow Model

Mon, 01 Jan 0001 00:00:00 +0000

Fundamentals of Flow Modeling

Understanding flow characterization is essential for predicting and assessing the corrosivity of systems. Over time, significant progress has been made in studying the relationship between flow dynamics and corrosion. To support these efforts, various flow models have been developed, each tailored to specific conditions. Among them, the single-phase flow model stands out for its simplicity and well-defined structure, making it a fundamental tool in flow characterization studies.

pH Model

Mon, 01 Jan 0001 00:00:00 +0000

Background

Understanding in-situ pH is essential for assessing and managing corrosion in oil and gas systems. In simple CO₂-H₂O systems, pH is mainly controlled by CO₂ partial pressure.¹ ^- ³ A general relationship between pCO₂ and pH (at constant temperature) is presented in Figure 1.

Figure 1: Generic representation of pCO₂-pH relation. ^after ¹

As the corrosion reaction between iron and carbonate ions progresses, the pH of the fluid increases along with the concentrations of Fe²⁺ and CO₃²⁻ ions. When their solubility limit is exceeded, iron carbonate (FeCO₃) begins to precipitate, forming a protective layer on the steel surface, which can eventually reduce the corrosion reaction rate to some extent. The corrosion protection effectiveness of this layer depends on several factors, with pH, temperature, and ion concentrations being the most prominent.

General on Knowledge Library

Flow Model

Fundamentals of Flow Modeling

pH Model

Background