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02342 APPLICATION OF HYDROGEN PERMEATION FOR MONITORING SULFIDE STRESS CRACKING SUSCEPTIBILITY

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Product Number: 51300-02342-SG
ISBN: 02342 2002 CP
Author: Concepción Méndez, Isabel Martínez, Luis Melián, José Vera
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A methodology was developed, which shows the possibility of using non-intrusive hydrogen permeation monitoring on a pipeline, as an online sensor for predicting the effect of changing fluid conditions (i.e, pH, H 2 S concentration, water cut, inhibitors) on the Sulfide Stress Cracking Susceptibility of a high strength carbon steel production tubing. A correlation between thickness-normalized hydrogen flux through an API P110 and 5LB grades of steel was achieved, which was valid throughout several orders of magnitude in hydrogen flux, obtained under different experimental conditions (e.g., hydrogen charging conditions, temperature, wall thickness) Keywords: Hydrogen permeation, corrosion monitoring, sulfide stress cracking. INTRODUCTION Resistance to Sulfide Stress Cracking (SSC) is often the principal factor affecting the choice of materials for H 2 S-containing environments, since the occurrence of SSC can result in a catastrophic and potentially hazardous failure. It is well known that materials susceptibility to sulfide stress cracking is a complex function of several parameters integrating effects of materials properties, mechanical solicitations, and environmental conditions (e.g., temperature, H 2 S partial pressure, solution chemistry). The effect of some of these parameters are included in recommended practices 1,2 , and used along with laboratory testing in selecting the best material for specific applications.
A methodology was developed, which shows the possibility of using non-intrusive hydrogen permeation monitoring on a pipeline, as an online sensor for predicting the effect of changing fluid conditions (i.e, pH, H 2 S concentration, water cut, inhibitors) on the Sulfide Stress Cracking Susceptibility of a high strength carbon steel production tubing. A correlation between thickness-normalized hydrogen flux through an API P110 and 5LB grades of steel was achieved, which was valid throughout several orders of magnitude in hydrogen flux, obtained under different experimental conditions (e.g., hydrogen charging conditions, temperature, wall thickness) Keywords: Hydrogen permeation, corrosion monitoring, sulfide stress cracking. INTRODUCTION Resistance to Sulfide Stress Cracking (SSC) is often the principal factor affecting the choice of materials for H 2 S-containing environments, since the occurrence of SSC can result in a catastrophic and potentially hazardous failure. It is well known that materials susceptibility to sulfide stress cracking is a complex function of several parameters integrating effects of materials properties, mechanical solicitations, and environmental conditions (e.g., temperature, H 2 S partial pressure, solution chemistry). The effect of some of these parameters are included in recommended practices 1,2 , and used along with laboratory testing in selecting the best material for specific applications.
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A model was built that describes stress field and hydrogen activity at the direct vicinity of a crack tip. A second model was based on the cohesive zone simulates the kinetic of a crack growth. Experiments using hydrogen permeation under stress on flat un-notched & notched specimens yielded data comparable to the simulations.
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