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Understanding The Effects of Test Solution Chemistry on Sour Service Testing at a pH Range Relevant to Flexible Pipe in Oil and Gas Applications

Picture for Understanding The Effects of Test Solution Chemistry on Sour Service Testing at a pH Range Relevant to Flexible Pipe in Oil and Gas Applications
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Fossil fuel is still the main source of energy, despite ongoing attempts to replace it with renewable sources. Nowadays, the easily accessible fossil energy is depleting significantly onshore; and since the need for this source of energy remains, the extraction of oil and gas from subsea is increasing. Unbounded flexible pipes are largely employed for extracting oil and gas from subsea fields as well as for CO2 reinjection into the oil wells to enhance their efficiency.

Product Number: 51323-19055-SG
Author: R. Yazdi, M. Haahr, J. B. Jakobsen, L. Korcakova, S. Sondergaard, J. Gudme
Publication Date: 2023
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$20.00
$20.00

This study investigates several NACE TM0177 test solutions adjusted to the pH relevant to flexible pipe applications. Due to the low ratio of solution-to-steel surface area for the annulus, the environment readily supersaturates with Fe2+, and the pH is consequently in the range of 5.0-6.5. This makes the choice of test solution not straightforward.


Six types of carbon steel wires with known different mechanical properties and H2S resistance were exposed to pH-adjusted NACE TM0177 Solutions B, C, and D adjusted to the pH level of 5.1–5.4 under the purging condition of 1.0% and 1.5% H2S in CO2 at ambient pressure for 720 hrs. The sour resistance results from the different solutions were evaluated and compared with results obtained in an unbuffered solution (5.0 wt% NaCl solution). The results discussed in this paper showed that the test solutions with different buffer capacities have a limited impact on the sour test result in conditions relevant to flexible pipe annulus and that results obtained in any of the solutions should be considered equally valid.

This study investigates several NACE TM0177 test solutions adjusted to the pH relevant to flexible pipe applications. Due to the low ratio of solution-to-steel surface area for the annulus, the environment readily supersaturates with Fe2+, and the pH is consequently in the range of 5.0-6.5. This makes the choice of test solution not straightforward.


Six types of carbon steel wires with known different mechanical properties and H2S resistance were exposed to pH-adjusted NACE TM0177 Solutions B, C, and D adjusted to the pH level of 5.1–5.4 under the purging condition of 1.0% and 1.5% H2S in CO2 at ambient pressure for 720 hrs. The sour resistance results from the different solutions were evaluated and compared with results obtained in an unbuffered solution (5.0 wt% NaCl solution). The results discussed in this paper showed that the test solutions with different buffer capacities have a limited impact on the sour test result in conditions relevant to flexible pipe annulus and that results obtained in any of the solutions should be considered equally valid.

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