51314-3903-Evaluation of Heavy-Walled High-Strength Low-Alloy Steel Mechanical Tubing for Stress Corrosion Cracking Resistance

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Product Number: 51314-3903-SG

ISBN: 3903 2014 CP

Author: Karthik Krishnan

Publication Date: 2014

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There is an increasing need for high-strength low-alloy steel grades for various downhole completion and well-test tools to meet design requirements in high-pressure and high-temperature (HPHT) wells. With the possibility of using these tools in well environments also containing Hydrogen Sulfide (H2S) gas both for short-term and long-term exposure they also must have adequate sulfide stress-cracking (SSC) resistance for the intended service. However due to their machined complexity and required mechanical performance many completion and test-tool components require heavy-wall raw material such as mechanical tubing and hollow bar. Heat treating these materials for HPHT service poses challenges with regards to hardenability and its possible effect on SSC resistance.Various heats of heavy-walled high-strength low-alloy steel were evaluated for their SSC resistance at elevated temperatures using NACE TM0177 Method A. These materials also were evaluated at room temperature to determine their KISSC using NACE TM0177 Method D. The results of this study will be presented and discussed.Keywords: heavy wall; high strength low alloy steel; hydrogen sulfide (H2S); sulfide stress cracking (SSC)