Coiled tubing

Study of Field Failures Decodes Hydrogen Embrittlement in High-Strength Coiled Tubing

This study emphasizes the vital need to evaluate well conditions and working-fluid compatibility with coiled tubing materials to prolong coiled tubing operational life.

High-pressure sour exposure chamber.
Fig. 1—High-pressure sour exposure chamber.
Source: SPE 218327.

Recent reports have highlighted hydrogen embrittlement of high-strength, quench-and-temper (Q&T) coiled tubing (CT) resulting from hydrochloric (HCl) acid usage in sour environments. HCl acid treatments expose CT surfaces to aggressive corrosion, often exacerbated by hydrogen sulfide (H2S) from formation fluids or as a chemical reaction. Helping the CT industry recognize the morphologies of damage when the tube is retired and re-evaluating CT grade selection and chemicals are vital for averting costly and dangerous CT failures. To achieve this goal, a summary of field failures was evaluated from diverse operational environments and locations.

Hydrogen Embrittlement: Failure Case Studies and Modes

CT field failures can have catastrophic effects on the environment and in the field.

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