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Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: O&G Well Drilling Condition: Hydrogen Microstructure: Tempered Martensite clear all

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Aspect of the fracture surface of the pin, still assembled in the box (that is externally to the pin). The pin fracture is flat, presenting radial marks.
791
VIEW
ML00088 / Dec.2017
Hydrogen Cracking of an API 5D S135 Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Aspect Before AnalysisDf - Brittle Fracture

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ML00088 — Hydrogen Cracking of an API 5D S135 Drill PipeM - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Micrographic detail of the quenched and tempered martensitic structure of the pin tool joint.
84
VIEW
ML00088 / Dec.2017
Hydrogen Cracking of an API 5D S135 Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Nital Etched Micrography by OMDf - Martensite
Macrography of the longitudinal section of the tool joint, assembled. The pin is still attached to the box end of the other drill pipe in the column, showing that the pin fractured in the region of external diameter transition (right side of the figure), where the box was probably touching the pin shoulder. Interesting to note that the inner diameter still presents a sound coating.
73
VIEW
ML00088 / Dec.2017
Hydrogen Cracking of an API 5D S135 Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Longitudinal Section AspectDf - Longitudinal Section
Visual aspect of the tool joint (TJ) that fractured in the pin body when it was assembled (the box appears as a sleeve in the pin OD). The internal coating is not damaged. The fracture is flat and presents little evidences of plastic deformation, indicating that the pin broke in a brittle way.
69
VIEW
ML00088 / Dec.2017
Hydrogen Cracking of an API 5D S135 Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Aspect by NDTDf - Brittle Fracture
Detail of the flat fracture surface of the pin, after disassembling from the TJ box. ID in the top and OD in the bottom of the figure. Radial marks are clear in the fracture surface.
57
VIEW
ML00088 / Dec.2017
Hydrogen Cracking of an API 5D S135 Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Fracture Surface AspectDf - Brittle Fracture
Fractographic analysis of the pin fracture surface showing inter and transgranular morphologies of fracture micromechanisms.
53
VIEW
ML00088 / Dec.2017
Hydrogen Cracking of an API 5D S135 Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Fractography by SEMDf - Brittle Fracture

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