Abstract
Abstract Laboratory sulfide stress cracking (SSC) tests were performed on specimens taken from QT-900 and QT-1000 coiled tubing (CT) test strings in an attempt to define zones of acceptable sour service. Acceptable pH-PH2S zones of service for QT-900 CT were proposed in SPE 93786.1 This paper presents additional QT-900 CT test data to further refine acceptable zones of service, with and without use of a chemical inhibitor. In addition, SSC testing was undertaken on QT-1000 CT. The SSC tests on QT-1000 CT were performed in manner similar to that conducted on QT-900 CT, using acidified aqueous solutions with H2S partial pressures ranging from 0.00345 to 100 bars and pH from 3.5 to 6.5, with and without inhibitor. Both as-milled and pressure-cycled tubing was tested. Test specimens were taken from parent metal and bias weld locations. The test data was used to construct acceptable zones of service on a pH-PH2S diagram.
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