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51315-5525-Effect of Intervention History on Corrosion State of Production Tubulars

Picture for Effect of Intervention History on Corrosion State of Production Tubulars
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Product Number: 51315-5525-SG
ISBN: 5525 2015 CP
Author: Lisbeth Hilbert
Publication Date: 2015
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Jan LarsenMærsk Olie og Gas A/S50 EsplanadenDK-1263 Copenhagen KDenmarkLisbeth Rischel HilbertFORCE Technology345 Park AlléDK-2605 BrøndbyDenmarkPernille J. RaahaugeMærsk Olie og Gas A/S50 EsplanadenDK-1263 Copenhagen KDenmarkABSTRACTLess than a year after recompletion a producing well was shut in due to penetrating wall thickness loss in the L-80 top completion. The short service life included a history of numerous coil tubing jobs several shut-in periods and only limited production periods. The cause of a longitudinal local wall thickness loss of approximately 7 mm in 10 months might be a highly corrosive media combined with a mechanism for localization. Another suggestion was the possible occurrence of mechanical wear relating to the numerous coil tubing operations.The examined materials comply with standard quality of L80 and L80-13Cr. No indications of wear in the form of deformations were detected on the examined tubulars - however subsequent corrosion attacks may have removed these. On the basis of the geometries of the longitudinal track and the coil respectively the coil itself cannot have induced the observed penetrating longitudinal tracks by metal-metal contact. The penetrating holes were caused by longitudinally orientated localized corrosion which had initiated and propagated from the inside surface of the tubular. The L80-13Cr pup joints were also corroded indicating a possible effect of oxygenated seawater. The produced media was close to seawater composition and with ~0.2 mole % CO2 and ~400 ppm H2S in the gas phase.A possible explanation for the failure mode is that the numerous coil tubing operations caused local mechanical damage to protective scale and iron sulfides exposing the bare metal in a track thereby facilitating localization of corrosion. The controlling degradation mechanism is corrosion due to aggressive fluids including untreated oxygen-containing seawater used during the interventions. It is essential that the prescribed treatment of seawater with corrosion inhibitor oxygen scavenger and biocide is followed in all cases and during all interventions.Keywords: Intervention well production tubular scale corrosion untreated seawater coil tubing operation.
Jan LarsenMærsk Olie og Gas A/S50 EsplanadenDK-1263 Copenhagen KDenmarkLisbeth Rischel HilbertFORCE Technology345 Park AlléDK-2605 BrøndbyDenmarkPernille J. RaahaugeMærsk Olie og Gas A/S50 EsplanadenDK-1263 Copenhagen KDenmarkABSTRACTLess than a year after recompletion a producing well was shut in due to penetrating wall thickness loss in the L-80 top completion. The short service life included a history of numerous coil tubing jobs several shut-in periods and only limited production periods. The cause of a longitudinal local wall thickness loss of approximately 7 mm in 10 months might be a highly corrosive media combined with a mechanism for localization. Another suggestion was the possible occurrence of mechanical wear relating to the numerous coil tubing operations.The examined materials comply with standard quality of L80 and L80-13Cr. No indications of wear in the form of deformations were detected on the examined tubulars - however subsequent corrosion attacks may have removed these. On the basis of the geometries of the longitudinal track and the coil respectively the coil itself cannot have induced the observed penetrating longitudinal tracks by metal-metal contact. The penetrating holes were caused by longitudinally orientated localized corrosion which had initiated and propagated from the inside surface of the tubular. The L80-13Cr pup joints were also corroded indicating a possible effect of oxygenated seawater. The produced media was close to seawater composition and with ~0.2 mole % CO2 and ~400 ppm H2S in the gas phase.A possible explanation for the failure mode is that the numerous coil tubing operations caused local mechanical damage to protective scale and iron sulfides exposing the bare metal in a track thereby facilitating localization of corrosion. The controlling degradation mechanism is corrosion due to aggressive fluids including untreated oxygen-containing seawater used during the interventions. It is essential that the prescribed treatment of seawater with corrosion inhibitor oxygen scavenger and biocide is followed in all cases and during all interventions.Keywords: Intervention well production tubular scale corrosion untreated seawater coil tubing operation.
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