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51312-01676-DAMAGE MECHANISMS IN MULTISTAGE PUMPS FOR WATER INJECTION

Picture for DAMAGE MECHANISMS IN MULTISTAGE PUMPS FOR WATER INJECTION
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Product Number: 51312-01676-SG
ISBN: 01676 2012 CP
Author: Ioana Cristina Grigorescu
Publication Date: 2012
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A detailed surface evaluation was performed for the components of two multistage centrifugal pumps for water injection in a Venezuelan oil production field. Several non-destructive methods were employed: visual inspection die penetrant and replica extraction followed by micro-morphological and chemical analysis by scanning electron microscopy (SEM) and energy dispersive X ray (EDX) spectroscopy. The flow-induced degradation mechanisms varied depending on the pump component and their ranking according to damage intensity from high to low was: i) severe erosion-corrosion in the balance bush system; ii) severe erosion-corrosion in the middle bush; iii) wear of variable intensity of the active face of wear-rings; iv) mild wear of the babbitt coated sliding bearings; v) axially oriented erosion of the contact surface between wear-ring and spindle; vi) high viscosity deposits of oil in the outlet stages; vii) spindle oxidation; viii) pitting inside impeller periphery slots; ix) deposition of crystallized salts. The criticality ranking fairly agreed with the performance history of the pumps.
A detailed surface evaluation was performed for the components of two multistage centrifugal pumps for water injection in a Venezuelan oil production field. Several non-destructive methods were employed: visual inspection die penetrant and replica extraction followed by micro-morphological and chemical analysis by scanning electron microscopy (SEM) and energy dispersive X ray (EDX) spectroscopy. The flow-induced degradation mechanisms varied depending on the pump component and their ranking according to damage intensity from high to low was: i) severe erosion-corrosion in the balance bush system; ii) severe erosion-corrosion in the middle bush; iii) wear of variable intensity of the active face of wear-rings; iv) mild wear of the babbitt coated sliding bearings; v) axially oriented erosion of the contact surface between wear-ring and spindle; vi) high viscosity deposits of oil in the outlet stages; vii) spindle oxidation; viii) pitting inside impeller periphery slots; ix) deposition of crystallized salts. The criticality ranking fairly agreed with the performance history of the pumps.
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