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98100 EXPERIENCES IN PRODUCTION AND CORROSION MONITORING FOR A GAS CONDENSATE FIELD CONTAINING CO2

Picture for 98100 EXPERIENCES IN PRODUCTION AND CORROSION
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Product Number: 51300-98100-SG
ISBN: 98100 1998 CP
Author: Markus Oberndorfer, Karin Dornstauder, Walter Brunner
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The field Hoflein is located 10 km NW of Vienna. Gas condensate is produced out of 9 wells at the dew point of 28.1 MPa and 78°C. The reservoir fluid is lean but contains more than 16% CO2. Lab test preceded the selection of the inhibitor for the carbon steel. Critical parts of the installations had 13% Cr steel. This paper describes the inhibitor testing procedures and the monitoring of the corrosion process by OMV Austria. The produced reservoir fluids and the critical components in the water (Cl, Fe, pH, inhibitor concentration) have been recorded over the years in various locations. Fluid analysis, corrosion coupon data visual inspection and caliper measurements of field installation document a high degree of protection. Recently the reservoir underwent a reevaluation in which the reserves could be doubled. This gave the incentive to produce at higher rates (from 8 to probably 16 m/s). Inhibitors of the 3rd generation that work even under high velocities were applied. For this case a test loop in the laboratory is described which allows for emulating the high velocity flow conditions that are planned in the field and where the inhibitors can be tested and selected. Keywords: carbon dioxide, gas condensate, inhibition, high velocity, corrosion monitoring
The field Hoflein is located 10 km NW of Vienna. Gas condensate is produced out of 9 wells at the dew point of 28.1 MPa and 78°C. The reservoir fluid is lean but contains more than 16% CO2. Lab test preceded the selection of the inhibitor for the carbon steel. Critical parts of the installations had 13% Cr steel. This paper describes the inhibitor testing procedures and the monitoring of the corrosion process by OMV Austria. The produced reservoir fluids and the critical components in the water (Cl, Fe, pH, inhibitor concentration) have been recorded over the years in various locations. Fluid analysis, corrosion coupon data visual inspection and caliper measurements of field installation document a high degree of protection. Recently the reservoir underwent a reevaluation in which the reserves could be doubled. This gave the incentive to produce at higher rates (from 8 to probably 16 m/s). Inhibitors of the 3rd generation that work even under high velocities were applied. For this case a test loop in the laboratory is described which allows for emulating the high velocity flow conditions that are planned in the field and where the inhibitors can be tested and selected. Keywords: carbon dioxide, gas condensate, inhibition, high velocity, corrosion monitoring
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