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00104 Solving Iron Sulfide Problems in an Offshore Gas Gathering System

Picture for 00104 Solving Iron Sulfide Problems in an Offshore
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Product Number: 51300-00104-SG
ISBN: 00104 2000 CP
Author: J.Kirk Brownlee, J.A. Dougherty, Tauseef Saima, Rudolf H. Hausler
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This paper describes problems and experiences incurred with the use of re-circulated corrosion inhibitor oil (CIO) to protect an offshore sour gas-condensate production and gathering system. Over time, changes in the carrier oil chemical composition, co-mingling of produced fluids from three different fields, and increases in formation water production have resulted in contamination of the carrier oil with solids. Measurements show that the solids are predominantly iron sulfides (-65 percent). The iron sulfides have helped to stabilize the oil/water emulsions as well as increase chemical treatment and other operating costs. Iron sulfide deposits in particular may also have promoted under-deposit corrosion in the CIO/water pipelines and in CIO storage and separation tanks. The problems accompanying solids buildup in the CIO system have been largely solved by applying appropriate demulsifiers to the CIO to facilitate separation of produced water and removal of iron sulfide. Enhanced separation of iron sulfides from the oil was obtained when an additional settling tank was added to the system, which provided additional time for solids fallout. System background information and operational characteristics are presented followed by a discussion of results from field and laboratory tests of demulsifying chemicals. The importance of iron sulfide in promoting under deposit corrosion of bare carbon steel is also discussed. Key Words: Iron sulfide, demulsifier, corrosion inhibitor, under-deposit corrosion, sour gas, gas wells
This paper describes problems and experiences incurred with the use of re-circulated corrosion inhibitor oil (CIO) to protect an offshore sour gas-condensate production and gathering system. Over time, changes in the carrier oil chemical composition, co-mingling of produced fluids from three different fields, and increases in formation water production have resulted in contamination of the carrier oil with solids. Measurements show that the solids are predominantly iron sulfides (-65 percent). The iron sulfides have helped to stabilize the oil/water emulsions as well as increase chemical treatment and other operating costs. Iron sulfide deposits in particular may also have promoted under-deposit corrosion in the CIO/water pipelines and in CIO storage and separation tanks. The problems accompanying solids buildup in the CIO system have been largely solved by applying appropriate demulsifiers to the CIO to facilitate separation of produced water and removal of iron sulfide. Enhanced separation of iron sulfides from the oil was obtained when an additional settling tank was added to the system, which provided additional time for solids fallout. System background information and operational characteristics are presented followed by a discussion of results from field and laboratory tests of demulsifying chemicals. The importance of iron sulfide in promoting under deposit corrosion of bare carbon steel is also discussed. Key Words: Iron sulfide, demulsifier, corrosion inhibitor, under-deposit corrosion, sour gas, gas wells
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