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09481 Erosion-Corrosion Wear Resistance of a Chromium Nickel Steel in a Multiphase Environment under Controlled Potentials

Picture for 09481 Erosion-Corrosion Wear Resistance of a Chromium Nickel Steel in a Multiphase Environment under
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Product Number: 51300-09481-SG
ISBN: 09481 2009 CP
Author: Hans Hoffmeister, Oliver Klein and Christian Resch
Publication Date: 2009
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Multiphase twin screw pumps are used by the oil and gas production industry to boost the transport of hydrocarbons allowing for a greater field recovery and longer transport distances. The pumps are subjected to wear due to corrosion, erosion and erosion-corrosion. This paper presents the results of an investigation focused on investigating the wear resistance of a chromium nickel steel USN S43100 (X22 CrNi 17 2) in the “as delivered” condition and after a heat treatment, under controlled corrosion activity. The materials were subjected to three different potentials in the passivity region of the materials and the resistance was investigated using different amounts of oil in a chloride ion rich standardized water phase with an addition of 10 wt.% quartz sand as erosion particles and CO2. As a result it will be shown that at all investigated potentials a water cuts of 40% and less leads to a complete inhibition and wear solely due to erosion. If the corrosion was allowed to occur, i.e. at lower cuts, the wear due to erosioncorrosion was governed mostly by the corrosion in the form of pitting corrosion. It will further be shown, that depending on the level of corrosion the use of one or the other material has its advantages.

Keywords: turbulent flow, erosion-corrosion, corrosion, inhibition, oil/water cut, multiphase pumps
Multiphase twin screw pumps are used by the oil and gas production industry to boost the transport of hydrocarbons allowing for a greater field recovery and longer transport distances. The pumps are subjected to wear due to corrosion, erosion and erosion-corrosion. This paper presents the results of an investigation focused on investigating the wear resistance of a chromium nickel steel USN S43100 (X22 CrNi 17 2) in the “as delivered” condition and after a heat treatment, under controlled corrosion activity. The materials were subjected to three different potentials in the passivity region of the materials and the resistance was investigated using different amounts of oil in a chloride ion rich standardized water phase with an addition of 10 wt.% quartz sand as erosion particles and CO2. As a result it will be shown that at all investigated potentials a water cuts of 40% and less leads to a complete inhibition and wear solely due to erosion. If the corrosion was allowed to occur, i.e. at lower cuts, the wear due to erosioncorrosion was governed mostly by the corrosion in the form of pitting corrosion. It will further be shown, that depending on the level of corrosion the use of one or the other material has its advantages.

Keywords: turbulent flow, erosion-corrosion, corrosion, inhibition, oil/water cut, multiphase pumps
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