Sami Abulnoun Ajeel; Mohammed Abdullatef Ahmed
Abstract
Steel corrosion and erosion-corrosion have an important role in oil fieldsutilizing steel pipelines. Therefore; in the present work corrosion, erosion anderosion-corrosion tests are ...
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Steel corrosion and erosion-corrosion have an important role in oil fieldsutilizing steel pipelines. Therefore; in the present work corrosion, erosion anderosion-corrosion tests are studied individually to investigate the interactionbetween corrosion and erosion processes and to quantify the synergy (that causedby erosion) in realistic flow environments.The experimental work tests were done using special device which wasdesigned and manufactured according to (G 73) ASTM with certain modifications.The experimental work tests were achieved using traditional weight losstechnique to measure weight loss rates in (gmd) unit. Also the microstructureobservations of the test specimens are studied.It was observed that whole tests were conducted on oil pipe (X 60) made oflow carbon steel in plate form, tests were made on corrosion using 3.5 wt %sodium chloride. (NaCl) solution as sea water purged with CO2 gas as the corrosivemedium in crude oil, erosion using 1 wt % silica sand as the erodent in distilledwater purged with N2 gas as anti corrosive medium to get erosion just duringerosion and erosion-corrosion using the same mentioned medium in the corrosionbut in erosion-corrosion 1 wt % silica sand was added as slurry to that medium, alltests above were done under pumped media except in case of corrosion andpumped media had constant pressure of 1 bar, flow rate Q = 36 L/min, temperature≈ 25 ºC and pH = 4.4 for corrosive and erosive-corrosive media but pH = 7.4 forerosive medium.After traditional weight loss technique was achieved, it was found thatcorrosion rate C.R (0.18144 gmd) was the smallest, erosion rate E.R (0.80214gmd)was greater than corrosion rate (C.R), but erosion-corrosion rate EC.R(3.99161gmd) was the biggest ie. (EC.R was greatest), in addition synergy(0.0315g) was calculated by using special equation related to weight loss whichwas measured in (g) unit.
