Corrosion behavior of carbon steel in oilfield produced water under CO2/H2S coexistent system
CO2,H2S And high salinity are three common corrosion factors in oilfield produced water.When three corrosion factors coexist,the corrosion behavior is much more complex than when CO2,H2S and high salinity act alone.Using the reactor to simulate the actual operating conditions of high salinity produced water with the simultaneous presence of CO2 and H2S,the corrosion behavior of three carbon steels,20G,L245N,and L360Q,was studied under conditions of CO2 partial pressure of 0.15,0.75,1.5 MPa,H2S partial pressure of 0.000 15 MPa,and temperature of 50,60,70℃in the corrosive envi-ronment of high salinity produced water in oil fields.The results indicate that the three types of carbon steel exhibit severe corrosion in high salinity extracted water systems of oil fields where CO2/H2S coex-ists,with a maximum corrosion rate exceeding 3.4 mm/a,and corrosion is more severe in liquid phase than in gas phase.As the corrosion time prolongs,the overall corrosion rate shows a fluctuating downward trend;as the experimental temperature increases,the corrosion rate shows an overall increasing trend;un-der three different partial pressure conditions,the corrosion rate first increases and then decreases with the increase of CO2 partial pressure,and reaches its maximum at a partial pressure of 0.75 MPa;the corrosion rate order of the three materials is L245N>L360Q>20G,and the corrosion resistance order is 20G>L360Q>L245N.
CO2/H2S coexisting systemhigh salinityoilfield produced watercorrosion ratepartial pres-sure
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