DEVELOPMENT OF CZ3-1E GAS LIQUID DOUBLE-EFFECT CORROSION INHIBITOR

On the basis of the original CZ3-1 and CZ3-3 composite corrosion inhibitors,the CZ3-1E gas liquid double effect corrosion inhibitor substitutor has been developed.The inhibitor not only has the advantages of high corrosion inhibitor efficiency and small consumption,but also overcomes such shortcomings as strange smell,inconvenient filling and high cost.Through the lab evaluation,it is shown that for the untreated CZ3-1E corrosion inhibitor,under the conditions of Moxi gas field's formation water (deoxibized),pH 2S=1.2 MPa,pCO 2=2.8 MPa,temperature =80±2℃,static behavior and test time=72 h,the gas phase corrosion rate is 0.049 5 mm/a and the corrosion inhibitor efficiency is 91.2%;the liquid phase corrosion rate is 0.064 3 mm/a and the corrosion inhibitor efficiency is 90.5%.The surface of the tested piece is smooth and there is no corroded vestige.The CZ3-1E corrosion inhibitor can meet the requirements of gas liquid two phase corrosion prevention.Through an overall comparison among the several corrosion inhibitors used in Moxi gas field,the performance of the new CZ3-1E corrosion inhibitor is good.