Development and application of CZ3 compound corrosion inhibitor

Oil-solubility film inhibitor CZ3-1 and water -solubility volatile inhibitor CZ3-3 are developed and are used in combination to solve the corrosion problem at Moxi gas field. Indoor atmospheric, 80# static test and high pressure, 80# static test are carried out to evaluate the corrosion control effect of CZ3-1 and CZ3-3's combined action on the corrosive media such as H₂S, CO₂, C1^- and high salinity. Caproco corrosion detection system made in Canada has been used in field test to investigate corrosion control efficiency of CZ3-1 and CZ3-3 when used in combination to the underground pipes in gas well and well head facilities. Through indoor evaluation and field detection, it is stated clearly that the compound inhibitors have good corrosion control efficiency and thus have been fully introduced in Moxi gas field.