Study and Improvement of Oilfield Sewage Corrosion Test Methods

Abstract

The corrosion status and results in a certain water injection station in Shanbei oilfield were monitored and evaluated by flow corrosion test (FCT) (with homemade corrosion test device), static corrosion test (SCT), and water tank corrosion test (WTCT). The coupons after corrosion tests were observed by Scanning Electron Microscope (SEM). It was found that: the corrosion rates of SCT, FCT and WTCT were 0.0469~0.0552 mm/a, 0.5126~0.5299 mm/a, and 0.3250~0.3414 mm/a respectively; the corrosion rates SCT were much smaller than actual. The severity of pitting corrosion, pointed corrosion and other forms of local corrosion cannot be reflected by SCT. The corrosion rates and behaviors tested by homemade corrosion test device are more close and similar to the real.