Common antisepsis method for offshore oil casing
The corrosion problem of downhole oil casing pipe in China's offshore oil and gas fields is extremely serious, which seriously affects the service life of downhole oil casing and normal production of oil and gas fields. Through cement sealing, corrosion-resistant alloy pipes, injection of corrosion inhibitors, use of anti-corrosion coating pipes, and enhanced monitoring, the oil casing can be anticorrosive and the normal production of offshore oil and gas fields can be guaranteed. 1. Cement sealing and anticorrosion technology In the earliest period, it was analyzed that the main cause of casing damage was due to insufficient cement return, which caused the external water layer to not be completely sealed, which caused corrosive gases in the water layer to erode the casing surface and cause corrosion. Therefore, in the 1980s, a strategy of increasing the cement return height was proposed to increase the corrosion resistance of the casing. Through this technology, the degr...