Corrosion resistance of high-strength low-alloyed steels in oil-field fluids

Results of laboratory and oil-field tests of low-alloyed 20X{Gamma}2PKaba and 32{Gamma}2 steels of the L strength group at oil-producing and injection wells of the Neft Dashlary Oil and Gas Production Board are presented. An increased corrosion-cracking resistance of 20X{Gamma}2PKaba steel in oil-field fluids is pointed out. The tests show that cathodic oxygen depolarization on the 20X{Gamma}2PKaba steel under stress-corrosion conditions in both striatal and sea water is inhibited as compared with the results from the 32{Gamma}2 steels and 45 steels. Both the new low-alloyed steel and 32{Gamma}2 steel, having been submitted to thermomechanical treatment, possess increased resistance against general and pitting corrosion as well as corrosion-cracking resistance in sea water and hydrogen-sulfide containing striatal water.