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Increasing the Fatigue Life of 40Cr Steel in Drilling Muds with Corrosion Inhibitors
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The fatigue life of 40Cr steel (SAE 5140) in drilling mud and inhibited mud was studied with a self-made, rotating bending corrosion fatigue testing apparatus. A significant improvement was found in the inhibited drilling fluids. As expected, 40Cr steel was susceptible to rapid failure through H embrittlement in drilling muds containing H2S, but chemical control with corrosion inhibitors resulted in a desirable improvement in corrosion fatigue life. Fractographic studies by scanning electron microscopy showed that the toughness of 40Cr was increased by the addition of corrosion inhibitors. In H2S-free drilling mud, the fatigue life increased almost 400% after adding corrosion inhibitors and an O2 scavenger. The mechanism of corrosion inhibition on pure iron and 40Cr has been studied by measuring polarization curves and hydrogen permeation rates.
Title: Increasing the Fatigue Life of 40Cr Steel in Drilling Muds with Corrosion Inhibitors
Description:
The fatigue life of 40Cr steel (SAE 5140) in drilling mud and inhibited mud was studied with a self-made, rotating bending corrosion fatigue testing apparatus.
A significant improvement was found in the inhibited drilling fluids.
As expected, 40Cr steel was susceptible to rapid failure through H embrittlement in drilling muds containing H2S, but chemical control with corrosion inhibitors resulted in a desirable improvement in corrosion fatigue life.
Fractographic studies by scanning electron microscopy showed that the toughness of 40Cr was increased by the addition of corrosion inhibitors.
In H2S-free drilling mud, the fatigue life increased almost 400% after adding corrosion inhibitors and an O2 scavenger.
The mechanism of corrosion inhibition on pure iron and 40Cr has been studied by measuring polarization curves and hydrogen permeation rates.
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