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51312-01161-Evaluation of Sour Corrosion as a Function of Pressure Temperature and Tensile Strength Using Hydr

Picture for Evaluation of Sour Corrosion as a Function of Pressure Temperature and Tensile Strength Using Hydr
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Product Number: 51312-01161-SG
ISBN: 01161 2012 CP
Author: Jenny Been
Publication Date: 2012
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Tubular materials in thermal wells are simultaneously exposed to cyclic thermo-mechanical loading and sour corrosive environments leading to synergistic damage mechanisms. Current industry standards do not provide any material selection guidance when stresses result in plastic deformation. This work describes a test that uses a round tensile specimen extracted axially from the wall of tubulars with a small hole concentrically through the center creating a small mini-pipe. The mini-pipe is subjected to a range of hydrogen sulfide pressures (0.1 bar to 5 bar) temperatures (20 C to 85 C) and tensile stresses (up to 3% strain) in a high pressure high temperature autoclave. Hydrogen that forms during the corrosion reactions on the external surface of the mini-pipe diffuses through the steel and exits into the inner channel into a flow of Argon gas. Measurement of the hydrogen concentration using thermal conductivity allows for monitoring changes in corrosive conditions and sulfide scale integrity. Results are presented for L80 steel and L80 steel protected with a corrosion resistant nano-coating.
Tubular materials in thermal wells are simultaneously exposed to cyclic thermo-mechanical loading and sour corrosive environments leading to synergistic damage mechanisms. Current industry standards do not provide any material selection guidance when stresses result in plastic deformation. This work describes a test that uses a round tensile specimen extracted axially from the wall of tubulars with a small hole concentrically through the center creating a small mini-pipe. The mini-pipe is subjected to a range of hydrogen sulfide pressures (0.1 bar to 5 bar) temperatures (20 C to 85 C) and tensile stresses (up to 3% strain) in a high pressure high temperature autoclave. Hydrogen that forms during the corrosion reactions on the external surface of the mini-pipe diffuses through the steel and exits into the inner channel into a flow of Argon gas. Measurement of the hydrogen concentration using thermal conductivity allows for monitoring changes in corrosive conditions and sulfide scale integrity. Results are presented for L80 steel and L80 steel protected with a corrosion resistant nano-coating.
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