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By P. S. Jackman, L. M. Smith

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Additional resources for Advances in corrosion control and materials in oil and gas production: papers from EUROCORR '97 and EUROCORR '98

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The intrinsic stress in iron carbonate scales on steel coupons (40 x 20 x 3 mm) was also measured with a ~-goniometer by X-ray diffraction [41,42]. The intrinsic stress can be calculated from eqn (34): E £~intr - m . ~ (MPa) l+v (34) where E is the Young's modulus, v the Poisson n u m b e r and m the slope in the D{100}/sin2~ plot. It was proved by X-ray diffraction (Fig. 13) that the scales formed on the C75 grade carbon-manganese steel at 80°C in 1M NaC1 under 5 bar CO 2 consisted of siderite (FeCO3).

It is of high technical interest to evaluate the effect of inhibitors and their concentration on critical wall shear stresses, because this would permit the inhibitor concentration to be minimised for a given gas production rate or to optimise the gas Modelling the Probability of FILC in CO2 Corrosion of Steel 45 Table 3. 2 ~,. d 4 - p o i n t l o a d i n g test. e D i l a t o m e t r i c m e a s u r e m e n t , f X - r a y diffraction, g Tensile test. p r o d u c t i o n rate w i t h an a p p r o p r i a t e inhibitor concentration.

2). g. due to selective adsorption [5,6], insufficient inhibition [5,6] a n d / o r parent material inhomogeneities (initiation step I in Fig. g. due to intrinsic compressive growth stresses [2,7,8] (initiation step type 2 in Fig. 2), although initiation steps I and 2 can also be influenced by flow. All three steps have in common that they produce unprotected surface sites where deep or shallow pitting will occur. At these pits the flow is disturbed. These surface imperfections create local turbulences which prevent scale re-formation above critical flow intensities.

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