Effects of Corrosion Inhibitors and Surface Coverage on Pipeline Wall Wettability in Multiphase Systems
Figure 6: Effect of Inhibition on Contact Angle on an Iron-sulphide-coated Steel Surface
Syringe Steel surface Water droplet Figure 7: Effect of Inhibition on Contact Angle Neat brine – FeS-coated surface Brine + CI 1 – FeS-coated surface Brine + CI 2 – FeS-coated surface
20 30 40 50 60 70 80 90
10 0
Brine + CI 3 – FeS-coated surface Brine + CI 4 – FeS-coated surface Brine + CI 5 – FeS-coated surface FeS = iron sulphide.
Conclusions
For a given oil–brine system, the measurement of IFT and contact angle at flowing conditions can be useful as it enables one to understand the performance of the corrosion inhibitor. In determining how inhibitors prevent wall wettability, the corrosion tendency can be calculated.
1. Hyungchul K, Burgess D, J Solution Chem, 2002;31(2): 139–48.
2 Harkins WD, Jordan FJ, Colloid Int Sci, 1930;52:1751–3. 3. ASTM Designation: D971-99a Standard Test Method for Interfacial
Bare CS
FeS-coated CS
Low IFT values are attractive in terms of corrosion mitigation but unattractive in terms of separation and oil carryover into the brine. The presence of iron sulphate on the steel surface lowers surface wettability with water and therefore contributes to corrosion control. n
Tension of Oil against Water by the Ring Method, ASTM, 1999.
4. ASTM Designation: D2285-99 Standard Test Method for Interfacial Tension of Electrical Insulating Oils of Petroleum Origin against Water by the Drop-Weight Method, ASTM, 1999.
5.
Rotemberg Y, Boruvka L, Neumann AW, Determination of surface tension and contact angle from the shapes of axisymmetric fluid interfaces, J Colloid Interface Sci, 1983;93(1):169–83.
Enhancement
Fluoropolymer coatings offer long term corrosion protection and flow enhancement.
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Kashagan oil Uninhibited brine Brine + Cl 1 Brine + Cl 2 Brine + Cl 3 Brine + Cl 4 Brine + Cl 5
Contact angle
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