The Role of Phosphate-Conversion Coatings in the Makeup and Sealing Ability of Casing Connections
- Dennis Ernens (Shell Global Solutions International BV and University of Twente) | Egbert J. van Riet (Shell Global Solutions International) | Matthias B. de Rooij (University of Twente) | Henry R. Pasaribu (Shell Global Solutions International) | Willem M. van Haaften (Shell Global Solutions International) | Dirk J. Schipper (University of Twente)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 2019
- Document Type
- Journal Paper
- 60 - 70
- 2019.Society of Petroleum Engineers
- pipe dope, phosphate conversion coating, surface texture, metal-to-metal sealing, premium connections
- 3 in the last 30 days
- 102 since 2007
- Show more detail
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Phosphate-conversion coatings are widely used on (premium) casing connections for protection against corrosion. These coatings provide galling protection in conjunction with lubricant. The friction and wear that occur during makeup and subsequent load cycling strongly influence the sealing performance of the metal/metal seal. Therefore, phosphate-conversion coatings play an important role in the sealing performance of metal/metal seals. An extensive test program was set up to investigate the role of phosphate coatings during makeup and in the subsequent sealing of the metal/metal seal. With pin-on-disk, anvil-on-strip, and ring-on-ring tests, the interactions between the substrate, lubricant, and phosphate coating were investigated. A comparison was made between uncoated and coated specimens using base greases and formulated greases: API-modified lubricant and two commercially available yellow dopes. The results indicate a strong influence of the phosphate coating leading to damage-free makeup, low wear, and less dependence on the lubricant for optimal sealing ability. This is attributed to the formation of a hard and smooth dissimilar surface, the ability to adsorb the lubricant, and the generation of a transfer layer on the uncoated countersurface. It is concluded that taking the interaction with phosphates into account could enable lubricants to be tailored for sealing performance, and thus can ease the transition to environmentally friendly rated lubricants.
|File Size||1 MB||Number of Pages||11|
API RP 5A3, R2015, Recommended Practice on Thread Compounds for Casing, Tubing, Line Pipe, and Drill Stem Elements. 2015. Washington, DC: API.
Burke, D. 2005. The Sliding Friction of Bonded Solid Lubricants. PhD dissertation, University of Central Lancashire, Preston, England.
Carper, H. J., Ertas, A., and Cuvalci, O. 1995. Rating Thread Compounds for Galling Resistance. J. Tribol. 117 (4): 639–645. https://doi.org/10.1115/1.2831529.
Carper, H. J., Ertas, A., Issa, J. et al. 1992. Effect of Some Material, Manufacturing, and Operating Variables on the Friction Coefficient in OCTG Connections. J. Tribol. 11 (4): 698–705. https://doi.org/10.1115/1.2920938.
Czichos, H. and Winer, W. O. 1978. Tribology: A Systems Approach to the Science and Technology of Friction, Lubrication and Wear (Tribology Series, 1). J. Lubrication Tech. 100 (4): 513–514. https://doi.org/10.1115/1.3453269.
Ernens, D., de Rooij, M. B., Pasaribu, H. R. et al. 2018. Mechanical Characterization and Single Asperity Scratch Behaviour of Dry Zinc and Manganese Phosphate Coatings. Tribol. Int. 118 (February): 474–483. https://doi.org/10.1016/j.triboint.2017.04.034.
Ertas, A. 1992. Experimental Investigation of Galling Resistance in OCTG Connections. J. Eng. Ind. 114 (1): 100–104. https://doi.org/10.1115/1.2899745.
Ertas, A., Cuvalci, O., and Carper, H. J. Jr. 1999. Determination of Friction Characteristics of J-55 OCTG Connections Lubricated With Environmentally Safe Thread Compound. Tribol. Trans. 42 (4): 881–887. https://doi.org/10.1080/10402009908982296.
Gardobond and Gardoclean are registered trademarks of Chemetall GmbH, Frankfurt am Main, Germany.
Hertz, H. 1882. Ueber die Berührung Fester Elastischer Körper. Crelle J. 92 (1882):156–171. https://doi.org/10.1515/crll.1882.92.156.
Inose, K., Sugino, M., and Goto, K. 2016. Influence of Grease on High-Pressure Gas Tightness by Metal-to-Metal Seals of Premium Threaded Connections. Tribol. Online 11 (2): 227–234. https://doi.org/10.2474/trol.11.227.
ISO/FDIS 13679, Petroleum and Natural Gas Industries—Procedures for Testing Casing and Tubing Connections. 2011. Geneva, Switzerland: ISO.
Johnsen, S., Frost, T. K., Hjelsvold, M. et al. 2000. The Environmental Impact Factor—A Proposed Tool for Produced Water Impact Reduction, Management and Regulation. Presented at the SPE International Conference on Health, Safety and Environment in Oil and Gas Exploration and Production, Stavanger, Norway, 26–28 June. SPE-61178-MS. https://doi.org/10.2118/61178-MS.
Khaleghi, M., Gabe, D. R., and Richardson, M. O. W. 1979. Characteristics of Manganese Phosphate Coatings for Wear-Resistance Applications. Wear 55 (2): 277–287. https://doi.org/10.1016/0043-1648(79)90159-5.
Ledoux, Y., Lasseux, D., Favreliere, H. et al. 2011. On the Dependence of Static Flat Seal Efficiency to Surface Defects. Int. J. Pres. Ves. Pip. 88 (11–12): 518–529. https://doi.org/10.1016/j.ijpvp.2011.06.002.
MATLAB and Signal Processing Toolbox Reference Release 2017a. Natick, Massachusetts: The MathWorks, Inc.
Moore, P. B. and Araki, T. 1973. Hureaulite, Mn2+5 (H2O)4[PO3(OH)]2[PO4]2: Its Atomic Arrangement. Am. Mineral. 58 (3–4): 302–307.
Murtagian, G. R., Fanelli, V., Villasante, J. A. et al. 2004. Sealability of Stationary Metal-to-Metal Seals. J. Tribol. 126 (3): 591–596. https://doi.org/10.1115/1.1715103.
Narayanan, T. S. N. S. 2005. Surface Pretreatment by Phosphate Conversion Coatings—A Review. Rev. Adv. Mater. Sci. 9 (2): 130–177.
OSPAR. 2015. Guidelines for Completing the Harmonised Offshore Chemical Notification Format (HOCNF). OSPAR Agreement: 2012/05, London, UK: OSPAR Commission.
Pérez-Ràfols, F., Larsson, R., and Almqvist, A. 2016a. Modelling of Leakage on Metal-to-Metal Seals. Tribol. Int. 94 (February): 421–427. https://doi.org/10.1016/j.triboint.2015.10.003.
Pérez-Ràfols, F., Larsson, R., Lundstrüm, S. et al. 2016b. A Stochastic Two-Scale Model for Pressure-Driven Flow Between Rough Surfaces. Proc. Royal Soc. A 472 (2190): 20160069. https://doi.org/10.1098/rspa.2016.0069.
Pérez-Ràfols, F., Larsson, R., van Riet, E. J. et al. 2017. On the Flow Through Plastically Deformed Surfaces Under Unloading: A Spectral Approach. Proc. Institut. Mech. Eng. C 232 (5): 908–918. https://doi.org/10.1177/0954406217690180.
Pokorny, P., Szelag, P., Novak, M. et al. 2015. Thermal Stability of Phosphate Coatings on Steel. Metalurgija 54 (3): 489–492.
Rausch, W. 1990. The Phosphating of Metals. Stevenage, UK: Finishing Publications.
Salomon, G. 1974. Application of Systems Thinking to Tribology. A. S. L. E. Trans. 17 (4): 295–299. https://doi.org/10.1080/05698197408981469.
Stachowiak, G. and Batchelor, A. W. 2013. Engineering Tribology, fourth edition. Oxford, UK: Butterworth-Heinemann.
Totik, Y. 2006. The Corrosion Behaviour of Manganese Phosphate Coatings Applied to AISI 4140 Steel Subjected to Different Heat Treatments. Surf. Coat. Tech. 200 (8): 2711–2717. https://doi.org/10.1016/j.surfcoat.2004.10.004.
Weng, D., Jokiel, P., Uebleis, A. et al. 1997. Corrosion and Protection Characteristics of Zinc and Manganese Phosphate Coatings. Surf. Coat. Tech. 88 (1–3): 147–156. https://doi.org/10.1016/S0257-8972(96)02860-5.
Westberg, H. J., Nilsson, P. H., Rosén, B.-G. et al. 2000. Manganese Phosphating of Gears and Surface Roughness Consequence. Tribol. Ser. 38: 145–53. https://doi.org/10.1016/S0167-8922(00)80120-0.