Scale-Inhibitor Application in Northern Alberta: A Case History of an Ultrahigh-Temperature Scale-Inhibition Solution in Fire-Tube Heater Treaters
- Jonathan J. Wylde (Clariant Oil Services UK Ltd.) | Jeff McMahon (Clariant Corp.) | Steven Mayner (Clariant Canada Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Projects, Facilities & Construction
- Publication Date
- September 2011
- Document Type
- Journal Paper
- 108 - 114
- 2011. Society of Petroleum Engineers
- 4.3.4 Scale
- Ultra-high temperature, Scale inhibitor, Scale, Fire tubes
- 0 in the last 30 days
- 288 since 2007
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This paper reports a challenging and unique scale-forming environment in northern Alberta, Canada. Calcite was forming on the fire tubes in a series of treaters. Bulk fluid temperature was 110°C, but skin temperature of the fire tubes was in excess of 450°C. This created an extremely high scaling potential.
The paper provides background on the field case history with a detailed description of the process and the scale-forming environment. An in-depth scale-modeling study characterizing the scaling up to 200°C is provided.
Further laboratory studies are reported, including performance testing on candidate scale inhibitors and differential scanning calorimetry (DSC) to determine their molecular stability. The testing looked at scale inhibitors and investigated the direct inhibition properties, as well as any dispersion properties to prevent surface adsorption of scale on the fire tubes.
The testing found that the incumbent scale inhibitor (phosphonate based) was a good product for the bulk scale inhibition but was not stable at the temperature of the fire tubes. The most thermally stable scale inhibitors tested were polymaleic acid copolymers and polymeric acrylic acids of low-to-medium molecular weight.
No scale inhibitors were tested to be fully stable up to 450°C, but it was found in field application that the best product identified through laboratory testing was sufficient to delay the scale formation on the fire tubes. It is hypothesized that the product was stable at high temperature for the residence time of fluid in the treaters or imparted some degree of scale inhibition even after thermal molecular scission.
The paper concludes with data of the fire-tube change-out history highlighting the step change in performance when applying the polymeric inhibitor quantified by change-out frequency and presence of hot spots.
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Amjad, Z. and Zuhl, R.W. 2008a. Heat Treatment of Synthetic Polymers asCaCO3 Inhibitors--Part I. Materials Performance 47 (2):46-49.
Amjad, Z. and Zuhl, R.W. 2008b. Heat Treatment of Synthetic Polymers asCaCO3 Inhibitors--Part II. Materials Performance 47 (3):50.
Cenegy, L.M., Griffith, D.F., and Hobbs, G.W.M. 1991. Method of treatinggeothermal wells with acrylate/acrylamide scale inhibitor. US Patent No.5,044,439.
Deer, W.A., Howie, R.A., and Zussman, J. 1983. An Introduction to theRock Forming Minerals, 14th edition. London: Longman. ISBN:0-582-44210-9.
Graham, G.M., Dyer, S.J., and Shone, P. 2002. Potential Application of AmineMethylene Phosphonate-Based Inhibitor Species in HP/HT Environments forImproved Carbonate Scale Inhibitor Performance. SPE Prod & Fac 17 (4): 212-220. SPE-80284-PA. doi: 10.2118/80284-PA.
Graham, G.M., Jordan, M.M., Graham, G.C. et al. 1997. The Implication ofHP/HT Reservoir Conditions on the Selection and Application of ConventionalScale Inhibitors: Thermal Stability Studies. Paper SPE 37274 presented at theInternational Symposium on Oilfield Chemistry, Houston, 18-21 February. doi: 10.2118/37274-MS.
Gruner, H.P. 1996. Downhole scale control in high temperature and highcalcium environment. Presented at the NIF 7th NIF International Oil FieldChemical Symposium, Geilo, Norway, 17-20 March.
Klein, C., Hurlbut, C.S. Jr., and Dana, J.D. 1993. Manual ofMineralogy, 21st edition. New York: John Wiley & Sons. ISBN:0-471-57452-X.
Kotlar, H.K, Hauge, L.E., Solbakken, K., Gangstad, A., Gjersvold, B., andSivertsen, L.M. 2006. Influence of Thermal Aging on Treatment Chemicals inHP/HT Applications: From Development of Equipment to Field Application. PaperSPE 98337 presented at the International Symposium and Exhibition on FormationDamage Control, Lafayette, Louisiana, USA, 15-17 February. doi: 10.2118/98337-MS.
Masler, W.F. 1982. Characterization and Thermal Stability of Polymers forBoiler Treatment. Presented at the 43rd International Water Conference,Pittsburgh, Pennsylvania, USA, 25-27 October.
McGaugh, M.C. and Kottle, S. 1967. The thermal degradation of poly(acrylicacid). Journal of Polymer Science, Part B: Polymer Letters 5 (9): 817-820. doi:10.1002/pol.1967.110050916.
Wat, R., Hauge, L.-E., Solbakken, K., Wennberg, K.E., Sivertsen, L.M., andGjersvold, B. 2007. Squeeze Chemical for HT Applications--Have We DiscardedPromising Products by Performing Unrepresentative Thermal Aging Tests? PaperSPE 105505 presented at the International Symposium on Oilfield Chemistry,Houston, 28 February-2 March. doi: 10.2118/105505-MS.
Wat, R., Wennberg, K., Holden, R., Hustad, B., Heath, S., Archibald, M., andSingdahlsen, K. 2008. The Challenges Associated With Performing and CombiningScale Dissolver and Squeeze Treatments in Kristin--A Subsea HP/HT GasCondensate Field. Paper SPE 114079 presented at the SPE International OilfieldScale Conference, Aberdeen, 28-29 May. doi: 10.2118/114079-MS.
Wilson, D. and Harris, K. 2010. Development of a ‘Green' HydrothermallyStable Scale Inhibitor for Topside and Squeeze Treatment. Paper 10135.Presented at the NACE International CORROSION 2010 Annual Conference andExposition, San Antonio, Texas, USA, 14-18 March.
Wylde, J.J., McKay, S.F., and Falla, M. 2003. Development of a SuitableCaCO3 Scale Inhibitor System for use in Ultrahigh Temperature and PressureWells. Paper SPE 80398 presented at the International Symposium on OilfieldScale, Aberdeen, 29-30 January. doi: 10.2118/80398-MS.