The Effects of Barium Sulfate Saturation Ratio, Calcium, and Magnesium on the Inhibition Efficiency: Part II Polymeric Scale Inhibitors
- Scott S. Shaw (Heriot-Watt University) | Ken Sorbie (Heriot-Watt University) | Lorraine S. Boak (Heriot-Watt University)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- November 2012
- Document Type
- Journal Paper
- 390 - 403
- 2012. Society of Petroleum Engineers
- 4.3.4 Scale, 5.2 Reservoir Fluid Dynamics, 4.2.3 Materials and Corrosion
- 1 in the last 30 days
- 518 since 2007
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In oilfield-produced waters, the barite mineral-scaling problem is a "moving target" because the seawater/formation-water (SW/FW) mixing ratio is constantly changing. Therefore, the barite saturation ratio (SR), the yield of barite precipitate, and molar ratio Ca2+/Mg2+ in the produced waters are all evolving over time.
This paper describes the effects of SR and molar ratio Ca2+/Mg2+ on the barium sulfate inhibition efficiency (IE) of nine polymeric scale inhibitors (SIs): phosphino poly carboxylic acid (PPCA); maleic acid ter-polymer (MAT)--a green SI; sulfonated PPCA (SPPCA); phosphino methylated polyamine (PMPA)--a poly-phosphonate; a generic P-functionalized copolymer (PFC); polyvinyl sulfonate (PVS); vinyl sulfonate acrylic acid copolymer (VS-Co); and cationic ter-polymers A and B (CTP-A and CTP-B). The behavior for polymers is compared with similar results for phosphonate SIs (Shaw et al. 2010). IE experiments were carried out for a wide range of SW/FW compositions (i.e., SR and molar ratio Ca2+/Mg2+ varying). The minimum-inhibitor-concentration (MIC) levels of these polymeric SIs sometimes correlate with the level of SR, but not always, which is because of Ca2+ and Mg2+ effects. When experiments were repeated but the produced-brine molar ratio Ca2+/Mg2+ was fixed, MICs always correlate with the level of SR for all nine polymers studied. However, it was observed that for SIs PPCA, MAT, and PFC, the base-case MICs (i.e., molar ratio Ca2+/Mg2+ varying) were less than the fixed-case MICs (molar ratio Ca2+/Mg2+ fixed), whereas in testing SPPCA, PMPA, PVS, VS-Co, and both the cationic ter-polymers, the converse is true (i.e., the fixed-case MIC is less than the base-case MIC). It has been demonstrated conclusively that the high [Ca2+] in the fixed-case tests causes some SI precipitation with brine Ca2+ when PPCA is being evaluated (as PPCA-Ca). Sulfonate functional groups present on polymeric SI molecules may help to prevent such incompatibility problems encountered with brine Ca2+ (e.g., SPPCA does not precipitate as SPPCA-Ca). Low levels of brine calcium (e.g., approximately 500 to 700 ppm) can be very beneficial to the IE performance of PPCA. However, when the [Ca2+] reaches a certain level (approximately 1,000 ppm or higher), this causes some precipitation of a Ca-PPCA compound. It has been illustrated that low-to-moderate Ca2+ levels are often best, and it is concluded that this is why SIs PPCA, MAT, and PFC perform better under base-case experimental conditions (lower Ca2+ mix). It has been illustrated that PMPA behaves remarkably similarly to conventional phosphonate SIs with regard to Ca2+ and Mg2+. In fact, the behavior of PMPA suggests that it is not polymeric in nature. PVS, VS-Co, and both the cationic ter-polymers are mildly affected by divalent ions Ca2+ and Mg2+, with the latter being affected more than PVS because of the presence of carboxylate functional groups.
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Bezerra, M.C., Rosario, F.F., Prais, F., and Rodrigues, J.R.P. 1999. Processfor the Controlled Precipitation of the Inhibitor Scale in a SubterraneanFormation. Paper SPE 50774 presented at the SPE International Symposium onOilfield Chemistry, Houston, 16-19 February. http://dx.doi.org/10.2118/50774-MS.
Boak, L.S., Graham, G.M., and Sorbie, K.S. 1999. The Influence of DivalentCations on the Performance of BaSO4 Scale Inhibitor Species. PaperSPE 50771 presented at the SPE International Symposium on Oilfield Chemistry,Houston, 16-19 February. http://dx.doi.org/10.2118/50771-MS.
Boak, L.S. and Sorbie, K.S. 2010. New Developments on the Analysis of ScaleInhibitors. Paper SPE 130401 presented at the SPE International Conference onOilfield Scale, Aberdeen, 26-27 May. http://dx.doi.org/10.2118/130401-MS.
Burr, B.J., Howe, T.M., and Goulding, J. 1987. The Development andApplication of a Detectable Polymeric Scale Inhibitor To Control Sulfate Scalesby Squeeze Applications. Paper SPE 16261 presented at the SPE InternationalSymposium on Oilfield Chemistry, San Antonio, Texas, USA, 4-6 February. http://dx.doi.org/10.2118/16261-MS.
Clemmit, A.F., Ballance, D.C., and Hunton, A.G. 1985. The Dissolution ofScales in Oilfield Systems. Paper SPE 14010 presented at the Offshore Europe,Aberdeen, 10-13 September. http://dx.doi.org/10.2118/14010-MS.
Davis, K.P., Fidoe, S.D., Otter, G.P., Talbot, R.E., and Veale, M.A. 2003.Novel Scale Inhibitor Polymers with Enhanced Adsorption Properties. Paper SPE80381 presented at the International Symposium on Oilfield Scale, Aberdeen,29-30 January. http://dx.doi.org/10.2118/80381-MS.
Graham, G.M., Sorbie, K.S., and Jordan, M.M. 2000. How scaleinhibitors work and how this affects test methodology. Paper OFC-1 presented atthe 4th International Conference and Exhibition on Chemistry in Industry,Manama, Bahrain, 30 October-1 November.
Graham, G.M., Boak, L.S., and Sorbie, K.S. 1997. The Influence of FormationCalcium on the Effectiveness of Generically Different Barium Sulphate OilfieldScale Inhibitors. Paper SPE 37273 presented at the International Symposium onOilfield Chemistry, Houston, 18-21 February. http://dx.doi.org/10.2118/37273-MS.
Graham, G.M., Boak, L.S., and Sorbie, K.S. 2003. The Influence ofFormation Calcium and Magnesium on the Effectiveness of Generically DifferentBarium Sulphate Oilfield Scale Inhibitors. SPE Prod & Fac 18 (1): 28-44. SPE-81825-PA. http://dx.doi.org/10.2118/81825-PA.
Hen, J., Brunger, A., Peterson, B.K., Yuan, M.D., and Renwick, J.P.1995. A Novel Scale Inhibitor Chemistry for Downhole Squeeze Application inHigh Water Producing North Sea Wells. Paper SPE 30410 presented at the OffshoreEurope, Aberdeen, 5-8 September. http://dx.doi.org/10.2118/30410-MS.
Inches, C.E., El Doueiri, K., and Sorbie, K.S. 2006. Green Inhibitors:Mechanisms in the Control of Barium Sulfate Scale. Paper NACE 06485 presentedat the NACE International CORROSION 2006 61st Annual Conference and Exposition,San Diego, California, USA, 12-16 March.
Jordan, M.M., Sorbie, K.S., Yuan, M.D., et al. 1995. Static andDynamic Adsorption of Phosphonate and Polymeric Scale Inhibitors Onto ReservoirCore From Laboratory Tests to Field Application. Paper SPE 29002 presented atthe SPE International Symposium on Oilfield Chemistry, San Antonio, Texas, USA,14-17 February. http://dx.doi.org/10.2118/29002-MS.
Jordan, M., Sorhaug, E., Marlow, D., and Graham, G. 2010. "Red" vs. "Green"Scale Inhibitors for Extending Squeeze Life--A Case Study from North Sea,Norwegian Sector. Paper NACE 10137 presented at the NACE InternationalCORROSION 2010 Annual Conference and Exposition, San Antonio, Texas, USA, 14-18March.
Malandrino, A., Yuan, M.D., Sorbie, K.S., and Jordan, M.M. 1995. MechanisticStudy and Modelling of Precipitation Scale Inhibitor Squeeze Processes. PaperSPE 29001 presented at the SPE International Symposium on Oilfield Chemistry,San Antonio, Texas, USA, 14-17 February. http://dx.doi.org/10.2118/29001-MS.
Montgomerie, H., Chen, P., Hagen, T., et al. 2009. Development of a NewPolymer Inhibitor Chemistry for Downhole Squeeze Applications. SPE Prod& Oper 24 (3): 459-465. SPE-113926-PA. http://dx.doi.org/10.2118/113926-PA.
Pardue, J.E. 1991. A New Inhibitor for Scale Squeeze Applications. Paper SPE21023 presented at the SPE International Symposium on Oilfield Chemistry,Anaheim, California, USA, 20-22 February. http://dx.doi.org/10.2118/21023-MS.
Rabaioli, M.R. and Lockhart, T.P. 1995. Solubility and Phase Behaviourof Polyacrylate Scale Inhibitors and Their Implications for PrecipitationSqueeze Treatment. Paper SPE 28998 presented at the SPE International Symposiumon Oilfield Chemistry, San Antonio, Texas, USA, 14-17 February http://dx.doi.org/10.2118/28998-MS.
Singleton, M.A., Collins, J.A., and Poynton, N. 2000. Developments inPhosphonoMethylated PolyAmine (PMPA) Scale Inhibitor Chemistry for SevereBaSO4 Scaling Conditions. Paper SPE 60216 presented at theInternational Symposium on Oilfield Scale, Aberdeen, 26-27 January. http://dx.doi.org/10.2118/60216-MS.
Shaw, S.S., Sorbie, K.S., and Boak, L.S. 2010. The Effects of BariumSulphate Saturation Ratio, Calcium and Magnesium on the Inhibition Efficiency:I Phosphonate Scale Inhibitors. Paper SPE 130373 presented at the SPEInternational Conference on Oilfield Scale, Aberdeen, 26-27 May. http://dx.doi.org/10.2118/130373-MS.
Sorbie, K.S. and Laing, N. 2004. How Scale Inhibitors Work: Mechanisms ofSelected Barium Sulphate Scale Inhibitors Across a Wide Temperature Range.Paper SPE 87470 presented at the SPE International Symposium on Oilfield Scale,Aberdeen, 26-27 May. http://dx.doi.org/10.2118/87470-MS.
Taj, S., Papavinasam, S., and Revie, R.W. 2006. Development of GreenInhibitors for Oil and Gas Applications. Paper NACE 06656 presented at the NACEInternational CORROSION 2006 61st Annual Conference and Exposition, San Diego,California, USA, 12-16 March.
Weston, J. 2008. Biochemistry of Magnesium. In The Chemistry ofOrganomagnesium Compounds, ed. Z. Rappoport and I. Marek, Chap. 8, 315-367.New York: PATAI'S Chemistry of Functional Groups, John Wiley & Sons. http://dx.doi.org/10.1002/9780470751879.ch8.