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• W4232138840 abstract "Non-Equilibrium Adsorption and Precipitation of Scale Inhibitors: Corefloods and Mathematical Modelling H. Zhang; H. Zhang BG International Search for other works by this author on: This Site Google Scholar E.J. Mackay; E.J. Mackay Heriot-Watt University Search for other works by this author on: This Site Google Scholar P. Chen; P. Chen Champion Technologies Search for other works by this author on: This Site Google Scholar K.S. Sorbie K.S. Sorbie Heriot-Watt University Search for other works by this author on: This Site Google Scholar Paper presented at the International Oil and Gas Conference and Exhibition in China, Beijing, China, November 2000. Paper Number: SPE-64755-MS https://doi.org/10.2118/64755-MS Published: November 07 2000 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Zhang, H., Mackay, E.J., Chen, P., and K.S. Sorbie. Non-Equilibrium Adsorption and Precipitation of Scale Inhibitors: Corefloods and Mathematical Modelling. Paper presented at the International Oil and Gas Conference and Exhibition in China, Beijing, China, November 2000. doi: https://doi.org/10.2118/64755-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Oil and Gas Conference and Exhibition in China Search Advanced Search AbstractAdsorption/desorption and precipitation/dissolution are thought to be the two major mechanisms operating in the retention and release of scale inhibitor in squeeze treatments in an oil reservoir. The general nature and extent of the scale inhibitor adsorption process is determined principally by the equilibrium isotherm, although the shape of the inhibitor return curve may be significantly modified by kinetic effects for a specific squeeze practice. For a precipitation squeeze process, the solubility of the inhibitor-calcium complex and the rate of dissolution are currently thought to be two main factors that govern the return curves in our computer modelling studies. Experimental coreflood techniques can be used to provide inhibitor breakthrough profiles and these effluent concentration data can then be used to derive isotherms for the adsorption systems or to test the validity of the above precipitation mechanisms.This paper presents results from a series of flow rate varying adsorption and precipitation laboratory corefloods for a penta-phosphonate (DETPMP) and a poly-carboxylate (PPCA). This experimental data is the most complete and accurate ever produced and is of a quality that allows us to test the details of the above mechanisms. A general analysis and discussion of the adsorption isotherm derivation is provided and modelling results for the non-equilibrium adsorption corefloods are reported. The significance of these results for field applications is discussed.IntroductionIn a scale inhibitor squeeze treatment, the interaction between scale inhibitor and rock system is either through an adsorption/desorption1–10 or a precipitation/dissolution6,11–15 (phase separation) mechanism. Adsorption of inhibitors is thought to occur through electrostatic and Van der Waals interactions between the inhibitor and the formation minerals. Precipitation inhibitor squeeze treatments were originally proposed as a method of extending the squeeze lifetime beyond that obtained in an adsorption treatment of the same generic scale inhibitor. For such processes, the main inhibitor retention mechanism within rock formation is thought to be due to the formation of sparingly soluble calcium/inhibitor complex. The complex may be in the form of an actual solid or a separate gel-like liquid phase.To achieve longer squeeze life times from the existing inhibitor products or the potential ones under development, a better understanding of the mechanisms controlling the retention and release of the inhibitors is obviously very important. The environment into which the chemical is to be injected must also be fully appreciated. On this basis, computer modelling tools can be developed to provide an insight into the processes occurring in squeeze treatments, and eventually to allow the analysis and design of improved squeeze treatment designs. Keywords: paraffin remediation, wax inhibition, hydrate remediation, ppca, rate parameter, precipitation flood, scale remediation, asphaltene remediation, remediation of hydrates, coreflood Subjects: Production Chemistry, Metallurgy and Biology, Improved and Enhanced Recovery, Inhibition and remediation of hydrates, scale, paraffin / wax and asphaltene This content is only available via PDF. 2000. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4232138840 title "Non-Equilibrium Adsorption and Precipitation of Scale Inhibitors: Corefloods and Mathematical Modelling" @default.
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