Modeling of Gel Barrier Formation by Using Horizontal Wells
Publication: Journal of Environmental Engineering
Volume 128, Issue 10
Abstract
Barrier systems have recently been employed for contaminant migration control and/or as an integral part of in situ remediation efforts. In this study, we investigate horizontal gel barrier systems constructed by injecting colloidal silica (CS) through horizontal pipes in unsaturated soils. The gel barrier systems are achieved from conversion of a gelling solution to a solid as gelation progresses. The gelation process is initiated in the CS with the addition of electrolytes such as NaCl. The system consisting of a set of horizontal wells is simulated by a vertical two-dimensional mathematical model and the effects of operating parameters and soil properties on emplacement of a CS barrier are evaluated. Laboratory-scale numerical experiments show that an increase in total CS release volume yields a better barrier formation by allowing two gel mixture plumes to merge halfway between each pair of injection pipes thus forming a continuous low-permeability layer between adjacent injection wells. In field-scale numerical experiments, direct correlations between the size of the horizontal gel layer and operating parameters such as the injection pressure head and gel point of the injected CS (a property relevant to NaCl concentration) are observed.
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References
Celia, M. A., Bouloutas, E. T., and Zarba, R. L.(1990). “A general mass-conservative numerical solution for the unsaturated flow equation.” Water Resour. Res., 26, 1483–1496.
Clement, T. P., Hooker, B. S., and Skeen, R. S.(1996). “Macroscopic models for predicting changes in saturated porous media properties caused by microbial growth.” Ground Water, 34, 934–942.
Corey, A. T. (1986). Mechanics of immiscible fluids in porous media, Water Resources, Littleton, Colo.
Durmusoglu, E., and Corapcioglu, M. Y.(2000). “Experimental study of horizontal barrier formation by colloidal silica.” J. Environ. Eng., 126(9), 833–841.
Elnawawy, O. A., Valocchi, A. J., and Ougouag, A. M.(1990). “The cell analytical-numerical methods for solution of the advection-dispersion equation: Two-dimensional problems.” Water Resour. Res., 26(11), 2705–2716.
Federal Register. (1991). Solid Waste Disposal Facility Criteria: Final Rule, federal register, 40 CFR Parts 257 and 258 (October 9, 1991).
Finsterle, S., Moridis, G. J., Pruess, K., and Persoff, P. (1994). “Physical barriers formed from gelling liquids: 1. Numerical design of laboratory and field experiments.” Rep. No. LBL-35113, Lawrence Berkeley National Laboratory, Berkeley, Calif.
Haverkamp, R., Vauclin, M., Touma, J., Wierenga, P. J., and Vachaud, G.(1977). “A comparison of numerical simulation models for one-dimensional infiltration.” Soil Sci. Soc. Am. J., 41, 285–294.
Iler, R. K. (1979). The chemistry of silica: Solubility, polymerization, colloid and surface properties, and biochemistry, Wiley, New York.
Javandel, I., Doughty, C., and Tsang, C.-F. (Eds.) (1984). Groundwater transport: Handbook of mathematical models, Water Resour. Monogr. Ser., AGU, Washington, D.C., Vol. 10.
Jurinak, J. J., Summers, L. E., and Bennett K. E. (1989). “Oilfield application of colloidal silica gel.” Paper No. SPE 18505, presented at the 1989 SPE Intl. Symp. on Oilfield Chemistry, Houston, Feb. 8–10.
Jurinak, J. J., and Summers, L. E.(1991). “Oilfield applications of colloidal silica gel.” SPEPE, 6, 406–412.
Karol, R. H. (1990). Chemical grouting, Dekker, New York.
Kim, M., and Corapcioglu, M. Y.(2002). “Gel barrier formation in unsaturated porous media.” J. Contam. Hydrol., 56, 75–98.
Koval, E. J. (1963). “A method for predicting the performance of unstable miscible displacement in heterogeneous media.” SPEJ, June, 145–154;
Trans. AIME, 228145.
Liang, J., Sun, H., and Seright, R. S. (1992). “Reduction of oil and water permeabilities using gels.” Paper No. SPE/DOE 24195, presented at the 1992 SPE/DOE 8th Symp. on Enhanced Oil Recovery, Tulsa, Okla., April 22–24.
Noll, M. R., Bartlett, C., and Dochat, T. M. (1992). “In situ permeability reduction and chemical fixation using colloidal silica.” Presented at the 1992 Proc., 6th Natl. Outdoor Action Conf. on Aquifer Restoration, Las Vegas, May 11–13.
Philip, J. R.(1957). “The theory of infiltration 2.” Soil Sci., 83, 435–448.
Rumer, R. R., and Ryan, M. E. (1995). Barrier containment technologies for environmental remediation applications, Wiley, New York.
Seright, R. S. (1993). “Reduction of gas and water permeabilities using gels.” Paper No. SPE 25855, presented at the 1993 SPE Rocky Mountain/Low Permeability Reservoir Symp., Denver, April 12–14.
Tracy, F. T.(1995). “1-D, 2-D, and 3-D analytical solutions of unsaturated flow in groundwater.” J. Hydrol., 170, 199–214.
van Genuchten, M. Th.(1980). “A closed-form equation for predicting the hydraulic conductivity of unsaturated soils.” Soil Sci. Soc. Am. J., 44, 892–898.
Yonekura, R., and Kaga, M. (1992). Current chemical grout engineering in Japan, Geotechnical Special Publication No. 30: Grouting, soil improvement, and geosynthetics, ASCE, Reston, Va., 725–736.
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Copyright © 2002 American Society of Civil Engineers.
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Received: Jul 28, 2000
Accepted: Nov 14, 2001
Published online: Sep 13, 2002
Published in print: Oct 2002
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