Modification and application of TOUGH2 as a variable-density, saturated-flow code and comparison to SWIFT II results

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Human intrusion scenarios at the Waste Isolation Pilot Plant (WIPP) involve penetration of the repository and an underlying brine reservoir by a future borehole. Brine and gas from the brine reservoir and the repository may flow up the borehole and into the overlying Culebra formation, which is saturated with water containing different amounts of dissolved `solids resulting in a spatially varying density. Current modeling approaches involve perturbing a steady-state Culebra flow field by inflow of gas and/or brine from a breach borehole that has passed through the repository. Previous studies simulating steady-state flow in the Culebra have been done. One ... continued below

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6 p.

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Christian-Frear, T.L. & Webb, S.W. April 1, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Human intrusion scenarios at the Waste Isolation Pilot Plant (WIPP) involve penetration of the repository and an underlying brine reservoir by a future borehole. Brine and gas from the brine reservoir and the repository may flow up the borehole and into the overlying Culebra formation, which is saturated with water containing different amounts of dissolved `solids resulting in a spatially varying density. Current modeling approaches involve perturbing a steady-state Culebra flow field by inflow of gas and/or brine from a breach borehole that has passed through the repository. Previous studies simulating steady-state flow in the Culebra have been done. One specific study by LaVenue et al. (1990) used the SWIFT 2 code, a single-phase flow and transport code, to develop the steady-state flow field. Because gas may also be present in the fluids from the intrusion borehole, a two-phase code such as TOUGH2 can be used to determine the effect that emitted fluids may have on the steady-state Culebra flow field. Thus a comparison between TOUGH2 and SWIFT2 was prompted. In order to compare the two codes and to evaluate the influence of gas on flow in the Culebra, modifications were made to TOUGH2. Modifications were performed by the authors to allow for element-specific values of permeability, porosity, and elevation. The analysis also used a new equation of state module for a water-brine-air mixture, EOS7 (Pruess, 1991), which was developed to simulate variable water densities by assuming a miscible mixture of water and brine phases and allows for element-specific brine concentration in the INCON file.

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6 p.

Notes

INIS; OSTI as DE95009596

Source

  • 1995 TOUGH workshop, Berkeley, CA (United States), 20-22 Mar 1995

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  • Other: DE95009596
  • Report No.: SAND--95-0568C
  • Report No.: CONF-9503116--3
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/46595 | External Link
  • Office of Scientific & Technical Information Report Number: 46595
  • Archival Resource Key: ark:/67531/metadc676301

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  • April 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • April 14, 2016, 8:40 p.m.

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Christian-Frear, T.L. & Webb, S.W. Modification and application of TOUGH2 as a variable-density, saturated-flow code and comparison to SWIFT II results, report, April 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc676301/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.