Estimates of the hydrologic impact of drilling water on core samples taken from partially saturated densely welded tuff

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The purpose of this work is to determine the extent to which drill water might be expected to be imbibed by core samples taken from densely welded tuff. In a related experimental study conducted in G-Tunnel, drill water imbibition by the core samples was observed to be minimal. Calculations were carried out with the TOUGH code with the intent of corroborating the imbibition observations. Due to the absence of hydrologic data pertaining directly to G-Tunnel welded tuff, it was necessary to apply data from a similar formation. Because the moisture retention curve was not available for imbibition conditions, the drainage ... continued below

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25 p.

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Buscheck, T.A. & Nitao, J.J. September 1, 1987.

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Description

The purpose of this work is to determine the extent to which drill water might be expected to be imbibed by core samples taken from densely welded tuff. In a related experimental study conducted in G-Tunnel, drill water imbibition by the core samples was observed to be minimal. Calculations were carried out with the TOUGH code with the intent of corroborating the imbibition observations. Due to the absence of hydrologic data pertaining directly to G-Tunnel welded tuff, it was necessary to apply data from a similar formation. Because the moisture retention curve was not available for imbibition conditions, the drainage curve was applied to the model. The poor agreement between the observed and calculated imbibition data is attributed primarily to the inappropriateness of the drainage curve. Also significant is the value of absolute permeability (k) assumed in the model. Provided that the semi-log plot of the drainage and imbibition moisture retention curves are parallel within the saturation range of interest, a simple relationship exists between the moisture retention curve, k, and porosity ({phi}) which are assumed in the model and their actual values. If k and {phi} are known, we define the hysteresis factor {lambda} to be the ratio of the imbibition and drainage suction pressures for any saturation within the range of interest. If k and {phi} are unknown, {lambda} also accounts for the uncertainties in their values. Both the experimental and modeling studies show that drill water imbibition by the core has a minimal effect on its saturation state. 22 refs., 6 figs., 2 tabs.

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25 p.

Notes

NTIS, PC A03/MF A01 - OSTI; OSTI as DE89003730

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  • Other Information: PBD: Sep 1987

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  • Other: DE89003730
  • Report No.: UCID--21294
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/60630 | External Link
  • Office of Scientific & Technical Information Report Number: 60630
  • Archival Resource Key: ark:/67531/metadc696829

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  • September 1, 1987

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 18, 2016, 3:26 p.m.

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Buscheck, T.A. & Nitao, J.J. Estimates of the hydrologic impact of drilling water on core samples taken from partially saturated densely welded tuff, report, September 1, 1987; California. (digital.library.unt.edu/ark:/67531/metadc696829/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.