Some aspects of air-entrainment on decay rates in hydraulic pulse tests

A. P.S. Selvadurai, Y. Ichikawa

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Important factors that can influence interpretation of the pulse tests include the compressibility and viscosity of the fluid that either saturates the pore space of the rock or is used to pressurize the chamber, which generates the pressure pulse. Fluid compressibility can be influenced by entrained air. This paper examines theoretically, the influence of compressibility and viscosity variations in both the interstitial pore water and within the pressurizing chamber, on the performance of the hydraulic pulse test. Convenient analytical results can be derived to account for variations in compressibility and viscosity resulting from entrained air. Theoretical results indicate that the entrained gas content can have an appreciable influence on the pressure decay curves, and particularly high volume fractions of the entrained air can influence the estimation of the permeability from hydraulic pulse tests. The paper concludes with a brief discussion of the influence of dissolved air on the performance of pulse tests.

    Original languageEnglish
    Pages (from-to)38-45
    Number of pages8
    JournalEngineering Geology
    Volume165
    DOIs
    Publication statusPublished - Oct 24 2013

    Keywords

    • Air-entrainment
    • Compressibility of pore fluid
    • Hydraulic pulse tests
    • Permeability measurement
    • Pulse decay patterns
    • Rocks with gassy fluids

    ASJC Scopus subject areas

    • Geotechnical Engineering and Engineering Geology
    • Geology

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