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Hydraulically controlled discrete sampling from open boreholes

January 1, 2013

Groundwater sampling from open boreholes in fractured-rock aquifers is particularly challenging because of mixing and dilution of fluid within the borehole from multiple fractures. This note presents an alternative to traditional sampling in open boreholes with packer assemblies. The alternative system called ZONFLO (zonal flow) is based on hydraulic control of borehole flow conditions. Fluid from discrete fractures zones are hydraulically isolated allowing for the collection of representative samples. In rough-faced open boreholes and formations with less competent rock, hydraulic containment may offer an attractive alternative to physical containment with packers. Preliminary test results indicate a discrete zone can be effectively hydraulically isolated from other zones within a borehole for the purpose of groundwater sampling using this new method.

Publication Year 2013
Title Hydraulically controlled discrete sampling from open boreholes
DOI 10.1111/gwat.12120
Authors Philip T. Harte
Publication Type Article
Publication Subtype Journal Article
Series Title Groundwater
Index ID 70159475
Record Source USGS Publications Warehouse
USGS Organization NH/VT office of New England Water Science Center