Persistent Link:
http://hdl.handle.net/10150/191483
Title:
Influence of water well design on neutron logging
Author:
Ralston, Dale R.
Issue Date:
1967
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The lack of calibration to a wide range of well conditions has limited the application of the University of Arizona’s neutron instruments. The calibration is necessary before quantitative results may be obtained. A survey of the literature on the neutron method is presented from petroleum industry, soil science, and groundwater hydrology sources. A controlled system, consisting of nine well casings in a homogeneous unconsolidated medium, was constructed, for the study. Two neutron-neutron instruments equipped with Am-Be sources of lOO-mc (millicurie) and 3-c (curie) strength, were operated in the system. Data was collected under saturated and water-table conditions to determine the quantitative reaction and the qualitative discrimination of the instruments to the range of variables encountered in well design. The diameter and composition of well casing and the position of the neutron probe in the casing were found to be important factors in neutron logging. The largest diameter of casing in which the 100-mo instrument can be applied was found to be 4 inches. The 3-c instrument was effective in casings as large as 16 inches in diameter. The calibration relationship between moisture content and chart deflection for the 3-c instrument was defined for one value of moisture content.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Wells.; Soil moisture -- Measurement.; Neutron counters.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Wright, Jerome J.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleInfluence of water well design on neutron loggingen_US
dc.creatorRalston, Dale R.en_US
dc.contributor.authorRalston, Dale R.en_US
dc.date.issued1967en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe lack of calibration to a wide range of well conditions has limited the application of the University of Arizona’s neutron instruments. The calibration is necessary before quantitative results may be obtained. A survey of the literature on the neutron method is presented from petroleum industry, soil science, and groundwater hydrology sources. A controlled system, consisting of nine well casings in a homogeneous unconsolidated medium, was constructed, for the study. Two neutron-neutron instruments equipped with Am-Be sources of lOO-mc (millicurie) and 3-c (curie) strength, were operated in the system. Data was collected under saturated and water-table conditions to determine the quantitative reaction and the qualitative discrimination of the instruments to the range of variables encountered in well design. The diameter and composition of well casing and the position of the neutron probe in the casing were found to be important factors in neutron logging. The largest diameter of casing in which the 100-mo instrument can be applied was found to be 4 inches. The 3-c instrument was effective in casings as large as 16 inches in diameter. The calibration relationship between moisture content and chart deflection for the 3-c instrument was defined for one value of moisture content.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshWells.en_US
dc.subject.lcshSoil moisture -- Measurement.en_US
dc.subject.lcshNeutron counters.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairWright, Jerome J.en_US
dc.identifier.oclc214383394en_US
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