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Title: Measurement of in-situ stress in salt and rock using NQR techniques

Abstract

A discussion of how stress and strain affect the quantities which can be measured in an NQR experiment shows that, for stresses of the magnitude to be expected at depths up to about 10,000 feet, quadrupole coupling constants will fall in the range of 1 to 10 kHz for both the sodium and chloride ions in NaCl. The most promising system involves pulsed nuclear double resonance detection; and alterative is to observe the quadrupolar splitting of the NMR signal. Choices to be made in the measurement and mapping techniques are discussed. The well-known perturbation of the homogenous stress field in the neighborhood of a borehole is shown to be advantageous from the point of view of obtaining directional information on the stress. Construction and operation of a borehole stress sensor are considered. The NQR technique seems feasible for measuring the magnitude and direction of underground stress with a resolution of about 25 psi, or 2.5% at 1000 psi. Downhole instrumentation suitable for in-situ determinations of stress appears within the state of the art. Additional tasks required on the project are identified.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
6458652
Report Number(s):
LBL-11895
TRN: 81-008928
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ROCKS; STRESSES; SALT DEPOSITS; MEASURING METHODS; BOREHOLES; COUPLING; FEASIBILITY STUDIES; NUCLEAR QUADRUPOLE RESONANCE; SODIUM CHLORIDES; UNDERGROUND; ALKALI METAL COMPOUNDS; CAVITIES; CHLORIDES; CHLORINE COMPOUNDS; GEOLOGIC DEPOSITS; HALIDES; HALOGEN COMPOUNDS; LEVELS; RESONANCE; SODIUM COMPOUNDS; 580300* - Mineralogy, Petrology, & Rock Mechanics- (-1989); 052002 - Nuclear Fuels- Waste Disposal & Storage

Citation Formats

Schempp, E, Hirschfeld, T, and Klainer, S. Measurement of in-situ stress in salt and rock using NQR techniques. United States: N. p., 1980. Web. doi:10.2172/6458652.
Schempp, E, Hirschfeld, T, & Klainer, S. Measurement of in-situ stress in salt and rock using NQR techniques. United States. https://doi.org/10.2172/6458652
Schempp, E, Hirschfeld, T, and Klainer, S. 1980. "Measurement of in-situ stress in salt and rock using NQR techniques". United States. https://doi.org/10.2172/6458652. https://www.osti.gov/servlets/purl/6458652.
@article{osti_6458652,
title = {Measurement of in-situ stress in salt and rock using NQR techniques},
author = {Schempp, E and Hirschfeld, T and Klainer, S},
abstractNote = {A discussion of how stress and strain affect the quantities which can be measured in an NQR experiment shows that, for stresses of the magnitude to be expected at depths up to about 10,000 feet, quadrupole coupling constants will fall in the range of 1 to 10 kHz for both the sodium and chloride ions in NaCl. The most promising system involves pulsed nuclear double resonance detection; and alterative is to observe the quadrupolar splitting of the NMR signal. Choices to be made in the measurement and mapping techniques are discussed. The well-known perturbation of the homogenous stress field in the neighborhood of a borehole is shown to be advantageous from the point of view of obtaining directional information on the stress. Construction and operation of a borehole stress sensor are considered. The NQR technique seems feasible for measuring the magnitude and direction of underground stress with a resolution of about 25 psi, or 2.5% at 1000 psi. Downhole instrumentation suitable for in-situ determinations of stress appears within the state of the art. Additional tasks required on the project are identified.},
doi = {10.2172/6458652},
url = {https://www.osti.gov/biblio/6458652}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Dec 01 00:00:00 EST 1980},
month = {Mon Dec 01 00:00:00 EST 1980}
}