Nuclear magnetic resonance imaging of simulated voids in cement slurries

Autor: Timothy P.L. Roberts, T. A. Carpenter, Laurance D. Hall, E. J. Fordham, Christopher Hall, Geoffrey C. Maitland
Rok vydání: 1991
Předmět:
Zdroj: AIChE Journal. 37:1895-1899
ISSN: 1547-5905
0001-1541
DOI: 10.1002/aic.690371213
Popis: This paper reports on the initial technological development of nuclear magnetic resonance (NMR) imaging which was motivated primarily by applications in medicine and biology: however, increasing attention is now being given to applications to nonliving systems such as porous media and polymer science. These applications place higher demands on hardware performance and ingenuity in imaging protocol design, principally because of the broader linewidths and shorter relaxation times found a such heterogeneous systems compared with those of biological tissues. NMR relaxometry in heterogeneous systems has provided insight into pore sizes, surface area, and molecular dynamics in porous media, suspensions and hydrating cement. Most of the latter are studies of the [sup 1]H (proton) resonance of water in a hydrating slurry. The motivation of this study was to develop a technique to which movement of gas voids within a slurry could be examined experimentally. Natural gas migration is an important failure mode of oil-well cementing operations. The imaging speeds achieved (down to 5 seconds per slice-selective image) indicate that the technique is feasible for such applications. Other viable applications may be in imaging aggregate distribution or crack detection in model concretes and in ceramic casting, or indeed in void detection in anymore » other proton-containing material with comparable values of its NMR parameters.« less
Databáze: OpenAIRE
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