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Measuring hydraulic fracture apertures: A comparison of methods

Cheng, C.; Hale, S.; Milsch, H.; Blum, P.

Abstract (englisch):
Hydraulic fracture apertures predominantly control fluid transport in fractured rock masses. Hence, the objective of the current study is to investigate and compare three different laboratory-scale methods to determine hydraulic apertures in fractured (Fontainebleau and Flechtinger) sandstone samples with negligible matrix permeability. Direct measurements were performed by using a flow-through apparatus and a transient-airflow permeameter. In addition, a microscope camera permitted measuring the mechanical fracture apertures from which the corresponding hydraulic apertures were indirectly derived by applying various empirical correlations. Single fractures in the sample cores were generated artificially either by axial splitting or by a saw cut resulting in hydraulic apertures that ranged between 8 and 66 µm. Hydraulic apertures, accurately determined by the flow-through apparatus, are used to compare results obtained by the other methods. The transient-airflow permeameter delivers accurate values, particularly when repeated measurements along the full fracture width are performed. In this case, the derived mean hydraulic fracture apertures are in excellent quantitative agreement. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000128205
Veröffentlicht am 18.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 11.12.2020
Sprache Englisch
Identifikator ISSN: 1869-9510, 1869-9529
KITopen-ID: 1000128205
Erschienen in Solid earth
Verlag Copernicus Publications
Band 11
Heft 6
Seiten 2411-2423
Nachgewiesen in Scopus
Web of Science
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