Geochemical interactions between hydraulic fracturing fluid and fractured Whitby Mudstone

We examine how a mechanically-induced fracture network may influence geochemical reaction between shale and stimulation fluid used in hydraulic fracturing. Two different types of bedding-parallel fractures, a simple fracture between bedding planes and a damage zone with multiple fractures, were indu...

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Bibliographic Details
Published inE3S Web of Conferences Vol. 98; p. 2004
Main Authors Kaszuba, John, Houben, Maartje E., Hangx, Suzanne J.T.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 01.01.2019
Subjects
Dissolved inorganic carbon
Geochemistry
Hydraulic fracturing
Jurassic
Mudstone
pH effects
Shale
Shales
Stimulation
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Summary:We examine how a mechanically-induced fracture network may influence geochemical reaction between shale and stimulation fluid used in hydraulic fracturing. Two different types of bedding-parallel fractures, a simple fracture between bedding planes and a damage zone with multiple fractures, were induced in the Whitby Mudstone (Early Jurassic) from the UK. Both fractured shales were subsequently reacted with stimulation fluid at 10 MPa and 100°C for about 2000 hours. pH increased from 2.1 to about 6 after 1000 hours of reaction in both shales, but pH increased slightly more rapidly by reaction in the shale with the damage zone. Total dissolved inorganic carbon evolved in similar fashion in both experiments and did not readily distinguish between the two styles of fracturing induced in the Whitby Mudstone.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/20199802004