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Author ORCID Identifier
N/A
AccessType
Open Access Dissertation
Document Type
dissertation
Degree Name
Doctor of Philosophy (PhD)
Degree Program
Civil Engineering
Year Degree Awarded
2018
Month Degree Awarded
September
First Advisor
Carlton L. Ho
Second Advisor
David A. Reckhow
Third Advisor
Guoping Zhang
Fourth Advisor
Baoshan Xing
Subject Categories
Geotechnical Engineering
Abstract
Mitigation and prevention of shale-formation damage caused by hydraulic-fracturing fluid/rock interactions play an important role in well-production stability and subsequent refracturing design. This study presents three experimental investigations on the interaction of water/shale, fluid/clay, and fluid/shale. A series of experiments were designed to investigate fluid/shale interactions: hydrophilic to hydrophobic alteration through chemical-vapor deposition, nanoindentation testing on shale sample, geotechnical laboratory experiments on contaminated clay, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscope (SEM) on shale sample. A clay-matrix-based data-screening criterion is proposed for nanoindentation. The continuous-stiffness-measurment (CSM) method is proved to have better definition and characterization of softening of shale based on the proposed criterion. This study furthered the numerical model of clay deformation by Hattab and Chang (2015) by considering different pore fluid concentration. The fracturing fluid contaminated clay produced changes of geotechnical properties. Based on the proposed criterion and designed experiments, fracturing fluid contaminated shale was observed to gain 4 to 6% of NaCl. However, all other minerals contents are found to decrease after the shale powder-fluid interaction. A characteristic depth was proposed to consider reduction of hardness and mineral content at the same time. Moreover, an empirical equation was proposed to describe fracture toughness of shale by using a selection of indentation depth, its corresponding hardness and Young’s modulus.
DOI
https://doi.org/10.7275/12414592
Recommended Citation
Yang, Zhenning, "EXPERIMENTAL INVESTIGATION OF HYDRAULIC FRACTURING FLUID ON SHALE AND SOIL" (2018). Doctoral Dissertations. 1399.
https://doi.org/10.7275/12414592
https://scholarworks.umass.edu/dissertations_2/1399