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Chemo-hydro-geomechanics in acidizing assisted hydraulic fracturing

Publication ,  Conference
Hu, MM; Tang, X; Hueckel, T
Published in: E3S Web of Conferences
November 18, 2020

Hydraulic fracturing has been widely used for unconventional reservoirs especially after the technique of horizontal drilling was invented. Acidizing treatment is often incorporated as a propagation enhancement of fractures, in particular, for very tight, low-permeability carbonate-rich reservoirs. How an individual crack propagates into a stressed medium subject to fluid pressure acting on the crack surfaces and meanwhile being affected by the chemically aggressive environment is still an open question. This short paper investigates the fundamental coupled chemo-hydro-geomechanics as encountered in typical scenarios of hydraulic fracturing, with a specific focus on the role of acidizing treatment. The constitutive relations consisting of a reactive-chemo-elastic and a reactive-chemo-plastic formulation are presented, followed by the coupling with geochemical processes, namely reactive-diffusion equations. Numerical investigations of two representative cases within the chemo-elastically defined regime are presented, featuring a laboratory injection test and in-situ stress conditions of a deep geothermal reservoir, respectively. The results have demonstrated that the chemical dissolution process plays a critical role in the distribution of circumferential stress around the crack tip as well as the evolution of crack propagation, and that acidizing treatment may accelerate cracking exponentially after sufficient chemical exposure.

Duke Scholars

Published In

E3S Web of Conferences

DOI

EISSN

2267-1242

ISSN

2555-0403

Publication Date

November 18, 2020

Volume

205
 

Citation

APA
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ICMJE
MLA
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Hu, M. M., Tang, X., & Hueckel, T. (2020). Chemo-hydro-geomechanics in acidizing assisted hydraulic fracturing. In E3S Web of Conferences (Vol. 205). https://doi.org/10.1051/e3sconf/202020503003
Hu, M. M., X. Tang, and T. Hueckel. “Chemo-hydro-geomechanics in acidizing assisted hydraulic fracturing.” In E3S Web of Conferences, Vol. 205, 2020. https://doi.org/10.1051/e3sconf/202020503003.
Hu MM, Tang X, Hueckel T. Chemo-hydro-geomechanics in acidizing assisted hydraulic fracturing. In: E3S Web of Conferences. 2020.
Hu, M. M., et al. “Chemo-hydro-geomechanics in acidizing assisted hydraulic fracturing.” E3S Web of Conferences, vol. 205, 2020. Scopus, doi:10.1051/e3sconf/202020503003.
Hu MM, Tang X, Hueckel T. Chemo-hydro-geomechanics in acidizing assisted hydraulic fracturing. E3S Web of Conferences. 2020.
Journal cover image

Published In

E3S Web of Conferences

DOI

EISSN

2267-1242

ISSN

2555-0403

Publication Date

November 18, 2020

Volume

205