@Article{icces.2023.09168,
AUTHOR = {Kaituo Jiao, Dongxu Han, Bo Yu},
TITLE = {Investigation of Pore-Scale THMC Acid Fracturing Process Considering  Heat Conduction Anisotropy},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {27},
YEAR = {2023},
NUMBER = {4},
PAGES = {1--5},
URL = {http://www.techscience.com/icces/v27n4/55198},
ISSN = {1933-2815},
ABSTRACT = {Acid fracturing is critical to improving the connectivity inside underground reservoirs, which involves a 
complex thermal-hydro-mechanical-chemical (THMC) coupling process, especially deep underground. Heat 
conduction anisotropy is one of the intrinsic properties of rock. It determines the heat response distribution 
inside the rock and alters the temperature evolution on the reactive surface of fractures and pores. In 
another way, the rock dissolution rate is closely related to the reactive surface temperature. Predictably, 
heat conduction anisotropy leads to different rock dissolution morphologies from that of the heat 
conduction isotropy situation, then the cracks distribution and permeability of rock would also be 
significantly changed. This work uses a pore-scale THMC coupled model recently developed by us to 
investigate the effect of heat conduction anisotropy on the THMC coupled acid fracturing process. The model 
adopts the lattice Boltzmann and discrete element methods to calculate the particle mechanical behaviors 
and hydro-mechanical-chemical transport processes, respectively. Particularly, the coupling phenomena of 
chemical damage, rock dissolution, and solute transport are covered in the simulation. A chemical damage 
variable based on the cohesive bond is proposed to characterize the alteration of mechanical parameters 
caused by local rock dissolution. The influence of the anisotropy ratio of heat conduction and Damkohler 
number (Da) on the THMC coupled acid fracturing process is qualitatively analyzed. Results indicate that 
the dissolved solid is more sensitive to the heat conduction anisotropy in the middle level of Da, where a 
conical area tends to generate upstream of the main fracture. However, for the large Da, it is the diffusioncontrolled process, and it shows uniform dissolution around the injection hole even in large heat conduction 
anisotropy, and little acid reactant can flow into fractures.},
DOI = {10.32604/icces.2023.09168}
}