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http://dx.doi.org/10.7474/TUS.2021.31.1.041

Experimental Study on Fracture Pressure, Permeability Enhancement and Fracture Propagation using Different Fracture Fluids  

Choi, JunHyung (Korea Institute of Geoscience and Mineral Resources Post Doc. Oil & Gas Research Center)
Lee, Hyun Suk (Korea Institute of Geoscience and Mineral Resources Post Doc. Oil & Gas Research Center)
Kim, Do Young (Department of Energy and Mineral Resources Engineering, Dong-A University)
Nam, Jung Hun (Department of Energy and Mineral Resources Engineering, Dong-A University)
Lee, Dae Sung (Department of Energy and Mineral Resources Engineering, Dong-A University)
Publication Information
Tunnel and Underground Space / v.31, no.1, 2021 , pp. 41-51 More about this Journal
Abstract
The hydraulic fracturing developed to improve permeability of tight reservoir is one of key stimulation technologies for developing unconventional resources such as shale gas and deep geothermal energy. The experimental study was conducted to improve disadvantage of hydraulic fracturing which has simple fracture pattern and poor fracturing efficiency. The fracturing experiments was conducted for tight rock using various fracturing fluids, water, N2, and CO2 and the created fracture pattern and fracturing efficiency was analyzed depending on fracturing fluids. The borehole pressure increased rapidly and then made fractures for hydraulic fracturing with constant injection rate, however, gas fracturing shows slowly increased pressure and less fracture pressure. The 3D tomography technic was used to generate images of induced fracture using hydraulic and gas fracturing. The stimulated reservoir volume (SRV) was estimated increment of 5.71% (water), 12.72% (N2), and 43.82% (CO2) respectively compared to initial pore volume. In addition, permeability measurement was carried out before and after fracturing experiments and the enhanced permeability by gas fracturing showed higher than hydraulic fracturing. The fracture conductivity was measured by increasing confining stress to consider newly creating fracture and closing induced fracture right after fracturing. When the confining stress was increased from 2MPa to 10MPa, the initial permeability was decreased by 89% (N2) and 50% (CO2) respectively. This study shows that the gas fracturing makes more permeability enhancement and less reduction of induced fracture conductivity than hydraulic fracturing.
Keywords
Hydraulic Fracturing; Shale Gas; Fracture Pressure; Permeability; Fracture Conductivity;
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