Cubical granite specimens were fractured by borehole pressurization of 1 cP water, 80 cP oil and via a urethane sleeve. Viscous oil tends to generate thick and planar cracks with few branches, while water tends to generate thin and wavelike cracks with many secondary branches. While penetrating fluids extended cracks rapidly, pressurization via a urethane sleeve led to stepwise crack extension. Fault-plane solutions of AE (Acoustic Emission) events indicated that shear-type mechanisms were dominant during water injection and sleeve pressurization, whereas tensile-type mechanisms were dominant during oil injection. These results could be helpful in optimizing stimulation treatments in the petroleum industry.
Influence of Fluid Viscosity on the Hydraulic Fracturing Mechanism
Contributed by the Petroleum Division for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received by Petroleum Division November 20, 2002; revised manuscript received February 25, 2004. Associate Editor: T. Yildiz.
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Ishida, T., Chen, Q., Mizuta, Y., and Roegiers, J. (October 19, 2004). "Influence of Fluid Viscosity on the Hydraulic Fracturing Mechanism ." ASME. J. Energy Resour. Technol. September 2004; 126(3): 190–200. https://doi.org/10.1115/1.1791651
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