Comparison of Rock Toughness Measurement Methods for Hydraulic Fracturing: A Research Note

Year 2023, Volume: 5 Issue: 3, 375 - 380, 31.12.2024

Wang Xiaoming

Abstract

One important rock property is toughness, which is the ability of a rock to resist further deformation or fracturing. Three modes used to quantify this property are: the opening mode (mode I), the shearing mode (mode II), and the tearing mode (mode III). In order to successfully fracture a rock, an estimation of rock toughness must be calculated for the formation. Three tests developed to quench that need are the scratch test, straight-notched Brazilian disc specimen test, and the semicircular bend test. The objective of this paper is to present the procedure, governing equation, and results for each test. Moreover, analysis of the results obtained from each test produced important correlations between rock toughness and shale properties. A comprehensive comparison is conducted on the tests presenting three primary differences, which are convenience, variables, and accuracy. In all three tests, the method used to induce fractures was a common limitation that restricted their applicability. This indicates the need to conduct more study and research in the field of fracture toughness measurement.

Keywords

Rock, Rock Toughness, Scratch Test, Straight-notched Brazilian Test, Semi-circular Bend Test

References

• Abes, A., Irofti, D., Ifrene, G. E., Rasouli, V., Djemai, S., 2021. The Impact of Geometric Attributes of Fractures on Flu-id Flow Characteristics of Reservoir: A Case Study in Alrar Field, Algeria. In 55th US Rock Mechanics/Geomechanics Symposium. OnePetro, Paper Number: ARMA-2021-1803.
• Abid, S.R., Murali, G., Amran, M., Vatin, N., Fediuk, R., Karelina, M., 2021. Evaluation of mode II fracture toughness of hybrid fibrous geopolymer composites. Materials 14 (2), 349.
• Aihar, A., Bouabdallah, N., Ifrene, G., Irofti, D., 2023. Comparing Fishbone Drilling and Hydraulic Fracturing in Ultra-Low Permeability Geothermal Reservoirs. AAPG Rocky Mountain Section Meeting, Bismarck, North Dakota, June 4-6, 2023. https://doi.org/10.1306/80737Aihar2023.
• Akono, A., Kabir, P., 2015. Microscopic fracture characterization of gas shale via scratch testing. Mechanics Research Communications, 66.
• Akono, A., Ulm, F., 2012. Fracture scaling relations for scratch tests of axisymmetric shape, Journal of Mechanics and Physics of Solids 60 (3), 379-390.
• Alagoz, E., Sharma, M.M., 2021. Investigating Shale-Fluid Interactions and Its Effect on Proppant Embedment Using NMR techniques. Paper ARMA 2021-1129, 55th US Rock Mechanics/Geomechanics Symposium held in Houston, Texas, USA, 20-23 June. https://onepetro.org/ARMAUSRMS/proceedings-abstract/ARMA21/All-ARMA21/ARMA-2021-1129/467923.
• Alagoz, E., Wang, H., Russell, R.T., Sharma, M.M., 2020. New Experimental Methods to Study Proppant Embedment in Shales. Paper ARMA 2020-1933, 54th US Rock Mechanics/Geomechanics Symposium held in Golden, Colorado, USA, 28 June-1 July. https://onepetro.org/ARMAUSRMS/proceedings-abstract/ARMA20/All-ARMA20/ARMA-2020-1933/447713.
• Alagoz, E., Wang, H., Russell, R.T., Sharma, M.M., 2022. New Experimental Methods to Study Proppant Embedment in Shales. Rock Mechanics and Rock Engineering 55, 2571-2580. https://doi.org/10.1007/s00603-021-02646-1.
• Alagoz, E., Yaradilmis, Y., 2023. Evaluation of Resin Coated Proppants: A New Custom Method. International Journal of Earth Sciences Knowledge and Applications 5 (2), 237-243. http://www.ijeska.com/index.php/ijeska/article/view/278.
• Ifrene, G.E., Irofti, D., Khetib, Y., Rasouli, V., 2022. Shear Waves Anisotropy and Image Logs Integration for Im-proved Fracture Characterization. In 56th US Rock Mechanics/Geomechanics Symposium. https://doi.org/10.56952/ARMA-2022-0319.
• Ifrene, G., Irofti, D., Ni, R., Egenhoff, S., Pothana, P., 2023. New Insights in Fracture Porosity Estimation using Machine Learning and Advanced Logging Tools. Fuels 4 (3), 333-353. https://doi.org/10.3390/fuels4030021.
• Imani, D. M., Aliha, M. R. M., Linul, E., Marsavina, L., 2022. A suitable mixed mode I/II test specimen for fracture tough-ness study of polyurethane foam with different cell densities. Theoretical and Applied Fracture Mechanics 117, 103171.
• Irofti, D., Ifrene, G.E., Pu, H., Djemai, S., 2022. A Multiscale Approach to Investigate Hydraulic Attributes of Natural Fracture Networks in Two Tight Sandstone Fields, Ahnet, Algeria. In 56th US Rock Mechanics/Geomechanics Symposium. https://doi.org/10.56952/ARMA-2022-0450.
• Irofti, D., Ifrene, G., Cheddad, F.A., Djemai, S., 2023. Integrating Borehole Imaging and Full Waveform Dipole Sonic Data to Estimate Fracture Porosity in Tight Formations: A Workflow for Accurate Characterization of Natural Fractures. https://doi.org/10.1306/42582Irofti2023.
• Kramarov, V., Parrikar, P.N., Mokhtari, M., 2020. Evaluation of fracture toughness of sandstone and shale using digital image correlation. Rock Mechanics and Rock Engineering 53, 4231-4250.
• Lee, H., Olson, J., Holder, J., Gale, J., Myers, R., 2014. The interaction of propagating opening mode fractures with preexisting discontinuities in shale [Image]. Journal of Geophysics Solid Earth 120 (1), 169-181.
• Mazhnik, E., Oganov, A.R., 2019. A model of hardness and fracture toughness of solids. Journal of Applied Physics 126 (12), 125109.
• Zhao, Y., Zhang, L., Liao, J., Wang, W., Liu, Q., Tang, L., 2020. Experimental study of fracture toughness and subcritical crack growth of three rocks under different environments. International Journal of Geomechanics 20 (8), 04020128.
• Zijian, C., Ulm, Y., Junliang, Y., Yanan, Z., Jingen, D., 2016. Determination of fracture toughness of rocks of a shale gas reservoir using straight-notched Brazilian Disc (SNBD) specimen and well logs. Journal of State Higher Educational Institution 3, 10-15.