Numerical Modelling of Crack Initiation around a Wellbore Due to Explosion
A wellbore is a hole that is drilled to aid in the exploration and recovery of natural resources including oil and gas. Occasionally, in order to increase productivity index and porosity of the wellbore and reservoir, the well stimulation methods have been used. Hydraulic fracturing is one of these methods. Moreover, several explosions at the end of the well can stimulate the reservoir and create fractures around it. In this study, crack initiation in rock around the wellbore has been numerically modeled due to explosion. One, two, three, and four pairs of explosion have been set at the end of the wellbore on its wall. After each stage of the explosion, results have been presented and discussed. Results show that this method can initiate and probably propagate several fractures around the wellbore.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1317082Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 529
 B. Guo, J. Shan, and Y. Feng, “Productivity of blast-fractured wells in liquid-rich shale gas formations,” Journal of Natural Gas Science and Engineering, vol. 18, pp. 360-367, 2014.
 C. W. Brandon, “Method of explosively fracturing a productive oil and gas formation,” United States Patent, 3,066,733, Dec. 1962.
 G. R. Dysart, A.M. Spencer, and A.L. Anderson, “Blast-Fracturing,” in spring meeting of the Mid-Continent District, API Division of Production, April 1969.
 A. M. Spencer, “New blasting methods improve oil recovery,” American Institute of Mining, Metallurgical, and Petroleum Engineers, SPE 2844, 1970.
 C. G. Laspe, and L. N. Roberts, “A mathematical analysis of oil and gas well stimulation by explosive fracturing,” American Institute of Mining, Metallurgical, and Petroleum Engineers, SPE 3355, 1971.
 B. D. Blair, L. M. McKenzie, W. B. Allshouse, and J. L. Adgate, “Is reporting “significant damage” transparent? Assessing fire and explosion risk at oil and gas operations in the United States,” Energy Research & Social Science, submitted for publication, vol. 29, pp. 36-43, 2017.
 A. Rogala, J. Krzisiek, M. Bernaciak, and J. Hupka, “Non-aqueous fracturing technologies for shale gas recovery”, Physicochemical Problems of Mineral Processing, vol. 49, no. 1, pp. 313-322, 2013.
 J. Shan, “A theoretical investigation of radial lateral wells with shockwave completion in shale gas reservoirs,” University of Louisiana at Lafayette, MSc thesis, 2014.
 J. Li, L. Cao, B. Guo, and X. Zhang, “Prediction of productivity of high energy gas-fractured oil wells,” Journal of Petroleum Science and Engineering, doi: 10.1016/j.petrol.2017.10.071, 2017.
 H. Hosseini Nasab, and M. Fatehi Marji, “A semi-infinite higher order displacement discontinuity method and its application to the quasi-static analysis of radial cracks produced by blasting,” Journal of Mechanics of Material and Structures, vol. 2, no. 3, pp. 439-458, 2007.
 H. P. Rossmanith, Rock fracture mechanics. Springer, New York, 1983.
 B. N. Whittaker, R.N. Singh, and G. Sun, Rock fracture mechanics: principles, design and applications. Elsevier, Amsterdam, 1992.
 M. H. Aliabadi, Fracture of rocks. Computational Mechanics Publications, Southampton, 1998.
 M. M. Dehghan Banadaki, “Stress-wave induced fracture in rock due to explosive action,” University of Toronto, PhD thesis, 2010.
 M. M. Dehghan Banadaki, and B. Mohanty, “Numerical simulation of stress wave induced fractures in rock,” International Journal of Impact Engineering, vol. 40-41, pp. 16-25, 2012.
 G. W. Ma, and X.M. An, “Numerical simulation of blasting-induced rock fractures,” International Journal of Rock Mechanics and Mining Sciences, vol. 45, pp. 966-975, 2008.
 Z. L. Wang, and H. Konietzky, “Modelling of blast-induced fractures in jointed rock masses,” Engineering Fracture Mechanics, vol. 76, pp. 1945-1955, 2009.
 T. Jian-sheng, and Q. Fan-fei, “Model experiment of rock blasting with single borehole and double free-surface,” Mining Science and Technology, vol. 19, pp. 395-398, 2009.
 M. Bendezu, C. Romanel, and D. Roehl, “Finite element analysis of blast-induced fracture propagation in hard rocks,” Computers and Structures, vol. 182, pp. 1-13, 2017.
 X. P. Li, J. H. Huang, Y. Luo, and P. P. Chen, “A study of smooth wall blasting fracture mechanisms using the Timing Sequence Control Method,” International Journal of Rock Mechanics and Mining Sciences, vol. 92, pp. 1-8, 2017.
 A. Abdollahipour, M. Fatehi Marji, A. Yarahmadi Bafghi, and J. Gholamnejad, “Simulating the propagation of hydraulic fractures from a circular wellbore using the Displacement Discontinuity Method,” International Journal of Rock Mechanics and Mining Sciences, vol. 80, pp. 281-291, 2015.
 Itasca Consulting Group Inc., User’s manual of FLAC Version 8.0. Minneapolis, Minnesota, 2016.
 M. Fatehi Marji, “Modeling of cracks in rock fragmentation with a higher order displacement discontinuity method,” Middle East Technical University (METU), PhD thesis, 1997.
 M. Lak, A. Baghbanan, and H. Hashemolhoseini, “Effect of seismic waves on the hydro-mechanical properties of fractured rock masses,” Earthquake Engineering and Engineering Vibration, vol. 16, no. 3, pp. 525-536, 2017.
 C. Lopez Jimeno, E. Lopez Jimeno, and F. J. Carcedo, Drilling and Blasting of Rocks, Balkema, Rotterdam, 1995.
 W. A. Hustrulid, and J. Johnson, “A Gas Pressure-based Drift Round Blast Design Methodology,” in 5th International Conference and Exhibition on Mass Mining, Sweden, 2008.
 C. H. Dowding, and C. T. Aimone, “Multiple blast-hole stresses and measured fragmentation,” Rock Mechanics and Rock Engineering, vol. 18, pp. 17-36, 1985.
 S. H. Cho, and K. Kaneko, “Influence of the applied pressure waveform on the dynamic fracture processes in rock,” International Journal of Rock Mechanics and Mining Sciences, vol. 41, pp. 771-784, 2004.
 L. Chun-rui, K. Li-jun, Q. Qing-xing, M. De-bing, L. Quan-ming, and X. Gang, “The numerical analysis of borehole blasting and application in coal mine roof-weaken,” Procedia Earth and Planetary Science, vol. 1, pp. 451-459, 2009.
 W. I. Duvall, “Strain-wave shapes in rock near explosions,” Geophysics, vol. 18, pp. 310-323, 1953.
 B. H. G. Brady, and E. T. Brown, Rock Mechanics for underground mining, 3rd Edition, Springer, 2005.