{"title":"Numerical Modelling of Crack Initiation around a Wellbore Due to Explosion","authors":"Meysam Lak, Mohammad Fatehi Marji, Alireza Yarahamdi Bafghi, Abolfazl Abdollahipour","volume":138,"journal":"International Journal of Geological and Environmental Engineering","pagesStart":420,"pagesEnd":424,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10009112","abstract":"
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.<\/p>\r\n","references":"[1]\tB. Guo, J. Shan, and Y. Feng, \u201cProductivity of blast-fractured wells in liquid-rich shale gas formations,\u201d Journal of Natural Gas Science and Engineering, vol. 18, pp. 360-367, 2014.\r\n[2]\tC. W. Brandon, \u201cMethod of explosively fracturing a productive oil and gas formation,\u201d United States Patent, 3,066,733, Dec. 1962.\r\n[3]\tG. R. Dysart, A.M. Spencer, and A.L. Anderson, \u201cBlast-Fracturing,\u201d in spring meeting of the Mid-Continent District, API Division of Production, April 1969.\r\n[4]\tA. M. Spencer, \u201cNew blasting methods improve oil recovery,\u201d American Institute of Mining, Metallurgical, and Petroleum Engineers, SPE 2844, 1970.\r\n[5]\tC. G. Laspe, and L. N. Roberts, \u201cA mathematical analysis of oil and gas well stimulation by explosive fracturing,\u201d American Institute of Mining, Metallurgical, and Petroleum Engineers, SPE 3355, 1971.\r\n[6]\tB. D. Blair, L. M. McKenzie, W. B. Allshouse, and J. L. Adgate, \u201cIs reporting \u201csignificant damage\u201d transparent? Assessing fire and explosion risk at oil and gas operations in the United States,\u201d Energy Research & Social Science, submitted for publication, vol. 29, pp. 36-43, 2017.\r\n[7]\tA. Rogala, J. Krzisiek, M. Bernaciak, and J. Hupka, \u201cNon-aqueous fracturing technologies for shale gas recovery\u201d, Physicochemical Problems of Mineral Processing, vol. 49, no. 1, pp. 313-322, 2013.\r\n[8]\tJ. Shan, \u201cA theoretical investigation of radial lateral wells with shockwave completion in shale gas reservoirs,\u201d University of Louisiana at Lafayette, MSc thesis, 2014.\r\n[9]\tJ. Li, L. Cao, B. Guo, and X. Zhang, \u201cPrediction of productivity of high energy gas-fractured oil wells,\u201d Journal of Petroleum Science and Engineering, doi: 10.1016\/j.petrol.2017.10.071, 2017.\r\n[10]\tH. Hosseini Nasab, and M. Fatehi Marji, \u201cA semi-infinite higher order displacement discontinuity method and its application to the quasi-static analysis of radial cracks produced by blasting,\u201d Journal of Mechanics of Material and Structures, vol. 2, no. 3, pp. 439-458, 2007.\r\n[11]\t\tH. P. Rossmanith, Rock fracture mechanics. Springer, New York, 1983.\r\n[12]\tB. N. Whittaker, R.N. Singh, and G. Sun, Rock fracture mechanics: principles, design and applications. Elsevier, Amsterdam, 1992.\r\n[13]\tM. H. Aliabadi, Fracture of rocks. Computational Mechanics Publications, Southampton, 1998.\r\n[14]\tM. M. Dehghan Banadaki, \u201cStress-wave induced fracture in rock due to explosive action,\u201d University of Toronto, PhD thesis, 2010.\r\n[15]\tM. M. Dehghan Banadaki, and B. Mohanty, \u201cNumerical simulation of stress wave induced fractures in rock,\u201d International Journal of Impact Engineering, vol. 40-41, pp. 16-25, 2012.\r\n[16]\tG. W. Ma, and X.M. An, \u201cNumerical simulation of blasting-induced rock fractures,\u201d International Journal of Rock Mechanics and Mining Sciences, vol. 45, pp. 966-975, 2008.\r\n[17]\tZ. L. Wang, and H. Konietzky, \u201cModelling of blast-induced fractures in jointed rock masses,\u201d Engineering Fracture Mechanics, vol. 76, pp. 1945-1955, 2009.\r\n[18]\tT. Jian-sheng, and Q. Fan-fei, \u201cModel experiment of rock blasting with single borehole and double free-surface,\u201d Mining Science and Technology, vol. 19, pp. 395-398, 2009.\r\n[19]\tM. Bendezu, C. Romanel, and D. Roehl, \u201cFinite element analysis of blast-induced fracture propagation in hard rocks,\u201d Computers and Structures, vol. 182, pp. 1-13, 2017.\r\n[20]\tX. P. Li, J. H. Huang, Y. Luo, and P. P. Chen, \u201cA study of smooth wall blasting fracture mechanisms using the Timing Sequence Control Method,\u201d International Journal of Rock Mechanics and Mining Sciences, vol. 92, pp. 1-8, 2017.\r\n[21]\tA. Abdollahipour, M. Fatehi Marji, A. Yarahmadi Bafghi, and J. Gholamnejad, \u201cSimulating the propagation of hydraulic fractures from a circular wellbore using the Displacement Discontinuity Method,\u201d International Journal of Rock Mechanics and Mining Sciences, vol. 80, pp. 281-291, 2015.\r\n[22]\tItasca Consulting Group Inc., User\u2019s manual of FLAC Version 8.0. Minneapolis, Minnesota, 2016.\r\n[23]\tM. Fatehi Marji, \u201cModeling of cracks in rock fragmentation with a higher order displacement discontinuity method,\u201d Middle East Technical University (METU), PhD thesis, 1997.\r\n[24]\tM. Lak, A. Baghbanan, and H. Hashemolhoseini, \u201cEffect of seismic waves on the hydro-mechanical properties of fractured rock masses,\u201d Earthquake Engineering and Engineering Vibration, vol. 16, no. 3, pp. 525-536, 2017.\r\n[25]\tC. Lopez Jimeno, E. Lopez Jimeno, and F. J. Carcedo, Drilling and Blasting of Rocks, Balkema, Rotterdam, 1995.\r\n[26]\tW. A. Hustrulid, and J. Johnson, \u201cA Gas Pressure-based Drift Round Blast Design Methodology,\u201d in 5th International Conference and Exhibition on Mass Mining, Sweden, 2008.\r\n[27]\tC. H. Dowding, and C. T. Aimone, \u201cMultiple blast-hole stresses and measured fragmentation,\u201d Rock Mechanics and Rock Engineering, vol. 18, pp. 17-36, 1985.\r\n[28]\tS. H. Cho, and K. Kaneko, \u201cInfluence of the applied pressure waveform on the dynamic fracture processes in rock,\u201d International Journal of Rock Mechanics and Mining Sciences, vol. 41, pp. 771-784, 2004.\r\n[29]\tL. Chun-rui, K. Li-jun, Q. Qing-xing, M. De-bing, L. Quan-ming, and X. Gang, \u201cThe numerical analysis of borehole blasting and application in coal mine roof-weaken,\u201d Procedia Earth and Planetary Science, vol. 1, pp. 451-459, 2009.\r\n[30]\tW. I. Duvall, \u201cStrain-wave shapes in rock near explosions,\u201d Geophysics, vol. 18, pp. 310-323, 1953.\r\n[31]\tB. H. G. Brady, and E. T. Brown, Rock Mechanics for underground mining, 3rd Edition, Springer, 2005.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 138, 2018"}