مطالعه تاثیر ویسکوزیته سیال و قطر چال بر فشار شکست در روش شکست هیدرولیکی به کمک دستگاه تست سه محوره واقعی
چکیده
یک دستگاه تست سه محوره واقعی که قابلیت انجام آزمایش های شکست هیدرولیکی را در مقیاس آزمایشگاهی داشته باشد توسط نویسندگان در دانشگاه صنعتی شاهرود طراحی و ساخته شد. در راستای بررسی ارتباط فشار شکست با دو پارامتر ویسکوزیته سیال و قطر گمانه، که می توانند نتایج حاصل از روش شکست هیدرولیکی را در مسیر تعیین تنش های برجای زمین تحت تاثیر قرار دهند، آزمایشات شکست هیدرولیکی به کمک این دستگاه انجام شدند. به همین منظور نمونه های بتنی به ابعاد cm3 30*30*30، که در مرکز آن ها سوراخ با قطرهای mm 30، mm 50 و mm 80 ایجاد شده بود، مورد آزمایش قرار گرفتند. نتایج حاصل از این آزمایشات نشان دادند که با افزایش قطر گمانه فشار سیال برای شکست سنگ کاهش می یابد. در قسمت دوم 3 نوع روغن هیدرولیک با ویسکوزیته های متفاوت (H46، H68 و H100) در این مطالعه مورد استفاده قرار گرفتند. نتایج نشان داد که با افزایش ویسکوزیته سیال، فشار شکست کاهش می یابد.
مراجع
Hayashi, Kazuo and Bezalel C. Haimson. "Characteristics of shut-in curves in hydraulic fracturing stress measurements and determination of in situ minimum compressive stress." Journal of Geophysics Research: Solid Earth 96.B11 (1991): 18311-18321.
Montgomery C and Smith M, Hydraulic Fracturing. NSI Technologies, December, 2010.
Manthei, G., J. Eisenblatter and P. Kamlot, Stress Measurements in salt mines using a special hydraulic fracturing borehole tool, Geotechnical Measurements and Modelling, Natau, Fecker & Pimental (eds), ISBN 90 5809 603 3, 2003.
Ito, T., and K. Hayashi. "Physical background to the breakdown pressure in hydraulic fracturing tectonic stress measurements." International journal of rock mechanics and mining sciences & geomechanics abstracts. Vol. 28. No. 4. Pergamon, 1991.
Haimson, Bezalel C., and Zhongliang Zhao. "Effect of borehole size and pressurization rate on hydraulic fracturing breakdown pressure." The 32nd US Symposium on Rock Mechanics (USRMS). American Rock Mechanics Association, 1991.
Ito, Takatoshi. "Effect of pore pressure gradient on fracture initiation in fluid saturated porous media: Rock." Engineering Fracture Mechanics 75.7 (2008): 1753-1762.
Bennour, Z., T. Ishida, Y. Nagaya, Y. Nara, Y. Chen, Q. Chen, Y. Nakayama, K. Sekine, and Y. Nagano. "Fracture development and mechanism in shale cores by viscous oil, water and L-CO 2 injection." In 48th US Rock Mechanics/Geomechanics Symposium. American Rock Mechanics Association, 2014.
Lhomme, T. P., C. J. de Pater, and P. H. Helfferich. "Experimental study of hydraulic fracture initiation in Colton sandstone." SPE/ISRM Rock Mechanics Conference. Society of Petroleum Engineers, 2002.
Detournay, Emmanuel E., and Alex E. Cheng. "Influence of pressurization rate on the magnitude of the breakdown pressure." The 33th US Symposium on Rock Mechanics (USRMS). American Rock Mechanics Association, 1992.
Inui, S., T. Ishida, Y. Nagaya, Y. Nara, Y. Chen, and Q. Chen. "AE monitoring of hydraulic fracturing experiments in granite blocks using supercritical CO2, water and viscous oil." In 48th US Rock Mechanics/Geomechanics Symposium. American Rock Mechanics Association, 2014.
Ishida, Tsuyoshi, Qu Chen, Yoshiaki Mizuta, and Jean-Claude Roegiers. "Influence of fluid viscosity on the hydraulic fracturing mechanism." Journal of energy resources technology 126, no. 3 (2004): 190-200.
Younessi, A., V. Rasouli, and B. Wu. "Experimental sanding analysis: thick walled cylinder versus true triaxial tests." In Proceedings of 2nd southern hemisphere international rock mechanics symposium (SHIRMS), Sun City, South Africa. 2012.
Rasouli, V. "A true triaxial stress cell to simulate deep downhole drilling conditions." SPE News, 2011.
Zhang, Guang-Qing, and Tiegang Fan. "A high-stress tri-axial cell with pore pressure for measuring rock properties and simulating hydraulic fracturing." Measurement 49 (2014): 236-245.
Aoyagi Kazuhei, Ishida Tsuyoshi, Murata Sumihiko, Yamamoto Koji, Sekine Kotaro. "Experiments to investigate effects of the intermediate principal stress on the borehole breakout development." 6th Int. Symp. On In-Situ Rock Stress, 20-22 August 2013, Sendai, Japan, 2013.
Kizaki Akihisa, Tanaka Hiroharu and Sakaguchi Kiyotoshi. "Effects of Pore Water on Hydraulic Fracture Propagation using Super Critical Carbon Dioxide as Fracturing Fluid." 6th Int. Symp. On In-Situ Rock Stress, 20-22 August 2013, Sendai, Japan, 2013.
Haimson Bezalel and Chang Chandong. "A new true triaxial cell for testing mechanical properties of rock, and its use to determine rock strength and deformability of Westerly granite." International Journal of Rock Mechanics and Mining Sciences 37 (2000) 285-296.
Frash, Luke P., Marte Gutierrez, and Jesse Hampton. "True-triaxial apparatus for simulation of hydraulically fractured multi-borehole hot dry rock reservoirs." International Journal of Rock Mechanics and Mining Sciences 70 (2014): 496-506.
Huang, Bingxiang, Changyou Liu, Junhui Fu, and Hui Guan. "Hydraulic fracturing after water pressure control blasting for increased fracturing." International Journal of Rock Mechanics and Mining Sciences 48, no. 6 (2011): 976-983.
Cheon, D. S., S. JEON, C. Park, and C. Ryu. "An experimental study on the brittle failure under true triaxial conditions." Tunnelling and Underground Space Technology 21, no. 3-4 (2006).
Ito, T., Narita, H. "Laboratory study for pore water effect on hydraulically-induced fracture behavior in unconsolidated sands."48th US Rock Mechanics/ Geomechanics Symposium held in Minneapolis, MN, USA, 1-4 June, 2014.
Shirazi, H., Torabi, S.R., Sereshki, F., Mirzaei, H. "Analysis of the effect of interval length on the fracture pressure in the hydraulic fracturing technique." 5th Iranian Rock Mechaincs Conference. 17-18 May 2014, Tarbiat Modares University, Iran.
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