Hydraulic fracturing of rocks boosts the production rate by increasing the fracture-face surface area through the use of a pressurized liquid. Complex stress distribution and magnitude are the main factors that hinder the use of information gathered from in situ hydraulic fracturing in other locations. Laboratory tests are a good method for precisely determining the characteristics of these processes. One of the most important parameters is breakdown pressure, defined as the wellbore pressure necessary to induce a hydraulic fracture. Therefore, the main purpose of this investigation is to verify fracture resistance of rock samples fractured with the assistance of the most popular industry fluids. The experiments were carried out using a stand designed specifically for laboratory hydraulic fracturing. Repeatable results with a relative error within the range of 6-11% prove that the experimental methodology was correct. Moreover, the obtained results show that fracturing pressure depends significantly on fluid type. In the case of a water test, the fracturing pressure was 7.1±0.4MPa. A similar result was achieved for slickwater, 7.5±0.7MPa; however, a much lower value (4.7±0.5MPa) was registered in the case of carbon dioxide.
1. N.R. Tschirhart, “The evaluation of waterfrac technology in low-permeability gas sands in the East Texas basin”, Texas A&M University, 2005.
2. M.K. Hubbert, D.G. Willis, “Mechanics of hydraulic fracturing. Transactions of American Institute of Mining Engineering” 210: 153−168, 1957.
3. L.O. Frash, “Laboratory-scale Study of Hydraulic Fracturing in Heterogeneous Media for Enhanced Geothermal Systems and General Well Stimulation”, Colorado School of Mines, 2014.
4. I. Matsunaga, H. Kobayashi, S. Sasaki, T. Ishida, „Studying hydraulic fracturing mechanism by laboratory experiments with acoustic emission monitoring”, Int. ,I. Rock Mech. Min. Sci., 30, 7, 909-912, 1993.
5. M.D. Zoback, “Reservoir Geomechanics”, Cambridge University Press, USA, 2007.
6. B.C. Haimson, C. Fairhurst, “Initiation and extension of hydraulic fractures in rocks”, Society of Petroleum Engineering Journal 7: 310−318, 1967.
7. P. Kędzierski, T. Niezgoda, G. Sławiński, “Development of Stand for Rock Material Fracturing in Laboratory Conditions”, Sol. St. Phen., 94-97, 2015.
8. T. Ishida, K. Aoyagi, T. Niwa, Y. Chen, S. Murata, Q. Chen, Y. Nakayama, “Acoustic emission monitoring of hydraulic fracturing laboratory experiment with supercritical and liquid CO2”, Geophys. Res. Lett., 39 (16), 2012
9. Y.Sun, “Impact of slickwater fracturing fluid compositions on the petrophysical properties of shale and tightsand”, PHD thesis, Missouri University Of Science And Technology, 2014.
10. H. Xie, J. Pei, J. Zuo, R. Zhang, “Investigation of mechanical properties of fractured marbles by uniaxial compression tests”, J. Rock Mech. Geotech. Eng., 3 (4), 302-313, 2011.
11. D. G. Prince, “Engineering Geology: Principles and Practice”, Springer-Verlag, United Kingdom, 2009.