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Hydraulic fracture initiation pressure of anisotropic shale gas reservoirs

  • Zhu, Haiyan (State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University) ;
  • Guo, Jianchun (State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University) ;
  • Zhao, Xing (State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University) ;
  • Lu, Qianli (State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University) ;
  • Luo, Bo (State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University) ;
  • Feng, Yong-Cun (Department of Petroleum and Geosystems Engineering, The University of Texas at Austin)
  • 투고 : 2013.12.12
  • 심사 : 2014.06.25
  • 발행 : 2014.10.25

초록

Shale gas formations exhibit strong mechanical and strength anisotropies. Thus, it is necessary to study the effect of anisotropy on the hydraulic fracture initiation pressure. The calculation model for the in-situ stress of the bedding formation is improved according to the effective stress theory. An analytical model of the stresses around wellbore in shale gas reservoirs, in consideration of stratum dip direction, dip angle, and in-situ stress azimuth, has been built. Besides, this work established a calculation model for the stress around the perforation holes. In combination with the tensile failure criterion, a prediction model for the hydraulic fracture initiation pressure in the shale gas reservoirs is put forward. The error between the prediction result and the measured value for the shale gas reservoir in the southern Sichuan Province is only 3.5%. Specifically, effects of factors including elasticity modulus, Poisson's ratio, in-situ stress ratio, tensile strength, perforation angle (the angle between perforation direction and the maximum principal stress) of anisotropic formations on hydraulic fracture initiation pressure have been investigated. The perforation angle has the largest effect on the fracture initiation pressure, followed by the in-situ stress ratio, ratio of tensile strength to pore pressure, and the anisotropy ratio of elasticity moduli as the last. The effect of the anisotropy ratio of the Poisson's ratio on the fracture initiation pressure can be ignored. This study provides a reference for the hydraulic fracturing design in shale gas wells.

키워드

참고문헌

  1. Aadnoy, B.S. and hogskole, N.t. (1987), Continuum Mechanics Analysis of the Stability of Inclined Boreholes in Anisotropic Rock Formation, Norwegian Institute of Technology.
  2. Amadei, B. (1983), Rock Anisotropy and the Theory of Stress Measurements, Lecture Notes in Engineering, Volume 2, Springer Berlin Heidelberg.
  3. Bowker, K.A. (2003), "Recent developments of the Barnett Shale play, Fort Worth Basin", West Texas Geological Society Bulletin, 42(6), 4-11.
  4. EIA (2011), "Shale gas in the United States: Recent developments and outlook".
  5. Fallahzadeh, S.H., Shadizadeh, S.R., Pourafshary, P. and Zare, M.R. (2010), "Modeling the perforation stress profile for analyzing hydraulic fracture initiation in a cased hole", SPE 136990, The 34th Annual SPE International Conference and Exhibition, Tinapa-Calabar, Nigeria, July-August.
  6. Hossain, M.M., Rahrnan, M.K. and Rahman, S.S. (2000), "Hydraulic fracture initiation and propagation: Roles of wellbore trajectory, perforation and stress regimes", J. Pet. Sci. Eng., 27(3-4), 129-149. https://doi.org/10.1016/S0920-4105(00)00056-5
  7. Huang, R. and Zhuang, J. (1986), "A new prediction model of formation breakdown pressure", Oil Drill. Prod. Tech., 8(3), 1-3.
  8. Jaeger, J.C. and Cook, N.G.W. (2007), Fundamentals of Rock Mechanics, (3rd Edition Ed.), Chapman and Hall, London, UK.
  9. Khan, S., Ansari, S., Han, H. and Khosravi, N. (2011), "Importance of shale anisotropy in estimating in-situ stresses and wellbore stability analysis in Horn River basin", SPE 149433, Canadian Unconventional Resources Conference, Alberta, Canada, November.
  10. Lekhnitskii, S.G. (1981), Theory of Elasticity of an Anisotropic Body, MIR Publishers, Moscow, Russia.
  11. Mathews, L.H., Sehein, G. and Malone, M. (2007), "Stimulation of gas shales: They' re all the same-right", SPE 106070, SPE Hydraulic Fracturing Technology Conference, College Station, TX, USA, January.
  12. Ong, S.H. (1994), "Borehole stability", Ph.D. Thesis, The University of Oklahoma, Oklahoma, OK, USA.
  13. Ong, S.H. and Roegiers, J.C. (1995), "Fracture initiation from inclined wellbores in anisotropic formations", J. Pet. Tech., 48(7), 612-619.
  14. Pariseau, W.G. (1968), "Plasticity theory for anisotropic rocks and soils", The 10th U.S. Symposium on Rock Mechanics (USRMS), Austin, TX, USA, May.
  15. Prioul, R., Karpfinger, F., Deenadayalu, C. and Suarez-Rivera, R. (2011), "Improving fracture initiation predictions on arbitrarily oriented wells in anisotropic shales", Canadian Unconventional Resources Conference, Calgary, AB, Canada, November.
  16. Sayers, C.M. (2005), "Seismic anisotropy of shales", Geophys. Prospect., 53(5), 667-676. https://doi.org/10.1111/j.1365-2478.2005.00495.x
  17. Sinha, B.K., Vissapragada, B., Renlie, L. and Tysse, S. (2006), "Radial profiling of the three formation shear moduli and its application to well completions", Geophys., 71(6), 65-77.
  18. Suarez-Rivera, R., Green, S.J., McLennan, J. and Bai, M. (2006), "Effect of layered heterogeneity on fracture initiation in tight gas shales", SPE 103327, SPE Annual Technical Conference and Exhibition, San Antonio, TX, USA, September.
  19. Suarez-Rivera, R., Deenadayalu, C. and Yang, Y. (2009), "SS: Unlocking the unconventional oil and gas reservoirs: The effect of laminated heterogeneity in wellbore stability and completion of tight gas shale reservoirs", OTC 20269, Offshore Technology Conference, Houston, TX, USA, May.
  20. Thiercelin, M. and Plumb, R. (1994), "A core-based prediction of lithologic stress contrasts in East Texas formations", SPE Formation Eval., 9(4), 251-258. https://doi.org/10.2118/21847-PA
  21. Walsh, J., Sinha, B., Plona, T., Miller, D., Bentley, D. and Ammerman, M. (2007), "Derivation of anisotropy parameters in a shale using borehole sonic data", SEG Technical Program Expanded Abstracts, 1(26), 323-327.
  22. Wang, Y. and Li, Z. (1999), "A study of in-situ stresses in transversely isotropic formations", ACTA PETROL EI SINICA, 20(1), 34-37.
  23. Weng, X. (1993), "Fracture initiation and propagation from deviated wellbores", SPE 26597, The 68th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers, Houston, TX, USA, October.
  24. Yan, C.L., Deng, J.G., Yu, B.H., Tan, Q., Deng, F.C., Zhu, H.Y., Hu, L.B. and Chen, Z.J. (2013), "Research on collapsing pressure of gas shale", Chinese J. Rock Mech. Eng., 32(8), 1595-1602.
  25. Zhu, H.Y., Deng, J.G., Xie, Y.H., Huang, K.W., Zhao, J.Y. and Yu, B.H. (2012), "Rock mechanics characteristic of complex formation and faster drilling techniques in Western South China Sea oilfields", Ocean Eng., 44, 33-45. https://doi.org/10.1016/j.oceaneng.2012.01.031
  26. Zhu, H.Y., Deng, J.G., Chen, Z.J., An, F.C., Liu, S.J., Peng, C.Y., Wen, M. and Dong, G. (2013a), "Perforation optimization of hydraulic fracturing of oil and gas well", Geomech. Eng., Int. J., 5(5), 463-483. https://doi.org/10.12989/gae.2013.5.5.463
  27. Zhu, H.Y., Deng, J.G., Li, S.Y., Chen, Z.R. and Yan, W. (2013b), "Numerical simulation and laboratory experiments of hydraulic fracturing of highly deviated well", Appl. Mech. Mater., 275-277, 278-281. https://doi.org/10.4028/www.scientific.net/AMM.275-277.278

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  14. A novel analytical model of initial fracture pressure for horizontal staged fracturing in fractured reservoir vol.7, pp.6, 2014, https://doi.org/10.1002/ese3.500
  15. A Case Study on the Optimal Design of the Horizontal Wellbore Trajectory for Hydraulic Fracturing in Nong’an Oil Shale vol.13, pp.1, 2014, https://doi.org/10.3390/en13010286
  16. Material constituents and mechanical properties and macro-micro-failure modes of tight gas reservoirs vol.38, pp.6, 2014, https://doi.org/10.1177/0144598720913069