Finite element analysis of wellbore stability and optimum drilling direction and applying NYZA method for a safe mud weight window

نوع مقاله : مقاله پژوهشی

نویسندگان

Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran

چکیده

Wellbore stability analysis, selecting the optimum drilling direction, and determining the safe and stable mud weight windows are among the major geo-mechanical challenges in the oil and gas industries. In this study, the wellbore stability analysis and the optimal drilling direction have been numerically modelled by finite element method (FEM) considering the importance of wellbore stability and recognizing instabilities using the data of Sivand oil field. The numerical modeling of wells behaviors has been performed in two modes of elastic and elastoplastic deformations using ABAQUS software. The numerical results have been done using the two failure criteria, namely Mohr-Coulomb and Drucker-Prager and compared together, considering the effect of intermediate principal stress, Drucker-Prager failure criterion has been selected as a suitable failure criterion for this study. In addition, the numerical results have shown that the vertical well is the optimal drilling direction. Then, by applying the NYZA method, the safe mud weight window has been determined. The validity of the proposed mud window for a vertical well has been approved by applying the Mohr-Coulomb analytical method. Finally, the safe and stable mud window for the vertical wellbore has been proposed.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Finite element analysis of wellbore stability and optimum drilling direction and applying NYZA method for a safe mud weight window

نویسندگان [English]

  • Mohsen Heydari
  • Mohammad Reza Aghakhani Emamqeysi
  • Manouchehr Sanei
Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
چکیده [English]

Wellbore stability analysis, selecting the optimum drilling direction, and determining the safe and stable mud weight windows are among the major geo-mechanical challenges in the oil and gas industries. In this study, the wellbore stability analysis and the optimal drilling direction have been numerically modelled by finite element method (FEM) considering the importance of wellbore stability and recognizing instabilities using the data of Sivand oil field. The numerical modeling of wells behaviors has been performed in two modes of elastic and elastoplastic deformations using ABAQUS software. The numerical results have been done using the two failure criteria, namely Mohr-Coulomb and Drucker-Prager and compared together, considering the effect of intermediate principal stress, Drucker-Prager failure criterion has been selected as a suitable failure criterion for this study. In addition, the numerical results have shown that the vertical well is the optimal drilling direction. Then, by applying the NYZA method, the safe mud weight window has been determined. The validity of the proposed mud window for a vertical well has been approved by applying the Mohr-Coulomb analytical method. Finally, the safe and stable mud window for the vertical wellbore has been proposed.

کلیدواژه‌ها [English]

  • Finite Element
  • Method
  • ABAQUS
  • Wellbore Stability
  • Drucker-Prager
  • Mohr-Coulomb
  • NYZA
[1] Bradley W. Failure of inclined boreholes. 1979.
[2] Morita N, editor Uncertainty analysis of borehole stability problems. SPE Annual Technical Conference and Exhibition; 1995: Society of Petroleum Engineers.
[3] Zoback MD. Reservoir Geomechanics: Cambridge University Press; 2010
[4] Al-Ajmi AM, Zimmerman RW. A new well path optimization model for increased mechanical borehole stability. Journal of Petroleum Science and Engineering. 2009;69(1-2):53-62.
[5] Li Q, Tang Z. Optimization of borehole trajectory using the initial collapse volume. Journal of Natural Gas Science and Engineering. 2016;29:80-8.
[6] Coelho LC, Soares AC, Ebecken NFF, Alves JLD, Landau L. The impact of constitutive modeling of porous rocks on 2-D wellbore stability analysis. Journal of Petroleum Science and Engineering. 2005;46(1-2):81-100.
[7] Kaarstad E, Aadnoy BS, editors. Optimization of borehole stability using 3-D stress optimization. SPE annual technical conference and exhibition; Society of Petroleum Engineer,2005.
[8] Al-Ajmi AM, Zimmerman RW. Stability analysis of vertical boreholes using the Mogi–Coulomb failure criterion. International Journal of Rock Mechanics and Mining Sciences. 2006;43(8):1200-11.
[9] Sanei, M. 2011.Wellbore stability analysis in the method of under balanced drilling, in: Proceeding of the 8th Iranian Student Conference of Mining Engineering; Tehran, Iran. (In Persian).
[10] Asgari, Ramin, Haydarizadeh, Meamarian. Analysis of wellbore stability and Determination of Mud weight window with NYZA at aSouth oil field. Exploration and production oil and GAS. 2017;1396(146):59-65. (In Persian).
[11] Behnam N, Hosseini M, Shahbazi S. A Criterion for Estimating the Minimum Drilling Mud Pressure to Prevent Shear Failure in Oil Wells. Geotechnical and Geological Engineering. 2020;38(1):227-36. (In Persian).
[12] Garavand, A., Stefanov, Y. P., et al. "Numerical modeling of plastic deformation and failure around a wellbore in compaction and dilation modes." International Journal for Numerical and Analytical Methods in Geomechanics. 2020;44(6):823-50
[13] Khodami, E., Ramezanzadeh, A., et al. "Numerical modeling of oil well integrity with a particular view to cement (case study: Maroon Oilfield in southwest of Iran)." Journal of Petroleum Science and Engineering. 2021;196:107991.
[14] Duran, O., Sanei, M., Devloo, P. Santos, E. 2020. An enhanced sequential fully implicit scheme for reservoir geomechanics. Journal of Computational Geosciences.
[15] Sanei, M., Duran, O., Devloo, P., Santos, E. 2021. Analysis of pore collapse and shear-enhanced compaction in hydrocarbon reservoirs using coupled poro-elastoplasticity and permeability. Arabian Journal of Geosciences.
[16] McLellan, P. J., Wang, Y. "Predicting the effects of pore pressure penetration on the extent of wellbore instability: Application of a versatile poro-elastoplastic model." Rock Mechanics in Petroleum Engineering; 1994. SPE-28053-MS.
[17] Pašić, B., Gaurina-Međimurec, N., et al. "Wellbore instability: Causes and consequences." Rudarsko-Geološko-Naftni Zbornik. 2007;19.
[18] Zang, A., Stephansson, O. "Rock fracture criteria.  Stress Field of the Earth’s Crust: Springer; 2010. p. 66.
[19] Najibi, A. R., Ghafoori, M., et al. "Reservoir geomechanical modeling: In-situ stress, pore pressure, and mud design." Journal of Petroleum Science and Engineering.2017;151:31-9.
[20] Drucker DC, Prager W. Soil mechanics and plastic analysis or limit design. Quarterly of applied mathematics.1952;10(2):157-65.
[21] Mohr O.WelcheUmstände bedingen die Elastizitätsgrenze und den Bruch eines Materials. Zeitschrift des Vereins Deutscher Ingenieure. 1900;46(1524-1530):1572-7.
[22] Coulomb CA. Essai sur une application des regles de maximis et minimis a quelques problemes de statique relatifs a l'architecture (essay on maximums and minimums of rules to some static problems relating to architecture). 1973.
[23] McLellan P, Hawkes C. Borehole Stability Analysis for Underbalanced Drilling. Journal of Canadian Petroleum Technology. 2001;40(05).
[24] Kirsch, C. "Die theorie der elastizitat und die bedurfnisse der festigkeitslehre." Zeitschrift des Vereines Deutscher Ingenieure. 1898.
[25] Logan DL. A First Course in the Finite Element Method: Cengage Learning; 2011.
[26] Manual of Abaqus/CAE Version: 6.14-2, Dassault Systèmes Simulia Corp. 2014.
[27] Fjar E, Holt RM, Raaen AM, Horsrud P. Petroleum Related Rock Mechanics: Elsevier Science; 2008.
[28] Sanei, M., Duran, O., Devloo, P. Santos, E. Evaluation of the impact of strain-dependent permeability on reservoir productivity using iterative coupled reservoir geomechanical modeling, (Geomechanics and Geophysics for Geo-Energy and Geo-Resources), January, 2022.
[29] Hassani Zaveh SR, Ahmadi M, Ghoreishian Amiri SA. An Elastic-Perfect Plastic Constitutive Model Based on Mogi-Coulomb Yield Criterion. Journal of Analytical and Numerical Methods in Mining Engineering. 2018;7(14):51-9. (In Persian).
[30] Wang, J., Weijermars, R. "New Interface for Assessing Wellbore Stability at Critical Mud Pressures and Various Failure Criteria: Including Stress Trajectories and Deviatoric Stress Distributions." Energies. 2019;12(20):4019  .