Geomechanics and Engineering

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A fully coupled thermo-poroelastoplasticity analysis of wellbore stability

  • Zhu, Xiaohua (School of Mechatronic Engineering, Southwest Petroleum University) ;
  • Liu, Weiji (School of Mechatronic Engineering, Southwest Petroleum University) ;
  • Zheng, Hualin (School of Mechatronic Engineering, Southwest Petroleum University)
  • Received : 2015.04.21
  • Accepted : 2016.01.07
  • Published : 2016.04.25
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Abstract

Wellbore instability problem is one of the main problems that met frequently during drilling, particularly in high temperature, high pressure (HPHT) formations. There are large amount of researches about wellbore stability in HPHT formations, which based on the thermo-poroelastic theory and some achievements were obtained; however, few studies have investigated on the fully coupled thermo-poroelastoplasticity analysis of wellbore stability, especially the analysis of wellbore stability while the filter cake formed. Therefore, it is very necessary to do some work. In this paper, the three-dimensional wellbore stability model which overall considering the effects of fully coupled thermo-poroelastoplasticity and filter cake is established based on the finite element method and Drucker-Prager failure criterion. The distribution of pore pressure, wellbore stress and plastic deformation under the conditions of different mud pressures, times and temperatures have been discussed. The results obtained in this paper can offer a great help on understanding the distribution of pore pressure and wellbore stress of wellbore in the HPHT formation for drilling engineers.

Keywords

Acknowledgement

Supported by : Natural Science Fund

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