Geomechanics and Engineering

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Geomechanical study of well stability in high-pressure, high-temperature conditions

  • Moradi, Seyyed Shahab Tabatabaee (Well Drilling Department, Saint-Petersburg Mining University) ;
  • Nikolaev, Nikolay I. (Well Drilling Department, Saint-Petersburg Mining University) ;
  • Chudinova, Inna V. (Well Drilling Department, Saint-Petersburg Mining University) ;
  • Martel, Aleksander S. (Well Drilling Department, Saint-Petersburg Mining University)
  • Received : 2017.03.06
  • Accepted : 2018.05.12
  • Published : 2018.10.30
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Abstract

Worldwide growth in hydrocarbon and energy demand is driving the oil and gas companies to drill more wells in complex situations such as areas with high-pressure, high-temperature conditions. As a result, in recent years the number of wells in these conditions have been increased significantly. Wellbore instability is one of the main issues during the drilling operation especially for directional and horizontal wells. Many researchers have studied the wellbore stability in complex situations and developed mathematical models to mitigate the instability problems before drilling operation. In this work, a fully coupled thermoporoelastic model is developed to study the well stability in high-pressure, high-temperature conditions. The results show that the performance of the model is highly dependent on the truly evaluated rock mechanical properties. It is noted that the rock mechanical properties should be evaluated at elevated pressures and temperatures. However, in many works, this is skipped and the mechanical properties, which are evaluated at room conditions, are entered into the model. Therefore, an accurate stability analysis of high-pressure, high-temperature wells is achieved by measuring the rock mechanical properties at elevated pressures and temperatures, as the difference between the model outputs is significant.

Keywords

References

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