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<p>During deep shale oil and gas exploitation and development, wellbore instability is a big challenge and thermo-poroelastic wellbore stability analysis is a powerful tool to obtain the safe drilling mud density window. XRD results show that shale in the three layers of Puguang gas reservoir contained maximumly 35.5% of clay minerals and the main type of minerals are chlorite, illite and interlayered illite with montmorillonite. In the thin-section electron microscopy pictures, beddings can be observed in sample from A layer. Thermal conductivity was tested with laser flash method, and it ranges from 2.01 to 3.50 W/m·K for shale in the three layers at formation temperature. Linear thermal expansion coefficient changes from 5.62·10<sup>-6</sup> to 8.09·10<sup>-6</sup> K<sup>-1</sup>. At higher temperatures, thermal conductivity will reduce while the thermal conductivity increases gradually first and at temperature exceeding 500°C, rapid increase occurs. Among three layers, wellbore in layer B has the highest collapse pressure and the narrowest window, which is 1.57-1.83 g/cm<sup>3</sup>. When the wellbore cools down by 20°C, it changes to be 1.56-1.80 g/cm<sup>3</sup>.Cooling can help reduce the collapse pressure and is beneficial for wellbore stability.</p>

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Experimental Investigation on Shale Thermal Properties and Thermo-Poroelastic Analysis of Wellbore Stability in Shale Formation

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Ruiqiang Dong,
  • Guorui Ma,
  • Yufen Ma

摘要

During deep shale oil and gas exploitation and development, wellbore instability is a big challenge and thermo-poroelastic wellbore stability analysis is a powerful tool to obtain the safe drilling mud density window. XRD results show that shale in the three layers of Puguang gas reservoir contained maximumly 35.5% of clay minerals and the main type of minerals are chlorite, illite and interlayered illite with montmorillonite. In the thin-section electron microscopy pictures, beddings can be observed in sample from A layer. Thermal conductivity was tested with laser flash method, and it ranges from 2.01 to 3.50 W/m·K for shale in the three layers at formation temperature. Linear thermal expansion coefficient changes from 5.62·10-6 to 8.09·10-6 K-1. At higher temperatures, thermal conductivity will reduce while the thermal conductivity increases gradually first and at temperature exceeding 500°C, rapid increase occurs. Among three layers, wellbore in layer B has the highest collapse pressure and the narrowest window, which is 1.57-1.83 g/cm3. When the wellbore cools down by 20°C, it changes to be 1.56-1.80 g/cm3.Cooling can help reduce the collapse pressure and is beneficial for wellbore stability.