Volume 46 Issue 4
Jul.  2024
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XU Ke, JU Wei, ZHANG Hui, LIANG Yan, YIN Guoqing, WANG Zhimin, XU Haoran, ZHANG Wei, LIANG Jingrui. Factors affecting the mechanical properties of tight sandstone and their patterns of variation in Cretaceous Bashijiqike Formation of Kuqa Depression in Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 823-832. doi: 10.11781/sysydz202404823
Citation: XU Ke, JU Wei, ZHANG Hui, LIANG Yan, YIN Guoqing, WANG Zhimin, XU Haoran, ZHANG Wei, LIANG Jingrui. Factors affecting the mechanical properties of tight sandstone and their patterns of variation in Cretaceous Bashijiqike Formation of Kuqa Depression in Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 823-832. doi: 10.11781/sysydz202404823

Factors affecting the mechanical properties of tight sandstone and their patterns of variation in Cretaceous Bashijiqike Formation of Kuqa Depression in Tarim Basin

doi: 10.11781/sysydz202404823
  • Received Date: 2023-08-26
  • Rev Recd Date: 2024-04-10
  • Publish Date: 2024-07-28
  • To clarify the mechanical characteristics of tight sandstone in the Cretaceous Bashijiqike Formation of Kuqa Depression in Tarim Basin, and address field issues in deep and ultra-deep oil and gas exploration and development, triaxial compression experiments were used to quantitatively study the patterns of changes in rock mechanical properties influenced by confining pressure, fluid, and loading rate, with a preliminary analysis of their causes. The results showed that the maximum principal stress difference and elastic modulus of the sandstone samples increased significantly with confining pressure. The micro-reason was that the increase in confining pressure reduced the distance between particles inside the rock, enhancing the rock's cohesion and making particle dispersion less likely. Sandstone samples exhibited a progression from brittleness under low confining pressure to brittle-ductile transformation, and to ductile deformation under high confining pressure. Compared with dry sandstone samples, the reduction in the elastic modulus of samples soaked in pure water, 150 g/L solution, 250 g/L solution, and 350 g/L solution were 67.71%, 61.45%, 64.69%, and 57.32%, respectively, with pure water soaking causing the greatest reduction. Increasing fluid salinity could mitigate the weakening trend in rock mechanical parameters. Crystallization on crystal surfaces and changes in the electric double layer thickness were important controlling factors for these patterns. At lower loading rates, the values for maximum principal stress difference, elastic modulus, and Poisson's ratio of the sandstone samples were smaller, but they increased faster with increasing loading rates. When the loading rate reached a certain critical value (around 0.05 mm/min in this experiment), the rate of increase in rock mechanical parameters slowed down.

     

  • All authors disclose no relevant conflict of interests.
    The manuscript was drafted and revised by XU Ke. The study was designed by JU Wei. The experimental operation was completed by ZHANG Hui. The data analysis was completed by LIANG Yan, ZHANG Wei and LIANG Jinggui. The diagrams were drawn by WANG Zhiming and XU Hairan. YIN Guoqing proofread the manuscript. All authors have read the last version of the paper and consented to its submission.
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