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阐述了应用气体不稳定流测试岩石渗透率的原理和方法。主要由岩心测量室、气体标准室、计算机采集系统和计算方法及软件等内容构成的该项测试方法具有快速、准确和自动化程度较高等特点。其数学方法是通过对气体质量流量的校正,寻求同时满足Forchheimer方程和质量连续性方程的解,进而计算出岩石的绝对渗透率。实测对比结果表明,该方法是替代传统稳定流方法测定岩石渗透率的一项实用技术。采用该项测试技术还可同时获得滑脱园子、紊流系数等参数。最后,探讨了岩石渗透率与这些参数的关系。
The principle and method of testing rock permeability by using unsteady flow of gas are described. The test method, which is mainly composed of core measurement chamber, gas standard chamber, computer acquisition system, calculation method and software, has the characteristics of fast, accurate and high degree of automation. The mathematical method is to seek the solution of the Forchheimer equation and the mass continuity equation by correcting the gas mass flow, and then calculate the absolute permeability of the rock. The measured results show that this method is a practical alternative to the traditional steady flow method for rock permeability measurement. Using the test technology can also get off the garden, turbulence coefficient and other parameters. Finally, the relationship between rock permeability and these parameters is explored.