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对于渗透率低于10~(-17)m~2的低渗透率岩心,传统的常规渗透率测试方法存在有一定的局限性。瞬态压力脉冲衰减法是多种低渗透率测量方法中成本低,操作简便和应用最为广泛的方法。本文介绍了该方法的原理、理论成果以及三个主要不同模型的计算结果比较分析。结果表明,所有模型计算得到的结果同美国岩心公司的气体渗透率测试仪对比结果符合良好。在不考虑气体吸附效应时,Jones模型和API模型准确性高;在考虑气体吸附效应的情况时,应使用CUI模型进行计算,并需要注意考虑气体吸附效应大小的参数的选值。
For low permeability cores with permeability less than 10 ~ (-17) m ~ 2, the traditional method of permeability testing has some limitations. The transient pressure pulse decay method is a low cost, easy to operate and most widely used method for a variety of low permeability measurement methods. This paper introduces the principle of the method, the theoretical results and the comparative analysis of the calculation results of three major different models. The results show that the results calculated by all the models are in good agreement with the gas permeability tester from the American core company. The Jones model and the API model are of high accuracy without considering the gas adsorption effect. When considering the gas adsorption effect, the CUI model should be used for the calculation, and the parameter selection considering the gas adsorption effect should be taken into consideration.