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首页> 外文期刊>Journal of natural gas science and engineering >An optimized transient technique and flow modeling for laboratory permeability measurements of unconventional gas reservoirs with tight structure
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An optimized transient technique and flow modeling for laboratory permeability measurements of unconventional gas reservoirs with tight structure

机译：一种优化的瞬态技术和流动模型，具有紧密结构的无传统气体储层的实验室渗透测量

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摘要

Considering the significance of pressure-dependent-permeability in characterizing fluid flow and production from gas reservoirs and the inaccuracy of the conventional transient technique in laboratory permeability measurements of core samples from unconventional reservoirs with tight structure and strong sorption potential, the conventional transient technique is optimized by using two equal-sized gas reservoirs mounted in the up and downstream sides of the experimental setup and creating same magnitude of pressure pulses in each reservoir concurrently. Applicability of the optimized transient technique is examined through both numerical simulation and laboratory tests. A mathematical model is firstly developed to numerically investigate fluid flow behavior in time and space domain. The results from numerical simulation showed that the optimized technique can greatly improve the efficiency and accuracy of the measurement, because a steady flow state as a function of time can be achieved much faster in comparison with the conventional transient technique when the same magnitude of initial pressure difference is established between the two ends of the sample. Given the difference in experimental design and procedures between the conventional and the optimized technique, it is questionable whether currently used analytical solutions developed for the conventional technique for permeability calculation can be applied for the optimized technique. Therefore, an analytical solution, corresponding to the optimized transient technique, has been then theoretically derived. It is finally experimentally verified that accurate permeability results can be obtained based on late-time pressure responses by the derived analytical solution. The optimized experimental method is capable of extending the application of the transient technique into permeability measurements of rocks with tight structure and strong gas sorption potential, providing a more reliable approach for laboratory permeability tests. (C) 2017 Elsevier B.V. All rights reserved.
机译：考虑到压力依赖性渗透性在表征流体流动和生产中的渗透性和常规瞬态技术的不准确性在实验室渗透性测量中，从具有紧密结构和强烈的吸附潜力的核心样本中的核心样本中的核心样本中的不准确性，传统的瞬态技术进行了优化通过使用安装在实验设置的上下游侧和下游侧面的两个相等的气体储层，并同时在每个储层中产生相同的压力脉冲大小。通过数值模拟和实验室测试检查优化的瞬态技术的适用性。首先开发了数学模型以在时间和空间域中进行数字研究流体流动行为。数值模拟结果表明，优化技术可以大大提高测量的效率和准确性，因为与常规瞬态技术相同的初始压力时，可以实现稳定的流量状态。与初始压力相同的常规瞬态技术在样品的两端之间建立差异。鉴于常规和优化技术之间的实验设计和程序的差异，可以应用于常规技术开发的用于渗透性计算的现有分析解决方案，以用于优化技术。因此，在理论上已经衍生了对应于优化的瞬态技术的分析解决方案。最后通过通过衍生的分析解决方案基于衍生的分析解决方案来获得准确的渗透性结果，可以获得准确的渗透率。优化的实验方法能够将瞬态技术应用于具有紧密结构和强气吸收势的岩石渗透率测量的应用，提供更可靠的实验室渗透性测试方法。 （c）2017 Elsevier B.v.保留所有权利。

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