等温条件下页岩储层视渗透率随压力变化规律研究

发布时间：2018-03-10 12:03

本文选题：页岩视渗透率　切入点：压力　出处：《天然气地球科学》2017年04期 　论文类型：期刊论文

【摘要】：储层中页岩气通常在较大压差和压力梯度条件下流动,流动过程受努森扩散、滑脱效应等多种机理综合作用,流动特征也随流动机制改变而产生相应的变化。实验选取9块页岩岩心,通过开展氮气与氦气的页岩流态实验,得到等温条件下一定压力范围内不同流动机制下的页岩视渗透率变化规律。实验结果表明:发生努森扩散的页岩视渗透率可高于常规气测值数十倍以上,低压差或低压力梯度条件下储层因扩散作用增强实际流动能力增加。当压力水平或压力梯度较低时,扩散是传质的重要机制。认识这一特征对于进一步了解页岩气流动规律以及指导提高页岩气产量有着重要意义。
[Abstract]:The shale gas in the reservoir usually flows under the condition of large pressure difference and pressure gradient, and the flow process is affected by various mechanisms, such as Knudsen diffusion, slippage effect and so on. The flow characteristics also changed with the change of flow mechanism. Nine shale cores were selected and the shale flow patterns of nitrogen and helium were tested. The changes of shale apparent permeability under different flow mechanisms under isothermal conditions are obtained. The experimental results show that the apparent permeability of shale with Knudsen diffusion can be several tens of times higher than that of conventional gas measurements. Under the condition of low pressure difference or low pressure gradient, the actual flow capacity of reservoir is enhanced by diffusion. When the pressure level or pressure gradient is low, Diffusion is an important mechanism of mass transfer, and it is important to understand the characteristics of shale gas flow and to guide the improvement of shale gas production.
【作者单位】：中国科学院渗流流体力学研究所;中国石油勘探开发研究院廊坊分院;
【基金】：国家科技重大专项“页岩气开发机理及技术政策研究”(编号:2011ZX05018-005) 国家重点基础研究发展计划(“973”)“中国南方海相页岩气高效开发的基础研究”(编号:2013CB228000)联合资助
【分类号】：TE311

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