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中文题名低温处理对Marcellus页岩井下取心样品孔隙度、渗透率和力学特性影响的实验研究
作者Rayan Khalil
作者单位Bob L. Herd Department of Petroleum Engineering, Texas Tech University, Texas, USA
刊名Journal of Natural Gas Science and Engineering
2020
81
摘要
通过注入液氮(LN2)等低温流体,可促进页岩储层中裂缝的形成和扩展,连通天然裂缝网络。本文旨在研究低温处理对Marcellus页岩井下取心样品孔隙度、渗透率和力学特性(杨氏模量、泊松比、脆性、体积压缩系数和无侧限抗压强度)的影响。将从1700米深采集的三个井下岩心样品加热到储层温度(66℃),然后将LN2注入岩心夹持器中,分别加压到1.38MPa、2.76MPa和4.14MPa。在低温处理前后,分别对岩心样品进行CT扫描、孔隙率、渗透率和超声速度测试。测试结果显示,进行低温处理会在所有岩心样品中产生新裂隙。此外,在1.38MPa、2.76MPa和4.14MPa压力下注入液氮,岩心样品的孔隙度分别提高了1.51%、2.49%和5.01%,渗透率分别提高了270%、388%和9482%,这主要是由于岩心样品内部产生了新的裂隙。低温处理产生的裂隙使压缩和剪切速度分别下降了2.11%和0.70%;岩心的动态杨氏模量和泊松比分别下降了2.37%和5.24%;脆性和体积压缩系数分别提高了1.59%和7.05%。在低温处理后,新裂隙导致岩心样品的无侧限抗压强度值介于34.73-2.57MPa之间,显著低于Marcellus页岩岩心样品的典型值(101-170MPa)。综上表明,低温处理技术可以应用于页岩储层,提高渗透率和油气产量。

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