Characterizing Drainage Multiphase Flow in Heterogeneous Sandstones
Characterizing Drainage Multiphase Flow in Heterogeneous Sandstones
复制标题
DOI：
10.1029/2017wr022282
复制
发表时间：
2018-04-01
影响因子：
5.4
通讯作者：
Krevor, Samuel
中科院分区：
文献类型：
--
作者：
Jackson, Samuel J.;Agada, Simeon;Krevor, Samuel
在这项工作中，我们利用丰富的实验数据集和mm-m尺度的数值模拟分析了非均质岩石岩心的排水多相流特性。在常规多相流特性的基础上，结合实验观测和数值标定，对三维亚米尺度毛管压力非均质性进行表征，建立岩心三维数值模型。通过准确预测实验测量的N2DI水和CO(2)盐水体系在两种不同砂岩岩心中不同分馏流动形式和总流量的相对渗透率，评估了数值模型的独特性和预测能力。利用数值模型推导等效相对渗透率，等效相对渗透率是考虑亚米尺度毛细管压力影响的放大函数。这些函数是通过毛细管数获得的，这些毛细管数跨越四个数量级，代表了在地下二氧化碳注入中发生的流动状态的范围。去除实验边界伪影可以推导出具有连续地下特征的等效函数。我们还演示了如何重新定位和重组非均质性，以有效地估计与原始岩心样品不同的岩石方向的流动特性。这一分析表明，如何结合岩石样品的实验和数值表征来推导非均质岩石的等效流动特性。
In this work, we analyze the characterization of drainage multiphase flow properties on heterogeneous rock cores using a rich experimental data set and mm-m scale numerical simulations. Along with routine multiphase flow properties, 3-D submeter scale capillary pressure heterogeneity is characterized by combining experimental observations and numerical calibration, resulting in a 3-D numerical model of the rock core. The uniqueness and predictive capability of the numerical models are evaluated by accurately predicting the experimentally measured relative permeability of N2DI water and CO(2)brine systems in two distinct sandstone rock cores across multiple fractional flow regimes and total flow rates. The numerical models are used to derive equivalent relative permeabilities, which are upscaled functions incorporating the effects of submeter scale capillary pressure. The functions are obtained across capillary numbers which span four orders of magnitude, representative of the range of flow regimes that occur in subsurface CO2 injection. Removal of experimental boundary artifacts allows the derivation of equivalent functions which are characteristic of the continuous subsurface. We also demonstrate how heterogeneities can be reorientated and restructured to efficiently estimate flow properties in rock orientations differing from the original core sample. This analysis shows how combined experimental and numerical characterization of rock samples can be used to derive equivalent flow properties from heterogeneous rocks.