Impact of Three‐Phase Relative Permeability and Hysteresis Models on Forecasts of Storage Associated With CO2‐EOR
Impact of Three‐Phase Relative Permeability and Hysteresis Models on Forecasts of Storage Associated With CO2‐EOR
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DOI：
10.1002/2017wr021273
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发表时间：
2015-12
影响因子：
5.4
通讯作者：
W. Jia;B. McPherson;F. Pan;Z. Dai;N. Moodie;Ting Xiao
中科院分区：
文献类型：
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作者：
W. Jia;B. McPherson;F. Pan;Z. Dai;N. Moodie;Ting Xiao
与深层盐渍含水层中的二氧化碳储存相比，地质二氧化碳封存与提高石油采收率(CO2-EOR)包括复杂的多相流过程。影响CO2提高采收率多相流的两个最重要因素是三相相对渗透率和相关的滞后，这两个因素都很难测量，通常用数值内插模型来表示。这项研究的目的是为了加深对(1)不同的三相相对渗透率模型和滞后模型对二氧化碳捕获机理的相对影响，以及(2)与这两个因素相关的不确定性的理解。四种不同的三相相对渗透率模型和三种滞后模型被用于模拟位于德克萨斯州西部的一个活跃的CO2提高采油地点-SACROC单元。为了消除确定性参数可能存在的偏差，我们根据测井和地震调查的数据，利用序贯高斯模拟技术生成了50个描述孔隙度和渗透率非均质性的实现。预测CO2储量的模拟结果表明：(1)三相相对渗透率模型和滞后模型的选择对预测的CO2封存能力有显著影响，(2)三相相对渗透率模型和滞后模型对CO2捕集能力的影响在注入CO2期间较小，在三次采油后增大；(3)相对于三相相对渗透率模型的选择，滞后模型的具体选择更为重要；采用推荐的三相水交替气(WAG)滞回模型可能会增加三相相对渗透率模型的影响，并且由于非均质性而产生不确定性。
Geological CO2 sequestration in conjunction with enhanced oil recovery (CO2‐EOR) includes complex multiphase flow processes compared to CO2 storage in deep saline aquifers. Two of the most important factors affecting multiphase flow in CO2‐EOR are three‐phase relative permeability and associated hysteresis, both of which are difficult to measure and are usually represented by numerical interpolation models. The purpose of this study is to improve understanding of (1) the relative impacts of different three‐phase relative permeability models and hysteresis models on CO2 trapping mechanisms, and (2) uncertainty associated with these two factors. Four different three‐phase relative permeability models and three hysteresis models were applied to simulations of an active CO2‐EOR site, the SACROC unit located in western Texas. To eliminate possible bias of deterministic parameters, we utilized a sequential Gaussian simulation technique to generate 50 realizations to describe heterogeneity of porosity and permeability, based on data obtained from well logs and seismic survey. Simulation results of forecasted CO2 storage suggested that (1) the choice of three‐phase relative permeability model and hysteresis model led to noticeable impacts on forecasted CO2 sequestration capacity; (2) impacts of three‐phase relative permeability models and hysteresis models on CO2 trapping are small during the CO2‐EOR injection period, and increase during the post‐EOR CO2 injection period; (3) the specific choice of hysteresis model is more important relative to the choice of three‐phase relative permeability model; and (4) using the recommended three‐phase WAG (Water‐Alternating‐Gas) hysteresis model may increase the impact of three‐phase relative permeability models and uncertainty due to heterogeneity.