基于三参数非线性渗流的低渗透砂岩油藏CO_2非混相驱相渗计算模型  

Relative permeability calculation model of CO_2 immiscible flooding in low permeability reservoir based on the three parameter nonlinear seepage

作　　者：王玉霞 周立发[1,2] 焦尊生 尚庆华 WANG Yuxia;ZHOU Lifa;JIAO Zunsheng;SHANG Qinghua(State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi′an 710069,China;Shaanxi Provincial Institute of Energy Resources&Chemical Engineering,Xi′an 710069,China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.Ltd.,Xi′an 710075,China)

机构地区：[1]西北大学大陆动力学国家重点实验室/地质学系,陕西西安710069 [2]陕西省能源化工研究院,陕西西安710069 [3]陕西延长石油(集团)有限责任公司研究院,陕西西安710075

出　　处：《西北大学学报（自然科学版）》2018年第1期107-114,131,共9页Journal of Northwest University（Natural Science Edition）

基　　金：国家科技支撑计划基金资助项目(2012BAC26B00);陕西省科技统筹创新工程计划基金资助项目(2014KTZB03-02)

摘　　要：基于三参数非线性渗流模型,考虑CO_2非混相驱油过程中气相滑脱、CO_2在原油中的溶解以及溶解后流体黏度的变化等因素的影响,建立低渗透砂岩油藏CO_2非混相驱相渗计算模型。利用建立的模型对陕北地区某致密砂岩油藏天然岩心CO_2驱油非稳态相渗实验数据进行处理,得到了其CO_2非混相驱典型相渗曲线,并与传统的JBN计算方法相比,结果表现出了明显的差异。同时,计算和对比分析了渗流模式、CO_2溶解降黏作用及气体滑脱效应等单因素影响的相渗曲线。结果表明,非线性渗流及CO_2的溶解降黏均使油相相对渗透率上升,气相相对渗透率下降,影响较大。考虑气相滑脱时,气相渗透率有小幅度下降,油相渗透率基本无变化。该模型的建立为更加真实准确地表征低渗透砂岩油藏CO_2非混相驱相渗特征提供了有效的技术方法和手段,对提高其油藏工程分析及数值模拟预测的可靠性具有重要意义。Relative permeability is an important parameter to describe characteristics of multiphase flow in porous media.Based on nonlinear seepage flow model of three parameters,with consideration of gas phase slippage,CO 2 solubility in the crude oil and viscosity reduction caused by CO 2 dissolution,this thesis established relative permeability calculation model of CO 2 immiscible flooding in low permeability reservoir.By means of this new model,the experiment data from unsteady CO 2-oil permeability of a tight sandstone reservoir in Northern Shaanxi Province is processed,the typical permeability curves are plotted,and relative permeability curves effected by single factor of seepage model,CO 2dissolution and viscosity reduction and gas slippage are calculated and proved to be different with the one calculated by traditional JBN method.The results show that nonlinear seepage and CO 2 dissolution and viscosity reduction give rise to oil phase relative permeability increase,and gas phase relative permeability decline.Gas slippage effect only makes a contribution to gas phase permeability decline,but has nos influence on oil phase relative permeability.It is of great significance to improve the precision of reservoir engineering analysis and numerical simulation.

关 键 词：低渗透油藏 CO2非混相驱 非线性渗流 相对渗透率 溶解 气相滑脱 

分 类 号：TE348[石油与天然气工程—油气田开发工程]