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
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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 permeabilitycurves effected by single factor of seepage model,CO_2 dissolution 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.
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 permeabilitycurves effected by single factor of seepage model,CO_2 dissolution 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.
引文
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[13]黄延章,杨正明,何英,等.低渗透多孔介质中的非线性渗流理论[J].力学与实践,2013,35(5):1-8.
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[15]杨胜来,魏俊之.油层物理学[M].北京:石油工业出版社,2015.
[16]董驰.CO2驱相对渗透率测试方法研究[D].大庆:东北石油大学,2011.
[17]BLOOMFIELD V A,DEWAN R K.Viscosity of liquid mixtures[J].Journal of Physical Chemistry,1971,75(20):3113-3119.
[18]罗瑞兰,程林松,朱华银,等.研究低渗气藏气体滑脱效应需注意的问题[J].天然气工业,2007,27(4):92-94.
[19]KLINKENBERG L J.The permeability of porous media to liquids and gases[J].Socar Proceedings,1941,2(2):200-213.
[20]SAMPATH K,KEIGHIM C W.Factors affecting gas slippage in tight sandstones of cretaceous age in the Uinta basin[J].Journal of Petroleum Technology,1982,34(11):2715-2720.
[2]王道富,付金华,雷启鸿,等.鄂尔多斯盆地低渗透油气田勘探开发技术与展望[J].岩性油气藏,2007,19(3):126-130.
[3]樊建明,张庆洲,霍明会,等.超低渗透油藏注CO2开发方式优选及室内实验研究[J].西安石油大学学报(自然科学版),2015,30(5):37-42.
[4]HE W,YANG L,MA C,et al.Effect of micro-pore structure parameter on seepage characteristics in ultralow permeability reservoir:A case from chang6 reservoir of Ordos basin[J].Natural Gas Geoscience,2011,22(3):477-476.
[5]WANG R,LV X,GUO D.Feature parameters of micro pore throat in deep section high pressure and lowpermeability sandstone reservoir[J].Journal of China University of Mining&Technology,2012,41(1):64-68.
[6]YUN M.Fractal study on seepage properties of nonNewtonian Sisko fluid flowing through porous media[J].Journal of Huazhong Normal University(Natural Sciences),2013,47(4):487-490.
[7]ZHANG S,SUN Y,WU X,et al.A comprehensive analysis of the seepage characters of non-Newtonian fluids in fractal porous media[J].Journal of Porous Media,2014,17(12):1031-1044.
[8]郑祥克,陶永建,门承全,等.低速非达西渗流产能方程的建立[J].新疆石油地质,2003,24(2):158-160.
[9]黄延章.低渗透油层渗流机理[M].北京:石油工业出版社,1999.
[10]邓英尔,刘慈群.低渗油藏非线性渗流规律数学模型及其应用[J].石油学报,2001,22(4):72-77.
[11]杨清立,杨正明,王一飞,等.特低渗透油藏渗流理论研究[J].钻采工艺,2007,30(6):52-54.
[12]姜瑞忠,杨仁峰.低渗透油藏非线性渗流理论与数值模拟技术[M].北京:石油工业出版社,2010.
[13]黄延章,杨正明,何英,等.低渗透多孔介质中的非线性渗流理论[J].力学与实践,2013,35(5):1-8.
[14]BUCKLEY S E,LEVERETT M C.Mechanism of fluid displacement in sands[J].Transactions of the Aime,1946,146(1):107-116.
[15]杨胜来,魏俊之.油层物理学[M].北京:石油工业出版社,2015.
[16]董驰.CO2驱相对渗透率测试方法研究[D].大庆:东北石油大学,2011.
[17]BLOOMFIELD V A,DEWAN R K.Viscosity of liquid mixtures[J].Journal of Physical Chemistry,1971,75(20):3113-3119.
[18]罗瑞兰,程林松,朱华银,等.研究低渗气藏气体滑脱效应需注意的问题[J].天然气工业,2007,27(4):92-94.
[19]KLINKENBERG L J.The permeability of porous media to liquids and gases[J].Socar Proceedings,1941,2(2):200-213.
[20]SAMPATH K,KEIGHIM C W.Factors affecting gas slippage in tight sandstones of cretaceous age in the Uinta basin[J].Journal of Petroleum Technology,1982,34(11):2715-2720.