多层油藏非活塞式水驱驱替效率研究
|
摘要
中国很多储层都是由完全间隔开的砂层组成的。准确计算水驱驱替效率将为高效合理地开发该类油藏提供理论依据。建立线性多层非活塞式水驱驱替模型,运用达西渗流理论可确定各油层的水驱注入量;综合运用各层等饱和度面运动方程和Welge-Craig方程分析各层的水驱驱替状况与总体含水率之间的关系。算例分析表明,在总注入量一定的情况下,绝对渗透率和油层厚度是影响各油层注入量的主要因素。储层渗透率越大,驱替效果越好;油层厚度对驱替效率也有一定的影响,但其影响远没有储层渗透率那么大,薄层的驱替效率稍好于厚层。应用所介绍的方法可以准确简单地评价多层油藏的各油层水驱开发动用状况,从而为预测多层油藏极限采收率和合理选择调剖堵水等工艺的时机提供理论指导。
The multilayered reservoirs contain many impenetrable sand in-terlayers,which entirely separate the reservoirs.It is valuable to calculate the displacement efficiency of these reservoirs with waterflooding,which can guide the exploration in theory.The model of liner non-piston water drive in multilayered reservoirs was established.Darcy's law was applied to estimate the injection rate of each layer.And each layer's motion equation of isosaturation surface and Welge-Craig equation were used to analyze the relationshipbetween displacement efficiency of waterflood and total water cut.According to the example,the absolute permeability and oil layer thickness are the main factors influencing the injectionrate of the oil layer with certain total injection rate.The layerswith larger permeability have higher displacement efficiency. And the thickness of the layers also has some effect on the displacementefficiency.The displacement efficiency of thin layers is higher than that of thick layers.Utilizing this method,the displacementefficiency of each layer could be calculated,which can guide theoretically the forecast of ultimate recovery efficiency and the choosing of time of profile control and water plugging in multilayeredreservoirs.
The multilayered reservoirs contain many impenetrable sand in-terlayers,which entirely separate the reservoirs.It is valuable to calculate the displacement efficiency of these reservoirs with waterflooding,which can guide the exploration in theory.The model of liner non-piston water drive in multilayered reservoirs was established.Darcy's law was applied to estimate the injection rate of each layer.And each layer's motion equation of isosaturation surface and Welge-Craig equation were used to analyze the relationshipbetween displacement efficiency of waterflood and total water cut.According to the example,the absolute permeability and oil layer thickness are the main factors influencing the injectionrate of the oil layer with certain total injection rate.The layerswith larger permeability have higher displacement efficiency. And the thickness of the layers also has some effect on the displacementefficiency.The displacement efficiency of thin layers is higher than that of thick layers.Utilizing this method,the displacementefficiency of each layer could be calculated,which can guide theoretically the forecast of ultimate recovery efficiency and the choosing of time of profile control and water plugging in multilayeredreservoirs.
引文
[1]Buckley S E,Leverett M C.Mechanism of fluid displacement in sands[J].Trans.AIME,1942,14(46):107-116.
[2]Welge H J.Predicting displacement efficiency from water-cut or gas-cut field data[R].SPE5313,1975.
[3]陶军,姚军,李爱芬,等.利用孔隙级网络模型研究油水两相流[J].油气地质与采收率,2007,14(2):74-77.
[4]孙志刚.低含油饱和度砂岩油藏水驱特征实验[J].油气地质与采收率,2008,15(2):105-108.
[5]Hearn C L.Simulation of stratified waterflooding by pseudo relative permeability curves[R].SPE2029,1971.
[6]Zhang Shengzong,Hu Jianguo,Li Zhongxing,et al.A calculation of pseudo relative permeability curve using reservoir performance data[R].SPE20791,1990.
[7]马贤圣,呼舜兴,耿师江,等.多层水驱实验在桥口油田开发中的应用[J].西安石油学院学报:自然科学版,2003,18(6):48-50.
[8]周英芳,刘志军,茆春锦,等.多层油藏水驱驱替效率计算新方法[J].特种油气藏,2008,15(3):72-75.
[9]石玉梅,刘雯丽,姚逢昌,等.用地震法监测水驱薄互层油藏剩余油的可行性研究[J].石油学报,2003,24(5):52-56.
[2]Welge H J.Predicting displacement efficiency from water-cut or gas-cut field data[R].SPE5313,1975.
[3]陶军,姚军,李爱芬,等.利用孔隙级网络模型研究油水两相流[J].油气地质与采收率,2007,14(2):74-77.
[4]孙志刚.低含油饱和度砂岩油藏水驱特征实验[J].油气地质与采收率,2008,15(2):105-108.
[5]Hearn C L.Simulation of stratified waterflooding by pseudo relative permeability curves[R].SPE2029,1971.
[6]Zhang Shengzong,Hu Jianguo,Li Zhongxing,et al.A calculation of pseudo relative permeability curve using reservoir performance data[R].SPE20791,1990.
[7]马贤圣,呼舜兴,耿师江,等.多层水驱实验在桥口油田开发中的应用[J].西安石油学院学报:自然科学版,2003,18(6):48-50.
[8]周英芳,刘志军,茆春锦,等.多层油藏水驱驱替效率计算新方法[J].特种油气藏,2008,15(3):72-75.
[9]石玉梅,刘雯丽,姚逢昌,等.用地震法监测水驱薄互层油藏剩余油的可行性研究[J].石油学报,2003,24(5):52-56.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心