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Experimental Research on the Millimeter-Scale Distribution of Oil in Heterogeneous reservoirs

fluid Dynamics & Materials Processing 2023年第6期19卷 1521-1534页

作者： Zhao Yu Exploration&Development Research Institute Daqing Oilfield CompanyDaqing163712China heilongjiang provincial key laboratory of reservoir physics&fluid mechanics in porous media Daqing163712China

Oil saturation is a critical parameter when designing oil field development plans.This study focuses on the change of oil saturation during water flooding.Particularly,a meter-level artificial model is used to conduct relevant experiments on the basis of similarity principles and taking into account the layer geological characteristics of the reservoir.The displacement experiment’s total recovery rate is 41.35%.The changes in the remaining oil saturation at a millimeter-scale are examined using medical spiral computer tomography principles.In all experimental stages,regions exists where the oil saturation decline is more than 10.0%.The shrinkage percentage is 20.70%in the horizontal well production stage.The oil saturation reduction in other parts is less than 10.0%,and there are regions where the oil saturation increases in the conventional water flooding stage.

关键词： Heterogeneous reservoir millimeter-scale oil saturation MSCT scan method oil displacement experiment

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β-cyclodextrin assists salt-resistance polymer flooding:Injectivity improvement

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Petroleum 2020年第3期6卷 271-276页

作者： Shengwang Yuan Exploration and Development Research Institute of Daqing Oilfield Company Ltd Daqing163712China heilongjiang provincial key laboratory of reservoir physics&fluid mechanics in porous Medium Daqing163712China

Polymer flooding method has attracted wide attentions in petroleum industry because of its relatively simple process equipment,low cost of agents and good performance on enhancing oil recovery.However,common polymer can hardly meet the technical requirements of the oilfields with high salinity.Existing salt-resistance polymer solutions get a large viscosity in high salinity condition by changing polymer molecules aggregation which,however,may result in the poor adaptability between polymer molecules and the pore sizes of reservoir.β-cyclodextrin(β-CD),a kind of chemical agent,is found to enhance the injectivity of salt-resistance polymer solutions by wrapping the hydrophobic groupings of salt-resistance polymer molecules.For a certain reservoir,the addition ofβ-cyclodextrin into salt-resistance polymer solution can balance the effect of plugging the layers with high permeability and the purpose of diverting to the layers with low and medium permeability.In this paper,viscosity of polymer solution is tested in condition of different concentrations ofβ-CD.On that basis,experiments on seepage characteristics are carried out to evaluate the injectivity of salt-resistance polymer solution.Finally,an appropriate concentration ofβ-CD,which is added into salt-resistance polymer solution,is chosen to adapt a certain reservoir with heterogeneity.

关键词： Salt-resistance polymer solutions Adaptability β-cyclodextrin Heterogeneity

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