Grey correlation analysis of factors affecting the imbibition of fracturing displacement agents in low-permeability tight oil reservoirs
Hydraulic fracturing-assisted oil displacement technology is a key means to achieve efficient de-velopment of low-permeability tight oil reservoirs.Permeability absorption efficiency is an important indi-cator for evaluating the effectiveness of hydraulic fracturing in tight oil reservoirs with low permeability,and there are many factors that affect the permeability absorption efficiency of hydraulic fracturing agents.In order to clarify the main factors affecting the permeability absorption efficiency of hydraulic fracturing agents in low-permeability tight oil reservoirs,this study uses the grey relational analysis method to explore the degree of influence of various factors on the absorption effect.Firstly,through laboratory tests,the per-formance of hydraulic fracturing agents is evaluated,including wettability,interfacial tension,emulsifica-tion,static adsorption,etc.,and permeability absorption oil displacement experiments are conducted to ob-tain the corresponding permeability absorption efficiency and the increase in permeability absorption effi-ciency.Then,a grey relational analysis model is established to calculate the correlation between the select-ed factors and the permeability absorption efficiency.Finally,the effectiveness of the model is verified through theoretical analysis.The results indicate that wettability and emulsification are the main factors af-fecting the absorption of hydraulic fracturing agents,with a high degree of correlation.On the other hand,the correlation between static adsorption and interfacial tension and absorption is low,and their influence on absorption is small.The results of this study are of great significance for a deeper understanding of the absorption mechanism of hydraulic fracturing agents in low-permeability tight oil reservoirs and the opti-mal selection of hydraulic fracturing agents,providing a theoretical basis and technical support for the effi-cient development of low-permeability tight oil fields.At the same time,it also provides a method refer-ence for the study of absorption factors in other types of reservoirs.
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