Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 145-159.doi: 10.12108/yxyqc.20230113

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Characterization model of oil-water relative permeability curves of sandstone reservoir and its application in numerical simulation

Lü Dongliang1, YANG Jian1, LIN Liming2, ZHANG Kaili1, CHEN Yanhu3   

  1. 1. Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China;
    2. Wuhua Energy Technology Co., Ltd., Xi'an 710000, China;
    3. Sinopec Shengli Oilfield Company, Dongying 257001, Shandong, China
  • Received:2022-06-13 Revised:2022-08-04 Online:2023-01-01 Published:2023-01-06

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Abstract: Taking the sandstone reservoirs of Neogene Guantao Formation in Gudao oilfield of Shengli Oilfield as an example，based on oil-water relative permeability test and geological knowledge，the characterization model of oil-water relative permeability curves was established. The sandstone reservoir model was established by numerical simulation method，and the applicable conditions of model under different rhythms and different development methods and the influence on development results were discussed. The results show that: (1) The correlations of 7 parameters affecting relative permeability curves，such as permeability measured with gas and average pore-throat radius，with endpoints of relative permeability curves and the shape of curves were respectively fitted. Multiple regression method was carried out by using the alternate conditional expectation method，irreducible water saturation calculation model was established based on permeability measured with gas and average pore-throat radius，and residual oil saturation calculation model was established based on permeability variation coefficient and significant parameters. Based on permeability measured with gas，calculation model for relative permeability of oil phase under irreducible water was established. Based on coefficient of variation and significant parameters， calculation model for relative permeability of water phase under residual oil was also established. The absolute errors of the four endpoint characterization models are all less than 0.1. Referring to Honarpour empirical formula， relative permeability curve shape calculation model of oil phase was established based on uniformity coefficient， and relative permeability curve shape calculation model of water phase was established based on permeability variation coefficient and pore-throat ratio. The absolute errors of the two models are less than 1.7，which proves the reliability of models. (2) In the depletion development simulation of sandstone reservoirs，the production performance is mainly controlled by the relative permeability of oil phase. Normalizing curves derived from the model can eliminate the influence of reservoir heterogeneity to a certain extent. In simulated waterflood development，reservoir heterogeneity can exacerbate the impact of water phase relative permeability on production performance. In the simulation，the relative permeability curve of the reservoir that contributes the most to oil production can be closer to the actual production.

Key words: oil-water relative permeability curve, water saturation, multiple regression method, numerical simulation, alternate conditional expectation method, waterflood development, Guantao Formation, Gudao oilfield, Shengli Oilfield

CLC Number: 

  • TE341
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