Study on the hierarchical characterization method of breakthrough flow channels in offshore unconsolidated sandstone heavy oil reservoirs driven by polymer flooding

doi:10.3969/j.issn.1006-6535.2025.01.014

Abstract

Abstract: The reservoir of offshore unconsolidated sandstone reservoir is loose and possesses strong heterogeneity.Breakthrough flow occurs during the development of polymer flooding,resulting in ineffective water circulation and seriously affecting the development effect.In view of the above problems,considering the mechanism of polymer flooding,an interwell dynamic calculation model of polymer flooding based on interwell connectivity unit is constructed.On this basis, the characteristic parameters of breakthrough flow channel intensity are determined,and the comprehensive evaluation factor of breakthrough flow channel intensity is formed.A breakthrough channel hierarchical characterization method suitable for polymer flooding in offshore heavy oil reservoirs is established.The research outcomes are applied to the breakthrough flow channel identification of polymer flooding in offshore S Oilfield.The results indicate that compared with the Eclipse model,the historical fit speed of the proposed method can be increased by 154 times,and the fitting error is within 10%.In S1 Area, large channels are identified in A02,A19 and K29 wells,and preferential flowing channels are identified in A13 and A21 wells.The results are in good accordance with the tracer monitoring results,which proves that the new method is reliable.At the same time, two sections of large channels and six sections of preferential flowing channels are identified in S2 Area,which provides support for tapping the potential of remaining oil in this area.The research findings can provide guidance for targeted management and sustainable high efficienct development of inefficient channels in oilfield driven by polymer flooding.

Key words: heavy oil, polymer flooding, breakthrough flow channel, quantitative identification, hierarchical characterization

CLC Number:

TE357

ZHANG Peng, WEI Zhijie, LIU Yuyang, CUI Yongzheng, YONG Wei, ZHANG Jian, ZHOU Wensheng. Study on the hierarchical characterization method of breakthrough flow channels in offshore unconsolidated sandstone heavy oil reservoirs driven by polymer flooding[J]. Special Oil & Gas Reservoirs, 2025, 32(1): 120-126.

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