A New Method for Characterizing Remaining Oil in High Water-Cut Reservoirs

doi:10.7657/XJPG20230607

Abstract

Abstract:

Remaining oil aggregation is a key indicator for evaluating the recovery effect and potential of high water-cut reservoirs. In this study, the dominant reserves zones within the reservoir are determined based on remaining reserves abundance. The weights of indicators are determined with the entropy weight method by using block area, distribution density and shape index. Finally, the remaining oil aggregation is characterized. The results show that, for a reservoir under steady development, the dispersion and accumulation of remaining oil can be divided into four stages: primary dispersion, rapid separation, fluctuating accumulation and dispersion, and secondary dispersion. Utilizing these characterization indicators, an evaluation was conducted on the Nm3-4-1 layer in No.7 fault block in Block 2 of the East Dagang Development Area, Dagang oilfield. The results show that the remaining oil aggregation in Nm3-4-1 decreased steadily with the progress of development, and it starts to rise owing to injection-production structure and well pattern adjustments.

Key words: high water-cut, entropy weight method, remaining oil, aggregation, shape index, injection-production pattern, distribution density, recovery factor

CLC Number:

TE345

ZHAO Chenyun, DOU Songjiang, DOU Yu, LIU Chaoyang, HUANG Bo, WANG Zhenyu, LI Gang. A New Method for Characterizing Remaining Oil in High Water-Cut Reservoirs[J]. Xinjiang Petroleum Geology, 2023, 44(6): 690-695.

Figures/Tables 6

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