Influences of Superposition of Multi-Block Cumulative Production Index on Estimated Oil Recovery

doi:10.7657/XJPG20230313

Abstract

Abstract:

Various blocks of a same reservoir might be developed at different time, which leads to the underestimate of oil recovery when using comprehensive reservoir development data to calibrate oil recovery factor. In order to solve this problem, two blocks with different lag time, productivity and OOIP were designed. Through comparative analysis of indexes, the influencing factors were analyzed quantitatively. The results show that, with the same waterflooding model, the recovery factor estimated by superposing cumulative production index is lower than the sum of the recovery factor estimated separately for each block. The larger the proportion of productivity or geological reserves of a new development block and the later the block is developed, the lower the estimated recovery factor through the superposition of cumulative production index. Therefore, when using waterflooding curves to calibrate recovery factor, the oil reservoir should be divided into several units according to the similar production time as possible to calculate the recovery factor separately; otherwise, calculating recovery factor by superposing cumulative production index will result in a lower calibration of recoverable reserves or recovery factor.

Key words: waterflooding reservoir, multi-block, waterflooding characteristic curve, water cut variation, superposition, development lag time, estimated recovery factor, factor analysis

CLC Number:

TE341

SONG Chengyuan, YANG Xiaoxuan, YUAN Yuying, LI Yanming. Influences of Superposition of Multi-Block Cumulative Production Index on Estimated Oil Recovery[J]. Xinjiang Petroleum Geology, 2023, 44(3): 352-358.

Figures/Tables 10

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