基于地质储量结构变化的采收率演变趋势

doi:10.11743/ogg20200613

Abstract

Abstract:

With different types of oil reservoirs being put into development in a proper order according to their respective characteristics, operators may be rewarded with more reserves in a given field.However, with reservoir combinations varying, the overall recovery rates of the field change as well.An ordinary differential equation with reserve as independent variable is established to characterize the changing trend of overall recovery rates with increasing reserves and to quantitatively analyze the overall recovery rate changes of Sinopec's reserves that had been successively put into development (or already under development) from 2011 to 2018.The results show that the relationship between the overall recovery rate and reserve increase can be simplified as the total versus the incremental or the remaining.The main factors influencing the overall recovery rate are the quality and proportion of reserve of a certain reservoir in the whole context.The overall recovery rate of a given field is generally decreasing as more and more hard-to-get reserves are put into development.Following the analysis of the recovery rates of various oil reservoir combinations operated by Sinopec and the factors that influence the rate changes, we propose that future EOR study should be focused on improving the efficiency of water flooding and thermal EOR, expanding the application of chemical flooding, gas injection and microbial recovery, and exploring the possibilities of developing innovative EOR technologies.

Key words: OOIP structure, water flooding, thermal EOR, chemical flooding, overall recovery rate, reservoir development

CLC Number:

TE327

Bingyu Ji, Youqi Wang, Li Zhang. Research on overall recovery rate variations of dynamically changing OOIP[J]. Oil & Gas Geology, 2020, 41(6): 1257-1262.

Figures/Tables 4

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油藏类型	动用储量占比/%	标定采收率/%
整装	19.1	42.6
断块	33.2	28.3
低渗致密	21.0	21.7
稠油	9.1	20.2
缝洞型碳酸盐岩	13.1	15.5
海上	4.5	25.8
合计	100	25.7

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Research on overall recovery rate variations of dynamically changing OOIP

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