• 方法技术 •

基于地质储量结构变化的采收率演变趋势

1. 1. 中国石化 石油勘探开发研究院, 北京 100083
2. 国家能源陆相砂岩老油田持续开采研发中心, 北京 100083
• 收稿日期:2020-07-02 出版日期:2020-12-28 发布日期:2020-12-09
• 作者简介:计秉玉(1963-),男,教授级高级工程师,油气田开发与提高采收率研究。E-mail:jby.syky@sinopec.com
• 基金资助:
国家重点研发计划项目(2018YFA0702400);中国工程院重点咨询项目(2019-XZ-15)

Research on overall recovery rate variations of dynamically changing OOIP

Bingyu Ji1,2(), Youqi Wang1,2, Li Zhang1,2

1. 1. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
2. R & D Center of Sustainable Development of Continental Sandstone Mature Oilfield, Beijing 100083, China
• Received:2020-07-02 Online:2020-12-28 Published:2020-12-09

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.