胜利油田CO2驱油技术现状及下步研究方向

doi:10.13809/j.cnki.cn32-1825/te.2020.03.008

摘要/Abstract

摘要：

CO₂驱是提高低渗透油藏采收率和减少温室气体排放双赢的主要技术。针对胜利油田低渗透油藏CO₂驱面临的混相难、易气窜、波及系数低等技术难题,采用物理模拟和数值模拟相结合的方法,明确了超前注CO₂混相驱的开发机理,形成了特低渗透油藏的超前注CO₂混相驱开发技术,现场应用后增产效果明显,单井日产油增加了5倍。提出降低混相压力的原理和技术思路,研发了降低混相压力体系,降幅可达22 %。分析胜利油田CO₂驱规模应用面临的挑战及对策,提出了深化CO₂驱提高石油采收率的相态理论、研发低成本扩大CO₂驱波及体积技术、发展CO₂非完全混相驱、气窜通道描述与预警等CO₂驱的发展方向,为油田实现CO₂驱规模应用提供技术支撑。

关键词: 超前注气, 特低渗透, 降低混相压力, CO₂混相驱, 研究方向

Abstract:

CO₂ flooding is effective for enhancing the oil recovery in low permeability reservoir and reducing the greenhouse gas emissions. In order to solve the technical problems of difficult miscible phase, easy gas channelling and low sweep coefficient for CO₂ flooding in low permeability reservoir in Shengli Oilfield. By the combination of physical and numerical simulation, the development mechanism of the CO₂ injection miscible flooding long in advance is clarified, and the comprehensive techniques for extra low permeability reservoir is formed. After field application, the stimulation effect is obvious, the daily production of oil per well increase by 5 times. The principle and technical idea of reducing the miscibility pressure are put forward, and the system of reducing the miscible pressure system is developed, which can make the pressure decrease by up to 22 %. The challenge and countermeasure faced by scale application of CO₂ flooding in Shengli Oilfield are analyzed, and the development directions of CO₂ flooding are proposed, such as deepening the phase state theory of oil recovery enhanced by CO₂ flooding, developing CO₂ flooding technology with expanded sweep volume at low cost, developing incomplete CO₂ miscible flooding, and description and early warning of gas channeling. All these provide technical support for oil field to realize scale application of CO₂ flooding.

Key words: advanced gas injection, ultra-low permeability reservoir, reduce miscibility pressure, CO₂ miscible flooding, development direction

中图分类号:

TE357.42

曹绪龙, 吕广忠, 王杰, 张东, 任敏. 胜利油田CO₂驱油技术现状及下步研究方向[J]. 油气藏评价与开发, 2020, 10(3): 51-59.

CAO Xulong, LYU Guangzhong, WANG Jie, ZHANG Dong, REN Min. Present situation and further research direction of CO₂ flooding technology in Shengli Oilfield[J]. Reservoir Evaluation and Development, 2020, 10(3): 51-59.

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胜利油田CO₂驱油技术现状及下步研究方向

Present situation and further research direction of CO₂ flooding technology in Shengli Oilfield

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