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

Abstract

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

CLC Number:

TE357.42

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.

Figures/Tables 10

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

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

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