系线法研究CO2驱最小混相压力影响因素

Abstract

Abstract:

The minimum miscibility pressure（MMP） of CO₂ flooding is affected by crude oil components and reservoir temperature. And its influence rule has great significance to screen and evaluate gas injection reservoirs. The tie-line analysis is a method to calculate MMP analytical approach which is faster, more accurate, and easier to operate. In this paper, a calculation process of simulating CO₂ flooding by tie-line analysis was proposed, and the influence law of components（C₄, C₁₀, C₁₄, C₂₀） and temperature on MMP was studied. The results showed that the simulation results of the tie-line analysis were similar to those of the slim tube numerical simulation. The MMP increased with the increase of temperature, and the sensitivity of MMP for each component was more obvious in higher temperature. The MMP decreased with the increase of C₄, C₁₀ and C₁₄components, but increased with the increase of C₂₀ component. The study proposed a new method with simple process and accurate calculation for calculating MMP and evaluating influencing factors.

Key words: CO₂ miscible flooding, minimum miscibility pressure（MMP）, crude oil component, tie-line analysis

CLC Number:

TE357.45

Guangyu Yang,Yong Tang,Zhaoguo Li, et al. Study on factors affecting minimum miscibility pressure of CO₂ flooding by tie-line analysis[J]. Reservoir Evaluation and Development, 2019, 9(3): 32-35.

Figures/Tables 8

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References 16

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系线	CH₄	CO₂	C₄	C₁₀	C₁₄	C₂₀
初始系线	√	√	√	√	√	√
交叉系线1		√	√	√	√	√
交叉系线2		√		√	√	√
交叉系线3		√			√	√
注入系线		√				√

Study on factors affecting minimum miscibility pressure of CO₂ flooding by tie-line analysis

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[2]	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.
[3]	Tang Yong,Zhao Xuemei,Wang Yang. Analysis of influence factor of minimum miscible pressure of CO₂ [J]. Reservoir Evaluation and Development, 2018, 8(4): 42-45.

Study on factors affecting minimum miscibility pressure of CO2 flooding by tie-line analysis

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Study on factors affecting minimum miscibility pressure of CO₂ flooding by tie-line analysis