系线法研究CO2驱最小混相压力影响因素

油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (3): 32-35.

系线法研究CO₂驱最小混相压力影响因素

杨光宇¹,汤勇¹,李兆国²,张永强²,余光明²

^1. 西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 61050
^2. 中国石油长庆油田分公司勘探开发研究院,陕西西安 710018

收稿日期:2019-02-03 出版日期:2019-06-26 发布日期:2019-07-02
作者简介:杨光宇（1994 —）,男,在读硕士研究生,油气田开发工程。E-mail： 594077641@qq.com。
基金资助:
四川省教育厅创新团队计划(自然科学)“温室气体二氧化碳埋存与资源化利用”(16TD0010);四川省科技计划项目“特低渗透油藏CO₂驱微观渗流理论及影响机制研究”(2019YJ0423)

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

Yang Guangyu¹,Tang Yong¹,Li Zhaoguo²,Zhang Yongqiang²,Yu Guangming²

^1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
^2. Exploration and Development Research Institute, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi, 710018, China

Received:2019-02-03 Online:2019-06-26 Published:2019-07-02

摘要/Abstract

摘要：

原油组分和油藏温度对CO₂驱最小混相压力影响规律对于注气油藏筛选和评价具有重要意义。系线法是一种使用解析方式计算最小混相压力的方法,速度快,精确度高,操作方便。建立了系线法模拟油藏CO₂驱最小混相压力计算流程,研究了原油中C₄、C₁₀、C₁₄和C₂₀组分及温度对最小混相压力的影响规律。结果显示：系线分析法与细管数值模拟结果相近。随温度升高混相压力增加,高温时组分含量对最小混相压力敏感性更强;最小混相压力随着原油中C₄、C₁₀、C₁₄组分含量增加而减小,随C₂₀含量的增加而增大。该研究为注气最小混相压力计算及影响因素评价提供了一种流程简单、计算准确的新方法。

关键词: CO₂混相驱, 最小混相压力, 原油组分, 系线法

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

中图分类号:

TE357.45

杨光宇,汤勇,李兆国,张永强,余光明. 系线法研究CO₂驱最小混相压力影响因素[J]. 油气藏评价与开发, 2019, 9(3): 32-35.

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

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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		√				√

系线法研究CO₂驱最小混相压力影响因素

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

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