低渗透油藏CO2非混相驱前缘移动规律研究

doi:10.11885/j.issn.1674-5086.2017.02.28.06

西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (3): 121-128.DOI: 10.11885/j.issn.1674-5086.2017.02.28.06

低渗透油藏CO₂非混相驱前缘移动规律研究

孟凡坤^1,2, 雷群¹, 苏玉亮², 何东博¹

1. 中国石油勘探开发研究院, 北京海淀 100083;
2. 中国石油大学(华东)石油工程学院, 山东青岛 266580

收稿日期:2017-02-28 出版日期:2018-06-01 发布日期:2018-06-01
通讯作者: 孟凡坤,E-mail:mengfk09021021@163.com
作者简介:孟凡坤,1990年生,男,汉族,山东阳信人,博士研究生,主要从事非常规气藏数值模拟、产能预测与注气提高采收率等的研究工作。E-mail:mengfk09021021@163.com;雷群,1963年生,男,汉族,宁夏永宁人,教授级高级工程师,博士生导师,主要从事低渗、特低渗油气田开发技术研究。E-mail:eiqun@petrochina.com.cn;苏玉亮,1970年生,男,汉族,山东广饶人,教授,博士生导师,主要从事低渗油藏驱替机制及开采、注气提高采收率、深水油气田开发研究。E-mail:suyuliang@upc.edu.cn;何东博,1972年生,男,汉族,河北献县人,教授级高级工程师,主要从事沉积储层、开发地质、开发方案以及天然气开发与规划的研究工作。E-mail:311@petrochina.com.cn
基金资助:
国家重点基础研究发展计划（2014CB239103）；国家自然科学基金（51674279）；国家科技重大专项（2016ZX05015-003）；教育部长江学者和创新团队发展计划（IRT1294）

Law of CO₂ Immiscible Front Movement in Low-permeability Oil Reservoir

MENG Fankun^1,2, LEI Qun¹, SU Yuliang², HE Dongbo¹

1. PetroChina Research Institute of Petroleum Exploration & Development, Haidian, Beijing 100083, China;
2. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580, China

Received:2017-02-28 Online:2018-06-01 Published:2018-06-01

摘要/Abstract

摘要： 低渗透油藏CO₂非混相驱不同流体间相互作用复杂，前缘描述困难。为此，基于改进的CO₂驱相对渗透率模型，并考虑CO₂在原油中溶解及油相启动压力梯度的影响，推导出低渗透油藏CO₂驱分流量方程；引入渗流阻滞系数，对B-L方程进行修正，确立CO₂驱替前缘移动速度及饱和度剖面计算方法。通过与CO₂驱实验数据获取的含气饱和度剖面相对比，验证了计算方法的准确性。分析CO₂溶解作用、不同原油黏度及注入压力对CO₂驱前缘移动规律的影响，结果表明，考虑CO₂在原油中的溶解，前缘移动速度降低幅度超过50%；原油黏度越高，前缘移动速度越大；前缘移动速度随注入压力的增大而减小，并在最小混相压力处出现拐点。针对吉林、胜利与延长油田典型CO₂驱试验区，通过对比3者含气饱和度剖面分布，对3个区块CO₂驱的适应性进行了评价。

关键词: 低渗透油藏, CO₂非混相驱, B-L方程, 前缘移动速度, 饱和度剖面

Abstract: The interaction of different fluids in carbon dioxide (CO₂) immiscible flooding in a low-permeability oil reservoir is complex, and the description of the front is difficult. Therefore, the fractional flow model for the CO₂ immiscible flooding in a low-permeability oil reservoir was derived herein based on an improved relative permeability model for CO₂ flooding, considering the CO₂ dissolution in crude oil and the influence of the pressure gradient of the oil phase. The computing method of the front movement speed of CO₂ flooding and the saturation profile was established by introducing the seepage retardation factor to correct the B-L equation. The veracity of this computing method was verified by comparing with the gas saturation profile obtained from the CO₂ flooding empirical data. The CO₂ dissolution, viscosity of different crude oils, and influence of the injection pressure on the front movement speed of CO₂ flooding were analyzed. The results indicated that the front movement speed was reduced by more than 50% considering the CO₂ dissolution in crude oil. Moreover, the higher the crudeoil viscosity, the greater the front movement speed. The front movement speed decreased with the increase in the injection pressure and inflected at the point of minimum miscible pressure. The adaptability of the CO₂ flooding of three typical test sites in the Jilin, Shengli, and Yanchang oil fields was evaluated by comparing the distributions of their gas saturation profile.

Key words: low permeability oil reservoir, CO₂ immiscible flooding, B-L equation, front movement speed, saturation profile

中图分类号:

TE357

孟凡坤, 雷群, 苏玉亮, 何东博. 低渗透油藏CO₂非混相驱前缘移动规律研究[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 121-128.

MENG Fankun, LEI Qun, SU Yuliang, HE Dongbo. Law of CO₂ Immiscible Front Movement in Low-permeability Oil Reservoir[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 121-128.

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低渗透油藏CO₂非混相驱前缘移动规律研究

Law of CO₂ Immiscible Front Movement in Low-permeability Oil Reservoir

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