渤海湾盆地永安油田永66区块氮气驱油机理

doi:10.12108/yxyqc.20200217

岩性油气藏 ›› 2020, Vol. 32 ›› Issue (2): 149–160.doi: 10.12108/yxyqc.20200217

渤海湾盆地永安油田永66区块氮气驱油机理

关华¹, 郭平¹, 赵春兰¹, 谭保国², 徐冬梅²

1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500;
2. 中国石化胜利油田分公司勘探开发研究院, 山东东营 257015

收稿日期:2019-06-23 修回日期:2019-09-17 出版日期:2020-03-21 发布日期:2020-01-19
第一作者:关华,女(1995-),西南石油大学在读硕士研究生,研究方向为油藏数值模拟、提高采收率。地址:(610500)四川省成都市新都区新都大道8号西南石油大学。Email:guanhuaoffice@163.com。
基金资助:
国家油气重大专项“复杂断块油田提高采收率技术”（编号：2016ZX05011-002）资助

Mechanism of nitrogen flooding in Yong 66 block of Yong'an Oilfield,Bohai Bay Basin

GUAN Hua¹, GUO Ping¹, ZHAO Chunlan¹, TAN Baoguo², XU Dongmei²

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
2. Research Institute of Exploration and Development, SINOPEC Shengli Oilfield Company, Dongying 257015, Shandong, China

Received:2019-06-23 Revised:2019-09-17 Online:2020-03-21 Published:2020-01-19

摘要/Abstract

摘要： 为研究渤海湾盆地永安油田永66区块氮气驱油机理及其变化规律，在地质认识基础上开展了流体相态实验和数值模拟研究。结果表明：①注氮气吞吐过程中，地层倾角、驱替速度以及毛管压力的大小对地层含油饱和度和界面张力的变化均具有明显控制作用；②地层倾角越大、驱替速度越快，原油越容易被驱替至油藏底部，从而油藏底部的含油饱和度越大，而油藏顶部流体则变成油气两相，界面张力增加；③在氮气驱油过程中，随着毛管压力的增加，气体进入孔隙的阻力增大，底部含油饱和度也会随之增大，但原油向油层底部聚集的速度减慢，顶部界面张力增大，含油饱和度和界面张力变化的范围和程度逐渐减小。该研究成果对油气田开发过程中利用氮气驱油提高采收率具有指导作用。

关键词: 流体相态实验, 相态拟合, 数值模拟, 氮气驱油, 永安油田, 渤海湾盆地

Abstract: In order to study the mechanism of nitrogen flooding and its variation law in Yong 66 block of Yong'an Oilfield in Bohai Bay Basin,fluid phase experiments and numerical simulations were carried out on the basis of geological study. The results show that:(1)During the nitrogen injection process,the formation dip angle,displacement velocity and capillary pressure have obvious effects on the change of oil saturation and interfacial tension. (2)The greater the formation dip angle and displacement velocity are,more crude oil is displaced to the bottom of the reservoir,the greater the oil saturation at the bottom of the reservoir is. At the same time,the upper fluid of the reservoir becomes the two phases of oil and gas,and the interfacial tension increases.(3)During the process of nitrogen flooding,as the capillary pressure increases,the resistance of the gas entering into the pores increases, and so does the oil saturation at the bottom,although the accumulation of crude oil to the bottom of the reservoir slows down. Also,the tension at the top interface increases,while the range and degree of the change gradually decreases. The research results have a guiding role in the application of nitrogen flooding to enhance oil recovery in the development of oil and gas fields.

Key words: fluid phase experiment, phase behavior matching, numerical simulation, nitrogen flooding, Yong'an Oilfield, Bohai Bay Basin

中图分类号:

TE357.7

关华, 郭平, 赵春兰, 谭保国, 徐冬梅. 渤海湾盆地永安油田永66区块氮气驱油机理[J]. 岩性油气藏, 2020, 32(2): 149–160.

GUAN Hua, GUO Ping, ZHAO Chunlan, TAN Baoguo, XU Dongmei. Mechanism of nitrogen flooding in Yong 66 block of Yong'an Oilfield,Bohai Bay Basin[J]. Lithologic Reservoirs, 2020, 32(2): 149–160.

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渤海湾盆地永安油田永66区块氮气驱油机理

Mechanism of nitrogen flooding in Yong 66 block of Yong'an Oilfield,Bohai Bay Basin

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