特低渗油藏水驱后二氧化碳气水交替驱见效特征

雷欣慧; 郑自刚; 余光明; 张康

doi:10.3969/j.issn.1006-6535.2020.05.017

特种油气藏 >

2020 , Vol. 27 >Issue 5: 113 - 117

DOI: https://doi.org/10.3969/j.issn.1006-6535.2020.05.017

油藏工程

特低渗油藏水驱后二氧化碳气水交替驱见效特征

雷欣慧 ,
郑自刚 ,
余光明 ,
张康

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1.中国石油长庆油田分公司,陕西西安 710018;
2.低渗透油气田勘探开发国家工程实验室,陕西西安 710018

雷欣慧(1984—),女,工程师,2006年毕业于四川大学生物技术专业,2010年毕业于西安石油大学石油工程专业,获硕士学位,现主要从事低渗透油藏提高采收率方面的研究工作。

收稿日期: 2019-11-20

修回日期: 2020-07-06

网络出版日期: 2022-02-18

基金资助

中国石油重大科技专项“特/超低渗油藏CO₂驱油与埋存油藏工程技术方法研究”(2014E-3602);国家科技重大专项“大型油气田及煤层气开发”子课题“CO₂捕集、驱油与埋存技术示范工程”(2016ZX05056)

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Response Characteristics of Gas-water Alternate Flooding with CO₂ after Water Flooding in Ultra-low Permeability Reservoirs

Lei Xinhui ,
Zheng Zigang ,
Yu Guangming ,
Zhang Kang

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1. PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China;
2. Low-permeability Oil & Gas Exploration and Development of National Engineering Laboratory, Xi'an, Shaanxi 710018, China

Received date: 2019-11-20

Revised date: 2020-07-06

Online published: 2022-02-18

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摘要

为明确特低渗透油藏水驱后CO₂气水交替驱见效特征,通过动静结合的方法,结合物理模拟实验获得的驱替动态数据和高温高压相态系统测定的CO₂在油水中的溶解度静态数据,开展水驱后CO₂气水交替驱动态特征研究。结果表明,CO₂驱过程中适当增加气油比可产出溶解CO₂的油气,在油藏条件下为单相油带,该阶段对驱油效果的贡献率为71.98%。建议油藏方案设计时可适当增大第1周期CO₂段塞的尺寸,并选择在气窜临界点交替水驱,可有效提高CO₂的利用率,并改善驱油效果。该研究结果对气水交替驱注入参数的优选具有一定的指导意义。

关键词： CO₂驱; 特低渗; 气水交替; 驱替特征赋存状态; 相带分布

本文引用格式

雷欣慧 , 郑自刚 , 余光明 , 张康 . 特低渗油藏水驱后二氧化碳气水交替驱见效特征[J]. 特种油气藏, 2020 , 27(5) : 113 -117 . DOI: 10.3969/j.issn.1006-6535.2020.05.017

Abstract

In order to clarify the response characteristics of gas-water alternate flooding with CO₂ after water flooding in ultra-low permeability reservoirs, the research on dynamic characteristics of gas-water alternate flooding with CO₂ was carried out. In the research, through the combination of dynamic and static methods, the dynamic data obtained by physical simulation experiments and the static data of CO₂ solubility in oil-water solution measured in high-temperature and high-pressure phase system were used. The results show that appropriately increasing the gas-oil ratio during the CO₂ flooding process can produce oil and gas to dissolve CO₂, forming a single-phase oil zone under reservoir conditions, and the contribution rate of this stage to the oil displacement effect is 71.98%. It is suggested to appropriately increase the size of the CO₂ slug in the first cycle when designing the reservoir plan, and to select the critical point of gas channeling to inject water, which can effectively increase the utilization rate of CO₂ and improve the oil displacement effect. The research results have a certain guiding significance for the optimization of injection parameters for gas-water alternate flooding.

Key words： CO₂ flooding; ultra-low permeability; gas-water alternation; occurrence state of displacement characteristic; facies zone distribution

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