西南石油大学学报(自然科学版)

• 石油与天然气工程 • 上一篇    下一篇

气体示踪表征CO2 驱渗流特征实验研究

郭文敏1,2 *,李治平1,吕爱华2,万国赋2   

  1. 1. 中国地质大学(北京)能源学院,北京海淀100083
    2. 常州大学石油工程学院,江苏常州213016
  • 出版日期:2015-02-01 发布日期:2015-02-01
  • 通讯作者: 郭文敏,E-mail:gwm_petro@126.com
  • 基金资助:

    国家重大科技专项(2009ZX05009006);中国石油科技创新基金(2009D50060201)。

The Experiment Study of Using Gas Tracer on Analysis the Mechanism of
CO2 Flooding

Guo Wenmin1,2*, Li Zhiping1, Lü Aihua2, Wan Guofu2   

  1. 1. School of Energy Resources,China University of Geosciences(Beijing),Haidian,Beijing 100083,China
    2. College of Petroleum Engineering,Changzhou University,Changzhou,Jiangsu 213016,China
  • Online:2015-02-01 Published:2015-02-01

摘要:

为描述地下CO2 驱渗流机理及混相/非混相驱替特征,选取SF6 作为CO2 驱气体示踪剂,利用气体示踪响应
曲线解释原理,从示踪剂曲线的注入体积、曲线峰值、峰宽、药剂回采率及后续曲线预测等角度,描述CO2 在混相/非
混相驱状态下的驱替特征。结果表明:CO2 在混相/非混相驱状态下示踪剂响应曲线不同,示踪剂见剂峰值浓度对应
PV 数越小、峰宽越小、回采率越低、预测模型系数越小,则CO2 混相驱特征越明显,反之为非混相驱替特征,而非混相
特征的出现,将加速CO2 与原油的两相分离,降低驱油效率。CO2 驱油过程示踪监测对于掌握CO2 地下渗流状态,提
高驱油效果具有极为重要的矿场指导意义。

关键词: CO2, SF6, 混相/非混相驱, 气体示踪剂, 响应曲线

Abstract:

In order to describe the characters of the miscible and immiscible CO2 flooding,the SF6 is chosen as the gas tracer.
According to the principle of tracer response,several parameters like PV,peak value of curve,the width of curve,the recovery
rate of tracer and the forecasting of curve were taken into the description of the character of the miscible and immiscible CO2
flooding. The result in this paper illustrated that the curves of the tracer are different between miscible and immiscible driving.
The tracer curve of miscible driving shows narrower the hump is,the lower recovery of the tracer,the smaller the forecasting
coefficient. On the contrary,in immiscible CO2 flooding,oil and gas will be separated and the recovery rate of oil will decrease
sharply. So,the flooding states can be detected by monitoring the gas tracer during CO2 flooding and the findings will improve
the recovery rate of oil.

Key words: CO2, SF6, miscible and immiscible flooding, gas tracer, response curve