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现代地质 ›› 2019, Vol. 33 ›› Issue (04): 911-918.DOI: 10.19657/j.geoscience.1000-8527.2019.04.22

• 石油地质学 • 上一篇    

CO2驱微观可视化技术在超低渗储层中的应用可行性研究:以鄂尔多斯盆地为例

李明1(), 朱玉双1(), 李文宏2, 袁国伟2, 杜朝锋2   

  1. 1.大陆动力学国家重点实验室,二氧化碳捕集与封存技术国家地方联合工程研究中心,西北大学 地质学系,陕西 西安 710069
    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:2018-01-05 修回日期:2018-05-10 出版日期:2019-08-20 发布日期:2019-09-05
  • 通讯作者: 朱玉双
  • 作者简介:朱玉双,女,博士生导师,教授,1968年出生,石油与天然气地质专业,主要从事油气田开发地质、油藏描述与剩余油挖潜方面的研究教学工作。Email: yshzhu@nwu.edu.cn
    李明,男,硕士研究生,1994年出生,矿产普查与勘探专业,主要从事油气田开发地质与提高采收率技术方面的研究。Email: geoliming@163.com
  • 基金资助:
    中国石油天然气股份有限公司重大科技专项(2014E3601);二氧化碳捕集与封存技术国家地方联合工程研究中心资助项目

Feasibility Study on Applying CO2-flooding Micro-visualization Technology in Ultra-low Permeability Reservoirs: A Case Study in Ordos Basin

LI Ming1(), ZHU Yushuang1(), LI Wenhong2, YUAN Guowei2, DU Chaofeng2   

  1. 1. State Key Laboratory of Continental Dynamics/National & Local Joint Engineering Research Center for Carbon Capture and Storage Technology/Department of Geology, Northwest University, Xi’an,Shaanxi 710069, China
    2. Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi’an,Shaanxi 710018, China
  • Received:2018-01-05 Revised:2018-05-10 Online:2019-08-20 Published:2019-09-05
  • Contact: ZHU Yushuang

摘要:

CO2驱油是提高特低渗、超低渗油藏驱油效率的重要途径,但目前由于匮乏CO2驱油微观可视化实验技术,制约了CO2驱油微观机理研究及驱油效果评价。本研究提出特低、超低渗油藏高温高压下CO2驱油微观可视化实验技术,为该类油藏CO2驱油机理研究提供良好的研究手段。以鄂尔多斯盆地超低渗储层为例,利用首次研制成功的高温、高压、防暴真实砂岩模型,成功进行了CO2驱油微观可视化实验研究,首次镜下观察不同相态CO2在超低渗储层复杂孔喉中驱替原油的动态现象,重新认识超低渗油藏注CO2驱油时不同孔喉结构中CO2赋存状态和渗流规律。结果表明,储层微观孔喉结构,尤其是孔喉大小分布的均匀程度,对CO2驱油效率的重要影响超出预期,直接决定着CO2能否进入储层以及其后的渗流路径。CO2驱油微观可视化实验技术可有效进行CO2驱油微观机理研究及驱油效果评价研究,并为后期进行油藏矿场试验提供指导意见。

关键词: 超低渗储层, CO2驱油, 微观可视化技术, 孔喉结构, 驱油效率

Abstract:

CO2-flooding is an important way to improve oil displacement efficiency in extra-/ultra-low permeability reservoirs. However, the microscopic mechanism of CO2-flooding and oil displacement effect evaluation are hampered by the lack of micro-visualization technology. In this study, we suggested that micro-visualization experiments of CO2-flooding in extra-/ultra-low permeability reservoirs under high temperature and pressure can satisfactorily reveal the CO2-flooding mechanism.Ultra-low permeability reservoirs in the Ordos Basin are taken as examples, and micro-visualization experiments of CO2-flooding were newly and successfully carried out by using the high temperature, high pressure and anti-riot real sandstone model. Dynamic phenomena of the different CO2 phases (in crude oil displacement) in the complex pore throat of the ultra-low permeability reservoirs were simultaneously observed under the microscope, and the occurrence and seepage of CO2 in the different pore throat structures were obtained. The pore throat structure, especially the uniformity of pore throat size distribution (critical for the CO2-flooding efficiency), directly determines whether the CO2 can enter the reservoir and the subsequent seepage path. The micro-visualization experiment of CO2-flooding can not only effectively reveal the microscopic mechanism of CO2-flooding and evaluate the oil displacement effect, but can also provide guidance for later-stage reservoir analyses.

Key words: ultra-low permeability, CO2-flooding, micro-visualization, pore throat structure, oil displacement efficiency

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