油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (3): 25-31.

• 方法理论 • 上一篇    下一篇

超临界CO2萃取致密油的数值模拟研究

施雷庭1,朱诗杰1,马杰2,杨梅3,彭洋平4,叶仲斌1   

  1. 1. 西南石油大学油气藏地质与开发工程国家重点实验室,四川 成都 610500
    2. 中国石油西南油气田分公司四川华油集团榆林榆川天然气有限责任公司,陕西 榆林 719000
    3. 四川化工职业技术学院,四川 泸州 646099
    4. 中国石油新疆油田分公司百口泉采油厂,新疆 克拉玛依 834000
  • 收稿日期:2019-01-08 发布日期:2019-07-02 出版日期:2019-06-26
  • 作者简介:施雷庭(1976 —),男,副教授,提高采收率教学与科研。E-mail: slting@swpu.edu.cn
  • 基金资助:
    国家科技重大专项“准噶尔盆地致密油开发示范工程——大型油气田及煤层气开发”(2017ZX05070)

Numerical simulation of tight oil extraction with supercritical CO2

Shi Leiting1,Zhu Shijie1,Ma Jie2,Yang Mei3,Peng Yangping4,Ye Zhongbin1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. Yulin Yuchuan Natural Gas Co. Ltd., SPT group, Southwest Oil and Gas Company, CNPC Yulin, Shaanxi 719000, China
    3. Sichuan Vocational College of Chemical Technology, Luzhou, Sichuan 646099, China
    4. Baikouquan Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
  • Received:2019-01-08 Online:2019-07-02 Published:2019-06-26

摘要:

利用CO2萃取作用进行吞吐施工能够克服致密油藏难以形成有效驱替的生产开发难题。通过PVTi模块进行原油馏分劈分,结合注CO2膨胀实验数据得到地层原油的拟组分性质,应用CFD模拟研究影响CO2对致密油萃取的相关因素。结果表明:超临界CO2在多孔介质中主要萃取原油的轻质组分,尤其是C15+以下的组分;注入压力越大,CO2注入量越多,对原油的溶解能力就越强,能增强其对重质组分的萃取;同时CO2的注入量增加还能促进CO2在多孔介质中的滞留,利于CO2的封存;随着孔隙度的增加,CO2的萃取效果先增加后下降,在较低孔隙度条件下依然有44 %的萃取效果。利用CO2萃取致密油具有一定的应用前景。

关键词: 致密油, CO2, 萃取, 多孔介质, 数值模拟

Abstract:

The huff and puff operation by CO2 extraction can overcome the production and development problems of tight reservoirs which are difficult to form effective displacement. Crude oil fractions were divided by PVTi module, and the pseudo-component properties of formation crude oil could be obtained by combining with the expansion experimental data of CO2 injection. Relevant factors affecting the extraction of tight oil by CO2 were studied by CFD simulation. The results showed that supercritical CO2 mainly extracted the light components of crude oil in porous media, especially those below C15+. The higher injection pressure was, and the more CO2 was injected, the stronger the solubility of crude oil would be, and it could enhance the extraction of heavy components. Meanwhile, the increase of CO2 injection could also promote the retention of CO2 in porous media, which was conducive to CO2 storage. With the increase of porosity, the extraction effect of CO2 increased first and then decreased, and was still 44 % under the condition of lower porosity. The extraction of tight oil by CO2 has a certain application prospect.

Key words: tight oil, CO2, extraction, porous media, numerical simulation

中图分类号: 

  • TE348