岩性油气藏 ›› 2022, Vol. 34 ›› Issue (6): 152–159.doi: 10.12108/yxyqc.20220613

• 石油工程与油气田开发 • 上一篇    下一篇

超稠油注气次生泡沫油生成机理及渗流特征

卢迎波   

  1. 中国石油新疆油田分公司 风城油田作业区, 新疆 克拉玛依 834000
  • 收稿日期:2022-02-28 修回日期:2022-05-23 出版日期:2022-11-01 发布日期:2022-11-09
  • 第一作者:卢迎波(1988-),男,硕士,工程师,主要从事稠油与超稠油开发方面的工作。地址:(834000)新疆克拉玛依市克拉玛依区胜利路62号。Email:fcluyb@petrochina.com.cn。
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”（编号： 2016ZX05012）和中国石油股份有限公司重大专项“新疆油田浅层稠油稳产提效技术研究与应用”（编号： 2017E-0408）、“未动用稠油开采新技术研究”（编号： 2019B-1411）、“稠油提高采收率关键技术研究”（编号： 2021DJ1403）联合资助

Formation mechanism and percolation characteristics of secondary foamy oil by gas injection in super heavy oil

LU Yingbo   

  1. Fengcheng Oilfield District, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2022-02-28 Revised:2022-05-23 Online:2022-11-01 Published:2022-11-09

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摘要： 为探索泡沫油在超稠油油藏中的形成机理、渗流特征及驱油效果，采用准噶尔盆地西北缘乌夏断裂带侏罗系齐古组原油及油藏参数，进行注气形成泡沫油介质筛选及原油泡点压力测定实验，并开展注气微观可视化和填砂管驱油实验，深入解析注气形成泡沫油过程中的渗流特征，评价了注气泡沫油驱油效果。研究结果表明：①准噶尔盆地西北缘乌夏断裂带侏罗系齐古组原油泡点压力为9.7 MPa，拟泡点压力随着注气量的增加而增加，随温度的上升而上升，50℃的拟泡点压力随着CO2注入量的增加而增大，压力上升速度较缓，储层具有较好的注气特性。②研究区的泡沫油渗流可分为5个阶段：无气泡阶段、气泡析出阶段、气泡扩张阶段、气泡聚并阶段和气泡消亡阶段。③研究区蒸汽+CO2方式驱油开采过程较纯蒸汽填砂管驱的采收率可提升13.3%，开采过程中随着压力的释放，气泡数目逐渐增多，产油量逐步缓慢上升；当压力降至泡点压力后，气泡数目趋于平稳，形成较稳定的泡沫油，产油量大幅提升，为主力产油期；当压力释放至拟泡点压力后，气泡数目迅速下降，泡沫油逐渐消亡，产油量缓慢下降。

关键词: 超稠油, 泡沫油, 泡点压力, 驱油机理, 渗流特征, 齐古组, 侏罗系, 乌夏断裂带, 准噶尔盆地西北缘

Abstract: In order to explore the formation mechanism， percolation characteristics and displacement effect of foamy oil in super heavy oil reservoir， the oil and reservoir parameters of Jurassic Qigu Formation in Wuxia fault zone in the northwestern margin of Junggar Basin were used to select gas injection medium for foamy oil formation and carry out the testing experiment of bubble point pressure of crude oil. The gas injection microscopic visualization and sand-filling pipe displacement experiments were carried out to analyze the percolation characteristics of foamy oil formed by gas injection， and the oil displacement effect of gas injection foamy oil was evaluated. The results show that： （1）The bubble point pressure of the crude oil of Jurassic Qigu Formation in Wuxia fault zone in the northwestern margin of Junggar Basin is 9.7 MPa. The pseudo-bubble point pressure increases with the increase of gas injection volume and temperature， the pseudo-bubble point pressure at 50 °C increases with the increase of CO2 injection，and the pressure rises slowly. The reservoir has good gas injection characteristics. （2）The flow of foamy oil in the study area can be divided into five stages：no bubble stage， bubble precipitation stage， bubble expansion stage，bubble coalescence stage and bubble extinction stage.（3）The recovery of steam+ CO2 flooding is 13.3% higher than that of pure steam sand-filled pipe flooding. With the release of pressure，the number of bubbles increases gradually， and the oil production increases gradually. When the pressure drops to the bubble point pressure，the number of bubbles tends to be stable and form relatively stable foamy oil，and the oil production increases greatly，which is the main oil production period. When the pressure is released to the pseudobubble point pressure，the number of bubbles will decrease rapidly，the foam oil will disappear gradually，and the oil production will decrease slowly.

Key words: super heavy oil, foamy oil, bubble point pressure, oil displacement mechanism, percolation characteristics, Qigu Formation, Jurassic, Wuxia fault zone, northwestern margin of Junggar Basin

中图分类号: 

  • TE121.3
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