岩性油气藏 ›› 2014, Vol. 26 ›› Issue (3): 125–130.doi: 10.3969/j.issn.1673-8926.2014.03.021

• 油气田开发 • 上一篇    

抗垢碱提高稠油采收率机理研究

汤明光1,刘清华1,张贵才2,陈立峰2   

  1. 1.中海石油(中国)有限公司湛江分公司,广东 湛江 524057; 2.中国石油大学(华东) 石油工程学院,山东 青岛 266580
  • 出版日期:2014-06-06 发布日期:2014-06-06
  • 作者简介:汤明光(1986-),男,硕士,主要从事油田化学与提高采收率方面的研究工作。 地址:(524057)广东省湛江市坡头区中海油湛江分公司研究院商业楼。 E-mail:tangguang119@163.com。
  • 基金资助:

    国家自然科学基金项目“化学驱油体系油水界面流变性及其对毛管数模型作用机制研究”(编号:51104170)与霍英东教育基金会 资助项目“稠油油藏表面活性剂驱技术研究”(编号:114016)联合资助

Study on enhancing heavy oil recovery mechanism of antiscaling alkali

TANG Mingguang1, LIU Qinghua1, ZHANG Guicai2, CHEN Lifeng2   

  1. 1. Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, Guangdong, China; 2. College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
  • Online:2014-06-06 Published:2014-06-06

摘要:

针对胜利油田夏八区块稠油油藏地层水钙镁离子浓度高,使用常规碱剂如氢氧化钠和碳酸钠等 进行驱油均会产生结垢问题,开展了具有抗垢作用的驱油用碱研究。 选用具有良好耐垢性能的偏硼酸钠 (NaBO2)进行了室内研究,并使用填砂管驱替实验评价了其驱油效果。 结果表明:虽然 NaBO2溶液降低油 水界面张力的效果不好,但其驱油效果较好。 驱替过程中,在较高的碱溶液浓度下出现了大的压差响应, 且提高采收率的幅度随着碱溶液浓度的增加而增大。 NaBO2溶液提高稠油采收率的微观机理为:碱溶液 易侵入原油中并形成分散液滴,这些液滴随即转变为 W/O 型乳状液,封堵高渗流通道,抑制黏性指进,从 而提高波及系数。

关键词: 低渗透, 成岩作用, 非均质性, 鄂尔多斯盆地

Abstract:

The content of calcium and magnesium ions in the formation water in Xiaba block is relatively high, so scaling problem will occur when use conventional alkali agent such as sodium hydroxide and sodium carbonate. This paper investigated the alkaline which has antiscaling effect, and chose NaBO2 which has strong chelating capacity for calcium and magnesium ions to do indoor research and used sandpacks to evaluate its displacement efficiency. The results show that although the dynamic interfacial tension is high, the displacement efficiency during the sandpacks tests is good. During the displacement process, a large differential pressure response appeared when the alkali concentration is high, and the incremental oil recovery increased with the increase of alkali concentration. Microscopic mechanism shows that the alkaline solution penetrates into the crude oil to form water drops inside the oil phase, and those water drops turn into W/O emulsions subsequently, which could block the water channel and inhibit the viscous fingering, leading to the improvement of sweep efficiency.

Key words:  , low permeability; diagenesis; heterogeneity; Ordos Basin

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