无碱中相复合驱体系实验

doi:10.7623/syxb202307010

石油学报 ›› 2023, Vol. 44 ›› Issue (7): 1140-1150.DOI: 10.7623/syxb202307010

无碱中相复合驱体系实验

韩旭¹, 王正茂², 姜国庆³, 阎逸群¹, 黄佳¹, 李思源¹, 周小松⁴, 谭效党¹

1. 中国石油勘探开发研究院北京 100083;
2. 中国石油勘探与生产分公司北京 100007;
3. 大庆油田有限责任公司勘探开发研究院黑龙江大庆 163712;
4. 大庆油田有限责任公司第六采油厂黑龙江大庆 163000

收稿日期:2021-07-11 修回日期:2022-08-31 出版日期:2023-07-25 发布日期:2023-08-08
通讯作者: 阎逸群,女,1991年1月生,2016年获中国石油大学(北京)油气田开发工程专业硕士学位,现为中国石油勘探开发研究院致密油研究所工程师,主要从事油田开发工作。Email:yanyiqun@petrochina.com.cn
作者简介:韩旭,男,1989年10月生,2020年获美国新墨西哥矿业技术学院材料工程专业博士学位,现为中国石油勘探开发研究院提高采收率研究中心工程师,主要从事油田化学驱提高采收率研究工作。Email:hanxu05@petrochina.com.cn
基金资助:
中国博士后科学基金项目（2021M693509）资助。

Experiment of alkali-free composite oil displacement system with middle-phase microemulsion

Han Xu¹, Wang Zhengmao², Jiang Guoqing³, Yan Yiqun¹, Huang Jia¹, Li Siyuan¹, Zhou Xiaosong⁴, Tan Xiaodang¹

1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
2. PetroChina Exploration and Production Company, Beijing 100007, China;
3. Exploration and Development Research Institute, Daqing Oilfield Company Limited, Heilongjiang Daqing 163712, China;
4. No. 6 Oil Production Plant, Daqing Oilfield Company Limited, Heilongjiang Daqing 163000, China

Received:2021-07-11 Revised:2022-08-31 Online:2023-07-25 Published:2023-08-08

摘要/Abstract

摘要： 目前，大庆油田以界面张力测量为主的驱油体系评价方法所筛选的碱/表面活性剂/聚合物（ASP）三元复合驱体系不能与原油形成中相微乳液，驱油效率低。同时，由于体系中碱的存在导致管线、泵易产生腐蚀、结垢和采出液出现乳化严重破乳难等问题。针对上述问题，优选了两种高效稳定的表面活性剂工业产品（脂肪醇聚氧丙烯醚硫酸盐-AES和烷基苯磺酸盐-ABS），按质量比1：1复配，并在驱油体系中采用盐（NaCl）代替碱（Na₂CO₃）开展相态实验。相态实验结果表明，NaCl-AES/ABS和Na₂CO₃-AES/ABS两种驱油体系与大庆原油混合后均可形成中相微乳液。贝雷岩心驱油实验结果表明，在最佳含盐量条件下，NaCl-AES/ABS-部分水解聚丙烯酰胺（HPAM）驱油体系可比水驱提高采收率44.6%（以原油地质储量计），最终采收率达83.3%，Na₂CO₃-AES/ABS-HPAM驱油体系可比水驱提高采收率43.1%，最终采收率为82.9%，两者提高采收率幅度基本相当。NaCl-AES/ABS/HPAM驱油体系可比大庆油田在用的Na₂CO₃-石油磺酸盐（PS）-HPAM驱油体系提高采收率23.2%。同时，驱油体系中采用NaCl代替了Na₂CO₃，避免了碱的负面作用。

关键词: 无机盐, 碱, 表面活性剂, 相行为, 中相微乳液, 驱油体系, 驱油效果

Abstract: At present, in Daqing Oilfield, the oil displacement method used for alkali/surfactant/polymer (ASP) flooding was based on interfacial tension measurement, which fails to form middle-phase microemulsion and leads to low oil displacement efficiency. Meanwhile, the existence of alkali in the ASP flooding system can cause many serious issues such ascorrosion and scaling of pipelines and pumps, semulsification of the produced liquid, and difficulty in demulsification. To aim the problems rised in the oil displacement system, two highly efficient and stable commercial surfactants (AES and ABS) were selected and compounded at a mass ratio of 1:1 for phase behavior experiment, wherein inorganic salt (NaCl) was used instead of alkali (Na₂CO₃). The results show that both NaCl-AES/ABS and Na₂CO₃-AES/ABS oil displacement systems can form middle-phase microemulsion together with Daqing crude oil. The experiment of oil displacement in Berea cores show that in the condition of optimal salinity, NaCl-AES/ABS-HPAM oil displacement system can increase the oil recovery efficiency by 44.6% OOIP over water flooding, and the final recovery efficiency reach to 83.3%; Na₂CO₃-AES/ABS-HPAM oil displacement system can increase the oil recovery efficiency by 43.1% OOIP over water flooding, and the final recovery efficiency reach to 82.9%. Those reuslts has proven that the enhanced oil recovery (EOR) of the two oil displacement systems are nearly equal. NaCl-AES/ABS-HPAM oil displacement system can increase the oil recovery efficiency by 23.2% OOIP higher than Na₂CO₃-petroleum sulfonate (PS)-HPAM oil displacement system currently used in Daqing oilfield. Moreover, the use of NaCl instead of Na₂CO₃ in NaCl-AES/ABS-HPAM oil displacement system can avoid the negative effects of alkali.

Key words: inorganic salt, alkali, surfactant, phase behavior, middle-phase microemulsion, oil displacement system, oil displacement efficiency

中图分类号:

TE357.4

韩旭, 王正茂, 姜国庆, 阎逸群, 黄佳, 李思源, 周小松, 谭效党. 无碱中相复合驱体系实验[J]. 石油学报, 2023, 44(7): 1140-1150.

Han Xu, Wang Zhengmao, Jiang Guoqing, Yan Yiqun, Huang Jia, Li Siyuan, Zhou Xiaosong, Tan Xiaodang. Experiment of alkali-free composite oil displacement system with middle-phase microemulsion[J]. Acta Petrolei Sinica, 2023, 44(7): 1140-1150.

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无碱中相复合驱体系实验

Experiment of alkali-free composite oil displacement system with middle-phase microemulsion

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