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Potential of alkaline flooding to enhance heavy oil recovery through water-in-oil emulsification

机译：碱驱油通过油包水乳化提高重油采收率的潜力

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摘要

Alkaline flooding has great potential for enhancing the recovery of heavy oil, especially for reservoirs in which thermal methods are not suitable. In this study, alkaline flooding tests were performed in micro-models and sandpacks to investigate the microscopic displacement mechanisms for enhancing heavy oil recovery and the effect of the injection parameters on displacement efficiency. The micromodel tests indicate that the penetration of the alkaline solution into the crude oil and the subsequent formation of a water-in-oil (W/O) emulsion reduce the mobility of the water phase and divert the injected water into the unswept region, thereby improving the sweep efficiency. The sandpack flood results show that the tertiary oil recovery can reach about 20% of the initial oil in place (IOIP) using 1.0% NaOH, and the tertiary oil recovery has been found to increase as the alkaline concentration increases. However, there is an optimum slug size and injection rate at which the highest tertiary oil recovery can be obtained during the alkaline flooding process. Continuous alkaline injection can provide a higher tertiary oil recovery compared with a cyclic alkaline injection pattern. These results show that the alkaline flooding, if properly designed and controlled, can lead to enhanced heavy oil recovery through the water-in-oil emulsification.
机译：碱性驱油具有提高重油采收率的巨大潜力，特别是对于不适合采用热法的油藏。在这项研究中，在微型模型和沙包中进行了碱性驱油测试，以研究提高稠油采收率的微观驱替机理以及注入参数对驱替效率的影响。微观模型测试表明，碱性溶液渗透到原油中并随后形成油包水（W / O）乳液会降低水相的迁移率，并将注入的水转移到未清扫的区域，从而提高扫描效率。沙堆洪水结果表明，使用1.0％NaOH可以使三次采油量达到初始初始采油量（IOIP）的20％，并且发现随着碱性浓度的增加，三次采油量也将增加。但是，在碱性驱油过程中，有一个最佳的段塞尺寸和注入速率，可以在该速率下获得最高的三次采油率。与循环碱注入方式相比，连续碱注入可以提供更高的三次采油率。这些结果表明，如果适当地设计和控制碱驱，则可以通过油包水乳化来提高重油采收率。

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  • 来源
    《Fuel》 |2013年第2期|284-293|共10页
  • 作者

    Haihua Pei; Guicai Zhang; Jijiang Ge; Luchao Jin; Chao Ma;

  • 作者单位

    College of Petroleum Engineering, China University of Petroleum, Qingdao 266555, People's Republic of China;

    College of Petroleum Engineering, China University of Petroleum, Qingdao 266555, People's Republic of China,State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, People's Republic of China;

    College of Petroleum Engineering, China University of Petroleum, Qingdao 266555, People's Republic of China;

    College of Petroleum Engineering, China University of Petroleum, Qingdao 266555, People's Republic of China;

    College of Petroleum Engineering, China University of Petroleum, Qingdao 266555, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    alkaline flooding; W/O emulsion; sweep efficiency; sandpack flood test; enhanced heavy oil recovery;

    机译：碱性驱油W / O乳液;扫频效率沙袋洪水测试;提高重油采收率;

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