特种油气藏 ›› 2023, Vol. 30 ›› Issue (2): 142-146.DOI: 10.3969/j.issn.1006-6535.2023.02.020

• 油藏工程 • 上一篇    下一篇

海上中低渗油田注纳滤海水可行性研究

王宇琪1, 冯恒榰2, 邢希金2, 王齐1, 岳前升1   

  1. 1.长江大学,湖北 荆州 434023;
    2.中海油研究总院有限责任公司,北京 100101
  • 收稿日期:2022-05-21 修回日期:2022-12-10 出版日期:2023-04-25 发布日期:2023-05-29
  • 通讯作者: 岳前升(1973—),男,教授,1996年毕业于江汉石油学院石油地质专业,2009年毕业于武汉理工大学材料专业,获博士学位,现从事油气田应用化学方面研究工作。
  • 作者简介:王宇琪(1999—),女,2021年毕业于湖南科技大学环境工程专业,现为长江大学环境科学与工程专业在读硕士研究生,主要从事油气田水处理方面研究工作。
  • 基金资助:
    中海油ODP项目“陆丰油田群二期开发储层敏感性及注水配伍性实验”(CCL2021RCPS0416PSN)

Study on the Feasibility of Nanofiltered Seawater Injection in Offshore Medium and Low Permeability Oilfields

Wang Yuqi1, Feng Hengzhi2, Xing Xijin2, Wang Qi1, Yue Qiansheng1   

  1. 1. Yangtze University, Jingzhou, Hubei 434023, China;
    2. CNOOC Research Institute CO., Ltd., Beijing 100101, China
  • Received:2022-05-21 Revised:2022-12-10 Online:2023-04-25 Published:2023-05-29

摘要: 针对天然海水作为注入水源损害储层的问题,从水样离子组成、与地层水混合后结垢趋势预测、结垢程度以及岩心流动实验等方面研究了天然海水和纳滤海水作为注入水的差异性,探讨纳滤海水作为海上油田注入水源的可行性。研究结果表明:纳滤海水的Ca2+、Mg2+和SO42-等成垢离子含量较天然海水大幅降低;纳滤海水、天然海水分别与地层水混合后均有结垢趋势,但纳滤海水与地层水混合后的结垢量明显低于天然海水,同时纳滤海水作为注入水对储层岩心液相渗透率的损害程度也明显低于天然海水;纳滤海水作为海上油气田注入水在技术上是可行的。研究结果为海上油田采用纳滤海水作为注入水源提供技术依据。

关键词: 注水, 配伍性, 纳滤海水, 储层保护, 海上油田

Abstract: To address the problem that the natural seawater as the injected water source damages the reservoir, the differences between the natural seawater and the nanofiltered seawater as the injected water were studied in terms of ionic composition of water samples, prediction of scaling tendency after mixing with the formation water, degree of scaling and core flow test to explore the feasibility of the nanofiltered seawater as the injected water source in offshore oilfields. The results of the study show that the content of scale forming ions such as Ca2+, Mg2+ and SO42- in the nanofiltered seawater is significantly lower than that of the natural seawater; both the nanofiltered seawater and the natural seawater have scaling tendency after mixing with the formation water respectively, but the amount of scaling after the nanofiltered seawater is mixed with the formation water is significantly lower than that of the natural seawater, and the damage of the nanofiltered seawater as injected water to the liquid phase permeability of reservoir core is also significantly lower than that of the natural seawater. Therefore, the nanofiltered seawater as the injected water for offshore oil and gas fields is technically feasible. The results of the study provide a technical basis for the use of the nanofiltered seawater as the injected water in offshore oilfields.

Key words: water injection, compatibility, nanofiltered seawater, reservoir protection, offshore oilfield

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