Special Oil & Gas Reservoirs >

2023 , Vol. 30 >Issue 2: 142 - 146

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.02.020

Reservoir Engineering

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

  • Wang Yuqi ,
  • Feng Hengzhi ,
  • Xing Xijin ,
  • Wang Qi ,
  • Yue Qiansheng
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  • 1. Yangtze University, Jingzhou, Hubei 434023, China;
    2. CNOOC Research Institute CO., Ltd., Beijing 100101, China

Received date: 2022-05-21

  Revised date: 2022-12-10

  Online published: 2023-05-29

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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

Cite this article

Wang Yuqi , Feng Hengzhi , Xing Xijin , Wang Qi , Yue Qiansheng . Study on the Feasibility of Nanofiltered Seawater Injection in Offshore Medium and Low Permeability Oilfields[J]. Special Oil & Gas Reservoirs, 2023 , 30(2) : 142 -146 . DOI: 10.3969/j.issn.1006-6535.2023.02.020

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