Special Oil & Gas Reservoirs >

2026 , Vol. 33 >Issue 1: 160 - 166

DOI: https://doi.org/10.3969/j.issn.1006-6535.2026.01.019

Drilling & Production Engineering

Preparation and detection methods of a carbon quantum dot-embedded tracer-functional microsphere flooding agent

  • KUAI Jingwen ,
  • JU Ye ,
  • LIU Changlong ,
  • LIU Fenggang ,
  • XU Guorui ,
  • ZHANG Wenxi
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  • 1. State Key Laboratory of Offshore Oil & Gas Exploitation, Beijing 102209, China;
    2. Tianjin Key Laboratory for Exploitation of Difficult-to-Recover Offshore Oil Reserves, Tianjin 300459, China;
    3. CNOOC China Oilfield Services Co., Ltd., Tianjin 300459, China;
    4. CNOOC(China)Co., Ltd.Tianjin Branch, Tianjin 300459, China

Received date: 2024-05-22

  Revised date: 2025-11-07

  Online published: 2026-06-22

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Abstract

To improve the detection sensitivity of polymer microspheres in produced fluids,a tracer-functional microsphere flooding agent embedded with carbon quantum dots,combining profile control and tracer functions,was developed using seed embedding and ionic bond fixation techniques.Its performance was evaluated,and a detection method with high accuracy and short duration was established.The results show that the tracer microsphere flooding agent has excellent transport capability and can form deep plugging in the core;under a permeability of 300.0 mD,the plugging efficiency of the tracer-functional microsphere flooding agent is 88.9%.The developed detection method for the tracer-functional microsphere flooding agent,involving oil-water settling separation,n-hexane washing and separation,and 90 minutes of UV irradiation,achieves a detection time of less than 2 hours.Compared with traditional methods,this approach effectively removes interference from impurities in the produced fluid through the oil-water settling and n-hexane washing separation steps,thereby improving the accuracy of tracer microsphere detection results.These findings enable rapid and efficient monitoring and adjustment of the flooding process,allow evaluation of oil stabilization and water control effects,and provide technical support for efficient oilfield development.

Key words： polymer microspheres; seed embedding; carbon quantum dots(CQDs); flooding agent; tracer; fluorescence intensity

Cite this article

KUAI Jingwen , JU Ye , LIU Changlong , LIU Fenggang , XU Guorui , ZHANG Wenxi . Preparation and detection methods of a carbon quantum dot-embedded tracer-functional microsphere flooding agent[J]. Special Oil & Gas Reservoirs, 2026 , 33(1) : 160 -166 . DOI: 10.3969/j.issn.1006-6535.2026.01.019

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