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

doi:10.3969/j.issn.1006-6535.2026.01.019

Abstract

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

CLC Number:

TQ317.9

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.

References

[1] 刘义刚,夏欢,代磊阳,等.分散型调驱体系与储层渗透率适应性——以渤海B油田为例[J].大庆石油地质与开发,2021,40(4):107-118.
LIU Yigang,XIA Huan,DAI Leiyang,et al.Adaptability of dispersed profile control and flooding system to reservoir permeability:taking Bohai B Oilfield as an example[J].Petroleum Geology & Oilfield Development in Daqing,2021,40(4):107-118.
[2] 华科良,王晓超,张志军,等.边水水平井开发油藏调剖效果影响研究[J].非常规油气,2024,11(2):92-98.
HUA Keliang,WANG Xiaochao,ZHANG Zhijun,et al.Study on influencing factors of profile control effect of horizontal well development reservoir with edge water[J].Unconventional Oil & Gas,2024,11(2):92-98.
[3] YANG H B,KANG W L,WU H R,et al.Stability,rheological property and oil-displacement mechanism of a dispersed low-elastic microsphere system for enhanced oil recovery[J].RSC Advances,2017,7(14):8118-8130.
[4] YANG H B,KANG W L,YU Y,et al.A new approach to evaluate the particle growth and sedimentation of dispersed polymer microsphere profile control system based on multiple light scattering[J].Powder Technology,2017,315:477-485.
[5] 路建萍,沈燕宾,王佳,等.纳米微球技术在油田领域的研究进展及应用[J].应用化工,2020,49(3):768-772.
LU Jianping,SHEN Yanbin,WANG Jia,et al.Research progress and application of nanosphere technology in oilfield[J].Applied Chemical Industry,2020,49(3):768-772.
[6] 徐哲,孙金声,刘敬平,等.柔性微球封堵剂的封堵性能及机理研究[J].断块油气田,2024,31(6):1105-1113,1121.
XU Zhe,SUN Jinsheng,LIU Jingping,et al.Research on plugging performance and mechanism of flexible microsphere plugging agent[J].Fault-Block Oil & Gas Field,2024,31(6):1105-1113,1121.
[7] 宋兆辉.树莓状聚合物纳微米封堵剂的制备及性能评价[J].石油钻探技术,2024,52(3):84-90.
SONG Zhaohui.Preparation and performance evaluation of raspberry-like polymer nano-micro plugging agent[J].Petroleum Drilling Techniques,2024,52(3):84-90.
[8] 刘进祥,代磊阳,李先杰,等.Z1型聚合物微球的油藏适应性及调驱效果[J].石油化工,2020,49(12):1194-1200.
LIU Jinxiang,DAI Leiyang,LI Xianjie,et al.Reservoir adaptability and control flooding effect of Z1-type polymer microspheres[J].Petrochemical Technology,2020,49(12):1194-1200.
[9] 唐晓旭,高建崇,王秋霞,等.耐温抗盐高效聚合物微球性能评价与应用效果[J].油田化学,2022,39(3):425-430.
TANG Xiaoxu,GAO Jianchong,WANG Qiuxia,et al.Performance evaluation and application effect of high efficiency polymer microsphere with temperature and salt resistance[J].Oilfield Chemistry,2022,39(3):425-430.
[10] 赵华强,彭勃.聚合物微球在油田深部调驱技术中的研究进展[J].化工进展,2021,40(增刊2):75-80.
ZHAO Huaqiang,PENG Bo.Research progress of polymer microspheres in deep oil field control and displacement technology[J].Chemical Industry and Engineering Progress,2021,40(S2):75-80.
[11] 陈世军,潘智杰,杨继刚,等.新型低界面张力纳米微球调驱剂的合成与性能研究[J].西安石油大学学报(自然科学版),2024,39(2):62-69.
CHEN Shijun,PAN Zhijie,YANG Jigang,et al.Synthesis and performance study of a new type of low interfacial tension nano microsphere profile-control oil-displacement agent[J].Journal of Xi'an Shiyou University (Natural Science Edition),2024,39(2):62-69.
[12] 杨开吉,张颖,魏强,等.海上油田开发用抗温抗盐乳液聚合物研制与性能评价[J].石油钻探技术,2024,52(4):118-127.
YANG Kaiji,ZHANG Ying,WEI Qiang,et al.Development and performance evaluation of emulsion polymer with temperature resistance and salt resistance used in offshore oilfield development[J].Petroleum Drilling Techniques,2024,52(4):118-127.
[13] 左灵,戴彩丽,马世英,等.聚合物驱产出液中疏水缔合聚合物质量浓度测定[J].油田化学,2010,27(2):171-173.
ZUO Ling,DAI Caili,MA Shiying,et al.Deter mination of hydrophobic associating polymer concentration in produced fluids from polymer flooding reservoir[J].Oilfield Chemistry,2010,27(2):171-173.
[14] 陈彬,何焕杰,王永红.几种水解聚丙烯酰胺及其相似物浓度测定方法分析[J].钻井液与完井液,2005,22(3):66-69.
CHEN Bin,HE Huanjie,WANG Yonghong.Research on methods for deter mination of concentration of HPAM and its similar material in aqueous solutions[J].Drilling Fluid & Completion Fluid,2005,22(3):66-69.
[15] 朱怀江,蔡玉娥,魏莹璐,等.紫外光谱法测定提高采收率用新型聚合物浓度[J].精细与专用化学品,2004,12(6):63-66.
ZHU Huaijiang,CAI Yu'e,WEI Yinglu,et al.Concentration measurement of novel water-soluble polymers used in EOR with ultraviolet spectroscopy[J].Fine and Specialty Chemicals,2004,12(6):63-66.
[16] 刘义刚,徐国瑞,鞠野,等.紫外分光光度法测定聚合物微球产出液浓度[J].科学技术与工程,2015,15(17):145-149.
LIU Yigang,XU Guorui,JU Ye,et al.Deter mination of polymer microspheres concentration in the produced fluid by UV spectrophotometry[J].Science Technology and Engineering,2015,15(17):145-149.
[17] 易萍,周广卿,王石头,等.纳米聚合物微球调驱封堵机理及现场试验[J].西安石油大学学报(自然科学版),2018,33(3):86-91.
YI Ping,ZHOU Guangqing,WANG Shitou,et al.Profile control mechanism and field test of nano polymer microspheres[J].Journal of Xi'an Shiyou University(Natural Science Edition),2018,33(3):86-91.
[18] 王伟吉,邱正松,黄维安,等.纳米聚合物微球封堵剂的制备及特性[J].钻井液与完井液,2016,33(1):33-36.
WANG Weiji,QIU Zhengsong,HUANG Weian,et al.Preparation and characteristics of nano polymer microspheres used as plugging agent in drilling fluid[J].Drilling Fluid & Completion Fluid,2016,33(1):33-36.
[19] 孟令韬,王彦玲,许宁,等.一种低渗油藏深部调驱用聚合物纳米微球的制备与性能研究[J].应用化工,2021,50(7):1757-1760.
MENG Lingtao,WANG Yanling,XU Ning,et al.Study on preparation and performance of polymer nanospheres for deep profile control and flooding in low permeability reservoir[J].Applied Chemical Industry,2021,50(7):1757-1760.
[20] 程增会,张代晖,王基夫,等.单分散聚合物微球的制备及功能化研究进展[J].应用化工,2021,50(10):2822-2828.
CHENG Zenghui,ZHANG Daihui,WANG Jifu,et al.Research progress in preparation and functionalization of monodisperse polymer microspheres[J].Applied Chemical Industry,2021,50(10):2822-2828.