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Performance and enhanced oil recovery efficiency of an acid-resistant polymer microspheres of anti-CO2 channeling in low-permeability reservoirs

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Petroleum Science 2024年第4期21卷 2420-2432页

作者： Hai-Zhuang Jiang Hong-Bin Yang Ruo-Sheng Pan Zhen-Yu Ren Wan-Li Kang Jun-Yi Zhang Shi-Long Pan Bauyrzhan Sarsenbekuly State Key Laboratory of Deep Oil and Gas China University of Petroleum (East China) School of Petroleum Engineering China University of Petroleum (East China) Oil and Gas Engineering Research Institute School of Energy and Petroleum Industry Kazakh-British Technical University

CO2flooding is a vital development method for enhanced oil recovery in low-permeability reservoirs,However,micro-fractures are developed in low-permeability reservoirs,which are essential oil flow channels but can also cause severe CO2gas channeling ***,anti-gas channeling is a necessary measure to improve the effect of *** kind of anti-gas channeling refers to the plugging of fractures in the deep formation to prevent CO2gas channeling,which is different from the wellbore *** microspheres have the characteristics of controllable deep plugging,which can achieve the profile control of low-permeability fractured *** acidic environments with supercritical CO2,traditional polymer microspheres have poor expandability and plugging *** on previous work,a systematic evaluation of the expansion performance,dispersion rheological properties,stability,deep migration,anti-CO2channeling and enhanced oil recovery ability of a novel acid-resistant polymer microsphere（DCNPM-A） was carried out under CQ oilifield conditions（salinity of85,000 mg/L,80℃,pH=3）.The results show that the DCNPM-A microsphere had a better expansion performance than the traditional microsphere,with a swelling rate of *** microsphere dispersion with a concentration of 0.1%-0.5% had the advantages of low viscosity,high dispersion and good injectability in the low permeability fractured *** the acidic environment of supercritical CO2,DCNPM-A microspheres showed excellent stability and could maintain strength for over 60 d with less *** core experiments,DCNPM-A microspheres exhibited delayed swelling characteristics and could effectively plug deep *** a plugging rate of 95%,the subsequent enhanced oil recovery of CO2flooding could reach 21.03%.The experimental results can provide a theoretical basis for anti-CO2channeling and enhanced oil recovery in low-permeability fractured reservoirs.

关键词： Low-permeability reservoir Anti-CO 2 channeling polymer microsphere Acid resistance

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PREPARATION OF polymer microsphereS WITH PYRIDYL GROUP AND THEIR STABILIZED GOLD METALLIC COLLOIDS

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Chinese Journal of polymer Science 2007年第6期25卷 555-563页

作者： Shu-ning Li Xin-lin Yang Wen-qiang Huang Key Laboratory of Functional polymer Materials the Ministry of Education Institute of Polymer Chemistry Nankai University Tianjin 300071 China

Narrow disperse poly（ethyleneglycol dimethacrylate-co-4-vinylpyridine）（poly（EGDMA-co-4-VPy）） microspheres were prepared by distillation-precipitation copolymerization of ethyleneglycol dimethacrylate （EGDMA） and 4-vinylpyridine （4-VPy） with 2,2＇-azobisisobutyronitrile （AIBN） as initiator in neat acetonitrile. The polymer microspheres containing pyridyl group were then utilized as stabilizer for gold metallic colloids with the diameter around 7 nm, which were prepared by the in situ reduction of gold chloride trihydrate with sodium borohydride through the coordination of the pyridyl group on the gel layer and surface of the microsphere with the gold metallic nano-particles. The catalytic properties of the pyridyl- functionalized microsphere-stabilized gold metallic colloids and the behavior of the stabilized-catalyst for the recycling were investigated with reduction of 4-nitrophenol to 4-aminophenol as a model reaction.

关键词： polymer microsphere Distillation-precipitation polymerization Pyridyl group Gold metallic colloids Catalysis.

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An efficient preparation of porous polymeric microspheres by solvent evaporation in foam phase

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Chinese Journal of Chemical Engineering 2021年第1期34卷 409-416页

作者： Yang Yu Guiying Li Wanqing Han Linhua Zhu Tian Si HongWang Yanlin Sun Yanping He Faculty of Chemical Engineering Kunming University of Science and TechnologyChenggong CampusKunming 650504China Faculty of Science Kunming University of Science and TechnologyChenggong CampusKunming 650504China

This paper reports an efficient method of preparing porous polymeric microspheres by solvent evaporation in foam phase,in which phase separation between polymer and porogen occurs in foam phase instead of that in water phase by using the traditional solvent eva poration *** method provides outstanding features,including being time-saving,of high-yield and able for continuous production,in which formation of porous polymeric microspheres finished within 3 min with a high production yield up to approximate 95 wt% and the process was able to be developed into a continuous process for production of porous polymeric *** was also universal to non-crosslinked polymers since the method is a development on the traditional emulsion solvent evaporation *** new method is efficient and can be used potentially on the industrial scale for continuous production of porous polymeric microsphere s.

关键词： Continuous process Foam phase High-yield polymer microsphere Solvent evaporation Time-saving

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高分子微球用于蛋白质药物给药系统:策略、制备及应用

高分子微球用于蛋白质药物给药系统:策略、制备及应用

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2012年全国高分子材料科学与工程研讨会

作者：马光辉中科院过程工程研究所生化工程国家重点实验室

＜正＞蛋白质/多肽药物正在逐步成为一类越来越重要的药物,但是由于其在体内易降解,造成体内半衰期很短,需要频繁注射给药,给患者带来极大的痛苦和经济负担。用高分子微球包埋蛋白质/多肽药物,可保护药物被降解,并可缓慢释放出药物,实... 详细信息

＜正＞蛋白质/多肽药物正在逐步成为一类越来越重要的药物,但是由于其在体内易降解,造成体内半衰期很短,需要频繁注射给药,给患者带来极大的痛苦和经济负担。用高分子微球包埋蛋白质/多肽药物,可保护药物被降解,并可缓慢释放出药物,实现长效注射制剂,通过微球的合理设计还可构建口服制剂。但是,高分子微球作为蛋白质/多肽药物载体仍存在巨大的

关键词： polymer microsphere Protein drug delivery Uniform size Bioactivity Membrane Emulsification

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