本文關(guān)鍵詞：聚醋酸乙烯酯及兩親性表面活性劑對二氧化碳增稠作用的研究　出處：《華東理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 四臂聚醋酸乙烯酯 粘度 表面活性劑 乳液 微乳液

【摘要】：采用超臨界二氧化碳(scCO_2)作為壓裂液可以有效提高油氣采收率,然而由于其較低的粘度,在驅(qū)油時(shí)容易產(chǎn)生粘性指進(jìn)和氣竄現(xiàn)象,因而需要增加其粘度。本文采用偶氮二異丁腈作為引發(fā)劑,采用可逆加成-斷裂-鏈轉(zhuǎn)移(RAFT)聚合合成了不同分子量的四臂聚醋酸乙烯酯(PVAc),并采用高壓落球粘度計(jì)研究了以乙醇為共溶劑的條件下,不同分子量以及不同濃度的四臂PVAc對CO_2的增稠效果,在四臂PVAc濃度為1.0 wt%,乙醇濃度為5.0 wt%時(shí),其對CO_2粘度提升幅度為31%～55%。分別利用表面活性劑聚乙二醇三甲基壬基醚(TMN-6)和全氟聚醚(PFPE)構(gòu)建了 CO_2/水乳液和水/CO_2微乳液,對其粘度進(jìn)行了測定。結(jié)果表明,穩(wěn)定的CO_2/水乳液體系,其粘度相較于CO_2甚至水的粘度均有很大提高。在25～40℃、10～25MPa、mH2O/mCO_2介于2:8～5:5,表面活性劑含量為0.2～1.5 wt%的條件下,乳液體系的粘度介于3.78～13.20 mPa·s,為水的5～15倍;且乳液體系的粘度隨表面活性劑TMN-6濃度的增加、CO_2壓力的升高、溫度的降低以及mH2O/mCO_2的增加而有不同程度的增大。論文還比較了不同表面活性劑濃度下乳液的流動(dòng)活化能Ea*和流動(dòng)活化體積V*,結(jié)果表明,隨著表面活性劑濃度的增加,CO_2/水乳液體系粘度與溫度、壓力的相關(guān)性也逐漸增加。相比于乳液體系,水/CO_2微乳液對CO_2粘度提升幅度并不明顯。
[Abstract]:Supercritical carbon dioxide (scCO_2) is used as fracturing fluid to improve oil and gas recovery. However, because of its low viscosity, viscous fingering and gas channeling are prone to occur during oil displacement, so viscosity is needed. This paper uses two azo isobutyronitrile as initiator by reversible addition fragmentation chain transfer polymerization (RAFT) of different molecular weight four arm poly vinyl acetate synthesis (PVAc), and the use of high voltage falling ball viscometer was studied with ethanol as co solvent under the condition of different molecular weight and different concentration of four arm PVAc to CO_2 thickening effect, in the four arm PVAc concentration was 1 wt%, the ethanol concentration was 5 wt%, the viscosity of CO_2 increase from 31% to 55%. CO_2/ water emulsion and water /CO_2 microemulsion were prepared by using surfactant, polyethylene glycol three methyl nonyl ether (TMN-6) and perfluorinated polyether (PFPE) respectively, and their viscosity was determined. The results show that the viscosity of the stable CO_2/ water emulsion system is greatly improved compared with the viscosity of CO_2 and even the water. In 25 ~ 40 DEG C, 10 ~ 25MPa, mH2O/mCO_2 from 2:8 to 5:5, the surfactant content is 0.2 ~ 1.5 wt%, the viscosity of emulsion is between 3.78 ~ 13.20 mPa - s, water 5 to 15 times; and the increase of the viscosity of emulsion system with surfactant, the concentration of TMN-6 CO_2 the increase of pressure, the decrease of temperature and the increase of mH2O/mCO_2 increases. The flow activation energy Ea* and flow activation volume V* of emulsion under different surfactant concentrations were compared. The results showed that the correlation between viscosity and temperature and pressure of CO_2/ aqueous emulsion increased with the increase of surfactant concentration. Compared with the emulsion system, the viscosity of water /CO_2 microemulsion has no obvious increase in the viscosity of CO_2.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE357.7;TQ116.3

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