本文選題：納米二氧化硅 + 硅烷偶聯(lián)劑��； 參考：《中國(guó)石油大學(xué)(華東)》2015年碩士論文

【摘要】：納米液驅(qū)油是一種新興的采油技術(shù),它以水溶液為傳遞介質(zhì),在水中形成幾百個(gè)納米小顆粒,具有很大的比表面積和表面能,使得原油易于剝落成小油滴,而被驅(qū)替液驅(qū)替出來(lái)。另一方面,納米液的顆粒能暫時(shí)堵塞孔道,擴(kuò)大波及體積,使未被波及到的原油驅(qū)替出來(lái)。其中,納米SiO_2驅(qū)油劑因具有良好的剪切增稠觸變性,同時(shí)在減壓增注、封堵孔道方面表現(xiàn)出優(yōu)異的性能而受到廣泛關(guān)注,然而其油容性差,降低油水界面張力幅度小,且能吸附在巖石表面影響巖石的潤(rùn)濕性,因此需進(jìn)行表面修飾改變其性能。本文分別用長(zhǎng)鏈型硅烷偶聯(lián)劑及非離子-陰離子型烷氧基硅烷偶聯(lián)劑改性納米SiO_2,使產(chǎn)物能夠調(diào)控潤(rùn)濕性,降低油水界面張力,提高洗油效率。并得出以下結(jié)論:(1)通過(guò)硅氫加成反應(yīng)合成了一種新型非離子-陰離子型烷氧基硅烷偶聯(lián)劑,轉(zhuǎn)化率可達(dá)91.3%,具有良好的表面活性,可用于納米SiO_2改性以提高表面活性,表面張力可降低至33.8 mN·m-1,對(duì)應(yīng)的CMC為10.96×10-3 g·mL-1,且隨著分子量的增大,臨界表面張力γcmc增大,臨界膠束濃度CMC降低。(2)納米SiO_2改性產(chǎn)物能成功調(diào)控潤(rùn)濕性,改性劑疏水鏈越長(zhǎng),弱親水基團(tuán)越多,產(chǎn)物疏水性越強(qiáng)。且改性產(chǎn)物的潤(rùn)濕性主要受改性濃度調(diào)控,改性濃度越大,潤(rùn)濕性變化越明顯。(3)納米SiO_2改性產(chǎn)物表現(xiàn)出優(yōu)異的界面活性,其中由AEPH300與Si(CH3CH2O)3H硅氫加成反應(yīng)所得產(chǎn)物改性的納米SiO_2降低油水界面張力能力最強(qiáng),低至9.0 mN·m-1,而未改性的納米SiO_2僅為17.4 mNm·-1。(4)在洗油實(shí)驗(yàn)中,由AEPH300與Si(CH3CH2O)3H硅氫加成反應(yīng)所得產(chǎn)物改性的納米SiO_2洗油效果最好,且非離子-陰離子型烷氧基硅烷偶聯(lián)劑改性納米SiO_2的洗油效果整體優(yōu)于長(zhǎng)鏈烷基硅烷偶聯(lián)劑。總之,改性納米SiO_2溶液是一種高效驅(qū)油劑,其潤(rùn)濕性可由接枝基團(tuán)的種類(lèi)、數(shù)目、鏈長(zhǎng)、濃度調(diào)控,油水界面張力可低至9.0 mN·m-1,具備良好的洗油性能。
[Abstract]:Nano-liquid flooding is a new oil recovery technology. It takes aqueous solution as transport medium and forms hundreds of small nanoparticles in water. It has a very large specific surface area and surface energy, which makes crude oil easy to peel into small oil droplets. And the displacing fluid came out. On the other hand, the nanoparticles can temporarily block the pore channel and expand the sweep volume, so that the unaffected crude oil can be driven out. Among them, nanometer SiO_2 flooding agent has attracted wide attention because of its good shear thickening and thixotropy, at the same time, it has excellent performance in increasing injection pressure and sealing pore channels. However, its oil capacity is poor and the amplitude of oil-water interfacial tension is reduced. And adsorption on the rock surface affects the wettability of rock, so surface modification is needed to change its performance. In this paper, nano-SiO2 was modified with long chain silane coupling agent and non-ionic anionic alkoxy silane coupling agent, respectively, which made the product adjust wettability, reduce oil-water interfacial tension and improve oil washing efficiency. The following conclusions are drawn as follows: (1) A new nonionic anion alkoxy silane coupling agent was synthesized by hydrosilylation reaction. The conversion of alkoxy silane can reach 91.3%, and it has good surface activity. It can be used in the modification of nanometer SiO_2 to improve its surface activity. The surface tension can be reduced to 33.8 mm ~ (-1) and the corresponding CMC is 10.96 脳 10 ~ (-3) g mL ~ (-1). With the increase of molecular weight, the critical surface tension 緯 cmc increases, and the critical micelle concentration (CMC) decreases. The more weak hydrophilic groups, the stronger the hydrophobicity of the products. The wettability of the modified product is mainly regulated by the modified concentration. The higher the modified concentration, the more obvious the wettability change is. The nanometer SiO_2 modified by AEPH300 and Si(CH3CH2O)3H hydrosilylation reaction has the strongest ability to reduce the interfacial tension of oil and water, as low as 9.0 mn m-1, while the unmodified nano-SiO_2 is only 17.4 mNm -1.14) in the oil washing experiment. The oil washing effect of nanometer SiO_2 modified by hydrosilylation reaction of AEPH300 and Si(CH3CH2O)3H was the best, and the washing effect of Nonionic alkoxy silane coupling agent modified nano SiO_2 was better than that of long chain alkyl silane coupling agent. In a word, the modified nanometer SiO_2 solution is a kind of high efficiency oil displacement agent. Its wettability can be controlled by the type, number, chain length, concentration of grafted groups, and the interfacial tension of oil and water can be as low as 9.0 mn m -1, which has good oil washing performance.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ127.2;TE39

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