本文選題：疏水改性聚合物 + 蠕蟲狀膠束　； 參考：《西南石油大學》2015年碩士論文

【摘要】：疏水改性聚合物與蠕蟲狀膠束自組裝體系由于其優(yōu)良的粘彈性而逐漸受到關注。但目前對高蠕蟲狀膠束濃度、低聚合物濃度的自組裝體系的溶液性質以及疏水改性聚丙烯酰胺(HMPAM)的結構對其與蠕蟲狀膠束自組裝效應的影響還缺乏研究。因此本論文對這兩個方面進行了研究,進一步加深了對疏水改性聚合物與蠕蟲狀膠束自組裝體系性質的認識�；谧越M裝體系優(yōu)良的粘彈性和烴類響應性,本論文考察了其作為壓裂液應用的相關性能,以期獲得一種性能更優(yōu)的新型低傷害壓裂液。 本論文以表面活性疏水單體與丙烯酰胺通過自由基膠束共聚合制備了疏水改性聚丙酰胺,并與20mmol/L十六烷基三甲基溴化銨-水楊酸鈉蠕蟲狀膠束構建了自組裝體系；通過流變學方法考察了自組裝體系的溶液行為以及HMPAM分子結構對其與蠕蟲狀膠束自組裝效應的影響；最后構建了自組裝壓裂液體系,按照行業(yè)標準考察了其相關性能。 研究結果表明：隨HMAPM濃度增大,自組裝體系粘彈性增強,但彈性模量的比例卻逐漸下降,流變性也逐漸偏離Maxwell模型。自組裝體系具有良好的“剪切稀釋-恢復”性,對溫度和剪切更敏感；但自組裝體系中具有更密集的網(wǎng)絡結構,在相同剪切速率和溫度下仍具有更高的粘度。煤油促使蠕蟲狀膠束向球形膠束轉變,能夠完全破壞自組裝網(wǎng)絡結構；正己醇使蠕蟲狀膠束轉變?yōu)槟遗?HMPAM與囊泡之間也能形成網(wǎng)絡結構,使體系仍具有一定粘彈性。 線性HMPAM的分子尺寸達到與蠕蟲狀膠束形成“有效交聯(lián)”的要求后,將不再明顯影響自組裝體系的網(wǎng)絡密度,但聚合物分子量越大,自組裝體系流變性偏離Maxwell模型的程度越高。隨線性HMPAM分子中疏水側鏈含量增加,自組裝體系網(wǎng)絡密度逐漸增大；但含量過高時,疏水側鏈與蠕蟲狀膠束中形成“無效交聯(lián)”的概率增大,網(wǎng)絡密度反而下降。減小線性HMPAM分子中疏水側鏈的微嵌段長度、增大疏水側鏈碳鏈長度以及提高HMPAM的支化度均有利于增強自主裝效應。 自組裝壓裂液比常規(guī)清潔壓裂液的耐溫性高20-30℃；自組裝壓裂液遇烴類同樣能徹底破膠,破膠液巖心傷害率與常規(guī)清潔壓裂液接近,因此也是一種低傷害壓裂液;相比常規(guī)清潔壓裂液,自組裝壓裂液中表面活性劑用量低,具有控制成本和降低潛在地層及環(huán)境傷害的優(yōu)勢。
[Abstract]:Hydrophobic modified polymers and wormlike micelle self-assembly systems have attracted more and more attention due to their excellent viscoelasticity. However, the effects of the solution properties of high wormlike micelle concentration, low polymer concentration and hydrophobic modified polyacrylamide (HMPAM) on the effect of helminoid micelle self-assembly have not been studied. Therefore, these two aspects are studied in this paper, and the properties of hydrophobic modified polymer and worm-like micelle self-assembly system are further understood. Based on the excellent viscoelasticity and hydrocarbon responsiveness of the self-assembled system, this paper investigates its application as fracturing fluid, in order to obtain a new type of low-damage fracturing fluid with better performance. In this paper, hydrophobic modified polyacrylamide was prepared by free radical micelle copolymerization of hydrophobic monomer and acrylamide, and self-assembled system was constructed with 20 mmol / L cetyltrimethylammonium bromide and sodium salicylate worm-like micelle. The solution behavior of the self-assembled system and the effect of the molecular structure of HMPAM on the self-assembly effect of the worm-like micelle were investigated by rheological method. Finally, the self-assembled fracturing fluid system was constructed, and the properties of the self-assembled fracturing fluid were investigated according to the industry standard. The results show that the viscoelasticity of self-assembled system increases with the increase of HMAPM concentration, but the ratio of elastic modulus decreases gradually, and the rheological property deviates from Maxwell model. The self-assembly system has a good "shear dilution and recovery" property and is more sensitive to temperature and shear, but the self-assembly system has a more dense network structure and higher viscosity at the same shear rate and temperature. Kerosene can promote the transformation of worm micelles to spherical micelles, which can completely destroy the self-assembled network structure, and n-hexanol can transform the wormlike micelles into vesicles between HMPAM and vesicles, so that the system still has a certain viscoelasticity. When the molecular size of the linear HMPAM reaches the requirement of "effective crosslinking" with the worm micelles, the network density of the self-assembled system will no longer be significantly affected, but the larger the molecular weight of the polymer, the higher the rheological variation of the self-assembled system deviates from the Maxwell model. With the increase of hydrophobic side chain content in the linear HMPAM molecule, the network density of the self-assembled system increases gradually, but when the content is too high, the probability of forming "ineffective crosslinking" between the hydrophobic side chain and the worm-like micelle increases and the network density decreases. Decreasing the microblock length of hydrophobic side chain, increasing the carbon chain length of hydrophobic side chain and increasing the branching degree of HMPAM can enhance the self-assembly effect. The self-assembled fracturing fluid is 20-30 鈩，

本文編號：2057225