發(fā)布時間：2018-05-14 23:18

  本文選題：非常規(guī)油氣資源 + 二氧化碳��； 參考：《西南石油大學》2017年碩士論文

【摘要】：針對非常規(guī)油氣儲層的壓裂改造,在大量調(diào)研了國內(nèi)外關(guān)于CO_2壓裂液增稠劑的研究現(xiàn)狀后,設(shè)計合成了一類含氟的增稠劑,用來增稠CO_2,并制備成壓裂液體系。本文以全氟辛酸、絲氨醇、乙醇胺、1,6-己二異氰酸酯以及二碳酸二叔丁酯作為反應原料經(jīng)氨基保護、酯化反應、脫保護和親核加成反應分別得到C02增稠劑SCT、DCT。首先,對絲氨醇、乙醇胺中的氨基上保護基團,起到保護氨基的作用。然后,通過酯化作用,將已從全氟辛酸制備成的全氟辛酰氯引入到N-Boc-絲氨醇和羥乙基氨甲酸叔丁酯中。最后,脫氨基保護后,將產(chǎn)物與1,6-己二異氰酸酯反應得到單鏈、雙鏈增稠劑。其中,采用單因素法優(yōu)化了合成N-Boc-絲氨醇和羥乙基氨甲酸叔丁酯中的投料比,通過正交試驗對酯化反應過程中反應溫度、時間以及投料比進行了優(yōu)化,確定了最佳合成條件。通過FTIR、13C-NMR對中間產(chǎn)物和最終產(chǎn)物進行了結(jié)構(gòu)表征。深入研究增稠劑的熱性能和在CO_2、凝析油、去離子水中的溶解性能。結(jié)果表明:增稠劑DCT、SCT的熱穩(wěn)定性能好,分別在200℃和170℃才發(fā)生熱降解,滿足了現(xiàn)有頁巖氣儲層溫度的需要;通過靜態(tài)法研究了兩種增稠劑在CO_2中的溶解性能,利用Chrastil半經(jīng)驗模型對實驗溶解度進行線性關(guān)聯(lián),單鏈、雙鏈增稠劑的實驗值與理論值的平均相對偏差分別為11.14%和9.52%,線性擬合程度較高,關(guān)聯(lián)性好,表明實驗測量值較為準確;此外,在40℃、60℃和80℃的不同溫度條件下,兩種增稠劑都難溶于凝析油和水中,有利于壓裂后返排和后續(xù)的地面處理�？疾炝撕铣傻玫降脑龀韯┰贑O_2中的增稠效果以及對巖心的傷害率。通過單因素法,對增稠劑的加入量進行了篩選,結(jié)果表明,增稠劑DCT和增稠劑SCT的最佳加入量為2wt%,其將C02的粘度從0.04mPa·s分別提升至1.54mPa·s和1.46mPa.s,增加幅度分別約為39倍和36倍。隨著溫度上升,混合體系的粘度下降,在溫度從30℃升至40℃時,粘度出現(xiàn)上升,后繼續(xù)下降;而體系的粘度隨著壓力值的上升而上升;隨著剪切速率的上升,體系的粘度也隨之下降,屬于一類典型的剪切變稀的假塑性流體;增稠劑DCT和增稠劑SCT對巖心的傷害率都較低,分別為1.43%和1.62%,均遠遠小于常規(guī)的水基壓裂液,能夠滿足"石油與天然氣行業(yè)標準SY/T 6367-2008壓裂液通用技術(shù)條件"的要求。
[Abstract]:In view of fracturing modification of unconventional oil and gas reservoir, a kind of fluorine-containing thickener was designed and synthesized after a large number of researches on thickening agent of CO_2 fracturing fluid at home and abroad, which was used to thicken CO-2 and to form fracturing fluid system. In this paper, perfluorooctanoic acid, sericin, ethanolamine 1-hexadiisocyanate and di-tert-butyl dicarbonate were used as raw materials to obtain C02 thickener SCT _ (DCT) by amino protection, esterification, deprotection and nucleophilic addition respectively. First, protect the amino groups from the amino groups in sericin, ethanolamine, and play the role of protecting amino groups. Then, the perfluorooctanoyl chloride which had been prepared from perfluorooctanoic acid was introduced into N-Boc-serine and hydroxyethyl carbamate tert-butyl ester by esterification. Finally, after deamination protection, the product was reacted with 1% hexane diisocyanate to form a single chain and double chain thickener. Single factor method was used to optimize the feed ratio of N-Boc-serine and hydroxyethyl carbamate tert-butyl ester. The reaction temperature, time and feed ratio were optimized by orthogonal test, and the optimum synthesis conditions were determined. The intermediate and final products were characterized by FTIR 13C-NMR. The thermal properties of thickener and its solubility in CO2, condensate and deionized water were studied. The results show that the thermal stability of thickener DCT / SCT is good, and thermal degradation occurs at 200 鈩，

本文編號：1889920