本文選題：聚合物體系 + 靜態(tài)吸附　； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：目前,聚合物驅(qū)已經(jīng)作為一種較為成熟的提高原油采收率技術(shù)在我國大多數(shù)油田得到不同程度的推廣。隨著大慶油田聚驅(qū)工業(yè)化區(qū)塊的推廣,到“十三五”期間,每天將有數(shù)萬立方多余的含聚污水無法平衡。針對這個問題,開展了含聚污水配制稀釋聚合物溶液技術(shù)研究,通過這幾年開展的含聚污水配制稀釋聚合物技術(shù)研究,取得了一定的成果,但含聚污水中殘余聚合物對提高采收率的影響規(guī)律還需要進(jìn)一步研究,為此,需要開展含聚污水中殘余聚合物對提高采收率影響機(jī)理的探索性研究。本文首先采用冷凍升華制樣和掃描電鏡,分析了不同組成聚合物溶液中聚合物分子的微觀形態(tài),并分析了分子聚集體結(jié)構(gòu)與驅(qū)油效率的關(guān)系;其次,進(jìn)行了聚合物體系在天然巖心表面的靜態(tài)吸附和動態(tài)滯留研究;第三,測定了不同聚合物體系中分子聚集體水力學(xué)半徑和天然巖心的孔隙大小分布;最后,對“含聚污水中殘余聚合物對聚驅(qū)提高采收率影響機(jī)理”進(jìn)行了分析和總結(jié)當(dāng)污配污稀體系中殘余聚合物達(dá)到一定濃度時(200-400mg/L),對新添加聚合物的分子分布形態(tài)有顯著影響,使聚合物網(wǎng)絡(luò)結(jié)構(gòu)變得致密,使網(wǎng)絡(luò)結(jié)構(gòu)鏈條增粗,從而增加了聚驅(qū)體系對水的束縛,使體系粘度升高、粘彈性增強(qiáng),對提高采收率有利;含殘聚體系在孔隙介質(zhì)中能形成致密且連續(xù)性好的三維網(wǎng)絡(luò)結(jié)構(gòu),對封堵高滲層有利。對殘余聚合物的水解度分析表明,其水解度比新添加聚合物高,具有更多的負(fù)電核基團(tuán),對污水中陽離子的絡(luò)合能力強(qiáng)于新聚合物,降低了陽離子對新添加聚合物的不良影響,間接保護(hù)了新聚合物,從而有利于提高整個體系的粘度和粘彈性,對提高采收率有利。隨著殘余聚合物濃度的升高,整個聚合物體系(含新聚合物)的總吸附量降低,減少了聚合物的吸附損失。
[Abstract]:At present, polymer flooding has been widely used in most oil fields in China as a mature oil recovery technology. With the expansion of the industrialized block of polymer flooding in Daqing Oilfield, tens of thousands of cubic meters of excess sewage will be out of balance every day during the 13th Five-Year Plan period. In order to solve this problem, the technical research on the preparation of dilute polymer solution with polymeric sewage has been carried out, and some achievements have been achieved through the technical research on the preparation of diluted polymer with polymeric sewage in recent years. However, the influence of residual polymer in polymerized sewage on oil recovery still needs to be further studied. Therefore, an exploratory study on the mechanism of residual polymer in polymerized sewage is needed. In this paper, the micromorphology of polymer molecules in different polymer solutions was analyzed by freezing sublimation and scanning electron microscopy, and the relationship between the structure of molecular aggregates and oil displacement efficiency was analyzed. The static adsorption and dynamic retention of polymer systems on the surface of natural cores were studied. Thirdly, the hydrodynamic radius of molecular aggregates and the pore size distribution of natural cores in different polymer systems were measured. The influence mechanism of residual polymer in polymerized sewage on the enhanced recovery factor of polymer flooding was analyzed and summarized. When the residual polymer in waste water system reached a certain concentration, it had a significant effect on the molecular distribution of the newly added polymer. The polymer network structure becomes dense and the network structure chain is thickened, thus increasing the binding of polymer flooding system to water, increasing the viscosity of the polymer flooding system and enhancing the viscoelasticity, which is beneficial to the increase of oil recovery. The residual accumulation system can form a dense and continuous three-dimensional network structure in porous media, which is beneficial to sealing the high permeability layer. The hydrolysis degree of the residual polymer is higher than that of the new added polymer, and it has more negative nuclear groups, and the complexing ability of the cations in sewage is stronger than that of the new polymer, which reduces the adverse effect of the cations on the new added polymers. The new polymer is protected indirectly, which is beneficial to increase the viscosity and viscoelasticity of the whole system. With the increase of the concentration of residual polymer, the total adsorption capacity of the whole polymer system (including new polymer) decreases and the adsorption loss of the polymer decreases.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE357.46

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