發(fā)布時(shí)間：2018-09-09 17:22

【摘要】：針對(duì)部分水解聚丙烯酰胺(HPAM)與氯化鉻(CrCl_3)的交聯(lián)體系,采用光學(xué)微流變儀,以宏觀黏度因子(MVI)和彈性因子(EI)為評(píng)價(jià)指標(biāo),研究了在不同交聯(lián)劑濃度、pH值、鹽濃度、溫度條件下體系動(dòng)態(tài)成膠的微流變特征。結(jié)果表明,隨著交聯(lián)劑質(zhì)量分?jǐn)?shù)增大、溫度升高、初凍時(shí)間縮短、MVI值和EI值增大,凍膠強(qiáng)度增加;pH=7時(shí)的凍膠最穩(wěn)定,弱堿性環(huán)境下,體系的MVI值和EI值減小,成凍時(shí)間延長(zhǎng)且凍膠強(qiáng)度降低;弱酸性條件下,初凍時(shí)間縮短,但體系易破膠;隨著NaCl濃度的升高,MVI值和EI值減小,初凍時(shí)間縮短凍膠強(qiáng)度降低。此結(jié)果與常規(guī)評(píng)價(jià)方法對(duì)比表明兩者具有一致性。此外,通過(guò)對(duì)體系微觀結(jié)構(gòu)的表征,初步建立了一種原位測(cè)定鉻凍膠體系動(dòng)態(tài)成膠的微流變方法。
[Abstract]:Aiming at the crosslinking system of partially hydrolyzed polyacrylamide (HPAM) and chromium chloride (CrCl_3), using optical microrheometer, macroscopical viscosity factor (MVI) and elastic factor (EI) as evaluation indexes, the pH value and salt concentration of different crosslinking agents were studied. Microrheological characteristics of dynamic gelation at temperature. The results showed that with the increase of the mass fraction of crosslinking agent and the increase of temperature, the initial freezing time shortened the MVI value and EI value, and the gel strength increased with pH = 7. The MVI value and EI value of the system decreased in weak alkaline environment. Freezing time was prolonged and gel strength was decreased, initial freezing time was shortened under weak acid condition, but the gel was easy to break. With the increase of NaCl concentration, MVI value and EI value decreased, the initial freezing time shortened gel strength decreased. The comparison of this result with the conventional evaluation method shows that the two methods are consistent. In addition, a micro-rheological method for the in-situ determination of dynamic gelation of chromium gel system was established by characterizing the microstructure of the system.
【作者單位】： 中國(guó)石油大學(xué)(北京)提高采收率研究院;中國(guó)石油大學(xué)(華東)石油工程學(xué)院;北京朗迪森科技有限公司;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(21273286) 教育部博士點(diǎn)基金(20130133110005)
【分類(lèi)號(hào)】：TE39
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本文編號(hào)：2233065