表面活性劑提高致密油藏滲吸采收率研究
本文關(guān)鍵詞: 表面活性劑 致密油藏 潤(rùn)濕性 界面張力 滲吸機(jī)理 出處:《油田化學(xué)》2016年04期 論文類型:期刊論文
【摘要】:為了明確表面活性劑改變巖石潤(rùn)濕性及降低界面張力的特性對(duì)致密油藏滲吸采油的作用效果,獲得表面活性劑滲吸采油的有利條件,通過測(cè)量巖心接觸角和表面活性劑溶液與油間的界面張力,研究了3種常用表面活性劑重烷基苯石油磺酸鹽(ZPS)、十二烷基苯磺酸鹽(SDBS)和磺基甜菜堿(SB)對(duì)致密巖心滲吸采收率的影響,分析了自發(fā)滲吸機(jī)理。結(jié)果表明,陰離子表面活性劑改變巖心潤(rùn)濕性的能力好于非離子表面活性劑,兩種陰離子表面活性劑(ZPS、SDBS)將巖心表面由油濕反轉(zhuǎn)為水濕,非離子表面活性劑(SB)降低了巖心表面接觸角,但未達(dá)到潤(rùn)濕反轉(zhuǎn)的效果;油濕巖心介質(zhì)在注入水溶液中不發(fā)生滲吸,表面活性劑引起的接觸角改變可實(shí)現(xiàn)油濕巖心滲吸采油;巖心原始潤(rùn)濕性影響滲吸采收率,滲吸采收率增幅從大到小依次為水濕巖心中性巖心油濕巖心;三種表面活性劑均可使界面張力降至最佳滲吸界面張力范圍10-1~10-2m N/m,油水界面張力的降低有利于提高巖心自發(fā)滲吸采收率。
[Abstract]:In order to determine the effect of surfactant on permeability and oil recovery in dense reservoir by changing the wettability of rock and reducing the interfacial tension, the favorable conditions of surfactant imbibition and oil recovery are obtained. By measuring the contact angle of the core and the interfacial tension between the surfactant solution and the oil, The effects of three kinds of surfactants, heavy alkylbenzene petroleum sulfonate, 12 alkylbenzene sulfonate SDBs and sulfonbetaine SBs, on the permeability recovery of dense core were studied. The mechanism of spontaneous permeation was analyzed. The ability of anionic surfactants to change the wettability of cores is better than that of Nonionic surfactants. Two anionic surfactants (ZPS SDBS) reverse the core surface from oil to water, and Nonionic surfactants (SBs) reduce the contact angle of core surface. However, the effect of wetting inversion is not achieved; the oil wet core medium does not permeate and absorb in the injected aqueous solution, the change of contact angle caused by surfactant can realize the oil absorption and oil recovery from the oil wet core, and the original wettability of the core affects the permeability recovery, The increase of permeability and oil recovery factor is from large to small in order of water wet core neutral core oil wet core; The three surfactants can reduce the interfacial tension to the optimum range of 10 ~ (-1) ~ (-2) N ~ (-1) N ~ (-1) N ~ (-1) N / m, and the decrease of oil-water interfacial tension is helpful to improve the spontaneous permeability recovery of core.
【作者單位】: 提高油氣采收率教育部重點(diǎn)實(shí)驗(yàn)室(東北石油大學(xué));中國(guó)石油勘探開發(fā)研究院廊坊分院;
【基金】:“十三五”國(guó)家科技重大專項(xiàng)“儲(chǔ)層改造新工藝;新技術(shù)”(項(xiàng)目編號(hào)2016ZX05023005) 中國(guó)石油股份有限公司課題“體積改造設(shè)計(jì)、實(shí)施及評(píng)估技術(shù)研究與應(yīng)用”
【分類號(hào)】:TE357
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