隨著移動油液滴聚成帶，一個小的油滴聚集在大的油滴上，匯聚成油。含表面活性劑驅油(you)(you)體系通過巖(yan)石(shi)(shi)孔隙時，巖(yan)石(shi)(shi)表面的(de)油(you)(you)滴(di)(di)(di)和油(you)(you)膜會(hui)(hui)以小油(you)(you)滴(di)(di)(di)形(xing)成(cheng)(cheng)，從(cong)巖(yan)石(shi)(shi)表面清(qing)洗下(xia)來(lai)，小的(de)油(you)(you)滴(di)(di)(di)與(yu)驅油(you)(you)系統(tong)過程將相互(hu)碰(peng)撞(zhuang)，形(xing)成(cheng)(cheng)大(da)的(de)油(you)(you)滴(di)(di)(di)，然后(hou)油(you)(you)滴(di)(di)(di)碰(peng)撞(zhuang)，形(xing)成(cheng)(cheng)較大(da)的(de)油(you)(you)珠(zhu)，大(da)油(you)(you)珠(zhu)碰(peng)撞(zhuang)成(cheng)(cheng)油(you)(you)帶，油(you)(you)帶會(hui)(hui)和小滴(di)(di)(di)油(you)(you)、油(you)(you)珠(zhu)結合形(xing)成(cheng)(cheng)較大(da)的(de)油(you)(you)區，油(you)(you)帶沿驅體液的(de)方(fang)向流動，使剩(sheng)余油(you)(you)流入生產井。

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有時原(yuan)油表(biao)(biao)面(mian)(mian)活性(xing)劑驅(qu)油體系(xi)對原(yuan)油的乳(ru)化能力主(zhu)要表(biao)(biao)現在(zai)油水兩相流，表(biao)(biao)面(mian)(mian)活性(xing)劑驅(qu)油體系(xi)可以快速排出，分(fen)散，剝離巖(yan)石(shi)表(biao)(biao)面(mian)(mian)，O/W乳(ru)狀(zhuang)液的形成，從而(er)改(gai)善(shan)油水流度比，提(ti)高波及效率，提(ti)高產量。

此(ci)外(wai)，由(you)于表(biao)(biao)面(mian)活(huo)性(xing)劑在油(you)滴表(biao)(biao)面(mian)上吸(xi)附電荷，增加油(you)滴和巖石(shi)顆粒的靜(jing)電斥(chi)力，油(you)滴不容易重新粘貼到巖石(shi)顆粒表(biao)(biao)面(mian)，導致(zhi)表(biao)(biao)面(mian)活(huo)性(xing)劑驅(qu)油(you)系(xi)統(tong)(tong)的液(ye)體夾帶(dai)，沿流動方向流向采(cai)油(you)井，提(ti)高(gao)噴油(you)系(xi)統(tong)(tong)的驅(qu)油(you)效(xiao)率(lv)和提(ti)高(gao)采(cai)收率(lv)。

用陰離(li)子表(biao)面(mian)(mian)(mian)活(huo)性劑(ji)(ji)(ji)或(huo)非離(li)子表(biao)面(mian)(mian)(mian)活(huo)性劑(ji)(ji)(ji)驅(qu)油(you)(you)時(shi)，表(biao)面(mian)(mian)(mian)活(huo)性劑(ji)(ji)(ji)會吸附在油(you)(you)滴(di)和顆(ke)粒的(de)表(biao)面(mian)(mian)(mian)，巖(yan)石或(huo)油(you)(you)滴(di)表(biao)面(mian)(mian)(mian)電(dian)荷密度增大，使(shi)油(you)(you)滴(di)和巖(yan)石表(biao)面(mian)(mian)(mian)的(de)靜電(dian)斥(chi)力增大，油(you)(you)滴(di)被驅(qu)油(you)(you)體系夾(jia)帶，達(da)到提高(gao)驅(qu)油(you)(you)效(xiao)率，提高(gao)原油(you)(you)采收率的(de)目的(de)。?

降低界(jie)(jie)面(mian)(mian)張力(li)是表面(mian)(mian)活(huo)性劑(ji)驅的(de)基(ji)本依(yi)據(ju)，是兩(liang)(liang)親(qin)分(fen)子，取代(dai)界(jie)(jie)面(mian)(mian)溶劑(ji)分(fen)子的(de)結果。界(jie)(jie)面(mian)(mian)上吸附的(de)兩(liang)(liang)親(qin)分(fen)子越(yue)(yue)多，兩(liang)(liang)親(qin)性分(fen)子和油相(xiang)分(fen)子和水(shui)分(fen)子的(de)分(fen)子量越(yue)(yue)接近等于，且有較(jiao)大的(de)絕 對值，則界(jie)(jie)面(mian)(mian)張力(li)越(yue)(yue)低。表面(mian)(mian)活(huo)性劑(ji)性質、油水(shui)相(xiang)性能(neng)(neng)、儲層環(huan)境（溫(wen)度(du)、含(han)鹽量）變化(hua)及驅油性能(neng)(neng)也會影響。