摘要
选择某商品阴离子起泡剂用于胜利孤岛油田渤21块稠油油藏的热(85℃)氮气泡沫驱。在25℃测定了泡沫体积和半衰期及长填砂管模型中的阻力因子,确定气液比应在0.5~1.0范围,最佳值为0.5,起泡剂溶液浓度应在0.3%~0.5%,最佳值为0.3%。在渗透率1.91μm2、用目的油藏油井原油(20℃、85℃密度分别为0.9793和0.9377 g/cm3)饱和的长管模型上,氮气泡沫驱采收率为41.6%,比热水驱采收率高21.3%;在注入初期压差下降之后,注泡沫压差持续上升。在饱和同一原油、渗透率分别为5.59和1.02μm2的并联双长管模型上,氮气泡沫驱的采收率分别为69.8%和58.3%,平均值63.8%,而在5.60和1.11μm2的饱和原油并联双长管模型上,热水驱的采收率分别为43.3%和13.8%,平均值32.6%;压差曲线表明氮气泡沫改善波及体积的效果更好。图8表4参6。
A commercial anionic foamer is chosen for use in hot （85℃） N2 foam flood in heavy crude oil blacked reservoir B21 of Gudao, Shengli. Through measuring volume and lifetime of the foam formed and resistance factor in long tubular sand packs at 25℃, it is ascertained that the gas to solution ratio should be in range 0.5-1.0 and the optimal value --0.5; the concentration of the foaming solution--in range 0.3--0.5% and its optimal value --0.3%. On homogeneous tubular sand packs of permeability 1.91 μm^2, saturated with the crude oil from the aimed reservoir （density 0.9793 gcm^3 at 20℃ and 0.9377 g/cm^3 at 85℃ ）, the oil recovery by hot foam flood is of 41.6%, a value by 21.3% higher than that by hot water flood; the foam injection presure continuously raises after an initial period of pressure lowering down. On two tubular sand packs of 5.59 and 1.02 μm^2 in parallel, salurated with the same crude oil, the oil recovery by hot foam flood is of 69.8% and 58.3%, respectively, and 63.8% in average whileon crude oil saturated sand packs of 5.60 and 1.11 μm^2 in parallel, the oil recovery by hot water flood is of 43.3% and 13.8%, respectivdy, and 32.6% in average; the injection pressure curves show higher sweeping efficiency of hot foam in parallel sand packs.
出处
《油田化学》
CAS
CSCD
北大核心
2005年第2期188-191,共4页
Oilfield Chemistry
关键词
起泡剂
阴离子表面活性剂
氮气泡沫
泡沫组成
泡沫驱油
驱油效率
砂岩稠油油藏
胜利孤岛渤21块
foaming agent
anionic surfactant
nitrogen foam
foam composition
foam flood
oil displac^nent effwiency
heavy oil sandstone reservoir
block B21 in Gudao of Shengli
