Experimental Study Of Aerating Surfactant Flood

Of the studies on EOR,foam attracts more and more attentions due to its unique charact -eristics,however,the foaming ability and stability of foam system always are afected by such factors as formation temperature, salinity of water and existence of crude oil.This paper utilizes Waring Blender method to evaluate the performance of foaming agent such assalt-resisting,oil-resisting and temperature-resisting,then screens out one excellent foaming agents TAS.This paper screens out foam stabilizer for polymer CMC applicable for water-control and flooding oil in oil-fields and also determines polymer foam system 0.2%TAS+0.15%CMC by evaluating effect and behaviors of polymer foam stabilizer such as salt-resisting, oil-resisting and temperature-resisting; meanwhile this paper studies the non-viscosifying foam stabilizers were evaluated.The performance of these stabilizers were not satisfying. The performance of combination system of those stabilizers and OP surfactant was worse than that of pure foamer.The main work of core test was to study factors that effect flow of nitrogen foam in porous media.The results show that flow drag was great when foam quality was 50～75% and gas quid ratio was 1:1～3:1. Drag coefficient had a good linear with permeability when gas quid ratio was 1:1 and displacing velocity was 0.6ml/min.The foam has a good permeability -selectivity as velocity decrease with permeability's growth. The stability of Nitrogen foam, in porous media was tested on three cores with permeability ranging between 1.1066μm~2～1.1356μm~2. Drag coefficient of the foam with gas quid ratio of 2:1 in the three cores is 206.31,213.48 and 220.58, respectively, at 90℃. Plugging rate of the first waterflooding after 50, 70 and 90 days was 98.41%, 96.81% and 91.57%, respectively, which shows that the foams is stable.The foam system has been studied enrich the theory of foam flooding and has important practical application value and social benefit...