| Aiming at the Shengli Oilfield which had the characters of deeper burial depth and stronger reservoir heterogeneity,multiple thermal fluid flooding was applied,besides,a good performance was achieved in recnet years.This paper evaluated the viscosity reducer agent,gas and foam for dynamic heat transfer process,displacement pressure and oil displacement effects,which is of significance to field application,through one-dimensional and two-dimensional physical models.This paper evaluated the performance of the additive in multiple thermal fluid.The viscosity-reducing rate on heavy oil was up to 93% when the concentration of oil displacement agent was higher than 0.03% at 65?.The alkylbenzene sulfonate foam has better plugging performance in the sand pack of 300 ~ 5000×10-3?m2.For a higher permeability(greater than 5000×10-3?m2),the plugging performance becomes poor.With the increasing of oil saturation,the drag coefficient of the foam reduces.When the oil saturation is more than 55%,the drag coefficient is less than 20.This paper also evaluated the influence on temperature,gas-liquid ratio and concentration of foaming agent for foam drag coefficient.Oil displacement effect on the viscosity reducer assisted hot water flooding,gas assisted hot water flooding and foam assisted hot water flooding were evaluated by one-dimensional physical model.The results showed that,recovery efficiency of 0.3% alkylbenzene sulfonate foam and 0.06% viscosity agent assisted hot water flooding could reach 85.6% in gas-liquid ratio 1:1 at 100?.Besides,spread regularity of multiple thermal fluid assisted steam flooding was studied by two-dimensional physical models.To the homogeneous and oil-saturated plate model,both nitrogen assisted steam flooding and foam assisted steam flooding could improve the sweap efficiency and “steam channeling” was controlled.As a result,sweep volume was increased and steam flooding effect was improved.In the above flooding methods,foam assisted steam had better effect. |
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