In order to study the typical block of onshore oil fields, a twodimensional interlayer physical model is designed. The experiment scheme of hydrophobic associating polymer flooding after polymer flooding is monitored by self developed saturation monitoring system. The spread and use of typical onshore oil field blocks are grasped by carrying out the experiment about the displacement, the use and the monitor of the twodimensional interlayer physical model and monitoring and the oil saturation distribution in the chemical flooding stage in real time. The results indicated that: in twodimensional interlayer core parallel experiments, recovery efficiency of the land typical block could be improved by 13.69% through injecting 1.05 PV Huading I hydrophobic associating polymer after polymer flooding. Saturation monitoring data showed that chemical flooding stage after polymer flooding had formed oil wall inordinately, increased filtrational resistance, so as to enlarge the swept volume and improve recovery efficiency. The key to improve the oil recovery in polymer flooding was the efficient use of the low permeability layer. A wide low oil saturation line was formed in core mainstream channels with a strong oil displacement efficiency after Huading I hydrophobic associating polymer flooding.

There are many problems in the development process of the low permeability oilfields including water injection difficulty, high water flooded degree, low utilization efficiency of injected water and gas channeling of gas injection. Through a large number of laboratory physical simulation experiments and tests, the best CO2foam system was selected out for a low permeability blocks CO2foam flooding in Jilin oil field. The stability, foaminess, injectivity and applicable scope of the permeability of three systems were conducted. The results showed that the three kinds of foam agent all had good foaminess and stability, and all of them could be injected within the range. When the temperature rose from 45 ℃ to 100 ℃, the halflife of foam systems sharply reduced, and the stability of them turned bad. In the three foam systems, FP388 was the optimal one which had best foaminess and comprehensive performance.