The Simulation Experiment Study Of Foaming Profile Control In Steam Injection Production Of Heavy Oil Reservoir

Steam drive development is one of the principal techniques in developments of the heavy oil. In the field experiments and industrial applications, steam and hot water flow in the high permeability layer for the effect of gravity override and steam Channeling, which result in steam injection volumetric sweep efficiency and ultimate recovery decreasing heavily, development cost increasing and water cut rising too fast. The foam profile method shows great economic prospect as a way of plugging channeling, controlling steam overlay and enhancing oil recovery.The foamability, stability, salt resistance and temperature resistance of six kinds of foam agents were evaluated based on the thermal recovery after water flooding and steam foam block experiment subject of FuYu oilfield. A high temperature resistance foaming agent FPJ which suitable for steam carbondioxide foam system was screened through the determination of resistance factor. The relationships between the viscosity, density, expansion coefficient and solubility with the variation of temperature and pressure were studied in the carbondioxide-heavy oil PVT experiment.Different permeability fields were established through the single-double tube experiments. The results indicate that recovery can be improved because more hot water will flow to low permeability core and the swept volume of low permeability core will increase. The results of different remaining oil saturation profile control experiment show that thermal fluid foam has good plugging capacity for secondary water body and plane high permeability channel, carbondioxide foam is suitable for adjustment of longitudinal heterogeneous reservoir water injection profile formed by the difference of permeability and plane non-uniform water channeling because of geometrical pattern flooding.Steam injection 3-d physical model system was set up according to the similarity theory. The seepage channels because of water flooding and steam injection in areal well pattern of heavy oil reservoir were simulated. Secondary water body and high water-phase permeability channel formed in reservoir which leads to high moisture content in later stage of water-flooding and field declining of oil well because of the big difference of water-oil mobility. The experiment adding carbondioxide foam in later stage of steam-injection indicates the recovery of steam foam-injection development after water-flooding and steam foam-injection development after steam-injection are better than steam-injection only. It is proved that the recovery of steam foam-injection can be improved by 10～25% than steam-injection only. The steam foam combination flooding can take part in the adjustment of 3-d steam entry profile.