Research On The Effect Of Exploiting Remaining Oil Of Side Interlayer After Polymer Flooding Using Horizontal Well With Chemical Flooding

Physical simulation and numerical simulation are both used in this paper to compare different chemical flooding project with horizontal well to exploit remaining oil of side interlayer after polymer flooding. It is found that recovery factor of foam flooding is better than polymer surfactant alternating flooding, than changing concentration polymer flooding, than high concentration polymer flooding. The horizontal well-foam flooding is the best project in exploiting remaining oil of side interlayer after polymer flooding using horizontal well with chemical flooding.Then CMG software is used to research the effect of angles of the main streamline to the extending direction of lateral accretion layer, the interlayer permeability and the deviation position of the horizontal well in two injection-two production mode on recovery factor. Concrete research content is that:(1) The influence of the angles of the main streamline to the extending direction of lateral accretion layer on recovery factor.(2) The influence of interlayer permeability on recovery factor.(3) The influence of deviation position of the horizontal well in two injection-two production mode on recovery factor. And it turned out that:(1) As the angle of the mainstream line to the extending direction of lateral accretion layer decreases, horizontal well-high concentration polymer flooding recovery factor increases and the overall recovery factor increases. The horizontal well-high concentration polymer flooding recovery factor increases by 8.97% and the overall factor increases by 5.96% from the angle of 45 o to 0o. So arranging injection- production well parallel to the extending direction of lateral accretion layer can improve oil recovery factor in allusion to lateral accretion layer chemical flooding on horizontal well.(2) With the reduction of the interlayer permeability, the recovery factor of the horizontal well-high concentration polymer flooding increases and the overall recovery factor increases. The factor can reach 14% when the interlayer is completely closed, while the factor is 4.9%~4.5% when the permeability ratio between interlayer with lateral accretion layer is 0.2~0.3.(3) The recovery factors of every stages of two injection-two production mode are higher than one injection-one production mode. As the horizontal well deviates to one side, the overall recovery factor is reduced. The factor decreases by 4.66% from the center position to the maximum deviation position...