This paper recommends the application of acidic fracturing technology for horizontal wells in Yubei region basing on its fractured reservoir’s characteristics, and the numerical simulation method is used to optimize the parameters of acidic fracturing. According to the results of optimization, the proper acid system is selected, and the construction parameters of acidic fracturing are optimized. According to the results of numerical simulation, we recommend the fracture half-length to be 120m, the fracture conductivity to be 30D.cm, and the fracture number to be 5. According to the properties of reservoir in Yubei region and the optimization results of fracture half-length and fracture conductivity, the alternative injection of crosslinked acid and ordinary gelled acid is recommend. The injection rate of crosslinked acid is 5m3/min, with volume 300m3. The injection rate of ordinary gelled acid is 6m3/min, with volume 300m3.

According to the feature of the second oil layer in the west block of Beierxi, this paper investigated the relationship between the permeability contrast and the recovery efficiency, and the relationship between the permeability contrast and the descent range of water cut of polymer flooding, using the numerical simulation. From the comparative analysis of the development effect with different methods of polymer-injection, it got the boundary of the interlayer permeability contrast of the positive and inverted rhythm layer in the second oil layer with the separated zone and separated quality polymer-injection respectively. That provided certain theoretical foundation for carrying on the polymer flooding in the region of interest.