Study On Oil Displacement Efficiency Of Salt Resistant Polymer In Pu Bei Pilot Area

PuBei pilot area locate in the north of Putaohua reservoir, which is low/medium permeability and high salinity of reservoir, has entered the high water cut stage now. According to the geological condition of PuBei, reservoir physical characteristics and the current production status, the salt polymer with low molecular weight but high solution viscosity has been used to maximize the development of the test area remaining oil. In this paper, so we propose a study on the effect of salt-resistant polymer flooding on this pilot area. And the results can provide theoretical basis for needs of actual production, also support for technical study.By indoor experiment of salt resistant polymer solution performance evaluation, it research the influencing factors of salt resistant polymer solution viscosity including the concentration of the polymer solution, standing time, shear stress, the temperatures and waters quality. And the result shows that, the salt resistant polymer solution has a good performance on the experiment of temperature, salt and shearing resistance. As the 3D geological model of the PuBei pilot area has been established with PETREL, and the water flooding history has been matched by ECLIPSE, we have confirmed the distribution of remaining oil and the development of major reservoir. Considering the reservoir characteristic of Pubei pilot area, by using the artificial heterogeneous core and ECLIPSE software, we study the flooding efficiency of salt-resistant polymer effected by injection parameter such as injection salt-resistant polymer concentration, injection rate, and injection volume, then put forward the optimum injection parameter and injected slug size. Experiment results show that the salt-resistant polymer solution can increase EOR more than 10% after water flooding. In order to develop the remaining oil of low/medium permeability in the pilot area, we optimize the development way of subsequent water flooding. It is best effect that fill all un-perforation of target bed uses subsequent water flooding to moisture content of 98% after polymer flooding. It can make a reasonable production for 18.8 years of pilot area, and ultimate recovery reach 51.13%.