Daqing Oilfield Songfangtun Improve The Recovery Profile Control Technology Research

Modern reservoir description, numerical simulation has very important role in researching the lower permeability formation growth characteristics and remained oil distributing disciplinarian. Under the foundation of understanding sufficiently the remained oil distribution and disciplinarian in Zhu-san tested regions, the dynamic forecasted research was done by numerical simulation. The profile modification agent which use the crosslinking polyacrylamide was prepared. The depth profile modification operation was done in the Zhu-san tested regions. It can obtain better effect and economic benefit.Through the experiment research, the concentration of polyacrylamide is the main factor that affects the property of profile modification agent. In the neutron-environment which the concentration of KC1 is 5000mg/L and the crosslinking ratio is 20/1, the polyacrylamide concentration which formed crosslinking polymer is less than 600mg/L. The concentration of KC1, crosslinking ratio, the molecular weight of polyacrylamide have a certain effect to viscosity property of the system. The system has a certain amortizing role. In the amortizing ability range, the PH value has little effect to the system in the reaction early stage.According to the experimental characteristic, the HPAM content in the crosslinking system of static adsorption and flow experiment was measured by ultraviolet prismatic method. The Al content was measured by atom absorption prismatic method. The absorption of crosslinking agent is lower than HPAM's in this system. Because the HPAM formed gel particals, the shape, structure changes greet. The adsorption lay is thick. The adsorption capacity is bigger than that of the uncrosslinking HPAM.According to the calculated result of retention, the crosslinking degree of crosslinking agent is not high in the crossling polymer system in this experiment. The adsorption balance of cosslinking agent can be easy moved in the corn flowing. The gel velocity is bigger according to the presume of measurement of gel partical diameter.Because the adsorption of crosslinking agent can affect the gel-formed process, it cannot affect the flow in the corn. According to the picture of crosslinking polymer and above analysis,the corsslinking polymer in the solution is a colloid dispersion system of small particals. In the HPAM gel, the partials is independence and the connection is weak. The gel partical diameter of HPAM is 200-600nm. It also shows that microscope can be used to study the micro cosmic configuration of crosslinking polymer gel. The depth profile modification technique of corsslinking polymer can improve development effect of high water cut period in low permeability oilfield. It also has important meaning of improving the finally recovery. The result of numerical simulation shows that the recovery of the depth profile modification improve 2 percent than the polymer driving the oil. It improve 8 percent than the water driving the oil.