Experimental study on the effect of Cr³⁺ on improving ASP

For the limitation of control ability in ASP system, it is necessary to improve fluid entry profile by pre-slug of polymer gel in oil field application. It is related to the compatibility between the polymer gel and ASP. By adding organic chromium to ASP, the effect on the properties of ASP added with Cr³⁺ was investigated including viscosity, interracial tension, resistance factor, and so on. The compatibility between the Cr³⁺ polymer gel and ASP and the effect on improving the properties of ASP added with Cr³⁺ was evaluated. The experimental results show that the Cr³⁺ has little influence on the viscosity and interracial tension of ASP, and there is a outstanding increase on resistance factor and residual resistance factor. The oil recovery is higher than using ordinary ASP to oil flooding. That not only shows the good compatibility between the Cr³⁺ polymer gel and ASP system, but also provides a new method to improve the effect of ASP system.