Research Of The ASP Flooding Well Inflow Performance Based On Fractal Theory

In this paper, the mathematical model of the viscoelastic ASP flooding formation fluid flow through the fractal reservoir was established using the fractal geometry theory, and the numerical solution of the mathematical model mentioned above was presented using the finite difference method. In addition, the predictive deliverability of the viscoelastic ASP flooding lifting system inflow performance in fractal reservoir under the condition of given bottom hole pressure using the Lagrange interpolation method was presented. Using the model and method mentioned above, taken the X1-3-SP35 well in the No.4 Oil Recovery Factory of Daqing Oilfield as an example, the factors, such as formation permeability at the well bottom, effective thickness of the reservoir, fractal dimension, fractal index and so on, that affect deliverability of the viscoelastic ASP flooding lifting system inflow performance in fractal reservoir were analyzed. Moreover, taken 5 wells, such as the X1-3-SP35 well etc., in the No.4 Oil Recovery Factory of Daqing Oilfield as examples, the calculated output using the mathematical model of the viscoelastic ASP flooding formation fluid flow through the formation in fractal reservoir and the measured output in site were compared. The results showed that, the wells whose relative errors were less than 10 percent accounted for 100 percent of the proof wells, and this indicated that the mathematical model established and the numerical calculation method adopted in this paper were correct.Based on this, combined with the method of node system analysis and set the node of pumping well bottom, the method of determining reasonable bottom hole pressure and reasonable output of the ASP flooding lifting system, that's to say, the method of determining productive coordinated point was presented. Taken the X2-31-SP46 well in the No.4 Oil Recovery Factory of Daqing Oilfield as an example, the factors, such as formation permeability at the well bottom, effective thickness of the reservoir, fractal dimension, fractal index and so on, that affect reasonable bottom hole pressure and reasonable output corresponding to the ASP flooding lifting system productive coordinated point were analyzed.Applying the results studied above, the software"the determination of the ASP flooding lifting system productive coordinated point"was programmed. Besides, the real calculation of 5 pumping wells in the ASP flooding testing area in the No.4 Oil Recovery Factory of Daqing Oilfield was conducted. The reasonable bottom hole pressure and reasonable output corresponding to the productive coordinated point of each well were obtained.