Study On Multifunction Compound Profile Modification Technology For Inhomogeneous Reservoir

When oilfield water flooding exploitation go into the mid-and-late stage, water ratio rises sharply and the output diminishes rapidly in oil well and the remaining oil is difficult to be developed effectively. Traditional technologies only focus on improving the big pore channel of the near well area of reservoir, ignoring the function of displacement agent in the matrix. Because the influence of big pore channel for long time, the recovery of reservoir is very low.Therefore, this article chooses the ultrafine bibulous microspheres profile control agent and SW-b as compound system. Based on the adaptability of the compound system to this reservoir, I get the reasonable concentration and the best slug through the laboratory experiment, optimized parameter of the compound flooding control.Secondly, I study the feasibility and mechanism of improving recovery of non-homogeneous reservoir technique, the result shows improved recovery of non-homogeneous reservoir technique is feasible; profile control agent and chemical flooding agent has good mutual promotion; ultrafine bibulous microspheres change flow direction in deep reservoir, so the surfactant and injected water can penetrate into special low permeability and not well developed reservoir effectively, when chemical displacement agent play a role for improving oil recovery in these remaining oil certain areas.Finally, the technology of compound system has been applied in Changqing Oilfield, the result of which shows that this technology can greatly enhance injection pressure, change the profile-log of water injection to improve oil recovery factor on a large scale. Therefore, this technology has good application prospects in non-homogeneous reservoir.