Study On Chemical Flooding Reservoir Adaptability For Laojunmiao Layer

Chemical compound flooding is a new technique developed on the basis of conventional and single drive system, which can be applied in high water cut period of Oilfield.Value-added program is developed through a well understand of the specific reservoir physical properties, fluid properties, reservoir pressure and other factors obtained via a deep-going investigation on this oil field.Through the theoretical research on the influencing factors of the compound flooding, the composition, physical properties, impact factors of stability, rheological behavior, seepage characteristics and displacement mechanism of the foam system are explained firstly; that system gas liquid as the continuous phase and gas as the dispersed phase, foam with shear thinning rheological properties, "in case of oil to eliminate bubbles, water stable" blocking the water does not block the characteristics of oil. Then, the seepage characteristics of the three element system, displacement as well as the influence factors of oil displacement: polymer,alkali, surfactant are discussed, respectively. Furthermore, the effect of slug combination is analyzed. Optimization of the oil displacement agent type, concentration, slug size expansion experimental study on agent parameter for ternary system is performed via indoor physical simulation experiment, obtaining the polymer CP=1200mg/L+ betaine 0.3%+ alkali 0.8%,injection volume and 0.7PV for optimal injection system.Moreover, investigations on the foam system gas / liquid ratio, the concentration of foaming agent and stabilizing agent, the injection quantity and the permeability were carried out, getting the maximum increase of oil recovery of 27.3% when the gas liquid ratio was 3:1;the higher the concentration of foaming agent was, the higher the foam displacement recovery rate would be, resulting in a higher permeability and a higher recovery rate. Finally, through research on the slug combination, in the "bubble + ternary combination system, foam system was more favourable than ternary system to improve the recovery rate of contribution, and recovery rate increased with the foam system and the ternary system of alternating injection times. Poly table of the bubble 0.1PV+ complex 0.1PV+ bubble 0.1PV+ complex 0.1PV+bubble 0.1PV+ complex 0.1PV+ bubble 0.1PV+ polymer surfactant 0.05 PV is the optimum injection project agent 0.05 PV. The experimental results for Laojunmiao oil field development has certain directive significance through chemical compound flooding of theoretical research and laboratory simulation.