Lamadian Oilfield SⅢ4-10Layers Profile Control Technology Research Before Polymer

Lamadian Oilfield PI1-2reservoir polymer flooding at present basically ended, SⅢ4-10reservoir polymer flooding has become the key to increase oil production and long-term sustainable development in oilfield. In order to improve the overall development effect of polymer flooding in SIII4-10reservoir, give full play to role of enlarging sweep volume of polymer, deep profile control in injection wells which exist water channels before polymer flooding.Since the properties of SⅢ4-10reservoir are very different from the properties of PI1-2reservoir in Lamadian oilfieldand,, injection parameters design method which was the successful application to PI1-2reservoir polymer flooding profile control need further optimization and adjustment according to the SⅢ4-10reservoir conditions. This articles carry out the research for deep profile control technique in SⅢ4-10reservoir before polymer injection in block A of Lamadian oilfield, provide a theoretical basis and guidance of depth profile control experiment in SIII4-10layers of Daqing Oilfield.In the analysis of Lamadian Oilfield reservoir sedimentary characteristics and flooded condition foundation of block A, combining the block dynamic monitoring data, determine the well and layer selection principle of profile control wells of block A; particle with water swellable. is injected into the formation pore, in the near wellbore zone, due to the pressure difference is bigger, particles in water drive pressure, deformation, through the reservoir pore moves to deep reservoir, to oil displacement effect.In the deep layer, due to the pressure difference smaller particles in pores, retention, block pores, the profile control effect; organic chromium gel profile control agent to partially hydrolyzed polyacrylamide and cross-linking agent (organic chromium ion), and add the efficient stabilizer, indoor experiments show that, in the polymer solution concentration1500mg/L, crosslinking ratio30:1, stabilizer concentration800mg/L, profile control agent gel viscosity can reach above20000mPa.s.Through the indoor experiment study, combine the block profile control well, reservoir conditions, to sa Ⅲ4-10layer polymer injection depth profile injection parameter optimization design; A block profile control field test shows that, after the optimization of injection parameters for profile control and oil good matching performance, polymer flooding injection pressure rise rate, water absorption profile improved, well plugging high permeable layer, improve the block of the polymer flooding effect, and has a good application prospect.