Research On The Optimization Of Technology Policies Based On Injection Efficiency In Ultra Low Permeability Reservoirs

Quantitative evaluation and optimization of water injection efficiency have become an important way to improve the recovery of ultra-low permeability reservoirs.Streamline simulation can provide relatively accurate injection and production relationships and injected water allocation information.It is an important tool for evaluating water injection efficiency.In this paper,a DPDP streamline model considering the non-Darcy flow,capillary pressure and gravity is established.The water injection efficiency and swept capacity can be quantitatively evaluated by streamline simulation.Then the influence of fracture length and permeability anisotropy on the distribution of streamlines,water injection efficiency and swept capacity are analyzed.To improve the optimization effect,the water injection efficiency optimization method based on linear programming was improved.The comparison results show that the effect of improved linear programming method is better than other method.The optimization method is used in the Y284 block pilot test area in Changqing.The application result shows that the water flooding effect has been improved and the daily production of oil in this block has been significantly improved.