Research On Automatic Allocation Strategy Of Water Injection Well Based On Multi-objective Optimization

Water injection method is a very effective oil field development method.However,with the stride of the mining routing,the water proportion of the reservoir increases and the production decreases year by year.Aiming at the over problems,taking the water syringe well spacing distribution as the research object,the MOEA is used to optimize the distribution and syringe method,which has great significance to improve the production of the oilfield in the afterward phase of reproduction and reduce the water proportion of the oil.Therefore,this thesis takes solitary well injection as the research object,and the main research contents are as follows.Firstly,the water injection process is analyzed,and compared with the existing distributed water injection methods,water injection intervals are divided by k-meanse++ algorithm,and a mass balance distribution model based on conductivity coefficient is established,and the vertical division factor divides the injection volume into sections of the well.Through model analysis,we take the total oil production as the optimization goal,and use EA to improve the layer composition and injection to improve the performance indicators in the afterward phase of oilfield exploit.Secondly,by means of the analysis and research on the assess target of water injection effect of water infusion wells,it is found that the optimization of one target often leads to the reduction of other target.Therefore,a multi-objective optimization problem of water injection well configuration and water injection is proposed.Research evolutionary algorithms,improve optimization algorithms by adaptive learning,a DE-MODEA is proposed and improve algorithm convergence,solution distribution and breadth.Finally,a sleeve of hierarchical water injection automatic allocation water syringe system is designed,the strategy is based on the result of layer division by k-means++ and optimized dispensing volume.Finally,by applying the distribution system and strategy to well testing,and the final result reduces the strategy can control the increase in reservoir water loss while increasing oil production later in field production.