Optimization Of Well Pattern And Injection-production Based On Flow Field Adjustment In High Water-cut Reservoirs

After the oil field has entered the high water cut stage,there is still a lot of remaining oil in the oil field.The remaining oil is controlled by the reservoir flow field.From the angle of reservoir flow field,the evaluation system of well pattern and injection-production adaptability for high water cut reservoir can provide theoretical guidance for well pattern and injection-production optimization.Firstly,the oil phase and the water phase were taken as the research object.According to the remaining oil distribution and flow characteristics in the high water cut stage,the abundance,the phase flow coefficient and the streamline density were used as the main evaluation indexes.By setting the membership function,the combination of single index and the evaluation criteria of the index,the evaluation system of well pattern and injection-production adaptability for high water cut reservoir was established,and the evaluation indexes were solved by programming.Then,the evaluation system was used to evaluate the adaptability of typical well pattern in high water cut reservoir.The effect of five well pattern transformation methods and three well pattern encryption methods for inverted nine spot well pattern was analyzed,and the adjustment mode of well pattern was determined.Finally,applying the foregoing theory to the actual reservoir,the adjustment scheme of water injection and well pattern local encryption was optimized.The reliability of the optimization scheme was verified by numerical simulation of reservoir.It is concluded that the evaluation system can take into account the characteristics of the reservoir,the distribution and flow characteristics of the remaining oil.It is closer to the actual situation of the high water cut reservoir.The evaluation system enriches the optimization method of well pattern and injection-production in high water reservoir,which is of great significance to the exploitation of the remaining oil in high water cut.