Well Performance Evalution And Productivity Characteristic Analysis In Tight Reservoir

Based on the investigation of the production data of tight oil production in Xinjiang,this paper analyzes the dynamic characteristics of single well production in tight reservoir based on the dynamic data of Xinjiang tight reservoir.This paper analyzes the influence of geological factors,fracturing parameters and production parameters on the productivity of tight reservoirs.Through the gray correlation model,the total amount of fracturing and the amount of liquid produced are the main factors affecting the production capacity.Due to different fracturing methods,production capacity curve is very different.In this paper,according to the initial capacity and decreasing rate,the curves are classified into Class I,Class II and Class III.Combined with the decline in capacity evaluation methods,different fracturing methods of capacity decline curve was established.The results show that The Duong model and the SEDM model can meet the preliminarily rapid descent stage in the Class I model.The Arps model can describe this stage better in the Class II and Class III model.On the basis of the regional model of fractured expansion,a model of dense reservoir after horizontal fracturing is established.This model studies the seepage law of fractured fractures in horizontal wells in dense reservoirs,and analyzes the productivity characteristics of compact reservoirs under different fracturing parameters.The results of the model can reasonably explain the actual production capacity changes.The results show that the initial production capacity and the decreasing rate are related to the shape of the fracturing area,and the way of strengthening the fracturing near the well will have a large production capacity and the capacity decline rate is faster.