Study On The Optimization Method Of Fracturing Scale For Different Sand Bodies In Chaoyang Gou Oilfield

With the development of Chaoyanggou Oilfield,the effect of fracturing is decreasing gradually,and the development effect tends to be worse.The reason is that the research on the fracturing mechanism of the formation in the area is not enough,and the selection of fracturing parameters is not reasonable in the process of fracturing design and construction,which leads to the failure of ensuring the fracturing effect.The research level of fracturing technology directly affects the efficiency of oil and gas production.In order to improve the development effect,increase the contribution rate of fracturing,reasonably determine the fracturing scale,establish the fracturing culture and protection mechanism,based on the actual situation of the oilfield,using petrel and eclipse software,establish the geological models of three different types of blocks in Chaoyang Valley,and complete the water drive history fitting,with the fitting error controlled within 3%.On the basis of numerical simulation history fitting,the distribution of water saturation in various blocks is clarified.The numerical simulation method is used to simulate the development index change after fracturing and determine the optimal fracturing reconstruction scale.According to the numerical simulation results,it is determined that the pre pressure cultivation level of different sand bodies in three types of blocks increases by 0.7-0.8mpa,0.5-0.6mpa and 0.3-0.5mpa respectively on the basis of the original formation pressure,and the cultivation time is 6 months,6-7 months and 7months respectively.Collect and sort out the production data of existing fracturing wells,reasonably classify the post fracturing development effect of oil wells,and study and determine the post fracturing protection methods.For the well with good fracturing effect,the injection intensity should be increased by 1.05-1.1 times to supply formation energy to extend the effective period of fracturing;for the well with high water cut and low liquid production after fracturing,the paper divides three water cut rise levels and two liquid production levels,and puts forward combined measures such as water well logging,water well profile control and oil well water plugging to control water cut.Through the analysis and research in this paper,it can improve the deep understanding of the geological characteristics of Chaoyang Gou oilfield,achieve the goal of optimizing the fracturing scale of different sand bodies,establish thefracturing culture and protection mechanism,which has important guiding significance for improving the production degree of the remaining reserves of the reservoir and the fracturing construction effect.