Dynamic Analysis Of Water Injection Development Of Chang 2 Reservoir In Xuezhuang Block,Dingbian

With the growth of development years in Xuezhuang oil area,the well condition in the oil area has deteriorated year by year,the water cut has increased rapidly,and the water drive effect is not obvious.These factors seriously restrict the process of efficient development in the oil area.Therefore,more in-depth dynamic analysis and further excavation of development contradictions are the key technical means to stabilize oil and control water in the oil area.In the study,the geological characteristics of the reservoir are re recognized,and the main strata are subdivided into single sand bodies;The comprehensive dynamic analysis is carried out according to the sequence of single well,well group and reservoir,and the injection production relationship,benefit,water injection of water injection well,reservoir formation pressure and water injection index are analyzed;The contradiction of water injection development is deeply excavated,and the development adjustment suggestions are given.Through the comprehensive research of this paper,it is considered that Xuezhuang Chang2₁²can be subdivided into three single sand bodies according to sedimentary cycle and stage.The distributary channel area of（1）single sand body in the northeast and（2）single sand body in the central and southern part is the core production area,and the reservoir type is structural lithologic reservoir.The reservoir sand bodies in the core production area are thick,and they are all located in the high part of the structure.At the same time,the initial production is high and the bottom hole flow pressure is high,but the production decreases rapidly and the liquid production has a downward trend.The well pattern in the oil area is relatively perfect,the formation pressure level has increased slightly in recent two years,and the two decline rates have a downward trend,but the effect of water injection is still not obvious.By drawing the charts of water storage rate,water drive index and water consumption index,and fitting the relevant curves,the current water injection development level of the oil area is analyzed.The analysis shows that the oil reservoir is still driven by natural energy,and has changed to artificial water drive after the injection allocation and improvement in recent two years.However,at present,the formation is still seriously deficient,and an effective injection production displacement system has not been formed.By deriving and drawing four kinds of water drive curves of methyl ethyl propyl butyl,the first three kinds of water drive curves are used to calibrate the final recovery of Chang 2 reservoir under the current injection production system,which is 26.48%.Finally,it is suggested that the next stage adjustment of the oil area should improve the injection production well pattern at the edge and continuously supplement the formation energy to obtain higher recovery.