Tudy On Waterflooding Of Yan 9 Reservoir In Xinzhuang Bay

According to the phenomenon of rapid increase of high water-cut wells and low-yield and low-efficiency wells after water injection in Yanzhuangwan No.9 reservoir,based on the understanding of the geological characteristics of the reservoirs,this paper analyse the effectiveness of waterflood and the evaluation of waterflood development are evaluated,and a comprehensive treatment plan was derived based on the reservoir project which was demonstrated before.The main research contents are divided into the following aspects:(1)Research on Yanzhuangwan Yan 9 reservoir from the aspects of geological survey,reservoir characteristics,reservoir characteristics,etc.The results show that:Xinzhuangwan block belongs to structural-lithological oil Tibetan;Sensitivity is partial to weak water,moderate to weak,sensitive,weak,sensitive to water,moderate to weak,salt-sensitive,acid-absent,weak acid,alkali-sensitive,reservoir;The original wettability was between weak hydrophilic and weakly lipophilic;the extension 91 and 92 showed strong heterogeneity and the extension 93 had weak heterogeneity.(2)Analyze the high-water wells and low-yield and low-efficiency wells in the reservoir and find that the reason for the low yield and low efficiency wells is that poor reservoir properties,incompatible injection and production,and seeing water and the reservoir itself are high.Aqueous etc.;The cause of high water content is the high water content of the reservoir itself and the rapid rise in water content after the well sees water.(3)Evaluation of the effects of water injection development at the present stage of Yanzhuangwan Yan 9 reservoir.It is believed that the current water content of the reservoir is rising rapidly,the water drive control is poor,the water injection efficiency is low,and the overall performance is poor.(4)Apply the method of reservoir engineering to demonstrate the well spacing,pressure system,oil production rate,injection and production ratio,etc.,and conclude that there are still low oil recovery rates,low injection and production ratios,and unbalanced injection and production.Well-water injection volume is low,the well pattern is not matched with the reservoir,and the injection well pattern is not perfect.In response to the above issues,based on the demonstration of the reservoir project,the strata system,well pattern,injection and production correspondence,water injection volume,and low-yield,low-efficiency,high-incision wells were adjusted to optimize the comprehensive treatment plan.It is predicted that the Yanzhuangwan Yan 9 reservoir will accumulate 41.17×10~4t of oil in the 15 years after comprehensive treatment,and the water content will be 95.9%.The recovery rate is 11.27%,and the average annual oil recovery rate is 1.03%.