The Study On Mechanism And Parameter Optimization Of Artificial Strong Edge-water Flooding

Mi 242 block of Wangji Oilfield is located in Wangji town,Henan province,in the northern slope structural belt of Miyang Depression.Block gained industrial oil wells in 1994,January 1997 into production.Block oil-bearing area is small,with the weak edge water energy,and uses five point water injection development.Through the geological exploration and field datas,recognized the geological characteristics of the reservoir,this paper got the reservoir exhibited strong heterogeneity in the longitudinal direction,and the internal contiguous property was good,and the geological reserves were 23.04×10~4t by the geological model.According to the production data,there are some problems in Mi 242 Block.Injection-production well pattern is imperfect,fault and reservoir edge well pattern control degree is low;reservoir heterogeneity affects water flooding development effect,resulting in uneven distribution of remaining oil;the reservior has entered the stage of high water cut.The reservoir still has certain potential to be tapped,so this paper tries to use artificial strong edge water flooding technology to adjustment.Recently years artificial strong edge-water flooding is a new method proposed to solve the high water cut and extra-high water cut in the block.The method uses large well spacing and large displacement to inject water outside the oil-water boundary to make the waterline advance parallel to the oil-water boundary,which can greatly improve the recovery rate.Further study on percolation mechanism,made clear the difference with the edge water injection,natural strong edge water reservoir.The basic model was established through numerical simulation to screen the applicable scope of physical parameters,so as to obtain the reservoir conditions suitable for the use of artificial strong edge water flooding.The reservoir factors,development factors and surface engineering conditions in Mi 242 Block were comprehensively evaluated to be suitable for the use of artificial strong edge water flooding.The establishment of theoretical plate corresponding to reservoir object conditions and development parameters when using this technology has certain reference significance for the follow-up study and field implementation.Finally,this paper works out the adjustment plan for block development,supplies a plan of marginal water injection,after comparison the development effect of artificial strong edge water flooding is better,and selects the best scheme for this reservior.