The Feasible Study Of Improving Production And Injection By Water Flooding In Extra-high Water Cut Period

The hydro- fracturing is the main measure which was used wildly for the oil layer reconstructing, improving the daily production and slow down the decline rate of production. Sanan oilfield has been into the extra-high water cut stage since 2005. the tapping becoming difficult by fracturing, the water cut is higher and higher of pro-fracturing, the well and zone's condition for fracture being badly and the ratio of repeat fracture increase yearly. The case damage ratio of the potential well increased. The rules of well and zone choose has can't meet the demand of tapping in the extra-high water cut period. The article discussed the effect items and the technical development status of fracture detailed. Base on the deep understand of oil zone and construe by analyses the effect of number of fracture wells and the static and dynamic data. We has Understood the characteristics and laws of the remaining oil distribution in extra-high water cut period. The scope of choose the well and zone for fracturing being wildly and make the rules of choose the well and zone for fracture be true. The article give the optimize methods, zone group and construct parameters of fracture. All of this supplies the guaranties for IOR and EOR in Sannan oilfield.The acidification of injector is the effective methods for improving the absorption and the employ status of thin and poor oil zone. There are many methods of acidification methods, the effect is different because the feasible of oil zone. The item analyzed different reason of the absorptions of injector and discussed the mechanism of improving water injection technical by associated gas, surfactants, low-carbon active water. Statistic and analysis the pilot effect of number of improving injection methods since 2008. On the basic, sum up and evaluate the feasible of different methods in oil zone. We make the rule of well and zone choice and supply powerful instruct for improving the injection and optimization.