Experimental Study On Water Displacement Efficiency Of Sandstone Reservoir In Saltu Middle Area During Hjgh Water Cut Period

After years of waterflooding development,the sandstone reservoir in saltu area has entered the high water-cut period,and some reservoirs even reached the super high-water-cut period.Facing the current development form,It is very necessary to carry out the experimental study on the oil-water two phase seepage and the water displacement efficiency,analyze the characteristics of the oil-water two phase seepage,study the measures to improve the water displacement efficiency of the reservoir in the middle area of Saertu in the very high water cut period.In this way,through that experimental study of the experimental study in the non-steady state method,the experimental research on the two phase permeation flow of oil-water in the special high wate phase is carried out,and on the base of the data treatment method of the relative permeability of the oil and wat in the comparative analysis,a data processing method suitable for the relative permeability of the oil-water phase of the special high water phase is proposed,and the characteristic of the seepage flow of the oil-water two-phase in the special high water phase is proposed,and the influence rule of the water injection multiple on the water flooding efficiency is analyzed.Based on the characteristics of two-phase oil and water seepage in the period of ultra-high water cut in central sasac,the experimental study on the reservoir in the period of ultra-high water cut was carried out.The effects of increasing water drive speed,periodic water injection,timing of acceleration,changing injection direction and stratified intermittent shut-in mode on water drive efficiency of heterogeneous reservoirs in extra-high water cut are analyzed.Based on the above experimental results,this paper analyzes and proposes the optimal production increase measures in the middle saltu sandstone reservoir during the period of high water content.