In order to solve the problem of polymer breaking through formation prematurely and forming inefficient or invalid circulation between oil and water wells during polymer injection period of block A,and improve the overall development effect of the block,the profile control mechanism of compound ion profile control agent was studied,and the profile control radius,profile control slug,injection mode and timing of profile control agent were optimized.The results show that the profile control radius is 45~56 m,and better profile control and displacement effects can be obtained by alternating injection of profile control slug and polymer flooding slug,stratified profile control and early profile control.The research results were applied to 7 experimental wells.After profile control measures,48 oil wells in Block A have achieved good oil increasing and water decreasing effect,the average oil increase of single well is 2.9 t,cumulative oil increase is 6 640 t,and the input-output ratio is 1:3.71.
Technology Supervision In Petroleum Industry
deep profile control
compound ion profile controlling agent
layered profile control