How to improve oil recovery in Wuliwan X1 reservoir
Wuliwan reservoir in Jing'an oilfield is mainly developed by X1 reservoir of Tri-assic system,which is a low permeability reservoir with lake delta deposits and strong het-erogeneity in plane and profile,mainly by water injection.At present,X1 reservoir is in double-high development stage with comprehensive water cut of 72.5％and recovery degree of 25.4％.The horizontal one-way breakthrough of the reservoir,the contradiction between the upper layer and the interlayer in the profile are increasingly prominent,and the efficien-cy of water flooding is gradually declining,which affects the stable production and develop-ment effect of the oilfield.How to improve ultimate recovery is the eternal subject of reser-voir development.This paper mainly summarizes the measures to improve the final oil recov-ery of X1 reservoir,such as cavitation flooding,microsphere flooding,adjustment of injec-tion-production well pattern,unstable water injection and precise water shutoff,etc.,it pro-vides direction for enhancing oil recovery of the whole X1 reservoir in the later period.
double-high development stageenhanced oil recoverycavitation floodingmi-crosphere floodingadjustment of injection-production well pattern
万方数据
维普
