Study And Experiment On Waterflooding Effect Improvement By Profile Control And Displacement

Profile control and displacement is one of the main engineering technologies to improve the waterflooding recovery in secondary development.Study and Experiment on Waterflooding Effect Improvement by Profile Control and Displacement focused on the technical needs of improving waterflooding effect.Studies were carried out targeting on oil stabilization and water control effect of profile control and displacement and application in large scale.Fuyu oilfield belongs to sandstone reservoir with well developed fractures and strong heterogeneity.Laterally,sedimentary microfacies are mainly submerged distributary channel with strong difference in permeability.There is obvious direction in waterflooding process laterally.It's mainly positive rhythm vertically.There are dominant channels at the bottom.Vertical natural fractures with the direction of east-west are developed in the reservoir.And oil wells are fractured and put into production.Created fractures make dominant channels more complex.Moreover,well patterns are adjusted many times;the distances of well spacing and array are narrower;injection and production response is sensitive.Therefore,it's already in the period of high water cut development;ineffective water recycling is serious.There is still great potential in improving waterflooding recovery of mature oilfield.Profile control and displacement is one of the main engineering technologies to improve the waterflooding recovery in secondary development of mature oilfield and to stabilize oil production and control water.According to the complex problems in oilfield development,profile control and displacement technology used in low cost blocks has great applying prospect.