The Test Study On Multiple Slugs System Flooding In Lamadian Oilfield

The scene practice indicated that polymer has well flooding effect, but it also exposed that it cannot plug the high - permeability formations well during driving oil in Inhomogeneous Thick Oil Reservoirs. Appearing the polymer to advance along the high - permeability formations in the note the varying degree in the process of injecting polymer, which has affects on the further improvement of flooding effect.At present each kind of profile control agent are all with difficulty to realize a longer term of validity, After the polymer forgiving slug of profile control , it will continue advancing along the high - permeability formations. In view of this kind of situation, in Labeixi block we carried experimental study on driving oil by multiple slugs. Multiple slugs system not only can driving oil but also can result of profile control. First injecting zwitterion polymer to produce precipitate to plug big pore, then uses the low density cross-linked polymer system to displacement. At last uses the anion polymer to displacement. This displacement way largely enhanced the radius of plugging and the intensity, of the high - permeability formations. And without increasing the cost, it effectively improve flooding effect. This is the first time to for Daqing carry experimental study on driving oil by multiple slugs. At present the quite tangible effect can be seen in this field test.Through the analysis and research to this experimental effect, multiple slugs system indeed can plug big pore, expand the of Lamadian Oilfield.The method of multiple slugs system not only explored a new way of improving oil volume of involving and enhance oil recovery further, in major reservoirrecovery but also opened a new mentality to reduce the cost of Polymer Flooding.