Tune In Tune With The Drive And The Combination Of Flooding To Enhance Oil Recovery Experimental Study

For the present, the questions about profile modification oil displacement and combination technology are not yet quite clearly, such as compatibleness etc. There is lack of theory criterion on when to modify profile and which reservoirs are adapt to modify profile> displace oil or combination technology.In view of this, the paper aiming at Da-gang oil field' s geological conditions, studied the good weak gel with sewage compatibility .In addition , the paper basing on interface tension experiment, emulsification experiment and alkaline consumption experiment screening excellent displacement systems. Through a great deal of double parallel connection core flow experiment and tridimensional plate model experiment methods, carry out injection profile modification, oil displacement and combination technology study and work out following conclusion: (1)Profile modification is relatively fit for heterogeneous reservoir, while reservoir permeability gradation is less than 4, the improved oil recovery amplitude of profile modification is limited(<10%). Oil displacement is the most suitable technology for homogeneous reservoir, when reservoir permeability gradation is more than 8, oil displacement enhanced oil recovery effect is not good(<2%). (2)Combination technology have comprehensive reservoir flexibility, it may achieve favorable effect when experimental study permeability gradation ranges from 2. lto 15.2, the technology achieve effect. (3) It is the best time to profile modification when the oil contains water 30% around. At this point, proceed injection profile modification procedure reservoir recovery amplify max, ultimate recovery highest too. (4) Profile modification suited for both positive rhythm reservoir and anti-rhythm reservoir, whereas displacement and combination technology are fit for anti-rhythm reservoir.Through microcosmic module experiment, study the main mechanism of profile control oil displacement and combination technology . Then reacha conclusion: not only could profile modification increase sweep efficiency, but also is able to partly increase microscopic displacement efficiency. Oil displacement could depress oil water interfacial tension, improve wetting property of reservoir rock , and increase water-flood displacement efficiency; It was a more perfect improved recovery method that profile control and flooding combination technology could increase water-flood sweep efficiency as well as increase displacement efficiency.