ZY Oil Displacement Agent Bay Wellblock Of Application Research On The Old Grass

With the application of the tertiary oil recovery technique, People are paying more and more attention to surfactant flooding technology. ZY oil displacement agent is proposed in this article as the main reagent, its performance is studied and used in the field test. ZY oil displacement agent is one kind of Gemini surfactant. It can effectively reduce oil-water interfacial tension and make the displacement efficiency greater because of its particular structure.Laboratory test shows that ZY oil displacement agent has good compatibility with the produced water from Chang2、Chang6 and Chang4+5 in Yanchang Oilfield. There is not going to produce precipitation. ZY oil displacement agent displacement test shows this agent can effectively increase oil recovery by 10～15% to the waterflooding in the different core permeability tests.The geologic condition of LaoCaoWan well-block is comparable to the experimental zones, according to the ZY oil displacement agent process design and field test, the ZY oil displacement agent can effectively reduce oil-water interfacial tension in Chang2、Chang6 and Chang4+5 oil reservoirs. It reduces waterflood pressure and increases oil recovery.LaoCaoWan well-block in ZiChang Oil Field is in the Chang2 reservoir of YanChang formation. Waterflood development starts relatively late here, the rate of production decline decreases quickly, the formation depletion is worse. In this article laboratory test is made as the base, we determine to use continuously inject water and choose ZY oil displacement agent 0.5%(m/V) by processing design and field test. This will effectively increase oil recovery. It is hopeful of giving a reference for the development of the ZiChang Oil Field in the later period through the field test.