Synthetic Study For Profile Control And Flooding Of Aqueous-media Dispersing Type Emulsion

Most oil field injected sea water into formation to supplement producing energy for production of offshore oilfield. Depending on the injected water,oil flow to well bore through porous media. Because the viscosity of water is more lower than that of oil, thus, the injected water fingering serious during displacement. Meanwhile the finger advance could result in "water breakthrough" and "water flush " because of heterogeneity of reservoir. As a rusult, waterflood efficiency of several oil well is bad. To disprosal and decrease the damage of the "water breakthrough" and "water flush", people launched operation of in-depth profile control. But because of peculiar characteristic of offshore oilfield, such as the short of water, small area of platform for operation, and high demand of environmental protection, the requirement is more higher while opreating in offshore oilfield. thus, waterflood efficiency of several oil well is bad. To improve waterflood efficiency, people launched operation of in-depth profile control. Because of peculiar characteristic of offshore oilfield, such as the short of water, small area of platform, and high demand of environmental protection, the requirement is more higher while opreating in offshore oilfield. Thus, we can't copy the technology of land oilfield easily. We selected the dispensation of aqueous media type emulsion and prepolymerized resin. Stability of crosslinking system with resin is good. Coefficient of blankig off is more than 95%. We did displacing experimen with microscope simulation model established, in order to obverse the flow of crosslinking system with aqueous-media dispersing type emulsion through porous media. After the crosslinking system became weak gel, crosslinking system had the contribution of displace. Meanwhile, weak gel turned into viscoelastic behavior particle during moving. There particle moved and been captured to blank off flow channel, so that sweep efficiency of injected water became biger. Weak gel had the contribution of adjusting profile. Reaction kinetics of crosslinking system with aqueous-media dispersing type emulsion was studied. And the viscosity description was improved. The mathematical model for fluid flow through porous media of triaxial three-phase nine components was established on the considered of physicochemical mechanism such as degrade, absorbing, permeability plugging.The model was computed with the advanced method of IMPES which could overcame the dispersion and vibration of number. It advanced the stability and dependability of numrical calculation.On the basis of Chengdao Oilfield reservoir, the affects of reservoir parameters, components parameters, injected parameters to enhance oil recovery were analysied quantitatively by use of the model. The decision model about selecting well was established with artificial neural network. The model considered the affects of aborbing capacity of input well, formation heterageneity, production performance of communicate wells. And illustration descriped that CB1B-6 well is fit for in-depth profile control and flooding. This could utilize the existing data, decrease the affect of human factor, and improved the stability and scientific grade. The effectivenesses of different construct scheme to CB1B-6 were predicted with numerical model. At last, the best crosslinking system volume was optimized according to economin evaluation. Jet flow mixer was designed by the jet flow theory. The appropriate line mixer was selected. Construction technology of combination in-depth profile control and flooding was studied which is for the sake of construst on the platform in offshore oilfield. In-house experiments were developed. Aqueous-media dispersing type emulsion could be satisfied for offshore oilfield. The new technology extends a new thinking to improve oil recovery at the later stage of water flooding for offshore oilfield.