Sheep Non-alkali Composite Wood Blocks In Dagang Oilfield Flooding Injection Parameter Optimization Indoor Experimental Study

Poly table composed of polymer and surfactant binary compound system in solving the problem of oilfield drilling technology has been widely used,especially for high water-cut stage of oil field,and has been widely recognized,can significantly improve the overall oil recovery,broader economic benefits are obtained.The principle is to use the adhesive properties of the polymer,increase the viscosity of the displacing phase,improve the flow ratio,and can effectively expand the affected volume and increase the amount of oil production.Surfactant can change the oil-water interface and the interface tension and rock skeleton interface,improve the cohesion between capillary force and oil molecules,improve the wash oil in the swept volume efficiency.Polymer and surfactant poly table of binary complex system can be increased from expanding swept volume and oil washing efficiency two aspects to improve the overall oil recovery.But due to a wide range of types of polymer and surfactant,the nature of the differences,as well as the formation of crude oil properties,formation water salinity and the influence of formation temperature,in the choice to consider more factors,drug choice suitable for reservoir block agent is particularly important.Meanwhile,for injected slug size of binary system,injected slug each drug concentration and injection timing has more stringent requirements,this article from the drug screening as well as the best way to inject optimization,select suitable target block poly(table 2 and the optimum parameters of the injection of asp system,for oil field drilling and the increase of economic benefits to provide reliable theory basis,has guiding effect to the oilfield production.This paper in view of the sheep in dagang oilfield the actual reservoir geological characteristics of the wooden blocks and blocks the current status of development through indoor physical simulation experiment on block binary compound flooding is studied.On 4different polymer viscosity-temperature,strong relationship test,as well as different isothermal polymer thick,under the condition of the same polymer such as strong stability test under different temperature,choice of polymer KYPAM as a binary system.By means of anionic,cationic and nonionic surfactant in the three types of 6 interfacial tension determination of determination,concentration and adsorption quantity,select a concentration of 0.3% PS-2 as the best potion.Injection capacity and evaluation of different concentrations of binary system to match the formation permeability,the final choice the best injection of polymer concentration of 2000 mg/L,best injected slug size 0.3 PV,injection timing,the sooner the better injection when moisture content is 80%,the overall recovery reached 53.1%.In the end,the displacement technique of binary composite flooding of sheep and wood block in dagang oilfield is given.