Study On The Characteristics And Appraise The Oil Displacement Effect Of Two Kinds Of Polymer Surfactant

With the exploitation of oil fields, water increase and production decline of oil wells has become a very common issue, the vast oil block of Daqing Oilfield has entered a high water cut stage, especially the secondary and tertiary layer,.. the remaining oil is also very rich in the formation after water flooding, thus ,initiating enhanced oil recovery techniques to ensure oil and gas production after water flooding is of great significance.Polymer Surfactant possess both the high-viscosity characteristics of polymer and the interfacial activity of surfactant, which has good emulsifying ability,strong viscosity increasing and flocculation, and has applicated in the oil exploitation relatively rapid in recent years as the important technical measure to enhance oil recovery after polymer flooding ,so it provided an effective way to drop the high containing water and raise the oil yield ,also obtained successful mine field test reports in the fourth,fifth,eighth and first plants of Daqing Oil Field。Polymer surfactant's structure also needs improving to make its performance more perfect as for as those blocks with poor reservoir properties. Directing at low-permeability sandstone geological features of Fuyang layer this paper, from the perspective of static and dynamic , to Refining and Haibo polymer surfactants, comparative evaluated their physical and chemical properties,pros and cons of oil displacement effect and the difference of dynamic retention in order to optimize more rational injection way, the specific studys are showed as follows:1 As to three kinds of different concentration (800mg/L, 1000mg/L, 1500mg/L) Refining,Haibo polymer surfactants solution , studied and analysed their viscosity properties (viscosity stability, anti-salt,anti-shear properties ),viscoelastic properties and emulsifying properties from static aspects, meanwhile comparied with ordinary polymer,the results show that: Haibo polymer surfactant have best performances as above except poor salt-resistant (but still stronger than the polymer), polymer's are the worst.2 From the dynamic aspects, appraised the flowing properties of two kinds different concentrations polymer surfactants solution in porous media by resistance coefficient and residual resistance factor; Second, basing the combination of analysing physical and chemical properties,flow performance of polymer surfactants solution, examined how their concentration and slug to influence flooding effect,eventually identified that utilizing the concentration of 1000mg/L Haibo polymer surfactant solution as displacement agent is most cost-effective, and the appropriate slug size is 0.7PV, the improvement range of oil recovery rate is up to 17% -19%; Finally, on the process of flooding by injecting different concentration,different slug sizes of polymer surfactant, contrasted the differences of dynamic retention in the formation between two kinds of polymer surfactants.