The Effect Of Shearing On The Microstructure Of Polymer Solution

Polymer solution plays a very important role in chemical flooding technology of our country, it is effective to increase production of reservoir through establishing effective viscosity in the formation, lower reservoir formation heterogeneity. The elements of polymer molecules on microscopic are molecular weight, degree of hydrolysis, the kind of group, molecular structure and so on, which can control the form of polymer in water, thus control the macro-performance of polymer solution.And the unique structure, the radius of fluid mechanics and the molecular inter-atomic play the decisive influence of polymer solution. Meanwhile through the filed practice, the shear of immediate vicinity of wellbore has a severe damage on the performance of polymer solution. Therefore, building the simulation experiment of shearing of immediate vicinity of wellbore is an important foundation of developing resitant-shear polymer, performance optimization and injection technology.According to actual conditions of Bohai SZ36-1 reservoir, with the simulator of immediate vicinity of well bore, research the whole process and extent of damage of shearing damage.To research what kind of structure of polymer in water should be and what kind of situation can help to reduce the damage of shearing, combing macroscopic and microscopic of phenomenon, adopts the dynamic and static ligh scattering, environmental scanning electron microscope,fluorescence specturn to research the difference of molar mass, root mean square radius of gyration, hydrodynamic radius, microstructure and hydrophobic micro area between before and after shearing. Simultaneously, adopts one-dimensional sand filling tube flow experiment, rheometer and brookfield viscometer to research the resistance coefficient and residual resistance coefficient, viscoelasticity, appearant viscosity between before and after shearing.To explre the microscopic characterization of experimental methods of AP-P4 and dendrimer solution, and the extent of damage by different concentration, polymer stracture in water and strength of shearing.