The Synthesis And Characterization Of Micron-Sized AM/PF Polymer Microspheres In Temperature Resistance

It is more serious in most of the reservoir heterogeneity in China.At present,it has entered the stage of high water cut and late development,which requires deep profile control.Polymer microspheres are widely used because of their advantages of controllable size and strong deformation,but their temperature resistance is poor and it is not suitable for most high temperature reservoirs in China.In this paper,water soluble phenolic resin(PF)and acrylamide(AM)were used as the main monomers for the synthesis of temperature-resistant polymer microspheres,the effects of various factors on the synthesis of AM/PF polymer R microspheres by inverse emulsion synthesis were studied,including the type of solvent oil,the type and dosage of emulsifier,the HLB,the crosslinking agent and the dosage of initiator,the synthetic time of phenolic resin and the pH.And the R microspheres were obtained by optimizing the formula.In the characterization of R microspheres,it is found that the AM/PF system can be triggered under the condition of strong acid,but the emulsion is unstable at this time,so it is impossible to synthesize the polymer microspheres with high stability and good temperature resistance by inverse emulsion method.In addition,the AM/PF micro-scale polymer microspheres with particle diameters between 100-2000 nm were synthesized by inverse micro-suspension method in this paper.The morphology,particle size distribution and temperature resistance of microspheres were analyzed by means of SEM,TG-DSC and FT-IR.The results show that because of the different polymerization rates of AM and PF,the two spheres are formed and the adsorption phenomenon occurs.The swelling performance and temperature resistance of microspheres were satisfactory in AM/PF=12:8.The microspheres can eventually withstand temperatures above 90 d in 120 ?.By analyzing the final products obtained from the temperature-resisting experiment of microspheres,the method of forming ball and the degradation process of inverse suspension polymerization products and inverse micro-suspension polymerization were studied preliminarily.In inverse polymerization microspheres,phenolic resin is coated on the surface of acrylamide resin microspheres in the form of several small spheres,and the acrylamide microspheres are covered with full surface area,so it has a temperature-resisting effect.In inverse micro-suspension polymerization,due to the small size,the phenolic resin microspheres cannot be attached to the surface of the microspheres and are fully coated.Therefore,in the double spheres exposed to high temperature environment,acrylamide microspheres are degraded quickly,and only the remaining swelling phenolic microspheres are left.Compared with the form method,these microspheres have the worse temperature resistance.