Preparation Of Meroporous And Hollow Nanoparticles And Study Of Stable Foam Performance

Foam flooding is favored by the majority of oilfield developers,but the foam is a thermodynamics unstable system.When the foam contacts the oil phase,the foam will rupture because the surfactant on the liquid film is adsorbed by the oil/water interface.Therefore,the research on foam fluid with super strong stability is the focus of foam flooding technology.Compared with surfactants,the foam liquid film formed by nanoparticle adsorption has higher mechanical strength and toughness for the interface adsorption performance of nanoparticles,which greatly enhances the stability of the foam.Mesoporous nanoparticles and hollow nanoparticles not only have the advantages of traditional solid nanoparticles in terms of foam stabilization,but also can be more stable in foam systems with their ultra-low density advantages.These provide a new idea for this article.In the laboratory,mesoporous nano-silica?Si O₂?and hollow nano-silica particles were synthesized by the template method.Through the optimizing of experimental conditios,these were synthesized that mesoporous Si O₂ with a main particle diameter of 35 nm,pore diameter of 4.5 nm,and surface to volume ratio of 790 m²/g,and hollow Si O₂ with a main particle diameter of 43 nm,core of 35 nm,and surface to volume ratio of 430 m²/g.The surface of the synthesized nanoparticles was modified by 3-Chloropropyltrimethoxysilane coupling agent.The foaming fluid preparation experiment was carried out by using the Waring Blender method.The amount of sodium dodecyl sulfate?SDS?was selected to be 0.288 wt%for foaming experiment research.By researching the foaming experiments of three kinds of nanoparticles,solid nano-Si O₂ particles,mesoporous nano-Si O₂ particles,and hollow nano-Si O₂ particles,the foam stabilization is the best when the amount of nanoparticles is 0.1wt%.And both the mesoporous nano-Si O₂ particles and the hollow nano-Si O₂ particles have better stability to foam than solid nano-Si O₂ particles,and their stability of foam has increased by 8.7%and 11.3%,respectively.3-Chloropropyltrimethoxysilane coupling agent?CPTMO?was used to modify the hydrophilic mesoporous and hollow particles,and the products were introduced mesoporous-2,mesoporous-3,and hollow-2 and hollow-3 were used for foaming experiments,the contact angle is 80°,105°,83°and 108°respecatly.In the water foaming system,compared with the foaming system without particles,the foaming volume of the foaming system with modified mesoporous or hollow nano-Si O₂ has little effect,but the foam half-life has been significantly improved,and the foam composite index has been increased by 10.9%and 14.9%;In oil-water foaming system,the foam comprehensive index increased by 38.4%and 40.3%,respectively,effectively improving the foam's oil resistance.Experiments show that the mesoporous and hollow nanoparticles have better foam stabilization performance,which optimizes the traditional solid nanoparticle foam stabilization experiments and has certain application value.