The structure and properties of NBR and its composites coupled with different particle size of recycled polytetrafluoetylene (R-PTFE) are investigated. The results show that R-PTFE has a positive effect on NBR enhancing the curing properties of materials, mechanical properties, solvent resistance of NBR when the particle size of R-PTFE less than 200 mesh. However, when it is 200 mesh, R-PTFE is not easily dispersed in the NBR matrix, resulting in decreasing the properties of NBR/R-PTFE composites.
Vacuum heat insulating tubing is an important wellbore heat insulating facility for heavy oil thermal recovery at present. Its heat insulating performance directly affects the thermal recovery efficiency. The research on the heat insulating system of vacuum heat insulating tubing is of great significance to improve and improve the heat insulating performance and enhance the thermal recovery of heavy oil. This paper summarizes and analyses the current research status of vacuum insulated tubing insulation system. It elaborates the insulation structure, insulation materials, annular air charging and vacuum pumping, insulation coating and so on. It provides reference and reference for the future research of vacuum insulated tubing. 12
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