Preparation and Properties of Delayed Crosslinked Hydrogel for Temporary Plugging in Oil Pipeline
To realize the hot work of oil pipelines,a delayed crosslinked hydrogel was prepared by imidazolidinyl urea(UI)and chitosan to plug oil pipelines and isolate oil and gas.The structure of the hydrogel was characterized,the gel-forming properties and rheological properties of the hydrogels were studied,and the plugging process in the pipeline was simulated.The results show that the hydrogels are cross-linked by formal-dehyde released from UI(not less than 0.4 mol/L)and a 1％chitosan solution.The rheological kinetics of hydrogels indicates that hydrogels ex-hibit a delayed crosslinking effect.Rheological results show that the gel strength increases with the increase of UI concentration,and the hydro-gels exhibit the good thixotropic properties.The hydrogel has a good plugging effect in simulated pipeline,making it promising application in tem-porary plugging of actual oil pipelines to realize the hot work of pipelines.
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维普
