Experimental and numerical study on dynamic scaling mechanism of glass fiber reinforced plastics pipeline

Abstract The test and evaluation method of dynamic scaling for crude oil transportation pipeline under oil field environment has been presented based on self-developed dynamic scaling testing device, by which the dynamic cyclic fouling experiments of GFRP pipeline under transportation condition have been conducted, and the dynamic amount of scale has been obtained under different temperatures, fluid velocities, exposure times and metal ions. Secondly, the effects of temperature, fluid velocity and exposure time on dynamic scaling rate of GFRP pipeline have been analyzed from macroscopic perspective by using grey correlation method, by which the correlations between dynamic scaling rate of GFRP pipeline and those factors are obtained. Thirdly, SEM and XRD are used to investigate surface morphology, composition and structure of scale from microscopic perspective, by which the effect of metal ion on the scaling mechanism has been analyzed qualitatively. Finally, based on experimental results, the structure model of Ca6−xMgx(CO3)6 and Ca6−xFex(CO3)6 has been established by using materials studio, and the elastic property parameters of different structure model have been calculated, by which the effect of metal ions on scaling mechanism has been investigated quantificationally. Dynamic scaling mechanism of GFRP pipeline is revealed and the corresponding anti-scaling measure is presented.