After the production of a fiberglass pipeline for surface gathering and transportation in a certain oilfield,wax blockage occurred,seriously affecting the normal production of the oilfield.To clarify the causes and mechanisms of wax formation in fiberglass pipes,samples were taken from three in-service fiberglass pipelines with different degrees of wax formation,and comparative experimental studies were con-ducted,including macroscopic inspection,physical and chemical tests,and wettability analysis.The results showed that there were no sig-nificant differences in the composition structure,resin content,hardness,and curing degree of the three glass fiber reinforced plastic speci-mens,which met the standard requirements of glass fiber reinforced plasticpipe.They all showed a super lipophilic state towards diesel and no significant difference in wettability.The difference in wax deposition degree was mainly caused by the operating temperature of the pipe-line,and low flow rate and low gas-liquid ratio accelerated wax deposition.The waxing mechanism of fiberglass pipes is basically the same as that of steel pipes,which is a molecular diffusion mechanism.However,the critical surface tension,thermal conductivity,and roughness of fiberglass pipes are lower,making them less prone to wax crystal deposition and aggregation,demonstrating better anti-waxing perform-ance.Reducing the surface tension of the pipe and achieving an oil repellent state will be an effective way to improve the anti-waxing per-formance of fiberglass pipes.
关键词
集输管线/含蜡原油/玻璃钢管/结蜡原因/结蜡机理
Key words
gathering and transmission pipeline/wax containing crude oil/fiberglass reinforced plastic pipe/reason for wax formation/wax formation mechanism
维普
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