Screening and field application of crude oil pour point depressant in typhoon mode of an oilfield group in the South China Sea
In order to cope with the problem of stopping and restarting the typhoon mode,an oilfield group in the South China Sea carried out the evaluation and screening of 7 kinds of pour point depressants according to the on-site working conditions,and optimized the acrylate terpolymer pour point depressant PPD-03.The field evaluation results showed that when the dosage concentration was 1 500 mg/L,the condensation point of the mixed crude oil was 13℃,and the pour point reduction amplitude was 10℃.The field application test of the concentration gradient pour point depressant carried out at the starting concentration of 1 000 mg/L shows that the freezing point of the crude oil mixed with the additive fluctuates sta-bly in the range below 17℃(seabed temperature),and the pour point depressant PPD-03 has a significant effect on ensuring the low-temperature fluidity of crude oil under the typhoon mode.The results of the compatibility field test show that when the pour point depressant PPD-03 is injected in the upstream of the mixed crude oil,the oil content(OIW value)in the water of the primary separator,the secondary separator and the external drainage of the downstream integrated treatment system fluctuates and tends to be stable in the range,and the filling of the pour point depressant basically does not affect the water quality of the plat-form after treatment.
South China Sea oilfield grouppour point depressanttyphoon modeon-site evaluationfield application
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