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本文研究了采用化学处理剂改善南海高含蜡原油的低温流动性,结果表明,添加150ppm EVA复合化学处理剂,原油低温流动性得到明显改善,凝固点由32℃降至11.5℃,表观粘度降低86.9％,1;℃时屈服值降低98％。同时考察了添加温度,冷却速度以及化学处理剂的化学组成和结构对改善原油低温流动性的影响。根据南海高含蜡原油中蜡的组成和正构烷烃的碳数分布及其对不同结构的EVA的感受性,讨论了化学处理剂改善原油低温流动性的机理,指出,EVA中乙烯链长与原油中正构烷烃链长相近时才能形成共晶,起到改变原油中蜡的结晶形态的作用,达到降凝减粘效果。
In this paper, the chemical treatment agent was used to improve the low temperature fluidity of high waxy crude oil in the South China Sea. The results show that the low temperature fluidity of crude oil is obviously improved by adding 150ppm EVA compound chemical treatment agent, the freezing point is reduced from 32 ℃ to 11.5 ℃ and the apparent viscosity is decreased 86.9%, 1; yield value decreased by 98%. At the same time, the effect of adding temperature, cooling rate and chemical composition and structure of chemical treatment agent on the improvement of low temperature fluidity of crude oil were also investigated. According to the composition of wax and the carbon number distribution of n-paraffins in South China Sea high waxy crude oil and their different sensitivities to EVA with different structures, the mechanism that chemical treatment agents improve the low temperature fluidity of crude oil is discussed. When the paraffin chain length is similar, the eutectic can be formed and the crystal form of the wax in the crude oil can be changed to achieve the effect of reducing the viscosity and reducing the viscosity.