This article refers to what PPD can undermine the special structure of thick crude oil, and crude oil viscosity and pour point reduction in the chemical agent.

本文所说降凝剂是指能破坏特稠原油的结构力，使原油粘度和凝点降低的化学剂。

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Viscosity: viscosity is the crude oil in the flow caused by the internal frictional resistance, crude oil viscosity depends on temperature, pressure, dissolved gas and its chemical composition.

粘度：原油粘度是指原油在流动时所引起的内部摩擦阻力，原油粘度大小取决于温度、压力、溶解气量及其化学组成。

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A method to reduce the viscosity of crude oil in oil production using combination of chemical and physical viscosity - reducing means was introduced.

介绍了稠油开采过程中因稠油粘度过高采用的物理与化学相结合的降粘方法。

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Sweet light crude oil yields the most gallons of gasoline per barrel of oil and since it has low viscosity and low density, it is comparatively inexpensive to pump, transport, and refine.

FORBES: China's Not Going Green

The majority new oil being developed are heavy, sour crude oils which have a high sulfur content, high viscosity, and high density.

FORBES: China's Not Going Green