What is a high viscosity oil?

Although there are different definitions, the upper limit for heavy oil is 22°API and the viscosity is 100cp. Super heavy oils and natural bitumen are also part of heavy oils, which have lower API and higher viscosity . Light or medium oil migrates into the trap after being expelled from the source rock.

What causes high viscosity in heavy oil with high water content?

The primary factor contributing to viscosity elevation in heavy oil with high water content is the formation of W/O emulsion, where the efficacy of oil-soluble viscosity reducer in reducing viscosity is notably constrained. 3.3. Catalytic viscosity reducer

Is a viscosity reducer effective in oilfield applications?

The oil droplets dispersed in the viscosity reducer in the field are larger than in the laboratory-dehydrated crude oil, leading to significant differences between the efficacy in oilfield applications and laboratory evaluations. . 3.1.1. Anionic surfactant

Can cationic and anionic surfactants reduce heavy oil viscosity?

The combination of cationic and anionic surfactants has been reported to effectively reduce the heavy oil viscosity. Tian et al. developed a complex system of dodecylamine and dodecanoic acid, which emulsified heavy oil and reduced the viscosity from 1.27 × 10 4 mPa·s to 546 mPa·s.

What is the viscosity reduction rate of heavy oil?

This viscosity reducer also has salt resistance, withstanding a salt concentration of 2.26 × 10 5 mg·L −1. The heavy oil viscosity reduction rate in China's Tahe, Canada, and Venezuela can reach 99 %. Liu et al. synthesized an anionic-nonionic surfactant alcohol ethoxylate sodium hydroxypropyl (AEOSHS).

Is there a sustainable approach to heavy oil viscosity reduction?

First, the thickening mechanisms of heavy oil remain inadequately understood. Second, there is a need to develop effective viscosity reducers for heavy oil. Additionally, the application of these viscosity reducers poses further questions. Lastly, achieving a green and sustainable approach to heavy oil viscosity reduction is a significant concern.