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A Multi-Component and Multi-Functional Synergistic System for Efficient Viscosity Reduction of Extra-Heavy Oil.

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  • 1Petroleum Engineering Technology Research Institute, Northwest Oilfield Company, Sinopec, Urumqi 830011, China.

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Summary

Coal tar by-products, specifically washing oil, effectively reduce extra-heavy oil viscosity. This low-cost method significantly improves oil fluidity, overcoming traditional limitations in exploitation and transportation.

Keywords:
aromatic compoundblending and viscosity reductionextra-heavy oilmulti-functionalsurfactantswashing oil

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Area of Science:

  • Petroleum Engineering
  • Chemical Engineering
  • Materials Science

Background:

  • Extra-heavy oil in China's Tahe Oilfield exhibits extremely high viscosity due to asphaltene and resin content.
  • High viscosity poses significant challenges for oil exploitation and transportation.
  • Traditional viscosity reduction methods are limited by high blending ratios and light crude oil scarcity.

Purpose of the Study:

  • To investigate the efficacy of coal tar by-products, specifically washing oil, as a low-cost viscosity reducer for extra-heavy oil.
  • To develop an efficient and multi-component system for viscosity reduction and improved fluidity.
  • To elucidate the mechanism of viscosity reduction by washing oil components.

Main Methods:

  • Utilizing coal tar and washing oil for extra-heavy oil blending and viscosity reduction.
  • Employing Gas Chromatography-Mass Spectrometry (GC-MS) to analyze the composition of washing oil.
  • Developing and testing a multi-component viscosity reduction system with washing oil, toluene, xylene, and surfactants.

Main Results:

  • Washing oil demonstrated high efficiency in reducing extra-heavy oil viscosity, achieving 1214 mPa·s at a 0.25 dilution ratio (99.8% reduction).
  • GC-MS analysis revealed washing oil is rich in aromatic hydrocarbons and aromatic heterocyclic rings.
  • A synergistic system combining washing oil with toluene, xylene, and surfactant yielded superior viscosity reduction.

Conclusions:

  • Washing oil is a cost-effective and efficient viscosity-reducing agent for extra-heavy oil.
  • The proposed multi-component system offers a low-cost, high-efficiency solution for viscosity reduction in the Tahe Oilfield.
  • Aromatic hydrocarbons and heterocyclic rings in washing oil play a key role in dispersing asphaltene aggregates, enhancing fluidity.