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Research progress on supercritical CO2 thickeners.

Ming Zhou1, Ruifeng Ni2, Yaxiong Zhao2

  • 1State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China. mr.zhouming@163.com and School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan 610500, China and Reach Center of Energy Polymer, Southwest Petroleum University, Chengdu, Sichuan 610500, China.

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|May 6, 2021
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Supercritical carbon dioxide (scCO2) thickeners are crucial for enhancing oil recovery. These additives improve scCO2 viscosity, addressing limitations in fracturing and flooding operations for better oil and gas production.

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Area of Science:

  • Petroleum Engineering
  • Chemical Engineering
  • Materials Science

Background:

  • Supercritical carbon dioxide (scCO2) is utilized in enhanced oil recovery (EOR) techniques like CO2 fracturing and flooding.
  • The inherent low viscosity of scCO2 limits its effectiveness in proppant transport during fracturing and leads to poor sweep efficiency in flooding.
  • Addressing these limitations is critical for optimizing oil and gas production.

Purpose of the Study:

  • To systematically review and categorize supercritical carbon dioxide (scCO2) thickeners based on their molecular structure and thickening principles.
  • To analyze the properties, performance, and challenges associated with various scCO2 thickeners.
  • To assess the research progress and future prospects of scCO2 thickeners in the oil and gas industry.

Main Methods:

  • Classification of scCO2 thickeners into polymers, small molecular compounds, and surfactants.
  • Analysis of thickener properties including solubility, thickening effect, and optimal operating conditions.
  • Evaluation of existing challenges and research advancements in scCO2 thickening technology.

Main Results:

  • scCO2 thickeners, including polymers, small molecules, and surfactants, have been identified and categorized.
  • Key properties like solubility and thickening efficiency vary significantly among different thickener types.
  • Low viscosity of scCO2 poses challenges in fracturing (proppant carrying, filtration control) and flooding (gravity override, mobility ratio, sweep efficiency).

Conclusions:

  • Supercritical carbon dioxide (scCO2) thickeners offer significant potential for improving oil and gas recovery.
  • Effective thickeners can overcome the viscosity limitations of scCO2 in fracturing and flooding applications.
  • Further research and development of scCO2 thickeners are essential for advancing improved oil recovery (IOR) strategies.