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Using Polymer EOR to Reduce Carbon Intensity While Increasing Oil Recovery
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, IOR 2021, Apr 2021, Volume 2021, p.1 - 20
Abstract
Reducing the carbon footprint during crude oil extraction is a growing challenge among operators and regulatory institutions. Sustainable solutions need to be implemented for reaching the net-zero production emission target by 2050. Besides the climate challenges, the industry is facing one of the worse crisis of its history. Maximizing production and reserves of existing assets in a sustainable and cost-efficient way are therefore paramount.
Polymer flooding, with more than 300 projects worldwide, is a proven and cost-efficient technique to recover more oil in a shorter timeframe; but can the technology also aid in reducing greenhouse gas emissions? This article addresses this question by comparing the GHG emissions associated with standard waterflooding operations and polymer EOR processes
Our approach is based on the determination of energy consumption related to different elements of the oil production cycle assisted by water or polymer injection. The total calculation includes water treatment, chemicals manufacturing, transport, polymer injection unit, injection pumps, artificial lift, produced fluids separation, oil heating and oilfield chemicals consumption.
GHG emissions associated with oil transport, refinery, water disposal, and gas processing were not included in the study and will simply require updating the model with more data inputs.
The emission factors of a series of industrial polymers (including partially hydrolyzed polyacrylamides, sulfonated polyacrylamides, and HT/HS polymers in both powder and emulsion forms) were calculated considering the contributions of the raw materials and energy spent during the polymerization and the conditioning processes.
The methodology was applied to different field cases available in the literature to determine the reduction of GHG emissions associated with the reduction of water cut. The results indicated that polymer flooding was able to reduce the carbon intensity of conventional oil production by a factor of 2 to 6 compared to standard waterflooding operations, thus helping save up to 80% of water use. The results are promising for an emission free future in oil and gas industry.
The model presented in this paper can complement any reservoir simulation package and can give an estimation of reduction of CO2 emissions and water consumption compared to water injection. As an illustration, the model was applied to a pilot simulation using DOE Polymer Flooding software to compare CO2 footprint of waterflooding vs polymer flooding.