Journal
ENERGY
Volume 229, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.120755
Keywords
Anti-agglomeration effect; Biosurfactant; Rhamnolipid; Trehalose lipids; Oil and gas
Categories
Funding
- National Natural Science Foundation of China [51976227, 52004261]
- Guangdong Province MEDP Fund [GDOE [2019] A54, GDOE [2019] A39]
- PetroChina Innovation Foundation [2019D50070216]
- Guangdong Special Support ProgramLocal innovation and entrepreneurship team project [2019BT02L278]
- Fund of Key Laboratory of Gas Hydrate Chinese Academy of Sciences [E029020501]
- Youth Innovation Promotion Association CAS [2020344]
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The mixed biosurfactants showed excellent anti-agglomeration effect by greatly reducing the force needed for system flow and decreasing the dosage needed for anti-agglomeration through synergistic effect. Additionally, they could accelerate gas dissolution process without significantly altering hydrate growth rate, contributing to preventing hydrate blockage in oil and gas system.
Hydrate formation and agglomeration in oil and gas pipelines is a serious safety and environmental problem. An eco-friendly and effective anti-agglomerant is a promising candidate to mitigate gas hydrate blockage risk environmentally and economically. This study evaluated the anti-agglomeration effect of mixed biosurfactants (rhamnolipid + trehalose lipids) through the torque changes during the CH4 hydrate growth process. The results showed that mixed biosurfactants greatly decreased the force needed for the system to be flowing. A surprising synergistic effect functioned for mixed biosurfactants, leading to the decease of dosage needed for anti-agglomeration. The CH4 hydrate formation kinetics was also studied, and the data revealed that mixed biosurfactants could fasten the gas dissolution process while did not greatly change the hydrate growth rate. In addition, the Raman spectra for CH4 hydrate formed with mixed biosurfactants were obtained and analyzed. It demonstrated that the added biosurfactants decreased the hydration number by increasing the small cage occupancy. Meanwhile, the hydrate surface became regular and smooth, which contributed to preventing hydrate blockage in oil and gas system. (C) 2021 Elsevier Ltd. All rights reserved.
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