Gas hydrate formation/deposition and corrosion in oil and gas pipelines pose serious flow assurance and environmental issues due to the use of high dosages of harmful chemicals/inhibitors. In this work, we investigated the efficacy of a plant-based additive, guar gum (GG), for natural gas hydrate and corrosion inhibition. Herein, we comprehensively evaluated the hydrate growth kinetics, resistance to flow, hydrate morphology (visual information on hydrate formation and dissociation), and corrosion inhibition properties. Hydrate formation experiments were performed at different water cuts ranging from 40 to 80% while employing a high-pressure visual torque reactor and a synthetic natural gas mixture of methane (92%), ethane (5%), and propane (3%) at 6.0 MPa pressure and 275 ± 0.5 K temperature. Electrochemical impedance spectroscopy (EIS) analysis, potentiodynamic polarization (PDP), surface morphology, and elemental analysis were conducted under varying concentrations of GG in 1 M HCl to evaluate the corrosion inhibition efficacy. The results reveal the ternary effect of GG while simultaneously preventing gas hydrate growth kinetics (75% reduction in hydrate conversion), agglomeration (3–4 times lower torque signals compared to the baseline), and corrosion (∼91% inhibition efficacy). This study offers new insights into hydrate management and corrosion prevention with a single dosage of additive, and also reduces carbon footprints.
Dubey et al. (Mon,) studied this question.
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