Investigating the Hydrate and Corrosion Inhibition Efficacy of Propargyl Alcohol: Applicable to Flow Assurance in...

Thermodynamic hydrate inhibitors have been extensively and effectively used to mitigate hydrate crystal formation and deposition in oil and gas pipelines. However, their high dosages and incompatibilities with corrosion inhibitors have always been a challenge. Therefore, in this work, we investigate the efficacy of a dual nature chemical, propargyl alcohol (POH), for inhibiting natural gas hydrate and corrosion. Herein, we systematically evaluate the hydrate formation kinetics, phase equilibria, resistance to flow, hydrate morphology (visual information on hydrate formation and dissociation), and corrosion inhibition properties of POH and compare them with methyl alcohol (MeOH). Gas hydrate studies were performed while employing a high-pressure visual torque sensor-based reactor and pure methane gas at a pressure of 8.0 MPa. Additionally, the corrosion efficacy of POH and MeOH was investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) methods, using CO₂-saturated saline water (3.5% NaCl) as a corrosive medium. Results reveal the thermodynamic hydrate inhibition and corrosion efficacy of POH. This study offers new insights into hydrate management and corrosion prevention for oil and gas pipelines.