SPE Online Education
Process Safety of Hydrate Blockage Depressurization
Recorded On: 09/24/2020
Hydrate plugged a pipeline with gas flowing through water at elevated pressure, low ambient temperature, treated with a hydrate promoter and spiked with propane. Predictive methods accurately showed where the dominant blockage formed. During blowdown from 660 to 12 psia, hydrate redeposited in vent orifice. Field measured flow velocity reached 74 ft/s, wall shear at hydrate deposition reached 78 Pa. Hydrate deposited at that shear reduced the orifice area approximately by half, which extended the time to depressurize, affecting process safety. Blowdown time formula matched state-of-the-art multiphase transient simulation. Shear stress should be a common parameter reported by researchers in flow assurance.
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Hydrate Engineering (Digital Edition)
Dr. Taras Makogon
Flow Assurance Specialist
Dr. Makogon's primary focus is to help oil and gas companies solve complex fluid problems in operations, and to design new systems to prevent future problems based on experience. He has been gainfully employed in the energy industry helping people move faster and live longer. He has a mining physics Engineer degree from the Gubkin University, MBA in Finance from HBU and a Doctorate in ChemE from CSM, holds several patents and serves on the SPE Flow Assurance Technical Section. His hobbies are overclocking and molecular modeling.
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