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http://dx.doi.org/10.7842/kigas.2020.24.5.56

Experimental Study on the Inhibition Effect of PVCap to Prevent Formation of Hydrate in Subsea Flowline  

Kim, Young-Min (Petroleum&Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Choi, Jun-Ho (Institute of Technology, Gwang-Sung GM)
Lee, Jeong-Hwan (Dept. of Energy and Resources Engineering, Chonnam National University)
Publication Information
Journal of the Korean Institute of Gas / v.24, no.5, 2020 , pp. 56-64 More about this Journal
Abstract
This study presents the hydrate induction time of PVCap according to subcooling temperature, salt concentration, and MEG concentration in order to analyze the inhibition effect of PVCap in various production environments of offshore gas fields. A high-pressure hydrate generator was made for the hydrate formation experiments. It was verified that the apparatus had sufficient reliability by comparing the results of hydrate equilibrium conditions and induction time from the apparatus with published reference data. As the subcooling temperature increased from 6.1℃ to 12.1℃, the induction time of PVCap concentration of 0.1~1 wt% decreased. When the salt concentration increased from 3 wt% to 7 wt%, the induction time was reduced by up to 78% under the condition of 0.5 wt% PVCap due to polymer structure degradation by salt effect. In the case of HHI (hybrid hydrate inhibitor) made by mixing MEG 10 wt% and PVCap, the change in induction time was not large compared to PVCap 1 wt% due to the under-inhibition effect. On the other hand, the hydrate inhibition efficiency of HHI with MEG 20wt% increased 1.7 times compared to PVCap.
Keywords
hydrate plugging; subsea flowline; PVCap; subcooling temperature; induction time; MEG concentration;
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