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RISS 인기검색어
- 검색키워드
- 저자 : Eric F. May (검색결과 2 건)
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Hydrate plug formation risk with varying watercut and inhibitor concentrations
Sohn, Young hoon,Kim, Jakyung,Shin, Kyuchul,Chang, Daejun,Seo, Yutaek,Aman, Zachary M.,May, Eric F. Elsevier 2015 Chemical engineering science Vol.126 No.-
<P><B>Abstract</B></P> <P>Hydrate formation introduces a potential operating and safety hazard in subsea oil and gas pipelines. The aggregation and deposition of hydrate particles together increase the resistance-to-flow in the pipeline, which dissipates the energy available to transport the resource and may even lead to a plug that blocks flow completely. The effects of 20–100% watercut and hydrate thermodynamic and kinetic inhibitors on both hydrate growth rate and resistance-to-flow have been studied in a high-pressure autoclave apparatus. The highest resistance-to-flow was observed for systems with around 60% watercut, for which oil-continuous condition existed for the majority of the hydrate growth period with free water available to bind both hydrate aggregates and deposits. Severe and periodic local maxima in the torque required to maintain a constant rotational speed were repeatedly observed in the autoclave at 60% watercut; these could be partially suppressed by adding 10wt% MEG to the water phase. The resistance-to-flow signal was fully suppressed in two system configurations: (i) 10wt% MEG with 0.5wt% of PVCap, a hydrate kinetic inhibitor; and (ii) 30wt% MEG. The results suggest that the injection of a thermodynamic inhibitor at less than 25% of the full inhibition requirement could be sufficient to alleviate the risk of a hydrate blockage. A simple model to describe hydrate growth in water- and oil-continuous systems was successfully deployed to predict hydrate growth rate in systems with varying watercut, with and without inhibitor.</P>
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Corey J. Baker,Thomas J. Hughes,Brendan F. Graham,Kenneth N. Marsh,Eric F. May 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-
An industrial hydrocarbon dew point detector based on infrared absorption spectroscopy was tested down to a temperature of 243 K and at pressures up to 10 MPa. Dew temperatures were measured isobarically for pure ethane and mixtures of methane + {propane, isobutane, or n-butane}. Ethane dew temperatures were within ±0.38 K of the reference equation of state prediction. Mixture dew temperatures below the cricondentherm were determined within 0.7 K. At higher pressures, dew temperatures were over-predicted due to the rapid changes in gas density with temperature. Improved performance could be achieved by isochoric operation, and by reducing temperature scan rates.
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