Hydrate Formation/Dissociation in (Natural Gas + Water + Diesel Oil) Emulsion Systems

Chang-Sheng Xiang, Bao-Zi Peng, Huang Liu, Chang-Yu Sun, Guang-Jin Chen and Bao-Jiang Sun
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Chang-Sheng Xiang: School of Petroleum Engineering, China University of Petroleum (Huadong), Qingdao 266580, China
Bao-Zi Peng: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Huang Liu: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Chang-Yu Sun: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Guang-Jin Chen: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Bao-Jiang Sun: School of Petroleum Engineering, China University of Petroleum (Huadong), Qingdao 266580, China

Energies, 2013, vol. 6, issue 2, 1-14

Abstract: Hydrate formation/dissociation of natural gas in (diesel oil + water) emulsion systems containing 3 wt% anti-agglomerant were performed for five water cuts: 5, 10, 15, 20, and 25 vol%. The natural gas solubilities in the emulsion systems were also examined. The experimental results showed that the solubility of natural gas in emulsion systems increases almost linearly with the increase of pressure, and decreases with the increase of water cut. There exists an initial slow hydrate formation stage for systems with lower water cut, while rapid hydrate formation takes place and the process of the gas-liquid dissolution equilibrium at higher water cut does not appear in the pressure curve. The gas consumption amount due to hydrate formation at high water cut is significantly higher than that at low water cut. Fractional distillation for natural gas components also exists during the hydrate formation process. The experiments on hydrate dissociation showed that the dissociation rate and the amount of dissociated gas increase with the increase of water cut. The variations of temperature in the process of natural gas hydrate formation and dissociation in emulsion systems were also examined.

Keywords: hydrate; emulsion; formation; dissociation; solubility (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
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