Vol.5 No.2 2012

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Research paper : Development of methane hydrate production method (J. Nagao)−93−Synthesiology - English edition Vol.5 No.2 (2012) 1.4 mTubePorous spacer3.2 msandwaterwellPumpLow temperature roomgas, water inletHoleswall(Laser position meter)Gas and waterControl PCSampling padWater/sandSeparatorGasDe-pressuring tankwater saturation of 40 %. From these results, gas production shows a peak during the first period, indicating that mass transfer is predominant in the dissociation process. Gas production experiments conducted using depressurization to ascertain the relationship between the degrees of reduction in pressure and the gas production rate have been underway. The obtained results will be compared with those obtained from a numerical simulation study conducted using the MH21-HYDRES production simulator. This study will contribute to the first field production test to be conducted off the shore of Japan in FY 2012.AcknowledgementsThis study was financially supported by the Research Consortium for Methane Hydrate Resources in Japan (MH21 Research Consortium) to carry out the Methane Hydrate R&D Program conducted by METI. I thank Dr. Hideo Narita, Dr. Yoshihiro Konno, and Dr. Hiroyuki Oyama of AIST for their valuable suggestions in the preparation of this manuscript.020004000600080001000012000140000100200300400500600700800Time (min)Time (min)200150100500200150100500Cumulative gas production (L)Cumulative water production (L)Gas production rate (L/min)Water production rate (L/min)Cum.RateCum.Rate020406080100120140051015202530354045(a) Gas production behaviour(b) Water production behaviourFig. 6 Predictions of gas and water productions based on depressurization experiments in the large-scale laboratory reactor using the MH21-HYDRES production simulatorA peak during the first period in gas production behaviour indicates that mass transfer is predominant in the dissociation process.Fig. 5 Schematic illustrations of the large-scale laboratory reactorTo aid the development of technologies for advanced production methods and to analyze the impact of sand production, skin formation and flow obstructions, the highly sensitive temperature and pressure sensors with a wide range and fluid flow metres are arrayed to side holes of the vessel. To evaluate the sand production phenomena, a sand screen is fitted to a well tube. Water and fine sand are collected in a sampling pod arrayed to the water/gas separator. The overall gas volume is measured at de-pressuring tank arrayed to the water/gas separator. All measured data were collected in a PC automatically.(a) High-pressure vessel of the large-scale laboratory reactor(b) Schematic flow diagram of the large-scale laboratory reactor

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