Analysis of Reservoir Performance of Messoyakha Gas Hydrate Field

The Messoyakha Gas Field is located in Siberian permafrost. The field has been described as a free gas zone, overlaid by hydrate layer and underlain by an aquifer of unknown strength. The field was put on production in 1970 and has produced intermittently since then. Some characteristic observations were increase in average reservoir pressure during shut-in, perforation blocking due hydrate formation and no change in gas-water contact. It is believed the increase in reservoir pressure was caused by the hydrate layer dissociation, rather than aquifer influx. The objective of this study was to use numerical model to analyze the observed production data from the Messoyakha field. In this study, a range of single-well 2D cross-sectional models representative of Messoyakha have been developed using the TOUGH+Hydrate reservoir simulator. The simulation results were then analyzed and compared with various field observations. Further, we have done a parametric study of reservoir properties of hydrate capped gas reservoir.

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