Preprint Article Version 1 This version is not peer-reviewed

Influence of Reservoir Stimulation on Marine Gas Hydrate Conversion Efficiency in Different Accumulation Conditions

Version 1 : Received: 10 December 2017 / Approved: 11 December 2017 / Online: 11 December 2017 (07:30:36 CET)

A peer-reviewed article of this Preprint also exists.

Yang, L.; Chen, C.; Jia, R.; Sun, Y.; Guo, W.; Pan, D.; Li, X.; Chen, Y. Influence of Reservoir Stimulation on Marine Gas Hydrate Conversion Efficiency in Different Accumulation Conditions. Energies 2018, 11, 339. Yang, L.; Chen, C.; Jia, R.; Sun, Y.; Guo, W.; Pan, D.; Li, X.; Chen, Y. Influence of Reservoir Stimulation on Marine Gas Hydrate Conversion Efficiency in Different Accumulation Conditions. Energies 2018, 11, 339.

Journal reference: Energies 2018, 11, 339
DOI: 10.3390/en11020339

Abstract

Based on the geologic conditions of natural gas hydrate (NGH) accumulations in the Shenhu area, northern slope of the South China Sea, this paper used a method of combining reservoir stimulation technique (RST) with depressurization to investigate the conversion efficiency of marine NGH reservoirs in different intrinsic permeability and initial NGH saturation conditions, and analyze the influence of variably-stimulation effect on marine NGH conversion efficiency in different accumulation conditions, provided a reference scheme for improving the NGH conversion efficiency in the Shenhu area. In this work, we performed calculations for the variations in CH4 production rate and cumulative volume of CH4 in different initial NGH saturation, intrinsic permeability and stimulation effect conditions, variance analysis and range analysis methods were used to analyze the significance of these key factors and their interaction, and investigated the sensitivity of stimulation effect on NGH conversion efficiency, respectively. The simulation results showed that stimulation effect have a significant influence on NGH conversion efficiency, and the influence of interaction between these three factors were not obvious. Possibly most important, we clarified an optimum stimulation effect for higher NGH conversion efficiency under different accumulation conditions, especially in low-permeability and high-saturation, which corresponding stimulation effect were different.

Subject Areas

natural gas hydrate; reservoir stimulation technique; variance analysis; conversion efficiency; sensitivity analysis; numerical simulation

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