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Energies 2017, 10(8), 1241; doi:10.3390/en10081241

Simulation Study on the Effect of Fracturing Technology on the Production Efficiency of Natural Gas Hydrate

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1,2,* , 1,2,* , 1,2
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1
Engineering College, Jilin University, Changchun 130026, China
2
Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun 130026, China
*
Authors to whom correspondence should be addressed.
Received: 14 July 2017 / Revised: 15 August 2017 / Accepted: 16 August 2017 / Published: 21 August 2017
(This article belongs to the Section Energy Sources)
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Abstract

Natural gas hydrate (NGH) concentrations hold large reserves of relatively pure unconventional natural gases, consisting mainly of methane. Depressurization is emerging as the optimum conversion technology for converting NGH in its reservoir to its constituent water and natural gas. NGH concentrations commonly have a pore fill of over 80%, which means that NGH is a low-permeability reservoir, as NGH has displaced water in terms of porosity. Fracturing technology (fracking) is a technology employed for increasing permeability-dependent production, and has been proven in conventional and tight oil and gas reservoirs. In this work, we carried out numerical simulations to investigate the effects on depressurization efficiency of a variably-fractured NGH reservoir, to make a first order assessment of fracking efficiency. We performed calculations for the variations in original NGH saturation, pressure distribution, CH4 gas production rate, and cumulative production under different fracturing conditions. Our results show that the rate of the pressure drop within the NGH-saturated host strata increases with increased fracturing. The CH4 gas production rate and cumulative production are greatly improved with fracturing. Crack quantity and spacing per volume have a significant effect on the improvement of NGH conversion efficiencies. Possibly most important, we identified an optimum fracking value beyond which further fracking is not required. View Full-Text
Keywords: natural gas hydrate; fracturing technology; numerical simulation; production efficiency natural gas hydrate; fracturing technology; numerical simulation; production efficiency
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Chen, C.; Yang, L.; Jia, R.; Sun, Y.; Guo, W.; Chen, Y.; Li, X. Simulation Study on the Effect of Fracturing Technology on the Production Efficiency of Natural Gas Hydrate. Energies 2017, 10, 1241.

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