Basic Numerical Study on Recovery System of Methane Hydrate by Air-lift Method

Hamaguchi, Ryoukichi; Yahashi, Hiroki; Matsukuma, Yosuke; Matsushima, Masaki; Kamishima, Naoyuki; Arikawa, Kiwamu; Watabe, Masaharu

doi:10.1299/jsmemecjo.2003.3.0_341

Cited by 1 publication

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“…To verify the effectiveness of this method, we attempted to conduct core experiments using alternative hydrates that can be generated at lower pressures than MH. Several alternative hydrates have been used for MH experiments, such as the hydrates of tetrahydrofuran (THF), 1,1-Dichloro-1-fluoroethane (R-141b), Tetra-n-butylammonium bromide (TBAB), and propane (C 3 H 8 ) [7][8][9][10]. In our previous experiments, we applied this grouting method to the artificial cores filled with TBAB hydrate (TH), which could be easily generated in high saturation (up to 100%) with low erosivity to PVC and cast acrylic parts.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Heterogeneity and Anisotropy of the Porous Grout Body Created in the Stabilization of a Methane Hydrate Reservoir through Grouting

Liu,

Kurihara

2024

Methane

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To solve the sand problem during the depressurization of methane hydrate (MH), we proposed a method to build a porous grout body with sufficient permeability and strength around the wellbore through inhibitor pre-injection and grouting, and verified its effectiveness and potential in our previous research using artificial cores created with silica sand and alternative hydrates such as TBAB- hydrate and iso-butane hydrate. However, all of the artificial cores mentioned above were created with high homogeneity, injected, cured, and had their physical properties measured in the vertical direction, which differs from real reservoir conditions. To investigate the effects of grouting in a more realistic fluid flow, we conducted further experiments using horizontal 1D cores, 1D cubic models, and a 2D cross-sectional model mimicking the near wellbore. These experiments revealed that (1) the generated gas somewhat suppressed the effects of grouting as in the case of previous experiments, and (2) grouted reservoirs would be heterogenous and anisotropic due to the fluid densities and the distribution of grout particles and turbidite sediments, but sufficient permeability and satisfactory strength could still be attained. The above series of experiments demonstrated that our method has the potential to effectively produce actual MH, preventing sand problems even in heterogeneous and anisotropic grouted reservoirs.

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Section: Introductionmentioning

confidence: 99%