Analysis on geologic conditions affecting the performance of gas production from hydrate deposits

Huang, Li; Zheng, Shuai; Wu, N.; Cheng, Jiawang

doi:10.1016/j.marpetgeo.2016.05.034

Cited by 27 publications

(19 citation statements)

References 25 publications

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“…The orthogonal test method is a kind of method to analyze multi-factor and multi-level influence on system objectives, and was proposed by Fisher A. in 1920 [23,26]. Through very limited combination tests, the method can represent complete tests, thus greatly reducing the workload and obviously improving the computational efficiency.…”

Section: 1the Orthogonal Test Methodsmentioning

confidence: 99%

“…Through very limited combination tests, the method can represent complete tests, thus greatly reducing the workload and obviously improving the computational efficiency. Due to very high efficiency this method has been widely used in science, engineering and business [23]. According to previous studies in this work, we investigated the influence of five conditions on electricity generation: reservoir porosity (φ); reservoir permeability (k); rock heat conductivity (λ); water production rate (q), and; injection temperature (Tinj) [17,19,27]; every condition has four levels, as shown in Table 1.…”

Section: 1the Orthogonal Test Methodsmentioning

confidence: 99%

“…It is a significant amount of work and may not be possible to complete in a limited time. Therefore, it is desirable to obtain a small, but representative, subset of combinations for the simulations [23]. Based on the five factors involving four levels, the corresponding orthogonal arrays are shown in Table 2, and we only need to do 16 trials to determine the relative importance of …”

Section: 1the Orthogonal Test Methodsmentioning

confidence: 99%

“…The orthogonal test method is a kind of approach that can compare every condition and rank the order of relative importance of every condition. This method has been widely used in test design in science, engineering and business [23]. In order to systematically research the conditions affecting the electricity generation of EGS, to compare every condition and rank the order of relative importance of every condition, in this study we investigated the main conditions affecting the electricity generation of EGS and ranked the order of relative importance of every condition with the orthogonal test method based on the geological data at Yangbajing geothermal field.…”

Section: Introductionmentioning

confidence: 99%

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Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Zeng

Tang

et al. 2017

Energies

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Abstract:The main conditions affecting electricity generation performance of an enhanced geothermal system (EGS) include reservoir porosity, reservoir permeability, rock heat conductivity, water production rate and injection temperature. Presently there is lack of systematic research the relative importance of the five aforementioned conditions. The orthogonal test method is a statistical approach to analyze multi-factor and multi-level influence on system performance. In this work, based on the geological data at Yangbajing geothermal field, we analyzed the five conditions affecting the electricity generation performance of EGS, and ranked the relative importance of the five factors. The results show that the order of the relative importance of the conditions on electric power is water production rate > injection temperature > reservoir porosity > rock heat conductivity > reservoir permeability; the order of the relative importance of the conditions on reservoir impedance is reservoir permeability > injection temperature > water production rate > reservoir porosity > rock heat conductivity; the order of the relative importance of the conditions on pump power is water production rate > reservoir permeability > injection temperature > reservoir porosity > rock heat conductivity, and; the order of the relative importance of the conditions on energy efficiency is water production rate > reservoir permeability > reservoir porosity > injection temperature > rock heat conductivity. The construction of an EGS reservoir should be located at a formation with higher reservoir porosity or rock heat conductivity, while the determination of reservoir permeability, water production rate and injection temperature should be based on the comprehensive target.

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Section: 1the Orthogonal Test Methodsmentioning

confidence: 99%

Section: 1the Orthogonal Test Methodsmentioning

confidence: 99%

Section: 1the Orthogonal Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Zeng

Tang

et al. 2017

Energies

Self Cite

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“…They indicated that the hydrate deposit with impermeable boundaries was expected to be the potential gas production target. Huang et al [15] investigated the effects of geologic conditions on the hydrate dissociation and gas production through depressurization. Their results indicated that permeability, porosity, and initial hydrate saturation have significant effects on gas production performance.…”

Section: Introductionmentioning

confidence: 99%

Multiphase Flow Behavior of Layered Methane Hydrate Reservoir Induced by Gas Production

Yuan¹,

Xu²,

Xin³

et al. 2017

Geofluids

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Gas hydrates are expected to be a potential energy resource with extensive distribution in the permafrost and in deep ocean sediments. The marine gas hydrate drilling explorations at the Eastern Nankai Trough of Japan revealed the variable distribution of hydrate deposits. Gas hydrate reservoirs are composed of alternating beds of sand and clay, with various conditions of permeability, porosity, and hydrate saturation. This study looks into the multiphase flow behaviors of layered methane hydrate reservoirs induced by gas production. Firstly, a history matching model by incorporating the available geological data at the test site of the Eastern Nankai Trough, which considers the layered heterogeneous structure of hydrate saturation, permeability, and porosity simultaneously, was constructed to investigate the production characteristics from layered hydrate reservoirs. Based on the validated model, the effects of the placement of production interval on production performance were investigated. The modeling results indicate that the dissociation zone is strongly affected by the vertical reservoir's heterogeneous structure and shows a unique dissociation front. The beneficial production interval scheme should consider the reservoir conditions with high permeability and high hydrate saturation. Consequently, the identification of the favorable hydrate deposits is significantly important to realize commercial production in the future.

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Effect of permeability anisotropy on depressurization‐induced gas production from hydrate reservoirs in the South China Sea

Mao

Sun

Ning

et al. 2020

Energy Science & Engineering

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The permeability anisotropy (ie, horizontal, kr, to vertical, kz, permeability ratio) of gas hydrate reservoirs may be a significant factor that affects hydrate dissociation and gas production. Here, site SH2, a candidate for field testing comprising a clayey silt gas hydrate reservoir in the Shenhu area in the South China Sea, was chosen to investigate the effect of permeability anisotropy on gas production behavior through numerical simulations. The spatial distribution of physical fields (ie, pressure, temperature, and saturation) and the evolution of gas and water recovery are comparatively analyzed. The simulation results show that permeability anisotropy has a significant impact on gas extraction, especially when the horizontal permeability is higher than the vertical one. The sensitivity analyses indicate that permeability anisotropy in both medium‐permeability (10‐100 mD) and low‐permeability (1‐10 mD) sediments are conducive to hydrate dissociation and that a higher horizontal permeability is more favorable for gas production. Comparatively, permeability anisotropy in low‐permeability sediments is not beneficial for improving production efficiency. In addition, our work also suggests that heterogeneous hydrate saturation in a reservoir‐scale model should be employed in future predictions because the gas production potential will be overestimated in a homogeneous reservoir under the same conditions. These findings contribute to a clear understanding of the influence of reservoir properties on gas hydrate dissociation processes and provide a reference for future field trials and commercial production.

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Analysis on geologic conditions affecting the performance of gas production from hydrate deposits

Cited by 27 publications

References 25 publications

Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Multiphase Flow Behavior of Layered Methane Hydrate Reservoir Induced by Gas Production

Effect of permeability anisotropy on depressurization‐induced gas production from hydrate reservoirs in the South China Sea

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