Sand production evaluation during gas production from natural gas hydrates

Yan, Cheng; Li, Yang; Cheng, Yuanfang; Wei, Wang; Song, Benbiao; Deng, Fucheng; Feng, Yongcun

doi:10.1016/j.jngse.2018.07.006

Cited by 88 publications

(51 citation statements)

References 32 publications

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“…MH has attracted research interest in a range of engineering and scientific fields, among which are geophysical exploration [14][15][16][17]; environmental impact [7,18,19]; geohazards (e.g., slope stability, dissociation-induced tsunami events, deep-water mud volcanoes) [20][21][22][23]; mechanical property evaluation [24][25][26][27][28]; macro-and micro-mechanical constitutive modeling [29][30][31][32][33][34][35]; thermo-hydro-chemical-mechanical (THCM) formulations for simulation of gas production and the associated difficulties [36][37][38][39][40][41][42][43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

2019

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Past experience of gas production from methane-hydrate-bearing sediments indicates that sand migration is a major factor restricting the production of gas from methane-hydrate reservoirs. One important geotechnical aspect of sand migration is the influence of grain detachment on the existing stresses. This paper focuses on understanding and quantifying the nature of this aspect using different approaches, with a focus on discrete element method (DEM) simulations of sand detachment from hydrate-bearing sand samples. The investigation in the paper reveals that sand migration affects isotropic and deviatoric stresses differently. In addition, the existence of hydrate moderates the magnitude of stress relaxation. Both of these features are currently missing from continuum-based models, and therefore, a new constitutive model for stress relaxation is suggested, incorporating the research findings. Model parameters are suggested based on the DEM simulations. The model is suitable for continuum mechanics-based simulations of gas production from hydrate reservoirs.

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Section: Introductionmentioning

confidence: 99%

Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

2019

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“…The effect of pore pressure on the effective stress of the formation is shown in the following Equation 19 : The stress field causes the rock skeleton to deform and change the seepage characteristics of the stratum.…”

Section: Fluid-solid Coupling Modelmentioning

confidence: 99%

“…At the same time, the change of the seepage field will change the pore pressure distribution of the formation and affect the effective stress of the rock skeleton. The effect of pore pressure on the effective stress of the formation is shown in the following Equation 19 :…”

Section: Fluid-solid Coupling Modelmentioning

confidence: 99%

Wellbore shrinkage during drilling in methane hydrate reservoirs

Yan

Yang

Yan³

et al. 2019

Energy Science & Engineering

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Methane hydrates as a clean and abundant energy source, have attracted the attention of the world. However, the instability of hydrate reservoirs makes it difficult to drill production wells. After drilling, the creep properties of hydrate reservoir would cause wellbore shrinkage, which will affect the drilling safety. This study is to analysis law of wellbore shrinkage after a hydrate well drilled. The results demonstrate that wellbore shrinkage mainly results from plastic deformation and creep deformation. The largest and smallest values are separately found in the directions of the maximum and minimum horizontal in‐situ stress. With the increase of initial in‐situ stress ratio, wellbore shrinkage linearly rise. Under the condition of low horizontal in‐situ stress ratio, wellbore shrinkage is mainly determined by creep deformation. Under the condition of high horizontal in‐situ stress ratio, wellbore shrinkage commonly depends on plastic deformation and creep deformation. With deepening methane hydrate reservoirs, wellbore shrinkage shows a nonlinear increase. For formations with higher hydrate saturation, larger wellbore shrinkage would occur. The research results can provide a theoretical basis for the selection of drilling method while drilling in hydrate formations.

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“…An uneven stress distribution of hydrate-bearing sediments leads to shear deformation of the sediments [17,25]. The increasing pressure drop and production pressure difference leads to a stress concentration around the wellbore conducive to production [26]. However, there is still a difference between numerical simulations and the actual situation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments

et al. 2019

Energies

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Silty-clay reservoirs are a weak point in sand production and sand control studies due to their low economy. However, China’s marine natural gas hydrates (NGH) mostly exist in silty-clay sediments, which restrict the sustainable and efficient development of NGH. In order to study the sand production of hydrate silty-clay sediments, hydrate production experiments in vertical wells and horizontal wells were carried out using a self-developed hydrate sand production and sand control simulation device. The results showed a great difference between the hydrate silty-clay sediments and hydrate sand sediments. The significant differences in production pressure and production temperature between the different layers indicated the low permeability and low heterogeneity of the hydrate silty-clay sediments. The sliding settlement of the overall depression in the horizontal well and overall subsidence in the vertical well of the hydrate silty-clay reservoir would easily lead to silty-clay flow and large-scale sand production. When water rates decreased, the property of “silty-clay sediment filtration and wall building” was found, which formed a “mud cake” around the wellbore. The good strength of adhesion and fracture permeability of the “mud cake” provided ideas for reservoir reformation. This study further discusses sand production and sediment reformation in hydrate silty-clay sediments.

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Sand production evaluation during gas production from natural gas hydrates

Cited by 88 publications

References 32 publications

Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

Wellbore shrinkage during drilling in methane hydrate reservoirs

Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments

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