Improving gas production of hydrate deposits by increasing reservoir permeability nearby production well in the South China Sea

Shen, Pengfei; Sun, Zhongguan; Luo, Yongjiang; Li, Xinwang; Xiao, Chang-Wen

doi:10.1016/j.egyr.2022.03.129

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…For NGH resources in the permafrost region of the Qinghai Tibet Plateau with very low intrinsic permeability, the current research shows that even if the thermal injection method is used to extract the NGH resources, the gas production effect is very poor. Therefore, the most practical method for NGH sediment mining in low-permeability permafrost regions is to increase the permeability of sediments [31]. In previous work, the new combination of fracturing technology and depressurization method was applied to increase the permeability around the production well; the simulation results showed that the increase of the permeability can increase the gas production to 2.1 times with increasing the radius of the fracture zone from 0 to 4 m for 30 years [32].…”

Section: Introductionmentioning

confidence: 99%

Increasing Gas Production of Continuous Freeze-Thaw Hydrate Deposits Based on Local Reservoir Reconstruction

Shen

Mao²,

Cui

et al. 2023

Geofluids

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The fracturing technology for increasing gas production based on hydrate reservoir reconstruction has been proven to have the application prospect of hydrate production. The main content of this work is to study the influence mechanism between multiple production wells after fracturing the reservoirs around horizontal wells. Simulation results indicated that the gas production rates and cumulative volume of released gas by using hydraulic fracturing were both higher than that by using the traditional depressurization method. The average gas-to-water ratio in this work has broken through the technical bottleneck of exploiting hydrate only by the traditional depressurization method. After the rock matrix around the horizontal well was fractured, the permeability of the reservoir in the fracturing area would be increased; thus, the propagation distance of pressure drop would be promoted. In addition, the penetration of the hydrate decomposition area between horizontal production wells was conducive to promoting the flow of decomposed gas and water to production wells. Besides, the hydraulic fracturing method to increase the permeability of the reservoir around the production well is very effective for the gas production of low-permeability natural hydrate deposits. The best distance between production wells was recommended to be 45~60 m, and it was recommended to provide appropriate heat in the area between the two wells to accelerate the decomposition of hydrate.

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Section: Introductionmentioning

confidence: 99%

Increasing Gas Production of Continuous Freeze-Thaw Hydrate Deposits Based on Local Reservoir Reconstruction

Shen

Mao²,

Cui

et al. 2023

Geofluids

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Numerical investigation of production characteristics and interlayer interference during co-production of natural gas hydrate and shallow gas reservoir

Zhao,

Li,

Chen

et al. 2024

Applied Energy

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Experimental Study on Permeability and Gas Production Characteristics of Montmorillonite Hydrate Sediments Considering the Effective Stress and Gas Slippage Effect

Wu,

Gu,

Wang

et al. 2024

SPE Journal

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Summary Gas permeability in hydrate reservoirs is the decisive parameter in determining the gas production efficiency and gas production of hydrate. In the South China Sea (SCS), the gas flow in tight natural gas hydrate (NGH) silty clay reservoirs is significantly affected by the gas slippage effect and the effective stress (ES) of overlying rock. To improve the effectiveness of hydrate exploitation, it is necessary to understand the influence of gas slippage in hydrate reservoirs on the permeability evolution law. For this paper, the gas permeability characteristics and methane production of hydrate montmorillonite sediments were studied at different pore pressures and ESs. Experimental data revealed that the gas permeability of montmorillonite samples before methane hydrate (MH) formation is seriously affected by the Klinkenberg effect. The gas permeability of montmorillonite sediments before hydrate formation is generally smaller than that after hydrate formation, and the gas slippage effect in the sediments after hydrate formation is weaker than that before hydrate formation. With the change in ES, the intrinsic permeability of sediment has a power law relationship with the simple ES. The ES law coefficient n was determined using the response surface method to eliminate the influence of gas slip on gas permeability. As pore pressure decreases and MH decomposes, montmorillonite swelling seriously affects gas permeability. However, the gas slippage effect has a good compensation effect on the permeability of montmorillonite sediments after MH decomposition under low pore pressure. The multistage depressurization-producing process of MH in montmorillonite sediments is mainly 3 MPa depressurization-producing stage and 2 MPa depressurization-producing stage. In this paper, the influence mechanism of gas slippage effect of hydrate reservoir is studied, which is conducive to improving the prediction accuracy of gas content in the process of hydrate exploitation and exploring the best pressure reduction method to increase the gas production of hydrate in the process of exploitation.

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Improving gas production of hydrate deposits by increasing reservoir permeability nearby production well in the South China Sea

Cited by 4 publications

References 35 publications

Increasing Gas Production of Continuous Freeze-Thaw Hydrate Deposits Based on Local Reservoir Reconstruction

Increasing Gas Production of Continuous Freeze-Thaw Hydrate Deposits Based on Local Reservoir Reconstruction

Numerical investigation of production characteristics and interlayer interference during co-production of natural gas hydrate and shallow gas reservoir

Experimental Study on Permeability and Gas Production Characteristics of Montmorillonite Hydrate Sediments Considering the Effective Stress and Gas Slippage Effect

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