Enhancing hot water flooding in hydrate bearing layers through a novel staged production method

Liu, Yongge; Hou, Jirui; Chen, Zhangxin; Bai, Yajie; Su, Hongsheng; Zhao, Ermeng; Li, Guangming

doi:10.1016/j.energy.2020.119319

Cited by 14 publications

(5 citation statements)

References 32 publications

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“…A combination of depressurization and thermal stimulation produces a synergistic effect and improves the efficiency of extraction when developing hydrate deposits [46]. Heat is introduced by injecting hot water, steam, using microwaves, or electrical heating [47,48,50]. Hot water or steam injection is of interest to researchers.…”

Section: Exploration Extraction and Transportationmentioning

confidence: 99%

Key Areas of Gas Hydrates Study: Review

2022

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Gas hydrates are widespread all over the world. They feature high energy density and are a clean energy source of great potential. The paper considers experimental and theoretical studies on gas hydrates in the following key areas: formation and dissociation, extraction and transportation technologies of natural methane hydrates, and ignition, and combustion. We identified a lack of research in more areas and defined prospects of further development of gas hydrates as a promising strategic resource. One of the immediate problems is that there are no research findings for the effect of sediments and their matrices on hydrate saturation, as well as on gas hydrate formation and dissociation rates. No mathematical models describe the dissociation of gas hydrates under various conditions. There is a lack of research into the renewal and improvement of existing technologies for the easier and cheaper production of gas hydrates and the extraction of natural gas from them. There are no models of gas hydrate ignition taking into account dissociation processes and the self-preservation effect.

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Section: Exploration Extraction and Transportationmentioning

confidence: 99%

Key Areas of Gas Hydrates Study: Review

2022

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“…They concluded that the desired gas production performance can be obtained using a two-point horizontal well system under appropriate pressure reduction and heat injection conditions. Liu et al [34] proposed a production method using one horizontal well and one vertical injection well to improve the performance of hot water stimulation in gas hydrate reservoirs. The results showed that the method successfully shifted the flow of hot water to the undissociated zone with higher gas hydrate saturation and facilitated gas hydrate dissociation.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Gas Production from Class II Gas Hydrate Reservoirs by the Multistage Fractured Horizontal Well

Sun

Li²,

He³

et al. 2023

Energies

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In the two test productions that have been conducted in the hydrate reservoir test development zone in the South China Sea, the gas production capacity of single wells is low and the exploitation difficulty with the cost is too high for commercial demand economically. The low permeability of the hydrate-bearing layer (HBL) acts as the major barrier for pressure propagation during depressurization. Hydraulic fracturing by the combined depressurization is considered a promising hydrate production enhancement technology that can effectively improve the seepage state in the reservoir. In this study, to evaluate the effectiveness of the development methods association with fracturing, we established an idealized Class II hydrate reservoir and studied it using a multi-stage fractured horizontal well to assist in depressurization extraction. In order to evaluate the production enhancement effect of this method, we compared the gas production results of four methods, including single vertical well, vertical fractured well, horizontal well, and multistage fractured horizontal well through numerical simulation. In order to investigate the influence of key fracture parameters on the production enhancement effect, a sensitivity analysis of the production effect of Class II hydrate reservoirs with different fracture spacing, number of fractures, fracture conductivity, and fracture length was conducted, and the results were analyzed in terms of gas production and water production behavior curves as well as physical field evolution over time. The simulation results show that the multi-stage fractured horizontal wells have the best production increase in the comparison of well types. In the analysis of fracture parameters, it can be found that the selection of proper fracture spacing and dimensionless fracture conductivity can lead to a significant increase in gas production.

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“…Zhong et al , combined hydraulic fracturing (HF) with hot water injection and argued that this combined method could profoundly improve the gas production performance with a large well spacing. Liu et al proposed a novel staged production method involving a horizontal production well and a vertical hot water injection well to promote gas recovery from NGH deposits. Vishal et al and Lall et al made a comparison of the effects of thermal injection and huff-and-puff method in a class 3 heterogeneous NGH reservoir.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Evaluation of a New Approach of Seawater Flooding for Offshore Natural Gas Hydrate Exploitation

Chen

Jiang

et al. 2023

Energy Fuels

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In this work, a new approach of seawater flooding was proposed for offshore natural gas hydrate (NGH) exploitation, whose feasibility was numerically evaluated based on a large-scale NGH reservoir situated in the Shenhu Area of the South China Sea. Then, two artificial means of well location rearrangement and hydraulic fracturing, as well as their combination, were proposed to be incorporated with seawater flooding to promote gas production from offshore NGH deposits. Simulation results indicated that seawater flooding had great advantages over depressurization and could substantially promote hydrate dissociation, effectively prevent secondary hydrate formation, and greatly facilitate gas production. Furthermore, a stable gas production period could be achieved for a long duration, which made the most significant contribution to gas production. The two artificial means of well location rearrangement and hydraulic fracturing could both promote hydrate dissociation and enhance gas recovery, but the promotion mechanisms were different. When these two methods were combined, hydrate dissociation in the whole hydrate-bearing layer could be further facilitated, and a favorable gas production rate could be obtained with a low water production and a high gas−water ratio, which demonstrated great superiority of the combined method over these two methods when used alone. Therefore, it is expected that the newly proposed approach of seawater flooding combined with well location rearrangement and hydraulic fracturing can be applied in the future commercial offshore NGH development.

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Enhancing hot water flooding in hydrate bearing layers through a novel staged production method

Cited by 14 publications

References 32 publications

Key Areas of Gas Hydrates Study: Review

Key Areas of Gas Hydrates Study: Review

Enhanced Gas Production from Class II Gas Hydrate Reservoirs by the Multistage Fractured Horizontal Well

Feasibility Evaluation of a New Approach of Seawater Flooding for Offshore Natural Gas Hydrate Exploitation

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