Comprehensive evaluation of gas production efficiency and reservoir stability of horizontal well with different depressurization methods in low permeability hydrate reservoir

Yin, Faling; Gao, Yonghai; Zhang, Heen; Sun, Baojiang; Chen, Ye; Gao, Dawei; Zhao, Xinxin

doi:10.1016/j.energy.2021.122422

Cited by 20 publications

(5 citation statements)

References 37 publications

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“…Decompression causes stress to concentrate around the wellbore, resulting in significant sediment compression and seafloor subsidence in the area surrounding the vertical well. Additionally, it causes extensive seafloor subsidence in the upper area of the horizontal well [84][85][86]. Seafloor subsidence can affect the stability of facilities such as submarine pipelines and cables, and increase the cost of extraction.…”

Section: Seafloor Subsidencementioning

confidence: 99%

A Review on Submarine Geological Risks and Secondary Disaster Issues during Natural Gas Hydrate Depressurization Production

Ma,

Jiang,

Yan

et al. 2024

JMSE

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The safe and efficient production of marine natural gas hydrates faces the challenges of seabed geological risk issues. Geological risk issues can be categorized from weak to strong threats in four aspects: sand production, wellbore instability, seafloor subsidence, and submarine landslides, with the potential risk of natural gas leakage, and the geological risk problems that can cause secondary disasters dominated by gas eruptions and seawater intrusion. If the gas in a reservoir is not discharged in a smooth and timely manner during production, it can build up inside the formation to form super pore pressure leading to a sudden gas eruption when the overburden is damaged. There is a high risk of overburden destabilization around production wells, and reservoirs are prone to forming a connection with the seafloor resulting in seawater intrusion under osmotic pressure. This paper summarizes the application of field observation, experimental research, and numerical simulation methods in evaluating the stability problem of the seafloor surface. The theoretical model of multi-field coupling can be used to describe and evaluate the seafloor geologic risk issues during depressurization production, and the controlling equations accurately describing the characteristics of the reservoir are the key theoretical basis for evaluating the stability of the seafloor geomechanics. It is necessary to seek a balance between submarine formation stability and reservoir production efficiency in order to assess the optimal production and predict the region of plastic damage in the reservoir. Prediction and assessment allow measures to be taken at fixed points to improve reservoir mechanical stability with the numerical simulation method. Hydrate reservoirs need to be filled with gravel to enhance mechanical strength and permeability, and overburden need to be grouted to reinforce stability.

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Section: Seafloor Subsidencementioning

confidence: 99%

A Review on Submarine Geological Risks and Secondary Disaster Issues during Natural Gas Hydrate Depressurization Production

Ma,

Jiang,

Yan

et al. 2024

JMSE

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“…Li et al 36 found that the production efficiency can be strongly enhanced by using a cycling depressurization scheme because the energy cost per volume of gas production by the cycling scheme can be significantly reduced by compared with regular depressurization. Gao et al 37 evaluated different depressurization schemes using horizontal wells, and the results show that regular depressurization is mainly affected by reservoir sensible heat, stepwise and cycling depressurization are mainly affected by reservoir sensible heat in the early stage, and latent heat plays a role in the later stage.…”

Section: Introductionmentioning

confidence: 99%

Impact of Varied Depressurization Rates on Gas Production and Heat Supply in Hydrate Dissociation

Cheng,

Liu,

et al. 2024

Energy Fuels

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Natural gas hydrate is widely recognized as a promising energy source, with depressurization emerging as the preferred method due to its simplicity and cost-effectiveness. Employing an appropriate depressurization strategy is paramount for maximizing gas production efficiency, especially when faced with constraints in the reservoir heat supply. However, the precise influence of the depressurization rate on the gas production rate and heat supply remains unclear. In this study, we employ a fully coupled thermo-hydro-chemical (THC) model to simulate 60 days of hydrate dissociation using a horizontal well under various depressurization schemes: decelerating depressurization (DD), regular depressurization (RD), and accelerated depressurization (AD). We investigate the effects of dynamic changes in the depressurization rate on gas production, multiphysics response and reservoir heat supply. Our findings indicate that the influence of the depressurization rate on the multiphysics response is most pronounced during the initial depressurization stage. A positive correlation between the gas production rate and the depressurization rate is observed. The amplitude of the gas production rate fluctuations is more significant at higher depressurization rates, and these fluctuations intensify as the depressurization rate increases. From a heat supply perspective, the sensible heat supply ratio increases with the depressurization rate. Gas production is primarily driven by flow dynamics and propelled by sensible heat during depressurization and the early stages of constant pressure. Subsequently, it is controlled by the heat supply and driven by the ambient heat transfer. Therefore, additional heat replenishment can enhance gas production and improve economic viability when sensible heat supply is not predominant. Such findings hold crucial reference value for the commercial exploitation of hydrate resources.

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“…In addition, conglomerate reservoirs are usually dense and have poor reservoir properties. As a result, the development of conglomerate reservoir is difficult, the development cost is high and the economic benefit is low, which restricts the development of conglomerate reservoir [6][7][8]. The development practice of glutenite reservoir shows that low production and poor development effect are common problems in vertical Wells.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Two-Phase Flow in Glutenite Reservoirs for Optimized Deployment in Horizontal Wells

Zhou¹,

Ju²,

Lyu³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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It is known that the pore media characteristics of glutenite reservoirs are different from those of conventional sandstone reservoirs. Low reservoir permeability and naturally developed microfractures make water injection in this kind of reservoir very difficult. In this study, new exploitation methods are explored. Using a real glutenite reservoir as a basis, a three-dimensional fine geological model is elaborated. Then, combining the model with reservoir performance information, and through a historical fitting analysis, the saturation abundance distribution of remaining oil in the reservoir is determined. It is shown that, using this information, predictions can be made about whether the considered reservoir is suitable for horizontal well fracturing or not. The direction, well length, well spacing and productivity of horizontal well are also obtained.

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Comprehensive evaluation of gas production efficiency and reservoir stability of horizontal well with different depressurization methods in low permeability hydrate reservoir

Cited by 20 publications

References 37 publications

A Review on Submarine Geological Risks and Secondary Disaster Issues during Natural Gas Hydrate Depressurization Production

A Review on Submarine Geological Risks and Secondary Disaster Issues during Natural Gas Hydrate Depressurization Production

Impact of Varied Depressurization Rates on Gas Production and Heat Supply in Hydrate Dissociation

Numerical Simulation of Two-Phase Flow in Glutenite Reservoirs for Optimized Deployment in Horizontal Wells

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