Productivity characteristics and controlling factors of coalbed methane vertical well in a coal block of Qinshui Basin

Chen, Fengjie; Wu, Caifang; Huo, Zhanbo; Zhao, Qingzhen

doi:10.1177/01445987231219766

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…The Fanzhuang Block is the main development area, which has been in large-scale production since 2006, with over 1500 producing wells [6,7]. Among them, there are 463 low-production vertical wells with a daily output of less than 500 m 3 /d and 44 low-production horizontal wells with a daily output of less than 2000 m 3 /d [8,9]. The Zhengzhuang Block, developed in 2011, is located in the southern part of the Qingshui Basin, with complex coal geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Research on the Multiscale Microscopic Pore Structure of a Coalbed Methane Reservoir

Lu,

Liu,

Zhou

et al. 2024

Energies

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Coal rock pores are the space in which coalbed gas is stored and flows. Accurately characterizing the pore structure of coalbed gas is the foundation of coalbed gas reserve assessment and production forecasting. Traditional experimental methods are unable to characterize the multi-scale pore structure characteristics of coal rock. In this paper, a multi-scale pore structure characterization method is proposed by coupling various experimental methods, including low-pressure nitrogen gas adsorption experiments, X-ray computed tomography (XCT) imaging technology, and scanning electron microscopy (SEM). Using Zhengzhuang coalbed gas as an example, the micro-pore structure of coalbed gas reservoirs is characterized and depicted from a multi-scale perspective. The results indicate that a single experimental approach can only partially reveal the microstructure of coal rock pores. The combined use of multiple methods can accurately reveal the full-scale microstructure of coal rock pores. The pore structure of the experimental coal rock samples exhibits multi-scale characteristics, with a complex variety of pore types, including inorganic pores, organic pores, and fractures. Organic pores are predominant, with a small number of inorganic pores, and their sizes range from 2 nm to 50 μm. Mineral particles and fractures are observed at both the nanoscale and microscale, exhibiting typical multi-scale characteristics, with quartz being the predominant mineral.

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Section: Introductionmentioning

confidence: 99%

Research on the Multiscale Microscopic Pore Structure of a Coalbed Methane Reservoir

Lu,

Liu,

Zhou

et al. 2024

Energies

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Study on Evaluation of the Virtual Saturated Vapor Pressure Model and Prediction of Adsorbed Gas Content in Deep Coalbed Methane

Peng,

Jia,

Zhang

et al. 2024

Processes

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Accurately predicting the adsorbed gas content in coal reservoirs is crucial for evaluating the gas content in deep coal seams. However, due to the significant variations in temperature and pressure conditions across different coal reservoirs, accurately assessing the adsorbed gas quantity presents challenges. Based on the adsorption potential theory, this paper proposes a prediction model of adsorbed gas that is applicable under various temperature and pressure conditions. The results indicate that the adsorbed gas content in deep coal reservoirs is influenced by a combination of temperature, pressure, and coal rank. The increase in pressure and coal rank enhances the inhibitory effect of temperature on methane adsorption. Meanwhile, there are significant differences in the results obtained from various virtual saturated vapor pressure models. Among them, the Amankwah model theoretically satisfies the uniqueness of the adsorption characteristic curve, with the optimal k values for different coal rank samples ranging between 2 and 9. In terms of predicting the adsorption gas, the performance of the models is ranked as follows: Amankwah model > Antonie model > Astakhov model > Dubinin model > Reid model. The Amankwah model exhibits the smallest average relative error and root mean square error. In addition, as burial depth increases, the influence of the pressure on methane adsorption decreases, while the significance of temperature increases, with the critical depth located around 1600 m. At depths shallower than the critical depth, adsorbed gas tends to preferentially accumulate and form reservoirs, which generally have lower commercial value. At depths deeper than the critical depth, free gas has the potential to form reservoirs. At this stage, gas reservoirs dominated by adsorbed gas start transitioning to those containing free gas. These findings are expected to deepen the understanding of deep coalbed methane and provide a scientific basis for exploration and development in the study area.

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Productivity characteristics and controlling factors of coalbed methane vertical well in a coal block of Qinshui Basin

Cited by 2 publications

References 32 publications

Research on the Multiscale Microscopic Pore Structure of a Coalbed Methane Reservoir

Research on the Multiscale Microscopic Pore Structure of a Coalbed Methane Reservoir

Study on Evaluation of the Virtual Saturated Vapor Pressure Model and Prediction of Adsorbed Gas Content in Deep Coalbed Methane

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