Interference Analysis of Methane Co-Production from Two Coal Seams in Southern Qinshui Basin

Quan, Fangkai; Wei, Chongtao; Hao, Shuqing; Ma, Jingsheng; Song, Yu; Lian, Da

doi:10.1007/s11053-022-10043-w

Cited by 12 publications

(1 citation statement)

References 38 publications

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“…36 Quan et al developed a reservoir model to quantify the co-production process of multilayer coal seams and found that aquifers can have a significant impact on co-production. 37 Zhao et al established a numerical model for gas co-production from tight sandstone and coalbed and further discussed the economic benefits of co-production. 38 Similarly, Meng et al developed the numerical model of gas production from coal and tight sandstone reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Impact of Crossflow and Two-Phase Flow on Gas Production from Stacked Deposits

et al. 2023

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The gas production from stacked gas deposits with coalbed, shale, and tight sandstone reservoirs in the coal measure is an effective new technology to enhance per well gas production. However, previously developed numerical models for stacked gas deposits usually target one or two reservoir types. The contribution and impact mechanism of crossflow and two-phase flow on gas production from stacked gas deposits are unclear for the stacked gas deposits with coalbed, shale, and tight sandstone reservoirs in the coal measure. This paper develops a numerical simulation model for the gas production from stacked deposits with shale, coalbed, and tight sandstone reservoirs. This numerical simulation model considers the two-phase flow, gas diffusion in different porosity, pore deformation, and interlayer crossflow. After verification with available data from the literature, this numerical simulation model is used to explore the effects of crossflow across interlayers and two-phase flow on gas transport and production efficiency. The simulation results show that the main sources of gas production from stacked deposits are shale and coalbed reservoirs. The gas in these two reservoirs can be rapidly transported to the wellbore through the tight sandstone reservoir. The gas production from stacked deposits will be underestimated without the interlayer crossflow and overestimated if the two-phase flow is ignored. The gas production efficiency can be effectively improved through the enhancement of the crossflow rate at the interlayer and the decrease of the water saturation in the reservoir.

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Section: Introductionmentioning

confidence: 99%

Impact of Crossflow and Two-Phase Flow on Gas Production from Stacked Deposits

et al. 2023

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Opportunities and challenges for gas coproduction from coal measure gas reservoirs with coal‐shale‐tight sandstone layers: A review

Liang,

Wang,

Leung

et al. 2024

Deep Underground Science and Engineering

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The extraction of coal measure gas has been shifted toward thin gas reservoirs due to the depletion of medium‐thick gas reservoirs. The coproduction of coalbed gas, shale gas, and tight sandstone gas (called a multisuperposed gas system) is a key low‐cost technology for the enhancement of natural gas production from thin gas reservoirs in coal measure. As an emerging engineering exploitation technology at its early stage of development, gas coproduction confronts various engineering challenges in hydraulic fracturing, bottom‐hole pressure regulation, well network arrangement, and extraction sequence. The current understanding of the opportunities and challenges in the gas coproduction from the multisuperposed gas system is not comprehensive enough. In this case, the previous achievements in the field of gas coproduction should be urgently reviewed to provide valuable guidance and recommendations for further development. This review first discusses the regional and spatial distribution characteristics and possible reservoir combinations of gas reservoirs in coal measure. Then, the basic properties of different reservoirs, engineering challenges, and interlayer interference are comparatively analyzed and discussed. The current simulation models for gas coproduction and potential future research directions are further explored. The results indicate that the coupling effects of reservoir heterogeneity, interwell interference, and geological structure for increasing coproduction prediction accuracy should be included in future simulation models for gas coproduction. Careful investigation is required to explore the mechanisms and their further quantifications on the effects of interlayer interference in gas coproduction. The fractal dimension as a scale can play an important role in the characterization of the gas and water transport in different reservoirs. The machine learning methods have tremendous potential to provide accurate and fast predictions for gas coproduction and interlayer interference.

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Reservoir Damage in Coalbed Methane Commingled Drainage Wells and Its Fatal Impact on Well Recovery

Quan

Wei

et al. 2022

Nat Resour Res

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Interference Analysis of Methane Co-Production from Two Coal Seams in Southern Qinshui Basin

Cited by 12 publications

References 38 publications

Impact of Crossflow and Two-Phase Flow on Gas Production from Stacked Deposits

Impact of Crossflow and Two-Phase Flow on Gas Production from Stacked Deposits

Opportunities and challenges for gas coproduction from coal measure gas reservoirs with coal‐shale‐tight sandstone layers: A review

Reservoir Damage in Coalbed Methane Commingled Drainage Wells and Its Fatal Impact on Well Recovery

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