Different adsorbed gas effects on the reservoir parameters and production in coalbed methane extraction by multibranch horizontal wells

Li, Qixian; Peng, Shoujian; Yan, Fazhi; Zhang, Chaolin; Han, Ende

doi:10.1002/ese3.599

Cited by 10 publications

(5 citation statements)

References 42 publications

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“…Therefore, the anisotropic structure formed by a large number of primary fractures in a natural sample results in a large deviation of the test results. More importantly, the laboratory experiments revealed that a briquette and nature samples have very similar geomechanical properties and permeability behavior under in situ conditions. − The size of a single reservoir specimen was 212 × 380 × 390 mm 3 . Based on the particle size of the specimen, ,, similar materials consisting of coal particles were lowered into specific areas.…”

Section: Methodsmentioning

confidence: 98%

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Dynamic Evolution of the Fluid Effect of Multiple Reservoirs Due to CBM Coproduction: An Experimental Investigation

Peng

Yan

et al. 2020

Energy Fuels

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Coalbed methane (CBM) coproduction in areas with multiple reservoirs has been an important means of improving gas production. The dynamic evolution of the fluid effect is not considered, which is a key factor leading to low production. To study coproduction mechanisms further and understand the evolution of the spatiotemporal characteristics of the dynamic fluid effect, a large-scale vertical well coproduction device was designed and the coproduction process was simulated. The results are as follows: (1) in the early stage of CBM coproduction, a dynamic pressure balance leads to an increase in the reservoir pressure of a low fluid energy reservoir, wherein the pressure rise gradually decreases with the increasing distance of the measurement point from the wellbore. The rate of pressure increase in the low-pressure reservoir is higher than that in the high-pressure reservoir; (2) under the equilibrium effect of dynamic pressure, reversed gas flow would inhibit gas production in the low fluid energy reservoir. The dynamic pressure balance effect has a weak influence on gas production in the relatively high fluid energy reservoir; with an increase in reservoir fluid energy, the effect of gas production inhibition is weakened; (3) in the early stage of CBM coproduction, the reversed gas flow is injected into the low-pressure reservoir. The closer a measurement point is to the wellbore, the greater the deflection angle at that point. Over time, the reversed gas flow caused by interlayer interference on the reservoir is weakened, and the longer the coproduction time, the smaller the influence range of the reversed gas flow.

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Section: Methodsmentioning

confidence: 98%

“…Each reservoir sample was isolated with an interlayer to guarantee airtightness. Through preliminary verification, , the yellow mud material can effectively prevent the cross-flow effect between adjacent coal reservoirs. The arrangement of the reservoir samples in the coal sample chamber is depicted in Figure .…”

Section: Methodsmentioning

confidence: 99%

Dynamic Evolution of the Fluid Effect of Multiple Reservoirs Due to CBM Coproduction: An Experimental Investigation

Peng

Yan

et al. 2020

Energy Fuels

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“…Currently, commonly employed methods for evaluating CBM production capacity include numerical simulation, grey relational analysis, production data analysis, and capacity formula approaches [9,10]. Numerical simulation techniques occupy a prominent position in development effectiveness assessment, with many scholars conducting diversified numerical simulation studies considering various complex factors in different regions [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Geological Modeling of Coal Reservoirs and Analysis of Sensitivity Factors for Combined Mining Capacity

Wang,

Tang,

Yan

et al. 2023

Processes

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Due to the large non-homogeneity of coal reservoirs, there is a large uncertainty about the extent of the impact on coal bed methane production capacity. The Hanchengbei Block has the problems of early exploration, less available production data, and large variations in developed production capacity within a single well group during test production. Therefore, how to use the existing data to analyze the geological factors affecting the development of coalbed methane in the Hanchengbei Block is particularly important. In this paper, based on the coal seam properties and production characteristics of the Hanchengbei Block, a three-dimensional geological model of the area was meticulously constructed using Petrel 2015 modeling software. Through the utilization of stochastic modeling techniques, reservoir attributes were visualized in three dimensions, and probability distribution functions as well as confidence intervals for different geological parameters were derived through geological statistics. Building upon this foundation, a dual-layer geological model incorporating multiple factors was established using Comet3.0 numerical simulation software. Monte Carlo simulation methods were then employed to simulate the effects of various geological parameters on gas production, yielding corresponding simulation results. Through normalization processes, parameter sensitivity was analyzed to determine the primary controlling factors influencing production capacity. The results show that the thickness of the No. 5 coal seam in the Hanchengbei Block is mainly distributed in the range of 1.35–6.89 m; the gas content is 10.28–15.52 m3/t; and the permeability is 0.014–0.048 mD. Under their joint influence, the average gas production of Hanchengbei Block is between 310–720 m3/d. The main factors affecting the capacity of Hanchengbei Block are the thickness and gas content of the coal seam. This study can provide a basis for the subsequent optimization of favorable areas, the formulation of drainage systems, and the design and optimization of development well networks.

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“…Many scholars have carried out research on the disasters and efficiency of CBM exploitation [10][11][12][13][14][15][16][17]. However, since the natural form of CBM molecules is mainly adsorbed on the surface of coal matrix particles or dissociated in the pores of coal-rock mass, or even dissolved in coalbed water, it is difficult to achieve direct and efficient extraction.…”

Section: Introductionmentioning

confidence: 99%

Development and Application of Gas Production Measurement System of Coal-Rock under Temperature–Pressure Coupling

Wang

et al. 2022

Sensors

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In this study, a measurement system for gas generation of coal-rock under temperature–pressure coupling was developed by adding gas extraction, collection, and flow-monitoring devices to the original stainless-steel liquid seepage pipeline of an MTS-815 rock triaxial testing machine, which can be used to study the production mechanism of coalbed methane in a real geological environment. The system has the functions of axial loading, confining pressure loading, continuous heating, gas gathering, etc., and has the advantages of good air tightness, high accuracy and stability, long-term loading and heating, and controllable single variables. The preliminary test for the gas production of anthracite in the Shaanxi Formation of the Qinshui Basin under temperature–pressure coupling was carried out by the developed test system. The results show that the test system can provide accurate and effective measurement means for the study of gas production by coal-rock deformation and is expected to provide effective help for the control and exploitation of coalbed methane.

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Different adsorbed gas effects on the reservoir parameters and production in coalbed methane extraction by multibranch horizontal wells

Cited by 10 publications

References 42 publications

Dynamic Evolution of the Fluid Effect of Multiple Reservoirs Due to CBM Coproduction: An Experimental Investigation

Dynamic Evolution of the Fluid Effect of Multiple Reservoirs Due to CBM Coproduction: An Experimental Investigation

Three-Dimensional Geological Modeling of Coal Reservoirs and Analysis of Sensitivity Factors for Combined Mining Capacity

Development and Application of Gas Production Measurement System of Coal-Rock under Temperature–Pressure Coupling

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