Triple medium physical model of post fracturing high-rank coal reservoir in southern Qinshui Basin

Liu, Shiqi; Sang, Shuxun; Zhu, Qipeng; Zhang, Jie-Fang; Gao, Hefeng; Liu, Huihu; Lin, Lixing

doi:10.1007/s12583-014-0501-z

Cited by 12 publications

(2 citation statements)

References 3 publications

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“…The gas-water relative permeability used in the dynamic model is derived from the Corey equation rather than the measured values [32], resulting in high uncertainty. Analogous with the model setting of the CBM gas field in the Bowen Basin, the high and low Corey equation exponents were defined as 4 and 2 separately for gas and water.…”

Section: Analysis Of Uncertainty In Non-trend Parametersmentioning

confidence: 99%

A New Method for Numerical Simulation of Coalbed Methane Pilot Horizontal Wells—Taking the Bowen Basin C Pilot Area in Australia as an Example

Wang,

Duan,

Zhang

et al. 2024

Processes

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Coalbed methane (CBM) pilot wells typically exhibit a short production period, necessitating evaluation of their estimated ultimate recovery (EUR) through numerical simulation. Utilizing limited geological data from the pilot areas to finish history matching and subsequent production forecasting presents substantial challenges. This paper introduces a comprehensive numerical simulation workflow for CBM pilot wells, encompassing the following steps. Initially, geological parameters are categorized into two groups based on their statistical distribution trends: trend parameters (i.e., gas content, permeability, Langmuir volume, and Langmuir pressure) and non-trend parameters (i.e., fracture porosity, gas–water relative permeability, and rock compressibility). The probability method is employed to ascertain the probable high and low limits for trend parameter distributions, while empirical or analogous methods are applied to define the boundaries for non-trend parameters. Subsequently, the parameter sensitivity analysis is conducted to understand the influence of varying parameters on cumulative gas and water production. Conclusively, experimental design algorithms generate over 100 simulation cases using the identified sensitive parameters, from which the top ten optimal cases are chosen for EUR prediction. This workflow features two technological innovations: (1) considering the most comprehensive set of reservoir parameters for uncertainty and sensitivity analysis, and (2) considering the matching accuracy of both cumulative production and dynamic production trends when selecting optimal matching cases. This approach was successfully implemented in the C pilot area of the Bowen Basin, Australia. In addition, it offers valuable insights for numerical simulation of unconventional natural gases, such as shale gas.

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Section: Analysis Of Uncertainty In Non-trend Parametersmentioning

confidence: 99%

A New Method for Numerical Simulation of Coalbed Methane Pilot Horizontal Wells—Taking the Bowen Basin C Pilot Area in Australia as an Example

Wang,

Duan,

Zhang

et al. 2024

Processes

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“…The coal seam is prepared with pulverized coal, sand, and cement, while the roof and floor are prepared with sand, gypsum, and cement. According to the existing achievements about the ratio of model materials [26,27], for the similar material ratio test scheme of the following five coal briquettes, six groups of the roof and floor were preliminarily determined, and three specimens were made in each group [28]. The prepared specimens were cured for 7 days, and the conventional mechanical properties were tested on the material testing machine [29][30][31].…”

Section: Selection Of Equivalent Materials For Coalmentioning

confidence: 99%

Experimental Study on Crack Extension Rules of Hydraulic Fracturing Based on Simulated Coal Seam Roof and Floor

et al. 2022

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Hydraulic fracturing can increase the fracture of coal seams, improve the permeability in the coal seam, and reduce the risk of coal and gas outburst. Most of the existing experimental specimens are homogeneous, and the influence of the roof and floor on hydraulic fracture expansion is not considered. Therefore, the hydraulic fracturing test of the simulated combination of the coal seam and the roof and floor under different stress conditions was carried out using the self-developed true triaxial coal mine dynamic disaster large-scale simulation test rig. The results show that (1) under the condition of triaxial unequal pressure, the hydraulic fractures are vertical in the coal seam, and the extension direction of hydraulic fractures in the coal seam will be deflected, with the increase of the ratio of the horizontal maximum principal stress to the horizontal minimum principal stress. The angle between the extension direction of the hydraulic fracture and the horizontal maximum principal stress decreases. (2) Under the condition of triaxial equal confining pressure, the extension of hydraulic fractures in the coal seam are random, and the hydraulic fracture will expand along the dominant fracture surface and form a unilateral expansion fracture when a crack is formed. (3) When the pressure in one direction is unloaded under the condition of the triaxial unequal pressure, the hydraulic fractures in the coal seam will reorientate, and the cracks will expand in the direction of the decreased confining pressure, forming almost mutually perpendicular turning cracks.

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Multifractal analysis and evolution rules of micro-fractures in brittle tectonically deformed coals of Yangquan mining area

Jiang

Cheng

et al. 2019

Arab J Geosci

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Triple medium physical model of post fracturing high-rank coal reservoir in southern Qinshui Basin

Cited by 12 publications

References 3 publications

A New Method for Numerical Simulation of Coalbed Methane Pilot Horizontal Wells—Taking the Bowen Basin C Pilot Area in Australia as an Example

A New Method for Numerical Simulation of Coalbed Methane Pilot Horizontal Wells—Taking the Bowen Basin C Pilot Area in Australia as an Example

Experimental Study on Crack Extension Rules of Hydraulic Fracturing Based on Simulated Coal Seam Roof and Floor

Multifractal analysis and evolution rules of micro-fractures in brittle tectonically deformed coals of Yangquan mining area

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