Production Performance Analysis for Multi-Branched Horizontal Wells in Composite Coal Bed Methane Reservoir Considering Stress Sensitivity

Jiang, Rui; Liu, Xiuwei; Cui, Yongzheng; Wang, Xing; Gao, Yue; Mao, Nianyu; Yan, Xinyuan

doi:10.1115/1.4046524

Cited by 12 publications

(3 citation statements)

References 43 publications

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“…With the rapid growth of CBM mining technology, the current mining technologies such as hydraulic fracturing and multibranch horizontal well drainage have become the focus of CBM development. 6 − 8 …”

Section: Introductionmentioning

confidence: 99%

“…According to the research report of Zhu et al, the production of high coal rank coal-bed methane (CBM) has accounted for more than 90% of the total production of CBM in China. , However, due to the complex occurrence conditions of CBM − and the high metamorphic degree and generally low permeability of high-rank coal, it is difficult for its exploration and development to achieve the expected results. With the rapid growth of CBM mining technology, the current mining technologies such as hydraulic fracturing and multibranch horizontal well drainage have become the focus of CBM development. − …”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Porosity and Permeability Change of High-Rank Coal under Cyclic Loading and Unloading

Yang

Liu

et al. 2022

ACS Omega

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It is of great significance to study the evolution law and change characteristics of the porosity and permeability of coal under cyclic disturbance to efficiently exploit coal-bed methane (CBM). In this paper, the GCTS rock mechanics experimental system is applied, the unsteady gas seepage test under cyclic loading and unloading is carried out with high-grade coal samples from Zhijin County, Guizhou Province, as the research object, and the mathematical formula of the dynamic change of porosity during loading and unloading is established. The results show that (1) the porosity and permeability parameters of coal are negatively correlated with confining pressure, and all decrease with the increase in confining pressure; (2) the change rate of the porosity and permeability of bedding coal decreases gradually with the increase in stress, and the porosity and permeability under high stress decrease gradually with the increase in cycle times; (3) during cyclic loading and unloading, the permeability loss ( D k ) of coal mainly occurs in the first loading (>90%), and D k gradually decreases with the increase in cyclic times; (4) under the same test conditions, the evolution law of the porosity and permeability of parallel bedding coal and vertical bedding coal is similar but the stress sensitivity of vertical bedding coal is higher; (5) the circumferential strain of parallel bedding coal is higher than that of vertical bedding coal, and the porosity change and permeability loss show a specific bedding effect; and (6) under the action of cyclic stress, the change of strain–permeability of coal is abnormal after it is destroyed. With the increase in strain before the sample is destroyed, the permeability drops sharply, and after the sample is destroyed, the strain decreases and the permeability never recovers. The research results can provide favorable theoretical guidance and technical support for pressure relief exploitation of coal-bed methane, such as multibranch horizontal wells.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Porosity and Permeability Change of High-Rank Coal under Cyclic Loading and Unloading

Yang

Liu

et al. 2022

ACS Omega

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“…Wei et al (2017) studied the production performance of horizontal wells in composite CBM reservoirs applying transient analysis. Jiang et al [16] applied transient analysis to study the behavior of multi-branched horizontal wells in stress-sensitive two-regions composite CBM reservoirs. As can be seen from the above literature, many researchers have studied the production performance of horizontal wells in CBM reservoirs, but little is related to coal seams with pressure-sensitive permeabilities.…”

Section: Introductionmentioning

confidence: 99%

Pressure Transient Analysis for Horizontal Wells in Coal Bed Methane Reservoirs with Pressure-Sensitive Permeabilities

Sepúlveda¹,

Diaz²,

López³

2021

Preprint

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Coal bed methane (CBM) reservoirs are complex systems whose properties differ from those of conventional reservoirs. Coal seams are dual-porosity systems that comprise the porosities of the matrix and cleat system. Gas in the coal seams can be stored as free gas in the cleat system and as adsorbed gas in the porous medium. The flow mechanisms of the natural gas through the formation include desorption, diffusion, and Darcy’s flow regimes. The permeability of CBM reservoirs is more sensitive to pressure variations than conventional gas reservoirs. To study the flow behavior of CBM reservoirs it is mandatory to use a model that considers their unique characteristics. The objective of this study was to propose a physical and mathematical model of production performance for horizontal wells in CBM reservoirs whose permeability is dependent on pressure. A solution for the model was obtained by applying Pedrosa´s transformation, perturbation theory, Laplace transformation, the point source method, and Sthefest´s algorithm. The solution to this problem was validated with previous work thoroughly. The type curves of the model were built and the pressure transient behavior of the model was analyzed and discussed. The effects of several parameters on pressure behavior were also discussed.

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An analytical model of the initiation pressure for multilayer tree-type hydraulic fracturing in gas-bearing coal seams

Zuo

Peng

Zhou

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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Production Performance Analysis for Multi-Branched Horizontal Wells in Composite Coal Bed Methane Reservoir Considering Stress Sensitivity

Cited by 12 publications

References 43 publications

Experimental Study on the Porosity and Permeability Change of High-Rank Coal under Cyclic Loading and Unloading

Experimental Study on the Porosity and Permeability Change of High-Rank Coal under Cyclic Loading and Unloading

Pressure Transient Analysis for Horizontal Wells in Coal Bed Methane Reservoirs with Pressure-Sensitive Permeabilities

An analytical model of the initiation pressure for multilayer tree-type hydraulic fracturing in gas-bearing coal seams

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