Production performance analysis for horizontal wells in composite coal bed methane reservoir

Zhang, Wei; Jiang, Rui; Xu, Jianchun; Yihua, Gao; Yang, Yibo

doi:10.1177/0144598716687930

Cited by 13 publications

(4 citation statements)

References 37 publications

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“…Predecessors conducted a sensitivity analysis of the nonlinear parameter a, the inclination angle θ, the radius of the internal zone r1D, and the ratio η1,2 of the internal and external zone pressure coefficient [30][31][32].…”

Section: Sensitivity Analysismentioning

confidence: 99%

Well Test Analysis of Inclined Wells in the Low-Permeability Composite Gas Reservoir Considering the Non-Darcy Flow

Zhang²,

Keying³

et al. 2022

Energies

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The application of traditional well test interpretation methods cannot comprehensively consider characteristics of stress sensitivity and non-Darcy flow for low-permeability composite gas reservoirs, which makes it difficult to obtain real reservoir parameters. Based on the micro-mechanism analysis of stress sensitivity and non-Darcy flow in low-permeability gas reservoirs, the flow motion equation was improved. Thus, a mathematical model was established which belongs to the inclined well in the composite gas reservoir with a conventional internal zone and low-permeability external zone. Applying the finite element method to solve the flow model through Matlab programming, the equivalent pressure point was selected to research the pressure distribution of the inclined well. On this basis, the bottom hole pressure dynamic curve was drawn, the flow process was divided into seven stages, and the parameter sensitivity analysis was carried out. Finally, the advanced nature of the new model applied to the interpretation of the well test model is compared by conventional methods. The non-Darcy flow can cause the gradual upward warping of the bottom hole pressure dynamic curve in the later stage, and non-linear enhancement leads to an increase in the upturn through the simulation test. When the inclination angle is greater than 60°, early vertical radial flow and mid-term linear flow gradually appear. A decrease leads to a shorter duration of the pseudo radial flow in the internal zone and the radius of the internal zone. The conduction coefficients ratio of internal and external zones affects the pseudo pressure derivative curve slope in transition phase of pseudo radial flow in the internal and external zones. A comprehensive consideration of the low-permeability composite gas reservoir flow characteristics can improve the fitting degree of the pressure curves. Not only that, but it can also solve the strong diversification of reservoir parameters. Results have a guiding significance for low-permeability composite gas reservoir development and pressure dynamic evaluation in inclined wells.

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Section: Sensitivity Analysismentioning

confidence: 99%

Well Test Analysis of Inclined Wells in the Low-Permeability Composite Gas Reservoir Considering the Non-Darcy Flow

Zhang²,

Keying³

et al. 2022

Energies

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“…The flow equation is highly non-linear. To linearize the gas-flow equation the pseudo-pressure approach [17] and the apparent permeability modulus [18] are defined respectively as = ∫…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The point source method is used to solve the model [17,22]. The solution proposed by Ozkan [22] allows obtaining the pressure distribution in composite reservoirs that comprise an inner region and an outer region whose properties differ.…”

Section: Appendix Bmentioning

confidence: 99%

“…Nie et al [15] used transient analysis to study the flow behavior of a CBM horizontal well and how it is affected by boundary conditions. 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.…”

Section: Introductionmentioning

confidence: 99%

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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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A generalized analytical model for hydrocarbon production using multi-fractured horizontal well with non-uniform permeability distributions

Zhang

2021

International Journal of Hydrogen Energy

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Production performance analysis for horizontal wells in composite coal bed methane reservoir

Cited by 13 publications

References 37 publications

Well Test Analysis of Inclined Wells in the Low-Permeability Composite Gas Reservoir Considering the Non-Darcy Flow

Well Test Analysis of Inclined Wells in the Low-Permeability Composite Gas Reservoir Considering the Non-Darcy Flow

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

A generalized analytical model for hydrocarbon production using multi-fractured horizontal well with non-uniform permeability distributions

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