Analysis of Pressure and Production Transient Characteristics of Composite Reservoir with Moving Boundary

Sun, Zheng; Yang, Xu-Gang; Jin, Yanxin; Shi, Shengbao; Wu, Minglu

doi:10.3390/en13010034

Cited by 3 publications

(2 citation statements)

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“…Many scholars have conducted multiple studies on composite gas reservoirs with different physical properties [5][6][7][8][9]. Among them, Meng et al [10] believed that the matrix interaction, pores and fractures can be described by a three-porosity model.…”

Section: Introductionmentioning

confidence: 99%

“…K nhi represents the initial horizontal permeability of the gas reservoir. K nvi represents vertical initial permeability (n = 1,2, where 1 represents the internal zone, 2 represents the external zone, h represents the horizontal direction, and v represents the vertical direction);(6) The fluid conforms to Darcy's law in the internal zone. The fluid considers non-Darcy flow and reservoir stress sensitivity in the external zone.…”

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confidence: 99%

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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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