Pressure-Transient Analysis of Multiwing Fractures Connected to a Vertical Wellbore

Luo, Wanjing; Tang, Changfu

doi:10.2118/171556-pa

Cited by 48 publications

(12 citation statements)

References 17 publications

(25 reference statements)

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“…The Equation (5) can be furthermore written in discretized form. Furthermore, the pressure for the i-th segment of w-th wing is satisfied with [11]…”

Section: Fluid Flow In the Fracturementioning

confidence: 99%

“…Transient pressure analysis is a powerful method, and it is usually used for evaluating fracturing process [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Cinco-Ley et al [10] developed the semi-analytical solution to study the transient pressure behavior of a vertical fracture.…”

Section: Introductionmentioning

confidence: 99%

“…They also extended this method in dual porosity reservoirs. Also, many researchers have extended the semi-analytical method to a vertical wellbore with multi-wings [11][12][13], horizontal wells with multiple fractures [14][15][16][17][18][19][20][21][22][23][24]. Xing et al [25] proposed a new model to evaluate the productivity of a well under a pseudo-steady state in an anisotropic reservoir, and found that the optimized well productivity occured when the fractures were perpendicular to the principal permeability.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs

et al. 2020

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Horizontal wells with multi-stage fractures have been widely used to improve coalbed methane (CBM) production from coalbed methane reservoirs. The main focus of this work is to establish a new semi-analytical method in the Laplace domain and investigate the transient pressure behavior in coalbed methane reservoirs. With the new semi-analytical method, flow regimes of a multi-fractured horizontal well in coalbed methane reservoirs were identified. In addition, the sensitivities of fracture conductivity, diffusion model, storability ratio, inter-porosity flow coefficient, adsorption index, fracture spacing, fracture asymmetry, non-planar angle, and wellbore storage were studied. Results indicate that six characteristic flow regimes can be identified for multi-fractured horizontal wells in coalbed methane reservoirs, which are bilinear flow, first linear flow, desorption-diffusion flow, first pseudo-radial flow, second linear flow, and second pseudo-radial flow. Furthermore, the sensitivity analysis shows that the early flow is mainly determined by the fracture conductivity, the asymmetry factor, the non-planar angle, and the wellbore storage; while the desorption-diffusion flow regime is mainly influenced by the diffusion model, the storability ratio, the inter-porosity flow coefficient, the adsorption index, and the fracture spacing. Our work can provide a deep insight into the fluid flow mechanism of multi-fractured horizontal wells in coalbed methane reservoirs.

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“…The Equation (5) can be furthermore written in discretized form. Furthermore, the pressure for the i-th segment of w-th wing is satisfied with [11]…”

Section: Fluid Flow In the Fracturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs

et al. 2020

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“…Hydraulic fracturing can increase the productivity of tight porous medium. There are many solutions, including the analytical type, semi-analytical type, and numerical type, to investigate the flow efficiency of fractured wells in the transient period [13][14][15][16][17][18][19]. However, there are few researches focusing on the pseudo-steady-state problem of fractured wells.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

Xing

Wang

et al. 2019

Energies

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Many oil wells in closed reservoirs continue to produce in the pseudo-steady-state flow regime for a long time. The principal objective of this work is to investigate the characteristics of two key pseudo-steady-state parameters—pseudo-steady-state constant (bDpss) and pseudo-skin factor (S)—for a well penetrated by a fracture with an azimuth angle (θ) in an anisotropic reservoir. Firstly, a general analytical pressure solution for a finite-conductivity fracture with or without an azimuth angle in an anisotropic rectangular reservoir was developed by using the point-source function and spatial integral method, and two typical cases were employed to verify this solution. Secondly, with the asymptotic analysis method, the expressions of pseudo-steady-state constant and pseudo-skin factor were obtained on the basis of their definitions, and the effects of permeability anisotropy, fracture azimuth angle, fracture conductivity and reservoir shape on them were discussed in detail. Results show that all the bDpss-θ and S-θ curves are symmetric around the vertical line, θ = 90° and form a hump or groove shape. The optimized fracture direction in an anisotropic reservoir is perpendicular to the principal permeability axis. Furthermore, a new formula to calculate pseudo-skin factor was successfully proposed based on these two parameters’ relationship. Finally, as an application of pseudo-steady-state constant, a set of Blasingame format rate decline curves for the proposed model were established.

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“…Multi-linear/porosity model is an important alternative tool for simulating production behavior of fractured horizontal well in addition to instantaneous source model (Chen and Raghavan 1997;Zerzar and Bettam 2003;Zhao et al 2014;Wang and Jia 2014;Luo and Tang 2014). Common multi-linear models are list in Fig.…”

Section: Introductionmentioning

confidence: 99%

A Coupled Model for Fractured Shale Reservoirs with Characteristics of Continuum Media and Fractal Geometry

Wei

Wang

et al. 2015

All Days

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The principle focus of this work is on proposing a new model to evaluate the production performance of complexly-fractured well in shale reservoirs for conducting rate transient analysis (RTA) and pressure transient analysis (PTA). The model is established on the trilinear-flow idealization presented by Brown et al. (2009) for fractured horizontal well and associated with continuum geometry, fractal characterization and anomalous diffusion. The coupled model could take into account the non-uniform distribution of fracture network within stimulated reservoir volume (SRV) and property heterogeneity among hydraulic fractures in the configuration of multiple fractured horizontal well (MFHW).The second focus is put on developing a novel semi-analytical solution to fill the gap between trilinear-flow model for single-fracture hypothesis and actual MFHW configuration. The new solution could account for the effect of fracture-production interaction and property heterogeneity among fractures. Calculative results show that the type, sequence and duration of flow regimes are determined by fractal characteristics, associated anomalous diffusion, fracture number/spacing, fracture conductivity, etc. Hence, it is possible to observe the feature of long-period linear flow trends in the production performance of fractured well and explain the presentation of new flow regimes which are generally not identified by conventional trilinear-flow model. In addition, approximate solutions for corresponding flow regimes have also been proposed to interpret the production performance using straight forward method. Furthermore, a field example from Sichuan Shale in China is presented to demonstrate the practical application of the new model for interpreting production data analysis of MFHW. The model provides us with new knowledge and insight into understanding production characteristics and allows us to correctly predict well performance in fractured shale reservoirs

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Pressure-Transient Analysis of Multiwing Fractures Connected to a Vertical Wellbore

Cited by 48 publications

References 17 publications

Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs

Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs

Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

A Coupled Model for Fractured Shale Reservoirs with Characteristics of Continuum Media and Fractal Geometry

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