Interpretation of Multiple Hydraulically Fractured Horizontal Wells in Closed Systems

Zerzar, Aissa; Bettam, Youcef

doi:10.2118/2004-027

Cited by 18 publications

(6 citation statements)

References 4 publications

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“…To the best of our knowledge, few publications have discussed the pressure behavior of multiple finite-conductivity fractures in CBM reservoirs. In order to validate the new model, we compared our solution with that reported by Zerar [19] for finite conductivity fracture in a homogeneous reservoir (f(s) = s). It is shown that our solutions excellently match with Zerar's solutions before the boundary is felt (Figure 3).…”

Section: Model Validationmentioning

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%

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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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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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Section: Model Validationmentioning

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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“…In recent years, tight sandstone reservoirs have been discovered as unconventional oil and gas resources with great potential, and hydraulic fracturing technology has been very critical for improving the well productivity of this kind of reservoir [1][2][3][4]. The hydraulic fracture can be inclined if the least principal stress is not perpendicular or parallel to the formation plane [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A Semianalytical Model for Simulating Fluid Flow in Tight Sandstone Reservoirs with a Bottom Aquifer

Wang¹,

Bai²,

Xu³

et al. 2021

Geofluids

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Water breaks through along fractures is a major concern in tight sandstone reservoirs with a bottom aquifer. Analytical models fail to handle the three-dimensional two-phase flow problem for partially penetrating inclined fractures, so time-consuming numerical simulation are often used for this problem. This paper presents an efficient semianalytical model for this problem considering three-dimensional fractures and two-phase flow. In the model, the hydraulic fracture is handled discretely with a numerical discrete method. The three-dimensional volumetric source function in real space and superposition principle are employed to solve the model analytically for fluid flow in the reservoir. The transient flow equations for flow in three-dimensional inclined fractures are solved by the finite difference method numerically, in which two-phase flow and stress-dependent properties are considered. The eventual solution of the model and transient responses are obtained by coupling the model for flow in the reservoir and discrete fracture dynamically. The validation of the semianalytical model is demonstrated in comparison to the solution of the commercial reservoir simulator Eclipse. Based on the proposed model, the effects of some critical parameters on the characteristics of water and oil flow performances are analyzed. The results show that the fracture conductivity, fracture permeability modulus, inclination angle of fractures, aquifer size, perforation location, and wellbore pressure drop significantly affect production rate and water breakthrough time. Lower fracture conductivity and larger inclination angle can delay the water breakthrough time and enhance the production rate, but the increment tends to decline gradually. Furthermore, water breakthrough will occur earlier if the wellbore pressure drop and aquifer size are larger. Besides, the stress sensitivity and perforation location can delay the water breakthrough time.

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“…They showed that four flow regimes can be observed; the early linear, transient, late linear, and late time radial flow. Zerzar et al (2003) combined the boundary element method and Laplace transformation to present a comprehensive solution for multiple vertical fractures horizontal wells. Seven flow regimes have been noticed; bilinear, first linear, elliptical, radial, pseudo-radial, second linear, and pseudo-steady state.…”

Section: Introductionmentioning

confidence: 99%

Pressure Behavior of Partially Penetrating Multiple Hydraulic Fractures

Al-Rbeawi¹,

Tiab²

2012

EER

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Horizontal wells with multiple hydraulic fractures have become a common occurrence in the oil and gas industry, especially in tight formations. Published models assume that hydraulic fractures are fully penetrating the formations. However, studies have shown that fractures are not always fully penetrating the formations.

This paper introduces a new technique for analyzing the pressure behavior of a horizontal well with multiple vertical and inclined partially penetrating hydraulic fractures. The hydraulic fractures in this model could be longitudinal or transverse, vertical or inclined, symmetrical or asymmetrical. The fractures are propagated in isotropic or anisotropic formations and considered having different dimensions and different spacing. This technique, based on pressure and pressure derivative concept, can be used to calculate various reservoir parameters, including directional permeability, fracture length and percentage of penetration. The study has shown that the pressure behavior of small penetration rate is similar to the horizontal wells without hydraulic fractures.

A type curve matching technique has been applied using the plots of the pressure and pressure derivative curves. A set of type curves, which will be included in the paper, have been generated for the partially penetrating hydraulic fractures associated to the horizontal wells with different penetration rates. A step-by-step procedure for analyzing pressure tests using these type curves is also included in the paper for several numerical examples.

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Interpretation of Multiple Hydraulically Fractured Horizontal Wells in Closed Systems

Cited by 18 publications

References 4 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

A Semianalytical Model for Simulating Fluid Flow in Tight Sandstone Reservoirs with a Bottom Aquifer

Pressure Behavior of Partially Penetrating Multiple Hydraulic Fractures

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