Productivity analysis for a horizontal well with multiple reorientation fractures in an anisotropic reservoir

Wang, Mingxian; Fan, Zifei; Zhao, L.M.; Xing, Guoqiang; Zhao, Wenqi; Tan, Chengqian

doi:10.2516/ogst/2020078

Cited by 6 publications

(7 citation statements)

References 39 publications

(85 reference statements)

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“…(2) According to the published studies [30], the anisotropy of shale slightly changes principal stress and has little influence on the model accuracy in general. Thus, the formation rock is assumed to be homogeneous, isotropic, and linear elastic porous medium to simplify the calculation and simplify model (3) The influence generated by physicochemical reactions between fracturing fluid and shale is ignored (4) The stress yielded by in situ stress is not affected by the radial borehole (5) The fluid flow in the formation is radial flow and governed by Darcy's law…”

Section: Assumptions and Coordinate Systems In Modelmentioning

confidence: 99%

“…At present, hydraulic fracturing is a key technique that can effectively stimulate well production and has been widely applied around the world [1][2][3]. However, the fracture initiation pressure (FIP) of traditional hydraulic fracturing is relatively high, and the propagation direction of the fracture is generally controlled by in situ stress [4], which often leads to the result that the formed hydraulic fracture fails to extend to the target area of the reservoir.…”

Section: Introductionmentioning

confidence: 99%

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An Analytical Model for Fracture Initiation of Radial Drilling-Fracturing in Shale Formations

et al. 2021

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Radial drilling-fracturing, the combination of radial drilling and hydraulic fracturing, can guide fractures toward the target area and effectively enhance the recovery of the low permeable reservoir. In this paper, based on the stress superposition principle, we establish an analytical model to predict fracture initiation pressure (FIP) and the shale failure mode for radial drilling-fracturing applied in shale formations. In contrast with the former studies, this model can additionally consider the failure from shale beddings and is more applicable in the shale reservoir. The model classifies the shale failure into three modes and, respectively, gives the criterion for each failure mode. Then, a series of sensitivity analyses is conducted by examining effects of various parameters. By analyzing the variation characteristic of the initiation pressures required for three failure modes, the main conclusions are as follows. Firstly, matrix failure and shear failure along bedding tend to take place when the azimuth of radial borehole is moderate. Small and large azimuths are favorable for the occurrence of tensile failure along bedding. Secondly, a high ratio of horizontal in situ stress predisposes shale to generate matrix failure, and bedding tensile failure and bedding shear failure are apt to occur when the ratio of horizontal in situ stress is low. Thirdly, with the increasing intersection angle of the radial borehole wall and bedding plane, the failure mode apt to occur changes from bedding tensile failure to bedding shear failure and then to matrix failure. Fourthly, shale prefers to yield bedding shear failure under a small Biot coefficient and generate the other two failure modes when Biot coefficient is large. Fifthly, permeability coefficient virtually has no influence on the failure mode of shale. The research clarifies the fracture initiation characteristics of radial drilling-fracturing in shale formations and provides a reference for the field application of radial drilling-fracturing.

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Section: Assumptions and Coordinate Systems In Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Analytical Model for Fracture Initiation of Radial Drilling-Fracturing in Shale Formations

et al. 2021

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“…The aim of modeling and simulation of flow in subsurface fractured reservoirs is to enhance the field production. In this special issue, Wang et al [15] established a semi-analytical model for a horizontal well with multiple finite-conductivity reorientation fractures, combining the nodal analysis technique and fracture-wing method, to calculate its dimensionless productivity index and derivative for production evaluation. It was validated in their numerical simulation that the strong permeability anisotropy is a negative factor for well production and the productivity index gradually decreases with the increase of anisotropic factor, which meets the discussion in [9].…”

Section: Accepted: 22 February 2021mentioning

confidence: 99%

Editorial: Advanced modeling and simulation of flow in subsurface reservoirs with fractures and wells for a sustainable industry

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et al. 2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…The dimensionless pressure at any point for a rectangular anisotropic reservoir in the pseudo-steady-state regime can be expressed as [30],…”

Section: Blasingame Rate Decline Solution Based On Semi-analytical Pseudo-steady-state Constantmentioning

confidence: 99%

“…Wu et al [29] developed a semi-analytical model for a vertical well with a single reorientation fracture by the nodal analysis technique to analyze the effects of reorientation fracture properties on its transient pressure. Wang et al [30] established a semi-analytical model for a horizontal well with multiple finite conductivity reorientation fractures to investigate the impacts of fracture reorientation on pseudo-steady-state productivity. Jiang et al [13] formulated a theoretical model to evaluate the production decline performance of a fractured vertical well with reorientated fractures in an anisotropic formation and examined the effect of orientated fractures by generating Agarwal-Gardner-type decline curves.…”

Section: Introductionmentioning

confidence: 99%

Semi-Analytical Rate Decline Solutions for a Refractured Horizontal Well Intercepted by Multiple Reorientation Fractures with Fracture Face Damage in an Anisotropic Tight Reservoir

et al. 2021

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Refracturing treatment is an economical way to improve the productivity of poorly or damaged fractured horizontal wells in tight reservoirs. Fracture reorientation and fracture face damage may occur during refracturing treatment. At present, there is still no report on the rate decline solution for refractured horizontal wells in tight reservoirs. In this work, by taking a semi-analytical method, traditional rate decline and Blasingame-type rate decline solutions were derived for a refractured horizontal well intercepted by multiple reorientation fractures with fracture face damage in an anisotropic tight reservoir. The accuracy and reliability of the traditional rate decline solution were verified and validated by comparing it with a classic case in the literature and a numerical simulation case. The effects of fracture reorientation and fracture face damage on the rate decline were investigated in depth. These investigations demonstrate that fracture face damage is not conducive to increasing well productivity during the early flow period and there is an optimal matching relationship between the principal fracture section angle and permeability anisotropy, particularly for the reservoirs with strong permeability anisotropy. The fracture length ratio and fracture spacing have a weak effect on the production rate and cumulative production while the fracture number shows a strong influence on the rate decline. Furthermore, multifactor sensitivity analysis indicates that fracture conductivity has a more sensitive effect on well productivity than fracture face damage, implying the importance of improving fracture conductivity. Finally, a series of Blasingame-type rate decline curves were presented, and type curve fitting and parameter estimations for a field case were conducted too. This work deepens our understanding of the production performance of refractured horizontal wells, which helps to identify reorientation fracture properties and evaluate post-fracturing performance.

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Productivity analysis for a horizontal well with multiple reorientation fractures in an anisotropic reservoir

Cited by 6 publications

References 39 publications

An Analytical Model for Fracture Initiation of Radial Drilling-Fracturing in Shale Formations

An Analytical Model for Fracture Initiation of Radial Drilling-Fracturing in Shale Formations

Editorial: Advanced modeling and simulation of flow in subsurface reservoirs with fractures and wells for a sustainable industry

Semi-Analytical Rate Decline Solutions for a Refractured Horizontal Well Intercepted by Multiple Reorientation Fractures with Fracture Face Damage in an Anisotropic Tight Reservoir

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