Productivity of multiple fractures in a closed rectangular reservoir

Luo, Wanjing; Wang, Xiaodong; Tang, Changfu; Feng, Yin; Shi, Erxiu

doi:10.1016/j.petrol.2017.07.023

Cited by 16 publications

(12 citation statements)

References 16 publications

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“…In this work, all the reorientation fractures are discretized into a series of minute segments, and all the discrete segments are considered to be uniform-flux [35,36]. By using the superposition principle, the dimensionless pressure in the pseudo-steady period for the ith discrete segment in a closed anisotropic rectangular reservoir can be expressed as [29]:…”

Section: Flow Model In the Anisotropic Reservoirmentioning

confidence: 99%

“…To the best of our knowledge, there is no report on discussion about the productivity index for a horizontal well intercepted by multiple reorientation fractures in an anisotropic reservoir. Luo et al [29] investigated the productivity index of a horizontal well with multiple fractures with azimuth angle, which can be regarded as a special case of our model. Obviously, if principal fracture angle and reoriented fracture angle are equal in our proposed model, reorientation fractures can be reduced to planar fractures, which are exactly the same as that in Luo's model.…”

Section: Model Verificationmentioning

confidence: 99%

“…Generally, the productivity index for a horizontal well with multiple reorientation fractures has not been well investigated. In terms of multi-wing fractures, Luo et al [29] developed a new fracture-wing model to investigate the effect of complex fractures on productivity index and provided an effective approach to calculate the productivity index for multi-wing fractures or non-planar fractures. However, the fracture-wing model has an important assumption that the wellbore must be located at the intersection of two fracture wings.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Fan

Zhao

et al. 2020

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

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Reorientation fractures may be formed in soft and shallow formations during fracturing stimulation and then affect well productivity. The principal focus of this study is on the productivity analysis for a horizontal well with multiple reorientation fractures in an anisotropic reservoir. Combining the nodal analysis technique and fracture-wing method, a semi-analytical model for a horizontal well with multiple finite-conductivity reorientation fractures was established to calculate its dimensionless productivity index and derivative for production evaluation. A classic case in the literature was selected to verify the accuracy of our semi-analytical solution and the verification indicates this new solution is reliable. Results show that for a fixed fracture configuration the dimensionless productivity index of the proposed model first goes up and then remains constant with the increase of fracture conductivity, and optimal fracture conductivity can be determined on derivative curves. Strong permeability anisotropy is a negative factor for well production and the productivity index gradually decreases with the increase of anisotropic factor. As principal fracture angle goes up, horizontal well’s productivity index increases correspondingly. However, the effect of reoriented fracture angle on the productivity index is not as strong as that of principal fracture angle. When reoriented fracture angle is smaller than principal fracture angle, reoriented factor should be as low as possible to achieve optimal productivity index. Meanwhile, well productivity index rises up with the increase of fracture number and fracture spacing, but the horizontal well has optimal reorientation fracture number and fracture spacing to get the economical productivity. Furthermore, the influence of the rotation of one central reorientation fracture on productivity index is weaker than that caused by the rotation of one external reorientation fracture. In addition, the asymmetrical distribution of one or more reorientation fractures slightly affects the productivity index when fracture conductivity is high enough.

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Section: Flow Model In the Anisotropic Reservoirmentioning

confidence: 99%

Section: Model Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Wang

Fan

Zhao

et al. 2020

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

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show abstract

“…Each segment can be considered as a uniform-flux fracture [30]. Therefore, the uniform-flux solution of a fracture located in a closed circular reservoir can be used to calculate the pressure [11].…”

Section: Flow Model Of the Reservoirmentioning

confidence: 99%

“…Luo and Tang [30] derived a wing solution in the discretized form and the pressure of the ith segment, which can be expressed as:…”

Section: Flow Model Of the Fracturementioning

confidence: 99%

A New Pseudo Steady-State Constant for a Vertical Well with Finite-Conductivity Fracture

Cui

et al. 2018

Processes

Self Cite

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Abstract:The Pseudo Steady-State (PSS) constant b Dpss is defined as the difference between the dimensionless wellbore pressure and dimensionless average pressure of a reservoir with a PSS flow regime. As an important parameter, b Dpss has been widely used for decline curve analysis with Type Curves. For a well with a finite-conductivity fracture, b Dpss is independent of time and is a function of the penetration ratio of facture and fracture conductivity. In this study, we develop a new semi-analytical solution for b Dpss calculations using the PSS function of a circular reservoir. Based on the semi-analytical solution, a new conductivity-influence function (CIF) representing the additional pressure drop caused by the effect of fracture conductivity is presented. A normalized conductivity-influence function (NCIF) is also developed to calculate the CIF. Finally, a new approximate solution is proposed to obtain the b Dpss value. This approximate solution is a fast, accurate, and time-saving calculation.

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Productivity Evaluation of Refracturing to a Poorly/Damaged Fractured Well in a Tight Reservoir

Xing

Wang

Zhang³

et al. 2021

Arab J Sci Eng

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Productivity of multiple fractures in a closed rectangular reservoir

Cited by 16 publications

References 16 publications

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

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

A New Pseudo Steady-State Constant for a Vertical Well with Finite-Conductivity Fracture

Productivity Evaluation of Refracturing to a Poorly/Damaged Fractured Well in a Tight Reservoir

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