Predicting productivity index of hydraulically fractured formations

Al-Rbeawi, Salam; Tiab, Djebbar

doi:10.1016/j.petrol.2013.11.004

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…Bhattacharya et al [15] extended the UFD method to fractured horizontal wells in low permeability reservoirs and obtained the general correlation between the maximum dimensionless productivity index and optimal fracture conductivity. Based on the instantaneous source solutions, Al Rbeawi and Tiab [16] introduced the pseudo-steadystate productivity index into fractured horizontal wells. Wang and Jia [17] filled the gap in a multistage fractured horizontal well for simultaneously optimizing multiple fractures with different properties.…”

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: Introductionmentioning

confidence: 99%

“…The previous models were established on the assumption of the ideal planar fractures [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In fact, many complex fractures can be formed in tight reservoirs, such as multi-wing fractures, non-planar fractures and reorientation fractures [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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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“…The line-source solution has been widely used for complicated applications of multiple fractured horizontal wells [25][26][27][28]. Slab sources [29][30][31][32][33][34][35] and distributed volumetric sources (DVS) [36][37][38][39][40] have recently been proposed for pressure-transient analysis and productivity prediction. More generally, numerical methods have also been used for well performance evaluation, such as the finite element method (FEM) [41], the extended finite element method (XFEM) [42], the finite difference method (FDM) [43], and the boundary element method (BEM) [44].…”

Section: Introductionmentioning

confidence: 99%

An Analytical Solution of the Pseudosteady State Productivity Index for the Fracture Geometry Optimization of Fractured Wells

Gao

Duan

et al. 2019

Energies

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The pseudosteady state productivity index is very important for evaluating the production from oil and gas wells. It is usually used as an objective function for the optimization of fractured wells. However, there is no analytical solution for it, especially when the proppant number of the fractured well is greater than 0.1. This paper extends the established fitting solution for proppant numbers less than 0.1 by introducing an explicit expression of the shape factor. It also proposes a new asymptotic solution based on the trilinear-flow model for proppant numbers greater than 0.1. The two solutions are combined to evaluate the pseudosteady state productivity index. The evaluation results are verified by the numerical method. The new solution can be directly used for fracture geometry optimization. The optimization results are consistent with those given by the unified fracture design (UFD) method. Using the analytical solution for the pseudosteady state productivity index, optimization results can be obtained for rectangular drainage areas with arbitrary aspect ratios without requiring any interpolation or extrapolation. Moreover, the new solution provides more rigorous optimization results than the UFD method, especially for fractured horizontal wells.

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A productivity prediction method for multi-fractured horizontal wells in tight oil reservoirs considering fracture closure

Gao

Guo

Chen

et al. 2022

J Petrol Explor Prod Technol

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The closure fracture phenomenon increases the complexity of well testing and reduces the accuracy of productivity forecasts when tight oil reservoirs are exploited. However, most existing productivity models tend to ignore this. Therefore, a productivity prediction model for multi-fractured horizontal wells in tight oil reservoirs considering fracture closure has been developed by considering the stress sensitivity in the formation and combining the physical parameters of actual production. The model is solved by the Laplace transform, perturbation transform, Pedrosa transform, and Stehfest numerical inversion. Drawing productivity impact curves and discussing productivity influence factors based on the model results from this study show that the model is reasonable. In the actual production process, the hydraulic fracture parameter values are not as high as possible, and they have a reasonable range of values. The fracture closure pressure has a significant impact on the production of tight oil reservoirs. The higher the fracture closure pressure is, the greater the fracture conductivity decreases sharply, and the larger the proppant elastic modulus is, the stronger the fracture conductivity. The influence of fracture conductivity on the production in tight oil reservoirs has an obvious point, and when the value is less than the point, the production effect is good. Improved production can be achieved by balancing the relationship between fracture parameters. The findings of this study can help to better understand the influence of fracture parameters on productivity and contribute to increasing well production and improved development of tight oil reservoirs.

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Predicting productivity index of hydraulically fractured formations

Cited by 7 publications

References 12 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

An Analytical Solution of the Pseudosteady State Productivity Index for the Fracture Geometry Optimization of Fractured Wells

A productivity prediction method for multi-fractured horizontal wells in tight oil reservoirs considering fracture closure

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